JP6922569B2 - Identification method and identification device for identifying the types of brushless DC motors and brushless DC motors - Google Patents

Description

The present disclosure relates to a brushless DC motor, an identification method for identifying a type of a brushless DC motor, and an identification device.

Many electronic devices include, for example, a fan motor as a cooling device for releasing heat generated inside to the outside. In electronic devices, the fan motor is electrically connected to the system controller and operates under the control of the system controller.

Patent Document 1 discloses an identification method in which a fan motor and a system controller communicate with each other to acquire fan identification information. For example, switching from the normal mode to the command mode, the fan motor and the system controller send and receive commands via the power supply line, the PWM (Pulse Width Modulation) line, and the TACH (Tachometer) line. The system controller acquires the fan identification information by handshaking and determines the compatibility with the fan motor. In this case, both the system controller and the fan required complicated control software such as switching between the normal mode and the command mode.

U.S. Patent Application Publication No. 2006/0152891

In the above-mentioned conventional technique, a method for more easily identifying the type of brushless DC motor has been desired.

The embodiments of the present disclosure provide an identification method and an identification device for a brushless DC motor capable of identifying the type of the brushless DC motor without particularly performing a handshake.

An exemplary identification method of the present disclosure is an identification method used in an identification device that identifies a type of brushless DC motor, wherein the brushless DC motor has at least one terminal whose output method is an open collector or an open drain. It has an arranged circuit board, the at least one terminal is a first intrinsic resistor electrically connected in series between an open collector or open drain switch element and a pin of the at least one terminal, and said. It has at least one eigenresistance of the second eigenresistance electrically connected in parallel to the switch element, and the at least one eigenresistance is electrically connected to the first eigenresistance and the first eigenresistance. Alternatively, the second intrinsic resistance is connected in parallel, and the first intrinsic resistance and the second intrinsic resistance differ depending on the type of the plurality of brushless DC motors, and the identification device supplies a power supply voltage to the brushless DC motor. Then, a voltage is supplied to the signal line of the at least one terminal of the circuit board via the pull-up resistor in the identification device, and the voltage is set by the at least one natural resistor output from the at least one terminal. This includes inputting the identified identification voltage value into the identification device and identifying the type of the brushless DC motor based on the identification voltage value.

An exemplary identification device of the present disclosure is an identification device that identifies a type of brushless DC motor, and has a circuit board on which at least one terminal whose output method is an open collector or an open drain is arranged, and at least the above. One terminal is a first intrinsic resistor electrically connected in series between an open collector or open drain switch element and a pin of the at least one terminal, and a second electrically connected in parallel to the switch element. It has at least one intrinsic resistor of two intrinsic resistors, and the at least one intrinsic resistor is the first intrinsic resistor and the second intrinsic resistor electrically connected in series or in parallel with the first intrinsic resistor. There, the first resistivity and the second resistivity is different for each type of the plurality of brushless DC motors, and a power supply terminal for supplying a power supply voltage to the brushless DC motor, the circuit board the at least one An input terminal electrically connected to the terminal and having a built-in pull-up resistor and a controller for identifying the type of the brushless DC motor are provided, and the controller is attached to the brushless DC motor via the power supply terminal. The identification voltage value set by the at least one inherent resistor, which is output from the at least one terminal of the circuit board when the power supply voltage is supplied and the pull-up resistor is pulled up, is described as described above. It is acquired via the input terminal and identifies the type of the brushless DC motor based on the identification voltage value.

An exemplary brushless DC motor of the present disclosure comprises a circuit board, at least one terminal arranged on the circuit board and whose output method is an open collector or an open drain, a coil, and a drive circuit for energizing the coil. The at least one terminal is electrically connected to the first intrinsic resistor, which is electrically connected in series between the switch element of the open collector or the open drain and the pin of the at least one terminal, and the switch element. It has at least one intrinsic resistor of the second intrinsic resistor connected in parallel, and the at least one intrinsic resistor is electrically connected in series or in parallel to the first intrinsic resistor and the first intrinsic resistor. It is a second intrinsic resistance, and the first intrinsic resistance and the second intrinsic resistance are different for each type of a plurality of brushless DC motors.

According to an exemplary embodiment of the present disclosure, different intrinsic resistances are mounted on the brushless DC motor for each type of brushless DC motor, and the identification voltage value set by the intrinsic resistance is input to the identification device. This provides a brushless DC motor identification method and an identification device capable of identifying the type of brushless DC motor without performing a handshake.

FIG. 1 is a block diagram schematically showing a typical block configuration example of the user system 100 and the brushless DC motor 200 according to the exemplary embodiment 1. FIG. 2 is a circuit diagram showing a circuit configuration of TACH terminals of the user system 100 and the brushless DC motor 200. FIG. 3 is a block diagram schematically showing another example of the block configuration of the user system 100 and the brushless DC motor 200 according to the exemplary embodiment 1. FIG. 4 is a flowchart of an identification method for identifying the type of brushless DC motor according to the first embodiment. FIG. 5 is a flowchart illustrating a specific processing flow in step S300 for identifying the type of the brushless DC motor 200 based on the identification voltage value. FIG. 6 is a schematic diagram illustrating the contents of the table used for identification. FIG. 7 is a flowchart showing another example of the specific processing flow in step S300 for identifying the type of the brushless DC motor 200 based on the identification voltage value. FIG. 8 is a circuit diagram showing an embodiment of the circuit configuration of the comparator 500. FIG. 9 is a graph showing an output waveform for explaining the operation of the comparator 500. FIG. 10 is a flowchart showing a further specific example of the identification method for identifying the type of the brushless DC motor according to the exemplary embodiment 1. FIG. 11 is a block diagram schematically showing a typical block configuration example of the user system 100, the identification device 100A, and the brushless DC motor 200 according to the second embodiment. FIG. 12 is a block diagram schematically showing another block configuration example of the user system 100, the identification device 100A, and the brushless DC motor 200 according to the second embodiment. FIG. 13 is a circuit diagram showing a circuit configuration of TACH terminals of the user system 100 and the brushless DC motor 200 according to the third embodiment. FIG. 14 is a graph showing an output waveform for explaining the operation of the comparator 500. FIG. 15A is a circuit diagram showing variations in the circuit configuration of the TACH terminal of the user system 100 and the brushless DC motor 200 according to the third embodiment. FIG. 15B is a circuit diagram showing variations in the circuit configuration of the TACH terminal of the user system 100 and the brushless DC motor 200 according to the third embodiment.

Hereinafter, embodiments of an identification method and an identification device for identifying the type of the brushless DC motor of the present disclosure will be described in detail with reference to the accompanying drawings. However, in order to avoid unnecessarily redundant explanations below and facilitate understanding by those skilled in the art, unnecessarily detailed explanations may be omitted. For example, detailed explanations of already well-known matters and duplicate explanations for substantially the same configuration may be omitted.

(Embodiment 1)
[1-1. Configuration example of user system 100 and brushless DC motor 200]
FIG. 1 schematically shows a typical block configuration example of the user system 100 and the brushless DC motor 200. In this specification, the structure and operation of the brushless DC motor 200 will be described by taking a fan motor as an example. The brushless DC motor of the present disclosure includes an inner rotor type or an outer rotor type motor. The brushless DC motor 200 is not limited to a fan motor, but is a brushless DC motor used for various purposes. The brushless DC motor 200 is, for example, a motor used in home appliances such as an air conditioner or a washing machine, and an in-vehicle motor.

The user system 100 is electrically connected to the brushless DC motor 200. The user system 100 can control the brushless DC motor 200. The user system 100 can be installed in a production control system for a brushless DC motor in a factory that produces a wide variety of products. Further, it is a system in an electronic device or an in-vehicle system on which a brushless DC motor 200 can be mounted. For example, the brushless DC motor 200 is suitably mounted on an electronic device such as a server, a main body of a desktop personal computer, or a game machine. For example, when brushless DC motors 200 with different specifications are produced in the same place, the user system 100 is part of a series of inspection systems. Alternatively, when the brushless DC motor 200 is mounted as a fan motor, for example, in the main body of a server or a desktop personal computer, the user system 100 is an entire system composed of various electronic components mounted on a motherboard or. It is a part of it.

The user system 100 includes, for example, a controller 110 and a memory 120. The user system 100 according to the present embodiment has a function of identifying the type of the brushless DC motor 200, as will be described later. In other words, the user system 100 can be used as an identification device for identifying the type of the brushless DC motor 200. Therefore, in this specification, the user system 100 may be referred to as an identification device 100.

The controller 110 can control the entire user system 100 and the brushless DC motor 200. The controller 110 can further identify the type of brushless DC motor 200. The controller 110 is, for example, a semiconductor integrated circuit such as an MCU (micro control unit) or an FPGA (field programmable gate array).

The memory 120 is, for example, a writable memory (eg, PROM), a rewritable memory (eg, a flash memory), or a read-only memory. The memory 120 stores a control program having a group of instructions for causing the controller 110 to control the brushless DC motor 200. The memory 120 further stores a control program having an instruction group for causing the controller 110 to identify the type of the brushless DC motor 200. For example, those control programs are once expanded into RAM (not shown) at boot time. The memory 120 does not need to be externally attached to the controller 110, and may be mounted on the controller 110. The controller 110 equipped with the memory 120 is, for example, the above-mentioned MCU.

The user system 100 includes, for example, a Vmot terminal, a PWM terminal, a TACH terminal, and a GND terminal as control terminals for the brushless DC motor 200. The user system 100 may optionally include a SDATA terminal, an SCLK terminal, a DIRout terminal that controls the rotation direction of the motor, a START / STOP terminal that instructs the start / stop of the rotation of the motor, and the like. In this embodiment, the rotation of the motor means the rotation of the fan motor (or fan).

The Vmot terminal is a terminal for a motor power supply. For example, a power supply voltage of 52V is supplied to the brushless DC motor 200 from the Vmot terminal.

The PWM terminal is an output terminal for controlling the rotation speed of the motor. The controller 110 generates a PMW signal for controlling the rotation of the motor and outputs it to the brushless DC motor 200 via the PWM terminal.

The TACH terminal is an input terminal for a tachometer for monitoring the rotation speed of the motor. The rotation speed is represented by the number of rotations (rpm) at which the motor rotates in a unit time (1 minute) or the number of rotations (rpm) at which the motor rotates in a unit time (1 second). For example, two pulses per revolution of the motor are generally output from the TACH terminal of the fan motor. The pulse signal output from the TACH terminal of the brushless DC motor 200 according to the rotation speed of the motor is input to the TACH terminal of the user system 100.

SDATA pin and SCLK terminal, an input-output terminal for the ^{I 2} C communication. The SDATA terminal and the SCLK terminal are not essential terminals. Serial communication can be performed between the user system 100 and the brushless DC motor 200 via the SDATA terminal and the SCLK terminal.

The brushless DC motor 200 is, for example, a DC fan including an impeller. The brushless DC motor 200 is, for example, an axial fan, a centrifugal fan, a cross flow fan, or a sirocco fan. The brushless DC motor 200 typically includes a regulator 210, a motor drive IC 220, an inverter 230, a circuit board CB on which these electronic components are mounted, a coil 240, and a Hall element 260. For example, a regulator 210, a motor drive IC 220, an inverter 230, and a Hall element 260 form a drive circuit for energizing the coil 240 to drive a motor.

The regulator 210 steps down the motor power supply of, for example, 52 V to generate a power supply voltage Vcc (for example, 5 V) for the motor drive IC 220. However, the regulator 210 is not indispensable, and as will be described later, for example, the power supply voltage Vcc may be supplied from the user system 100 to the brushless DC motor 200 separately from the motor power supply voltage Vmot.

The motor drive IC 220 is connected to the inverter 230. The motor drive IC 220 generates a control signal for controlling the inverter 230 according to the PWM signal transmitted from the user system 100. Motor drive IC220 has SDATA pin and SCLK terminal, it is possible to perform user system 100 and the ^{I 2} C communication.

The motor drive IC 220 monitors the rotation speed of the motor based on, for example, the output from the Hall element 260, and generates a pulse signal according to the rotation speed of the motor. The output method is, for example, 2 pulses per rotation. However, a technique for generating a TACH signal without using a Hall element is known. When using such a technique, the Hall element 260 is not required.

The inverter 230 is electrically connected to the motor drive IC 220 and the motor coil 240. The inverter 230 converts the electric power of the motor power source into the electric power supplied to the fan motor, and energizes the coil 240.

The coil 240 is a winding of the motor.

The brushless DC motor 200 includes, for example, a circuit board CB in which a Vmot terminal, a PWM terminal, a SDATA terminal, an SCLK terminal, a TACH terminal, and a GND terminal corresponding to terminals on the user system 100 side are arranged.

The PWM terminal of the brushless DC motor 200 is an input terminal, and the TACH terminal is an output terminal.

FIG. 2 schematically shows the circuit configuration of the TACH terminal of the user system 100 and the brushless DC motor 200.

The TACH terminal 300 of the user system 100 is an input terminal. The TACH terminal 300 has, for example, a pull-up resistor 310 and a buffer 320. The resistance value Rpu of the pull-up resistor 310 is about a dozen kΩ, for example, 10 kΩ. The pull-up voltage Vreg is, for example, 5V.

The TACH terminal 400 of the brushless DC motor is an output terminal. The output method of the TACH terminal 400 is an open collector or an open drain. The TACH terminal 400 has an open collector or open drain switch element 410 and an inherent resistor 420. The switch element of the open collector is a bipolar transistor, and the switch element of the open drain is a unipolar transistor. FIG. 2 illustrates an open collector switch element 410. An intrinsic resistor 420 is electrically connected in series between the open collector terminal and pin 430.

The intrinsic resistance 420 is a resistance for identifying the brushless DC motor, and is different for each type of the plurality of brushless DC motors. For example, the resistance value Rid of the intrinsic resistance 420 can be assigned to each supplier that manufactures the brushless DC motor. For example, a 2.5 kΩ intrinsic resistor 420 can be assigned to supplier A and a 1.36 kΩ intrinsic resistor 420 can be assigned to supplier B. A unique resistor 420 having a resistance value Rid different from these can be assigned to the supplier C. Further, a unique resistor 420 having a resistance value Rid different from these can be assigned to each of the plurality of suppliers.

As another example, the resistance value Rid of the intrinsic resistance 420 can be assigned to each product lot. For example, a 2.5 kΩ intrinsic resistor 420 can be assigned to the product lot number A and a 1.36 kΩ intrinsic resistor 420 can be assigned to the product lot number B. A unique resistor 420 having a resistance value Rid different from these can be assigned to the product lot number C. Further, a unique resistor 420 having a resistance value Rid different from these can be assigned to each of a plurality of product lot numbers. As described above, there are as many types of brushless DC motors as there are suppliers, or as many product lots as there are managed products.

The voltage level of the output signal output from the TACH terminal 400 of the brushless DC motor 200 is set by the resistance value Rid of the intrinsic resistance 420. In other words, the voltage level is given as a function of the resistance value Rid. When the switch element 410 is turned on with the pull-up resistor 310 having the resistance value Rpu pulled up, the low voltage level output signal Vlow represented by the equation (1) is output. The identification device 100 can identify the type of the brushless DC motor 200 by measuring the output signal Vlow.
Vlow = Vreg × [Rid / (Rpu + Rid)] Equation (1)

FIG. 3 schematically shows another example of the block configuration of the user system 100 and the brushless DC motor 200.

The user system 100 may further include, for example, a plurality of LEDs (Light Emitted Diodes) 130 as light emitting elements. The plurality of LEDs 130 are notification devices for notifying the identification result of the type of the brushless DC motor 200. For example, the plurality of LEDs 130 can be provided as many as the number of types of the plurality of brushless DC motors. For example, if there are two types of brushless DC motors of suppliers A and B, for example, two LEDs having different emission colors can be provided. For example, a red LED for supplier A and a blue LED for supplier B can be used. The user system 100 may further include a comparator 500, which will be described later.

The brushless DC motor 200 may include an MCU 250. By installing the MCU 250, the brushless DC motor 200 can be made intelligent. For example, the MCU 250 can directly control the motor drive IC 220. Further, as described above, the brushless DC motor 200 does not have to include the regulator 210. In that case, for example, the power supply voltage Vcc of the motor drive IC 220 is supplied from the user system 100.

The brushless DC motor 200 may further include a DIRout terminal indicating a rotation direction. The DIRout terminal of the user system 100 is generally an output terminal whose output format is an open collector or an open drain.

[1-2. How to identify the type of brushless DC motor 200]
FIG. 4 illustrates a flowchart of an identification method for identifying the type of brushless DC motor.

The identification method according to the present embodiment is, for example, the method used for the identification device 100. In the process of manufacturing a wide variety of products equipped with a motor, it is generally necessary to identify the type of the brushless DC motor 200 in order to prevent mixing of different types of motors. For example, the identification method of the present disclosure is preferably used as a method for inspecting the compatibility of a brushless DC motor 200 with respect to a user system 100 when manufacturing a product in a factory. For example, the process of inspecting the compatibility of the brushless DC motor 200 is a part of the product manufacturing process.

(Step S100)
First, the identification device 100 supplies the motor power supply voltage Vmot to the brushless DC motor 200 in a state where the terminals of the identification device 100 (user system 100) and the brushless DC motor 200 are electrically connected to each other. Alternatively, in the configuration example shown in FIG. 3, the identification device 100 may supply the power supply voltage Vcc of the motor drive IC 220 to the brushless DC motor 200 together with the motor power supply voltage Vmot. For example, each electronic component in the brushless DC motor 200 performs an initialization operation such as a reset operation when the power is turned on. The initialization operation is completed, and a stable power supply voltage is supplied to the regulator 210, the motor drive IC 220, and the inverter 230.

The pull-up resistor 310 at the TACH terminal 300 of the identification device 100 is pulled up by the pull-up voltage Vreg, and the pull-up voltage Vreg is supplied to the TACH signal line via the pull-up resistor 310. As a result, the voltage level of the TACH signal line becomes a high level when the switch element 410 in the TACH terminal 400 of the brushless DC motor 200 is off.

(Step S200)
The identification voltage value set by the intrinsic resistance, which is output from at least one terminal of the brushless DC motor 200, is input to the identification device 100. In the present embodiment, the identification voltage value set by the intrinsic resistor 420 output from the TACH terminal 400 of the brushless DC motor 200 is input to the identification device 100. The output terminal that outputs the identification voltage value is not limited to the TACH terminal, and may be an output terminal whose output method is an open collector or an open drain.

The brushless DC motor 200 does not output the output signal Vlow from the TACH terminal 400 unless the switch element 410 (see FIG. 3) of the TACH terminal 400 is turned on. Therefore, the identification device 100 (mainly the controller 110) outputs a PWM signal for rotating the motor by two rotations to the motor drive IC 220, for example. The motor drive IC 220 receives the PWM signal and controls the inverter 230 to rotate the motor by two rotations. The identification device 100 can acquire the identification voltage value output when the brushless DC motor 200 is driven.

See FIG. 2 again. The switch element 410 in the TACH terminal 400 is turned on / off by a pulse signal generated by the rotation of the motor. That is, in a state where the pull-up resistor 310 at the TACH terminal 300 of the identification device 100 is pulled up by the pull-up voltage Vreg, the switch element 410 is turned on / off according to the rotation speed of the motor.

When the pulse signal is low level, that is, when the switch element 410 is off, the TACH signal is high level. When the pulse signal reaches a high level, the switch element 410 is turned on, and the output signal Vlow is output from the TACH terminal 400 as an identification voltage value. The output signal Vlow varies among a plurality of brushless DC motor types according to the resistance value Rid of the intrinsic resistance 420. The designer can determine the level of the output signal Vlow in consideration of the product specifications and the like.

As another example, by directly controlling the on / off of the switch element 410, the output signal Vlow can be obtained without rotating the motor. For example, after supplying the power supply voltage to the brushless DC motor 200, an identification period for identifying the type of the brushless DC motor 200 is provided. The MCU 250 (see FIG. 3) generates a signal for switching the switch element 410 at a predetermined duty ratio during the identification period, and forcibly gives the signal to the switch element 410. In other words, the MCU 250 can generate a dummy signal that is the same as the pulse signal generated according to the rotation speed of the motor, and forcibly give the signal to the switch element 410. The identification period can be set to, for example, about several seconds. In this way, the identification device 100 may acquire the output signal Vlow output by forcibly switching the switch element 410 as the identification voltage value. The predetermined duty ratio for switching can be, for example, 50%.

(Step S300)
The identification device 100 receives the output signal Vlow as the identification voltage value. The identification device 100 identifies the type of the brushless DC motor 200 based on the identification voltage value.

FIG. 5 shows an example of a specific processing flow in step S300 for identifying the type of the brushless DC motor 200 based on the identification voltage value.

(Step S310A)
In the example of FIG. 5, the identification device 100 AD-converts the identification voltage to acquire unique information. For example, the controller 110 of the identification device 100 can perform AD conversion. The controller 110 converts the identification voltage, which is an analog signal, into a digital signal. In this specification, the digital signal obtained by AD conversion is referred to as the unique information of the brushless DC motor 200. The resolution of AD conversion is, for example, 10 bits.

(Step S320A)
The controller 110 of the identification device 100 can identify the type of the brushless DC motor 200 to be identified based on the acquired unique information by referring to the table. FIG. 6 illustrates the contents of the table used for identification. The table is a look-up table (LUT) that associates a plurality of brushless DC motor types with unique information of the plurality of brushless DC motors. The table is stored in memory 120, for example. As described above, there are a plurality of types of brushless DC motors for each supplier, for example, and there are three types of suppliers A, B, and C, for example. For example, the type of motor can be represented by, for example, a 3-bit digital signal. Each of the plurality of unique information is expressed as a digital value having the same bit width as the resolution of the AD conversion.

Unique information of the plurality of brushless DC motors is assigned to each type of the plurality of brushless DC motors. When the resistance value Rpu of the pull-up resistor 310 is 10 kΩ and the pull-up voltage Vreg is 5 V, for example, an intrinsic resistor 420 having 2.5 kΩ that can obtain an output signal Vlow of 1.0 V is assigned to the supplier A. Can be done. For example, supplier B can be assigned an intrinsic resistor 420 with 1.36 kΩ to obtain an output signal Vlow of 0.6 V. For example, supplier C can be assigned an intrinsic resistor 420 with 0.87 kΩ to obtain an output signal Vlow of 0.4 V.

Each of the unique information of the plurality of brushless DC motors has a digital value acquired by AD conversion. FIG. 6 illustrates the range and identification of unique information. The unique information acquired by the AD conversion does not overlap among a plurality of brushless DC motor types.

According to the table creation method according to the present embodiment, the type of the brushless DC motor 200 and the unique information can be appropriately associated with each other in the table. As a result, the digital values acquired in the identification of the type of the brushless DC motor 200 can be identified with a range.

As another method for identifying the type of the brushless DC motor 200, there is an identification method using a comparator instead of the AD conversion.

FIG. 7 shows another example of the specific processing flow in step S300 for identifying the type of the brushless DC motor 200 based on the identification voltage value. FIG. 8 schematically shows an embodiment of the circuit configuration of the comparator 500. FIG. 9 shows an output waveform for explaining the operation of the comparator 500.

The comparator 500 includes four detectors 510, 520, 530 and 540. In this example, there are four types of brushless DC motors 200 (for example, suppliers A, B, C and D). For example, detector 510 is for supplier A. The detector 520 is for supplier B. The detector 530 is for supplier C. The detector 540 is for supplier D.

Each detector includes an operational amplifier AMP and resistance elements R1, R2 and R3. For example, the resistance values of the resistance elements R1 and R3 are about 10 kΩ. The power supply voltage V1 of the operational amplifier AMP is, for example, 5V. The pull-up voltage V2 of the resistance element R3 is, for example, 5V. Each detector is preferably a hysteresis comparator.

The resistance value of the resistance element R2 differs among the four detectors 510, 520, 530 and 540. In other words, the resistance value of the resistance element R2 differs for each type of the plurality of brushless DC motors. For example, 3.16 kΩ can be assigned to the resistance value of the resistance element R2 of the detector 510. For example, 1.90 kΩ can be assigned to the resistance value of the resistance element R2 of the detector 520. For example, 1.11 kΩ can be assigned to the resistance value of the resistance element R2 of the detector 530. For example, 0.64 kΩ can be assigned to the resistance value of the resistance element R2 of the detector 540.

By assigning different resistance values to the resistance element R2 among the four detectors 510, 520, 530 and 540, the reference voltage Vref of the operational amplifier AMP can be changed. As a result, it is possible to adjust the voltage input level at which each detector reacts. A plurality of reference voltages are assigned to each type of the plurality of brushless DC motors.

(Step S310B)
The identification voltage value received from the brushless DC motor 200 and a plurality of reference voltages are input to the comparator 500 to obtain a comparison result.

The operational amplifier AMP outputs an output signal OUT according to the magnitude relationship between the input voltage and the reference voltage Vref. When the input voltage is equal to or lower than the reference voltage Vref, the operational amplifier AMP outputs a low-level signal. When the input voltage is larger than the reference voltage Vref, the operational amplifier AMP outputs a high level signal.

(Step S320B)
In this embodiment, the reference voltage Vref4 of the detector 510 is, for example, 1.2V. The reference voltage Vref3 of the detector 520 is, for example, 0.8V. The reference voltage Vref2 of the detector 530 is, for example, 0.5V. The reference voltage Vref1 of the detector 540 is, for example, 0.3V. For example, the detectors 540 and 530 react to the input voltage of 0.6V from the supplier B, and the detectors 510 and 520 do not. A comparison result is obtained in which OUT1 and 2 are at a low level and OUT3 and 4 are at a high level with respect to an input voltage of 0.6 V. The controller 110 can identify the type of supplier B to be identified based on the comparison result. OUT1, 2, 3 and 4 indicate output signals output from the detectors 510, 520, 530 and 540, respectively.

For example, when OUT1, 2 and 3 are low level and OUT4 is high level, the controller 110 can identify the type of supplier C based on the comparison result. For example, when OUT1 is low level and OUT2, 3, 4 are high level, the controller 110 can identify the type of supplier A based on the comparison result. For example, if all of OUT1, 2, 3 and 4 are high level, the controller 110 cannot identify any supplier type based on this comparison result and the brushless DC motor is not connected. Can be identified.

FIG. 10 shows a further specific example of a flowchart of an identification method for identifying the type of the brushless DC motor 200.

As shown in FIG. 10, the identification method according to the present embodiment can further include a step (S400) of notifying the result of identifying the type of the brushless DC motor 200.

As an example of the notification method, it is possible to notify the result of identifying the type of the brushless DC motor 200 by using, for example, the light emitting element shown in FIG. 3, for example, a plurality of LEDs 130. The controller 110 of the identification device 100 identified the type of the brushless DC motor 200 from the LEDs assigned to the brushless DC motor 200 to be identified from among the plurality of LEDs 130 assigned to each type of the plurality of brushless DC motors. Light is emitted based on the result. The light emitting element is not limited to the LED, and may be an element that notifies by light.

For example, a red LED can be assigned for supplier A, a blue LED can be assigned for supplier B, and a green LED can be assigned for supplier C. When the controller 110 of the identification device 100 identifies the brushless DC motor of the supplier C, the controller 110 can emit a green LED. This allows, for example, a factory worker to visually recognize whether or not the brushless DC motor to be identified is a supplier C motor.

For example, by electrically connecting each of the outputs OUT 1, 2, 3 and 4 of the comparator 500 to the LED via the semiconductor switch element of the open collector, the LED is turned on according to the signal level of the output OUT. be able to. For example, the operator can visually identify the type of the brushless DC motor 200 from the combination of the lit LEDs among the plurality of LEDs 130.

As another example, it is possible to notify the result of identifying the type of the brushless DC motor 200 by using a display device (for example, a liquid crystal display) or a speaker. For example, the identification result can be displayed on the liquid crystal display as character information. For example, it is possible to sound the speaker by changing the pitch of the sound for each type of a plurality of brushless DC motors.

As another example, the controller 110 of the identification device 100 may write the identification result to the memory 120 once, or may transmit the identification result to another device or device that requires the identification result. These forms are also examples of notifying the identification result.

According to this embodiment, when the power is turned on to the brushless DC motor 200, for example, the identification voltage value set by the intrinsic resistor 420 is automatically output from the TACH terminal. The identification device 100 only needs to receive the output voltage value for identification. Communication by handshaking between the identification device 100 and the brushless DC motor 200, or mode switching on the brushless DC motor 200 side, as in the conventional case, is not required. In addition, existing terminals can be used, and it is not necessary to newly provide a dedicated terminal for identification.

For example, the brushless DC motor 200 may further include an output terminal whose output method is an open collector or an open drain, in addition to the TACH terminal. For example, another inherent resistor can be mounted on the DIRout terminal shown in FIG. 3 in the same manner as the TACH terminal. The identification voltage value output from the TACH terminal and the DIRout terminal is input to the identification device 100. For example, the identification device 100 can AD-convert two identification voltage values to acquire three unique information, and identify the type of the brushless DC motor 200 based on the combination of the three unique information. When two terminals are used, nine types can be identified. For example, when three terminals are used, 27 types can be identified. In this way, by increasing the number of terminals used for identification, the number of identifiable types can be increased.

The identification method of the present disclosure is suitably used not only at the time of manufacturing a product but also at the time of, for example, replacing a failed brushless DC motor with a new brushless DC motor. It is possible to check whether the replaced brushless DC motor is suitable for the system. Also, for example, individual products equipped with brushless DC motors are connected to the Internet. So-called IoT (Internet of Things) is realized. For example, a supplier of an individual product equipped with a brushless DC motor can identify a product equipped with a specific brushless DC motor by analyzing big data including unique information of the brushless DC motor. As a result, quality can be stabilized by preventing the occurrence of defects.

(Embodiment 2)
FIG. 11 schematically shows a typical block configuration example of the user system 100, the identification device 100A, and the brushless DC motor 200.

The identification device 100A according to the present embodiment is different from the user system 100, unlike the first embodiment. The identification device 100A includes, for example, an MCU 110A and an LED 130. The identification device 100A includes, for example, a Vmot terminal, a GND terminal, and a TACH terminal as terminals necessary for identifying the type of the brushless DC motor 200. The identification device 100A may further include a PWM terminal.

The user system 100, the identification device 100A, and the brushless DC motor 200 are electrically connected to each other between the Vmot terminal, the GND terminal, and the TACH terminal. Therefore, the power supply voltage can be supplied to the brushless DC motor 200 from either the user system 100 or the identification device 100A via the Vmot terminal. The PWM signal can be transmitted from the user system 100 to the brushless DC motor 200.

The identification device 100A may further include a PWM terminal. The MCU 110A of the identification device 100A may generate a PWM signal for rotating the brushless DC motor 200 and give it to the brushless DC motor 200 instead of the user system 100.

The identification voltage value output from the TACH terminal 400 when the power is turned on is input to the TACH terminal of the identification device 100A. For example, the MCU 110A can identify the type of the brushless DC motor 200 based on the acquired identification voltage value according to the processing flow shown in FIG. Further, the MCU 110A may transmit the identification result to the controller 110 of the user system 100.

FIG. 12 schematically shows another block configuration example of the user system 100, the identification device 100A, and the brushless DC motor 200.

The identification device 100A is electrically connected to the user system 100 and the brushless DC motor 200 via, for example, a test point (TP). TP1 is a TP for a motor power supply. TP2 is a TACH signal TP. TP3 is a GND TP. A dedicated probe can be connected to the identification device 100A, and the probe can be applied to the TP to identify the type of the brushless DC motor 200.

(Embodiment 3)
In the first embodiment, the TACH terminal 400 in which the intrinsic resistor 420 for identifying the brushless DC motor is connected in series with the switch element 410 has been described. The present disclosure is not limited to this, and the TACH terminal 400 may have an inherent resistor 421 connected in parallel to the switch element 410.

FIG. 13 schematically shows the circuit configuration of the TACH terminal of the user system 100 and the brushless DC motor 200 according to the present embodiment. Hereinafter, the differences from the TACH terminal 400 according to the first embodiment will be mainly described.

The natural resistor 421 is connected in parallel to the switch element 410. The specific resistor 421 is a resistor for identifying the brushless DC motor as in the first embodiment, and is different for each type of the plurality of brushless DC motors. The resistance value Rid of the intrinsic resistor 421 is larger than the resistance value Rpu of the pull-up resistor 310. For example, the resistance value Rid of the inherent resistance 421 can be assigned to each supplier that manufactures the brushless DC motor. For example, 17.8 kΩ specific resistor 421 is assigned to supplier A, 15.0 kΩ intrinsic resistor 421 is assigned to supplier B, 12.7 kΩ intrinsic resistor 421 is assigned to supplier C, and 10.8 kΩ intrinsic resistor 421 is assigned to supplier. It can be assigned to D. For example, these resistance values Rid of the natural resistance 421 can be used under the condition that the resistance value of the pull-up resistor 310 at the TACH terminal 300 of the identification device 100 is 10 kΩ and the pull-up voltage Vreg is 5 V.

The voltage level of the output signal output from the TACH terminal 400 of the brushless DC motor 200 is set by the resistance value Rid of the natural resistance 421 as in the first embodiment. In other words, the voltage level is given as a function of the resistance value Rid. When the switch element 410 is turned off with the pull-up resistor 310 pulled up, the high voltage level output signal Voh represented by the equation (2) is output. Since the resistance value Rid of the intrinsic resistor 421 is larger than the resistance value Rpu of the pull-up resistor 310, the voltage level of the output signal is relatively high. The identification device 100 can identify the type of the brushless DC motor 200 by measuring the output signal Voh.
Voh = Vreg × [Rid / (Rpu + Rid)] Equation (2)

FIG. 14 shows an output waveform for explaining the operation of the comparator 500. Similar to the detection of the low level identification voltage value described in FIG. 9, for example, the comparator 500 can be used to detect the high level identification voltage value.

For example, 5.1 kΩ can be assigned to the resistance value of the resistance element R1 of the detector 510. For example, 6.1 kΩ can be assigned to the resistance value of the resistance element R1 of the detector 520. For example, 7.2 kΩ can be assigned to the resistance value of the resistance element R1 of the detector 530. For example, 8.5 kΩ can be assigned to the resistance value of the resistance element R1 of the detector 540. As described above, the resistance value of the resistance element R1 is different for each type of the plurality of brushless DC motors. For example, these resistance values of the resistance element R1 can be used under the condition that the resistance value of the resistance element R2 in each of the detectors 510 to 540 of the comparator 500 is 10 kΩ and the pull-up voltage V2 is 5 V.

15A and 15B schematically show variations of the circuit configuration of the TACH terminal of the user system 100 and the brushless DC motor 200 according to the present embodiment.

The TACH terminal 400 according to this variation has two intrinsic resistors 420 and 421. The intrinsic resistance 420 may be referred to as a first intrinsic resistance, and the intrinsic resistance 421 may be referred to as a second intrinsic resistance. The TACH terminal 400 shown in FIG. 15A has an intrinsic resistor 420 connected between the terminal of the open collector and the pin 430, and an intrinsic resistor 421 electrically connected in parallel to the switch element 410 and the intrinsic resistor 420. The TACH terminal 400 shown in FIG. 15B is electrically connected in parallel to the intrinsic resistor 420 connected between the terminal of the open collector and the pin 430 and to the switch element 410, and is electrically connected in series to the intrinsic resistor 420. It has an inherent resistance of 421.

The resistance value Rpu of the pull-up resistor 310 is larger than the resistance value Rid of the intrinsic resistance 420, and the resistance value Rid of the intrinsic resistance 421 is larger than the resistance value Rpu. The resistance value Rid of the intrinsic resistor 421 is the largest among the pull-up resistors 310, the intrinsic resistors 420 and 421.

When the switch element 410 is turned on with the pull-up resistor 310 pulled up, the voltage level of the output signal output from the TACH terminal 400 is a low voltage represented by the equation (1) as described in the first embodiment. It becomes level Low. On the other hand, when the switch element 410 is turned off with the pull-up resistor 310 pulled up, the voltage level of the output signal output from the TACH terminal 400 becomes the high voltage level Voh represented by the equation (2).

According to this variation, the identification device 100 can mean and identify both the output signals Vlow and Voh. From the combination of output signals Vlow and Voh, more types of brushless DC motors 200 can be identified. For example, by assigning four types of resistance values Rid to the natural resistance 420 and assigning four types of resistance values Rid to the natural resistance 421, 16 types of brushless DC motors 200 can be identified.

The outline of one aspect of the present disclosure is as described below.

The identification method according to the exemplary embodiment of the present disclosure is an identification method used for identifying the type of the brushless DC motor 200, for example, the identification device 100. For example, as described with reference to FIGS. 1 and 2, the brushless DC motor 200 has a circuit board CB in which at least one terminal whose output method is an open collector or an open drain, for example, a TACH terminal 400 is arranged. .. At least one terminal is an intrinsic resistor 420 electrically connected in series between an open collector or open drain switch element 410 and a pin 430 of that terminal, and an intrinsic resistor electrically connected in parallel to the switch element 410. It has at least one intrinsic resistance of 421. The intrinsic resistance 420 and the intrinsic resistance 421 are different for each type of the plurality of brushless DC motors. As for the identification method, for example, as described with reference to FIG. 4, a power supply voltage is supplied from the identification device 100 to the brushless DC motor 200, and a pull on the identification device 100 is applied to the signal line of the TACH terminal 400 of the circuit board CB. A voltage Vreg is supplied via an up resistor 310, an identification voltage value set by at least one natural resistor output from the TACH terminal 400 is input to the identification device 100, and a brushless DC is input based on the identification voltage value. Includes identifying the type of motor 200.

According to such an identification method, at least one of the Low level signal and the High level signal output from the TACH terminal 400 of the brushless DC motor 200 is assigned to each of a plurality of brushless DC motor types, thereby supplying the supplier and the product. , Product lot can be identified.

In one embodiment, for example, as described with reference to FIG. 2, at least one intrinsic resistor is the intrinsic resistor 420.

According to such an identification method, the supplier, the product, and the product lot can be identified by assigning the Low level signal output from the TACH terminal 400 of the brushless DC motor 200 to each of a plurality of brushless DC motor types. Become.

In one embodiment, for example, as described with reference to FIG. 13, at least one intrinsic resistor is the intrinsic resistor 421.

According to such an identification method, the supplier, the product, and the product lot can be identified by assigning the high level signal output from the TACH terminal 400 of the brushless DC motor 200 to each of a plurality of brushless DC motor types. Become.

In certain embodiments, at least one intrinsic resistor is electrically connected in series or in parallel to the first intrinsic resistor 420 and the first intrinsic resistor 420, as described, for example, with reference to FIGS. 15A or 15B. The second intrinsic resistor 421.

According to such an identification method, a combination of a Low level signal and a High level signal output from the TACH terminal 400 of the brushless DC motor 200 is assigned to each of a plurality of brushless DC motor types, thereby supplying a supplier, a product, and a product. More identification of lots is possible.

In certain embodiments, the method of identifying the brushless DC motor 200 is further set by at least one intrinsic resistor that drives the brushless DC motor 200 and is output from the TACH terminal 400 as the brushless DC motor 200 is driven. This includes inputting the identification voltage value to the identification device 100 and identifying the type of the brushless DC motor 200 based on the identification voltage value.

According to such an identification method, the identification device 100 can acquire the identification voltage value by issuing a rotation instruction.

In one embodiment, the identification method of the brushless DC motor 200 further switches the switch element 420 of the circuit board CB at a predetermined duty ratio in a predetermined period after starting the supply of the power supply voltage to the brushless DC motor 200. This includes inputting the identification voltage value set by at least one natural resistor output from the TACH terminal 400 into the identification device 100 and identifying the type of the brushless DC motor 200 based on the identification voltage value.

According to such an identification method, the output signal Vlow can be obtained without rotating the motor by directly controlling the on / off of the switch element 410.

In a certain embodiment, in the identification method of the brushless DC motor 200, the identification device 100 acquires the unique information of the brushless DC motor 200 by AD-converting the identification voltage value, and in the identification of the type of the brushless DC motor 200. , The unique information obtained by associating the types of the plurality of brushless DC motors with the unique information of the plurality of brushless DC motors assigned to each type of the plurality of brushless DC motors, for example, referring to the LUT illustrated in FIG. Includes identifying the type of brushless DC motor to be identified based on the information.

According to such an identification method, the controller 110 of the identification device 100 can identify the type of the brushless DC motor 200 to be identified based on the acquired unique information by referring to the table.

In a certain embodiment, each of the unique information of the plurality of brushless DC motors is expressed as a digital value having a predetermined bit width, and is classified by a plurality of digital values within a certain range, and the unique information of the plurality of brushless DC motors. Multiple digital values do not overlap between.

According to such an identification method, each of the unique information of the plurality of brushless DC motors is expressed as, for example, a 10-bit digital value, and is classified by a plurality of digital values within a certain range. Since the plurality of digital values do not overlap among the unique information of the plurality of brushless DC motors, reliable identification can be performed by referring to the table.

In a certain embodiment, the identification method of the brushless DC motor 200 includes, for example, as described with reference to FIGS. 7 to 9, the identification voltage value and a plurality of assigned for each type of the plurality of brushless DC motors. The reference voltage Vref and the reference voltage Vref are input to the comparator 500 to obtain a comparison result, and in the identification of the type of the brushless DC motor 200, the type of the brushless DC motor 200 to be identified is identified based on the comparison result of the comparator 500. Including that.

According to such an identification method, the type of the brushless DC motor 200 to be identified can be identified based on the comparison result of the comparator 500.

In certain embodiments, at least one terminal of the circuit board CB is an output terminal during operation of the brushless DC motor 200, as described, for example, with reference to FIG.

According to such an identification method, various output terminals used as output terminals during the operation of the brushless DC motor 200 can be used.

In one embodiment, at least one terminal of the circuit board CB is a TACH terminal, as described, for example, with reference to FIG.

According to such an identification method, it is possible to identify the type of brushless DC motor having the simplest configuration and having a TACH terminal.

In certain embodiments, at least one terminal of the circuit board CB is a plurality of output terminals, each of which is an open collector or open drain.

According to such an identification method, since the plurality of output terminals are, for example, the TACH terminal 400 and the DIRout terminal as described above, more identification is possible.

In certain embodiments, the method of identifying the brushless DC motor 200 includes notifying the result of identifying the type of brushless DC motor.

According to such an identification method, for example, as described above, the controller 110 of the identification device 100 may write the identification result to the memory 120 once, or send it to another device or device that needs the identification result. You may send it. Further, it is possible to notify the result of identifying the type of the brushless DC motor 200 by using a display device (for example, a liquid crystal display) or a speaker.

In a certain embodiment, the method of identifying the brushless DC motor 200 further comprises a light emitting element assigned to the brushless DC motor 200 to be identified from among a plurality of light emitting elements 130 assigned to each type of the plurality of brushless DC motors. Includes emitting light based on the result of identifying the type of brushless DC motor.

According to such an identification method, for example, a red LED can be assigned to the supplier A, a blue LED can be assigned to the supplier B, and a green LED can be assigned to the supplier C. When the controller 110 of the identification device 100 identifies the brushless DC motor of the supplier C, the controller 110 can emit a green LED.

In certain embodiments, the brushless DC motor 200 is, for example, a DC fan with an impeller.

According to such an identification method, the type of brushless DC motor 200 such as an axial fan, a centrifugal fan, a cross flow fan, or a sirocco fan can be identified.

The identification device 100 according to the exemplary embodiment of the present disclosure is an identification device that identifies the type of the brushless DC motor 200. The identification device 100 has a circuit board CB in which at least one terminal (for example, TACH terminal 400) whose output method is an open collector or an open drain is arranged, as described with reference to FIGS. 1 and 2, for example. At least one terminal is an intrinsic resistor 420 electrically connected in series between an open collector or open drain switch element 410 and a pin 430 of that terminal, and an intrinsic resistor electrically connected in parallel to the switch element 410. It has at least one intrinsic resistance of 421. The intrinsic resistance 420 and the intrinsic resistance 421 are different for each type of the plurality of brushless DC motors. The identification device 100 includes a power supply terminal Vmot for supplying a power supply voltage to the brushless DC motor 200, a TACH terminal 300 electrically connected to the TACH terminal of the circuit board CB, and a pull-up resistor 310, for example, and a brushless. A controller 110 for identifying the type of the DC motor 200 is provided. The controller 110 is at least one output from the TACH terminal 400 of the circuit board CB when the power supply voltage is supplied to the brushless DC motor 200 via the power supply terminal Vmot and the pull-up resistor 310 is pulled up. The identification voltage value set by the natural resistor is acquired via the TACH terminal 300, and the type of the brushless DC motor 200 is identified based on the identification voltage value.

According to such an identification device, at least one of the Low level signal and the High level signal output from the TACH terminal 400 of the brushless DC motor 200 is assigned to each of a plurality of brushless DC motor types, thereby supplying the supplier and the product. , Product lot can be identified.

As described above, the brushless DC motor 200 according to the exemplary embodiment of the present disclosure is arranged on the circuit board CB and the circuit board CB, and the output method is an open collector or an open drain at least one terminal (for example, a TACH terminal). 400), a coil 240, and a drive circuit for energizing the coil 240. At least one terminal is an intrinsic resistor 420 electrically connected in series between an open collector or open drain switch element 410 and a pin 430 of that terminal, and an intrinsic resistor electrically connected in parallel to the switch element 410. It has at least one intrinsic resistance of 421. The intrinsic resistance 420 and the intrinsic resistance 421 are different for each type of the plurality of brushless DC motors. For example, the regulator 210, the motor drive IC 220, the inverter 230, and the Hall element 260 shown in FIG. 1 constitute a drive circuit for energizing the coil 240 to drive the motor.

According to such a brushless DC motor, by assigning at least one of the Low level signal and the High level signal output from the TACH terminal 400 of the brushless DC motor 200 to each of a plurality of brushless DC motor types, the supplier, It is possible to identify products and product lots.

The embodiments of the present disclosure are widely used in various devices including various fan motors, such as personal computers, game machines, vacuum cleaners, dryers, washing machines and refrigerators.

100 user system (identification device)
100A identification device 110 controller 120 memory 130 LED
200 Brushless DC Motor 210 Regulator 220 Motor Drive IC
230 Inverter 240 Coil 250 MCU
260 Hall element 500 comparator

Claims (16)

An identification method used in an identification device that identifies the type of brushless DC motor.
The brushless DC motor has a circuit board in which at least one terminal whose output method is an open collector or an open drain is arranged.
The at least one terminal is electrically connected in parallel to the first intrinsic resistor electrically connected in series between the switch element of the open collector or the open drain and the pin of the at least one terminal, and the switch element. Has at least one eigenresistance of the second eigenresistance and
The at least one intrinsic resistor is the first intrinsic resistor and the second intrinsic resistor electrically connected in series or in parallel to the first intrinsic resistor.
The first intrinsic resistance and the second intrinsic resistance differ depending on the type of the plurality of brushless DC motors.
A power supply voltage is supplied from the identification device to the brushless DC motor,
A voltage is supplied to the signal line of the at least one terminal of the circuit board through the pull-up resistor in the identification device.
The identification voltage value set by the at least one natural resistor output from the at least one terminal is input to the identification device, and the identification voltage value is input to the identification device.
An identification method for identifying the type of the brushless DC motor based on the identification voltage value. The identification method according to claim 1, wherein the at least one intrinsic resistance is the first intrinsic resistance. The identification method according to claim 1, wherein the at least one intrinsic resistance is the second intrinsic resistance. The identification method according to any one of claims 1 to 3.
Further, the brushless DC motor is driven to drive the brushless DC motor.
Along with the drive of the brushless DC motor, the identification voltage value set by the at least one natural resistor output from the at least one terminal is input to the identification device.
The type of the brushless DC motor is identified based on the identification voltage value. The identification method according to any one of claims 1 to 3.
Further, in a predetermined period after starting the supply of the power supply voltage to the brushless DC motor, the switch element of the circuit board is switched at a predetermined duty ratio.
The identification voltage value set by the at least one natural resistor output from the at least one terminal is input to the identification device, and the identification voltage value is input to the identification device.
The type of the brushless DC motor is identified based on the identification voltage value. The identification method according to any one of claims 1 to 5.
The identification device acquires the unique information of the brushless DC motor by AD-converting the identification voltage value.
In identifying the types of brushless DC motors, refer to a table that associates the types of the plurality of brushless DC motors with the unique information of the plurality of brushless DC motors assigned to each type of the plurality of brushless DC motors. Then, the type of the brushless DC motor to be identified is identified based on the acquired unique information. The identification method according to claim 6.
Each of the unique information of the plurality of brushless DC motors is expressed as a digital value having a predetermined bit width, and is classified by a plurality of digital values within a certain range. The plurality of digital values do not overlap between them. The identification method according to any one of claims 1 to 5.
The identification voltage value and the plurality of reference voltages assigned to each type of the plurality of brushless DC motors are input to the comparator to obtain a comparison result.
In the identification of the type of the brushless DC motor, the type of the brushless DC motor to be identified is identified based on the comparison result of the comparator. The identification method according to any one of claims 1 to 8.
The at least one terminal of the circuit board is a terminal used as an output terminal during the operation of the brushless DC motor. The identification method according to claim 9.
The at least one terminal of the circuit board is a tachometer terminal. The identification method according to any one of claims 1 to 8.
The at least one terminal of the circuit board is a plurality of output terminals in which each output method is an open collector or an open drain. The identification method according to any one of claims 1 to 11.
Further, the identification device notifies the result of identifying the type of the brushless DC motor. The identification method according to any one of claims 1 to 11.
Further, the light emitting element assigned to the brushless DC motor to be identified is selected from the plurality of light emitting elements assigned to each type of the plurality of brushless DC motors based on the result of identifying the type of the brushless DC motor. To emit light. The identification method according to any one of claims 1 to 13.
The brushless DC motor is a fan motor having an impeller. An identification device that identifies the type of brushless DC motor.
It has a circuit board on which at least one terminal whose output method is open collector or open drain is arranged.
The at least one terminal is electrically connected in parallel to the first intrinsic resistor electrically connected in series between the switch element of the open collector or the open drain and the pin of the at least one terminal, and the switch element. Has at least one eigenresistance of the second eigenresistance and
The at least one intrinsic resistor is the first intrinsic resistor and the second intrinsic resistor electrically connected in series or in parallel to the first intrinsic resistor.
The first intrinsic resistance and the second intrinsic resistance differ depending on the type of the plurality of brushless DC motors.
A power supply terminal for supplying a power supply voltage to the brushless DC motor,
An input terminal electrically connected to the at least one terminal of the circuit board and having a built-in pull-up resistor.
A controller that identifies the type of brushless DC motor,
With
The controller
The power supply voltage is supplied to the brushless DC motor via the power supply terminal, and
When the pull-up resistor is pulled up, the identification voltage value set by the at least one intrinsic resistor output from the at least one terminal of the circuit board is acquired via the input terminal. An identification device that identifies the type of the brushless DC motor based on the identification voltage value. Brushless DC motor
With the circuit board
With at least one terminal arranged on the circuit board and whose output method is open collector or open drain,
With the coil
A drive circuit that energizes the coil and
With
The at least one terminal is electrically connected in parallel to the first intrinsic resistor electrically connected in series between the switch element of the open collector or the open drain and the pin of the at least one terminal, and the switch element. Has at least one eigenresistance of the second eigenresistance and
The at least one intrinsic resistor is the first intrinsic resistor and the second intrinsic resistor electrically connected in series or in parallel to the first intrinsic resistor.
The first intrinsic resistance and the second intrinsic resistance are different for each type of the plurality of brushless DC motors.

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