JP4296690B2 - Motor pulse number conversion circuit - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pulse number conversion circuit for a motor that converts the number of pulses output during one rotation of the motor.
[0002]
[Prior art]
Conventionally, when outputting rotation information of a motor, a pulse signal is generally used. The pulse signal can be easily obtained by taking out the output of the Hall sensor used for the rotation control of the motor as it is outside the motor.
However, the number of pulses per motor rotation is determined by the configuration of the motor. For example, in the case of a 6-pole motor, the number of pulses per motor rotation is 3 pulses.
[0003]
[Problems to be solved by the invention]
However, when the rotation control of the motor and the rotation information detection are combined with one hall sensor, the output (number of pulses) of the hall sensor is determined by the configuration of the motor as described above. For this reason, it is difficult to obtain two pulses from a hall sensor used for rotation control of a 6-pole motor, for example.
Further, even when a hall sensor for detecting rotation information is provided separately from the hall sensor used for controlling the rotation of the motor, it is difficult to convert the number of pulses per rotation of the motor from 3 pulses to 2 pulses, for example. .
The present invention has been made based on the above circumstances, and an object of the present invention is to provide a motor pulse number conversion circuit capable of converting the number of pulses output as motor rotation information.
[0004]
[Means for Solving the Problems]
(Means of Claim 1)
When the number of pulses output from the pulse generating means during one rotation of the motor is m (natural number), the m pulse signals are divided into n equal to one rotation of the motor (natural number, where m> n) a pulse number conversion circuit for converting into a pulse signal,
After dividing the pulse signal output from the pulse generating means to 1 / m, a signal for each next phase (radian) is created based on the divided signal,
0, 2π / n, 2π · 2 / n, ..., 2π · (n-1) / n
The signals for each phase are combined and n pulse signals are output.
Thereby, a pulse signal can be output for each phase divided into n equal to one rotation (2π) of the motor, and m pulse signals can be converted into n pulse signals equally divided.
[0005]
(Means of Claim 2)
The pulse number conversion circuit for a motor according to claim 1,
A frequency dividing circuit for dividing the pulse signal output from the pulse generating means into 1 / m;
A phase circuit that shifts the frequency-divided signal of the frequency-dividing circuit to each of the following phases;
2π / n, 2π · 2 / n, ... 2π · (n-1) / n
And an adder circuit that synthesizes the frequency-divided signal of 0 ° phase divided by the frequency divider circuit and the signal for each phase phase-shifted by the phase circuit.
[0006]
In the frequency dividing circuit, one pulse signal can be obtained by dividing m pulse signals output during one rotation of the motor into 1 / m.
In the phase circuit, 2π / n to 2π · (n−) of each phase obtained by dividing one pulse signal of 0 ° phase divided by the frequency dividing circuit into n equal to one rotation (2π) of the motor. 1) Shift every phase up to / n.
In the adder circuit, one signal divided by the frequency divider circuit and (n−1) signals shifted for each phase by the phase circuit are combined, and so on for one rotation of the motor. Divided n pulse signals can be obtained.
[0007]
(Means of claim 3)
In the motor pulse number conversion circuit according to claim 1 or 2,
The pulse generating means is a magnetic sensor that detects a change in magnetic flux generated according to the rotation of the motor and outputs an electric signal.
In this case, since the output (pulse signal) of a magnetic sensor (for example, Hall sensor) used for motor rotation control can be converted and obtained as motor rotation information, a dedicated magnetic sensor is used to detect the rotation information. There is no need to provide it, and it can cope with low cost.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a schematic diagram of a pulse number conversion circuit 1.
The pulse number conversion circuit 1 inputs a signal (pulse signal) of the magnetic sensor 2 that detects rotation information of the motor, converts the number of pulses per one rotation of the motor into a predetermined number, and outputs it.
The magnetic sensor 2 detects a change in magnetic flux accompanying the rotation of the motor and outputs a pulse signal. For example, a Hall element is used. In the magnetic sensor 2, the number of pulses output during one rotation of the motor is determined by the configuration (number of poles) of the motor. For example, in the case of a 6-pole motor, the number of pulses per rotation is 3 pulses.
[0009]
The pulse number conversion circuit 1 of the present embodiment converts the number of pulses per one rotation of the motor output from the magnetic sensor 2 from m pulses to n pulses. As shown in FIG. The circuit 4 and the adding circuit 5 are configured.
Note that m and n are natural numbers and have a relationship of m> n.
The frequency dividing circuit 3 divides the pulse signal output from the magnetic sensor 2 by 1 / m during one rotation of the motor, and outputs a 0 ° phase signal to the phase circuit 4 and the adding circuit 5.
[0010]
The phase circuit 4 shifts the frequency-divided signal (0 ° phase signal) from the frequency-dividing circuit 3 to the following phases (radians) and outputs a signal for each phase to the adder circuit 5.
2π / n, 2π · 2 / n, ... 2π · (n-1) / n
The adder circuit 5 synthesizes the frequency-divided signal from the frequency divider circuit 3 and the signal phase-shifted by the phase circuit 4 to produce a 0 ° phase signal and 2π / n phase to 2π · (n−1) / n. N pulse signals composed of phase signals are output.
An example of a specific circuit configuration of the pulse number conversion circuit 1 is shown in FIG.
[0011]
Next, as a specific example of this embodiment, a case where three pulses are converted into two pulses will be described with reference to FIG.
The frequency divider 3 divides the pulse signal (a) output from the magnetic sensor 2 by 1/3 during one rotation of the motor, and outputs the 0 ° phase signal (b) to the phase circuit 4 and the adder circuit 5. Output to.
The phase circuit 4 performs a 180 ° phase shift (c) on the frequency-divided signal (0 ° phase signal) from the frequency divider circuit 3 and outputs the result to the adder circuit 5.
The adder circuit 5 synthesizes the frequency-divided signal (b) of the frequency-dividing circuit 3 and the signal (c) phase-shifted by 180 ° by the phase circuit 4, and two pulses equally divided for one rotation of the motor. The signal (d) is output.
[0012]
(Second embodiment)
FIG. 4 is a schematic diagram of the pulse number conversion circuit 1.
The present embodiment is an example in which the phase / adder circuit 6 is configured by combining the operations of the phase circuit 4 and the adder circuit 5 described in the first embodiment.
The frequency divider circuit 3 divides the pulse signal output from the magnetic sensor 2 by 1 / m during one rotation of the motor and outputs a 0 ° phase signal to the phase / adder circuit 6.
The phase / adder circuit 6 shifts the frequency-divided signal (0 ° phase signal) from the frequency-dividing circuit 3 to the following phases (radians), and synthesizes and outputs signals for each phase.
0, 2π / n, 2π · 2 / n, ..., 2π · (n-1) / n
[0013]
Next, as a specific example of the present embodiment, a case where five pulses are converted into three pulses will be described with reference to FIG.
The frequency dividing circuit 3 divides the pulse signal output from the magnetic sensor 2 by 1/5 during one rotation of the motor, and outputs a 0 ° phase signal to the phase / adder circuit 6.
The phase / adder circuit 6 shifts the frequency-divided signal (0 ° phase signal) of the frequency divider circuit 3 to 0 ° phase, 120 ° phase, and 240 ° phase, and synthesizes the signals for each phase, Three pulse signals equally divided for one rotation of the motor are output.
[0014]
(Effect of Example)
In the pulse number conversion circuit 1 of the present embodiment, m pulses are obtained by dividing the pulse signal output from the magnetic sensor 2 and shifting it for each phase equally divided for one rotation (2π) of the motor. Can be converted into n equally divided pulse signals and output.
In addition, since the converted pulse signal can be output for each phase equally divided with respect to one rotation of the motor, for example, when compared with a case where only one pulse of three pulses is removed (no phase shift), Accurate rotation information can be obtained.
[0015]
Furthermore, since the output of the existing magnetic sensor 2 used for motor rotation control can be converted and extracted as rotation information, there is no need to provide a dedicated magnetic sensor 2 for detecting the rotation information. Can cope with cost.
Also, the pulse number conversion circuit 1 is turned on / off, that is, the pulse number conversion circuit 1 is used to convert the pulse number, and the pulse number conversion circuit 1 is not used and the pulse number conversion circuit 1 is not converted. Thus, the number of pulses output per one rotation of the motor can be selected (for example, 3 pulses or 2 pulses).
[Brief description of the drawings]
FIG. 1 is a schematic diagram of a pulse number conversion circuit (first embodiment).
FIG. 2 is a circuit diagram of a pulse number conversion circuit.
FIG. 3 is a schematic diagram showing an example of pulse number conversion (first embodiment).
FIG. 4 is a schematic diagram of a pulse number conversion circuit (second embodiment).
FIG. 5 is a schematic diagram showing an example of pulse number conversion (second embodiment).
[Explanation of symbols]
1 Pulse number conversion circuit 2 Magnetic sensor (pulse generation means)
3 Dividing Circuit 4 Phase Circuit 5 Adder Circuit 6 Phase / Adder Circuit

Claims (3)

A pulse generating means for outputting a predetermined number of pulse signals in synchronism with the rotation of the motor during one rotation of the motor;
When the number of pulses output from the pulse generating means during one rotation of the motor is m (natural number), the m pulse signals are divided into n (natural number, equal to one rotation of the motor). However, it is a pulse number conversion circuit for converting into a pulse signal of m> n),
After dividing the pulse signal output from the pulse generating means to 1 / m, a signal for each next phase (radian) is created based on the divided signal,
0, 2π / n, 2π · 2 / n, ..., 2π · (n-1) / n
A pulse number conversion circuit for a motor, which combines the signals for each phase and outputs the n pulse signals. The pulse number conversion circuit for a motor according to claim 1,
A frequency dividing circuit that divides the pulse signal output from the pulse generating means into 1 / m;
A phase circuit that shifts the frequency-divided signal of the frequency-dividing circuit to each of the following phases;
2π / n, 2π · 2 / n, ... 2π · (n-1) / n
A divided signal a 0 ° phase, which is divided by the frequency dividing circuit, a motor, characterized in that it comprises an adding circuit for combining the signals of each phase that is phase-shifted by the phase circuit Pulse number conversion circuit. In the motor pulse number conversion circuit according to claim 1 or 2,
The pulse number conversion circuit for a motor, wherein the pulse generation means is a magnetic sensor that detects a change in magnetic flux generated according to the rotation of the motor and outputs an electric signal.

Images