JP3286864B2 - Motor connection inspection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor connection inspection apparatus for inspecting whether or not a lead wire of a stator is correctly connected to a power terminal of a motor body in a process of assembling the motor having a stator field winding. is there.

[0002]

2. Description of the Related Art Generally, in the process of assembling an induction motor having a stator field winding, a connection step of connecting a lead wire of the stator field winding to a power supply terminal of a motor body and a proper connection work are performed. There is an inspection process for inspecting whether or not it has been performed. It is possible to arrange this inspection step after the completion of the assembly of the motor, but it is desirable to arrange the inspection step immediately after the connection step in order to reduce the loss due to the occurrence of defective products. In particular, in the scroll compressor shown in FIG. 5, it is indispensable to arrange the motor connection inspection step immediately after the connection step because it is difficult to repair the connection after assembly as described below.

FIG. 5 is a cross-sectional view of a scroll compressor as an example of an object to be inspected for motor connection. In the drawing, reference numeral 1 denotes a fixed scroll in which a spiral portion 1b is formed on a base plate 1a; Is a swinging scroll in which a spiral portion 2b is formed. The spiral portions 1b and 2b are formed so that the directions of the spirals are opposite to each other and are combined with each other to form a compression chamber 4. Reference numeral 3 denotes a discharge port formed in the base plate 1a, and communicates with the compression chamber 4. Reference numeral 6 denotes a crankshaft having a motor rotor 8 at the center and rotatably supported by bearings 13. Reference numeral 7 denotes a frame that fixedly supports the fixed scroll 1 and has a bearing 13 at the center. 8 is a motor rotor (hereinafter referred to as a motor rotor), 9 is a motor stator (hereinafter referred to as a motor stator), and the motor rotor 8 and the motor stator 9 constitute a three-phase two-pole induction motor; The three lead wires 11 of the motor stator 9 are connected to three pins of a glass terminal (power supply terminal) 42, respectively. Reference numeral 10 denotes a lower shell hermetically welded to the lower end of the center shell 23, in which refrigeration oil is stored. 11 is a lead wire, 13 is a bearing provided at the center of the frame 7, 20 is a discharge chamber hermetically welded to the upper end of a center shell 23, 23 is a glass terminal 42 attached to an intermediate portion and It is a center shell that supports the motor stator 9, and the frame 7 is shrink-fitted and fixed to the inner peripheral portion at the upper end. Reference numeral 27 denotes a bearing 39 which is fixedly welded to the inner peripheral portion at the lower end of the center shell 23 and rotatably supports the lower end of the crankshaft 6 at the center.
And a pump 4 is provided below the bearing 39.
3 are stored. 39 is a bearing, 42 is a glass terminal,
43 is a pump.

Since the scroll compressor is constructed as described above, the lead wire 11 and the glass terminal 42 are provided after the step of shrink-fitting the frame 7 to the center shell 23.
If a process for inspecting the connection state is arranged, it cannot be repaired even if there is an inconvenience as a result of the inspection. Therefore, immediately after the electric motor stator 9 is fixed to the center shell 23 and the lead wire 11 is connected to the glass terminal 42, an electric motor connection inspection step in the scroll compressor is provided.

FIG. 6 shows, for example, a magazine “Nikkei Mechanical” 1
It is a partially cutaway side view of the conventional motor connection inspection device described on page 37 of June 29, 992. In the figure, reference numeral 23 denotes a center shell to which a glass terminal 42 is attached at an intermediate portion and which supports an electric motor stator 9 on an inner periphery. Three lead wires 11 are connected to three pins of the glass terminal 42. The work to be inspected is configured.

In FIG. 6, reference numeral 52 denotes a rod, 53 denotes a vertical movement mechanism which moves up and down by an air cylinder 54, 54 denotes an air cylinder, and 55 denotes three contactors corresponding to three pins of the glass terminal 42. These three contactors 5
Reference numeral 5 is connected to a power supply device (not shown) for applying a three-phase AC voltage to each contactor. 56 is the air cylinder 5
7 is an air cylinder, 57 is an air cylinder, 58 is a mount of this motor connection inspection device, 59 is a jig pallet for positioning a work to be inspected, 60 is a bearing for rotatably supporting a rod 52, and 70 is a bearing. A dummy rotor that simulates the motor rotor 8 and is connected to the rod 52. Reference numeral 71 denotes a signal plate connected to the rod 52 and having a slit on the outer periphery. Reference numeral 72 denotes two photosensors for detecting the rotation direction of the signal plate 71, and determines whether or not the connection between the lead wire 11 and the glass terminal 42 is good. Is connected to a determination device (not shown) that performs

Next, the operation will be described. First, the vertical movement mechanism 53 is lowered by the air cylinder 54 and the rod 5
The dummy rotor 70 is positioned inside the motor stator 9 via the second rotor 2. Next, the horizontal movement mechanism 56 is advanced by the air cylinder 57, and the three contactors 55 are connected to the three pins of the glass terminal 42. Further, the power supply device is operated to apply a three-phase AC voltage to the motor stator 9 via the three contactors 55 and the three pins of the glass terminal 42. As a result, if the connection between the lead wire 11 of the electric motor stator 9 and the glass terminal 42 is correctly made, the dummy rotor 70 rotates in a predetermined direction, and accordingly, the rotating plate 71 rotates in the same direction. On the other hand, if the connection is not made correctly, the dummy rotor 70 and the rotating plate 71 rotate in the opposite direction or do not rotate at all.
The determination device determines the rotation direction of the dummy rotor 70 and the rotating plate 71 based on the pattern of the output signal of the photosensor 72, and determines the lead wire 11 of the motor stator 9 and the glass terminal 4.
It is determined whether or not the connection to 2 is correct.

[0008]

Since the conventional motor connection inspection apparatus is constructed as described above, it is necessary to supply sufficient electric power to the motor stator 9 to rotate the dummy rotor 70, and the There is a problem that a power supply device having a large capacity is required, and the price of the device becomes high.

In order to inspect motor stators 9 having different inner diameters, a dummy rotor having an outer diameter corresponding to the inner diameter of the motor stator 9 to be inspected must be prepared. If the changeover of the motor connection inspection apparatus is automatically performed in accordance with the change, there is a problem that the scale of the apparatus becomes large and the apparatus becomes expensive.

Furthermore, the conventional motor connection inspection apparatus has a problem in that if the motor stator 9 having a different winding specification is erroneously mounted on the center shell 23, there is no function of detecting the erroneous insertion. Was.

The invention of claim 1 has been made in order to solve the above-mentioned problems, and a small-capacity power supply device can be used, and the inner diameter of the stator and the winding specifications of various models are various. It is an object of the present invention to provide an inexpensive motor connection inspection device that can automatically perform a changeover of a motor.

According to the second aspect of the present invention, a small-capacity power supply device can be used, and the setup change can be automatically performed for various types of motors having various inner diameters and winding specifications of the stator. It is an object of the present invention to obtain a compact and inexpensive motor connection inspection device that also has a function of determining an erroneous insertion of a motor model.

[0013]

According to a first aspect of the present invention, there is provided a motor connection inspection apparatus comprising: a power supply for supplying electric power to a stator of a motor; and a power supply supplied by the power supply.
And one Hall element for detecting the magnetic field generated in the stator of the electric motor, and fixed to the Hall element in the distal portion b
And the Hall element through the rod and the stage.
To the center of the space inside the
A vertical mechanism provided so as to face the surface, and fixing the Hall element in one specific direction on the inner surface of the stator.
A magnetic field measuring device for measuring the magnetic field generated in the stator to receive the detected output, a selection device for selectively connecting the power supply to the power terminal of the motor, depending on the selection of the selection device in a particular direction The measurement results of the above magnetic field measurement device
Make a connection between the power supply terminal and the lead wire of the motor stator.
A determination device for determining the quality of the line .

According to a second aspect of the present invention, there is provided an electric motor connection inspection apparatus comprising: a power supply device for supplying electric power to a stator of the electric motor;
The motor is operated by the power supplied by the power supply unit.
One Hall element that detects the magnetic field generated in the motor,
A rod having the Hall element fixed to the tip,
The Hall element is connected to the space inside the stator
Move to the approximate center to face the inner surface of the stator
Controls the orientation of the hall element and the above-mentioned Hall element
Direction control device, and the direction control device,
Fix the Hall element in two specific directions on the inner surface of the data
Measure the magnetic field generated by receiving the detected output.
A magnetic field measuring device, and a power supply terminal of the electric motor.
A selective device that selectively connects to the
The measurement result of the magnetic field measurement device according to the selection of the selection device
The power supply terminal and the stator of the motor.
And a determination device for determining the quality of the connection with the lead wire .

[0015]

According to the first aspect of the present invention, there is provided a motor connection inspection apparatus, wherein a power supply device is selectively connected to a power supply terminal of the motor by a selection device, and power is supplied to the stator from the power supply device. Is detected by one Hall element, and this Hall element is identified to the inner surface of the stator.
The magnetic field detected while fixing in one direction is measured by the magnetic field measuring device, and the selection device is selected by the determining device and the result of the measurement in one specific direction on the inner surface of the stator of the magnetic field measuring device is determined, and the power supply terminal is determined. Since the quality of the connection with the lead wire of the stator of the motor is determined, there is no need to provide a dummy rotor, and a large-capacity power supply is not required. A small and inexpensive motor connection inspection apparatus capable of automatically performing setup change is obtained. In addition, one Hall element
Since only a single unit is used, an inexpensive motor connection inspection apparatus with a small number of parts can be obtained.

According to the second aspect of the present invention, there is provided a motor connection inspecting device, wherein a direction control device is adapted to use a stay corresponding to a model to be inserted in advance.
The magnetic field generated inside the stator is detected by Hall elements directed in two specific directions on the inner surface of the stator, and the magnetic fields in the specific two directions detected by the Hall elements are measured by a magnetic field measuring device, and the lead of the stator is determined by a determination device. It determines whether the connection between the wire and the power supply terminal is good and whether the input model is correct.
A compact and inexpensive motor connection inspection that does not require a dummy rotor according to the model, does not require a large-capacity power supply, can automatically perform setup changeover, and has a function to determine the incorrect insertion of a model. A device is obtained.

[0017]

[Embodiment 1] An embodiment of the present invention will be described below with reference to the drawings. FIG.
FIG. 7 is a partially cutaway side view of the motor connection inspection apparatus according to one embodiment of the present invention. The same components as those in the conventional example of FIG. 6 are denoted by the same reference numerals, and description thereof will be omitted.

In FIG. 1, the three lead wires 11 are identified by black (U), white (V), and red (W), respectively. 5
Numeral 1 denotes a Hall element attached to the tip of the rod 52 and connected to a magnetic field measuring device (not shown). The orientation of the Hall element 51 is indicated by the slot number in the top view of the core of the motor stator 9 shown in FIG. 1 to 2 clockwise
If it is 4, for example, it faces the direction of slot number 11. The three contactors 55 are connected to two output terminals of a DC power supply (power supply) (not shown) via a relay circuit (selection device) not shown, and the relay circuit is designated by the three contactors 55. It has a function of connecting the two to the two output terminals of the DC power supply. Also,
Both the magnetic field measurement device and the relay circuit are connected to a determination device (not shown).

Next, the operation will be described. First, the vertical movement mechanism 53 is lowered by the air cylinder 54 and the rod 5
2, the Hall element 51 is positioned inside the motor stator 9. Next, the horizontal movement mechanism 56 is advanced by the air cylinder 57, and the three contactors 55 are connected to the three pins of the glass terminal (power supply terminal) 42. Next, the relay circuit is differentiated, two of the three contactors 55 are connected to the two output terminals of the DC power supply device, and two of the contactors 55 and three pins of the glass terminal 42 are connected. DC power is applied from the DC power supply to the motor stator 9 through two of the above, and a DC magnetic field generated in the motor stator 9 by the DC power is detected by the Hall element 51. The DC magnetic field detected by the Hall element 51 is measured by a magnetic field measuring device, and this measured value is used as a first magnetic field measured value. Next, the relay circuit is switched to change the connection between the contactor 55 and the DC power supply device, DC power is applied, the DC magnetic field generated in the motor stator 9 is detected by the Hall element, and the measurement is performed by the magnetic field measurement device. The value is taken as the second magnetic field measurement. Based on the first magnetic field measurement value and the second magnetic field measurement value, the determination device determines the lead wire 1 of the motor stator 9.
The quality of the connection between 1 and the glass terminal 42 is determined.

Here, the determination operation of the determination device will be described with reference to the following table. Now, a DC voltage is applied to each lead wire 11 under the six conditions shown in Table 1. In Table 1, “+” indicates a state where a lead wire is connected to a “+” output terminal of the DC power supply, “−” indicates a state where a lead wire is connected to a “−” output terminal of the DC power supply, and “open”. Indicates an open state in which the lead wire is not connected to the power supply. Under each condition, the current value output from the DC power supply is the same.

[0021]

[Table 1]

In this state, when the Hall element 51 is inserted into the center of the motor stator 9, the magnetic field inside the motor stator 9 can be measured. The measured value of the magnetic field inside the motor stator 9 changes as shown in the graph of FIG. 3 according to the applied state of the six types of DC power and the direction of the Hall element 51 inside the motor stator 9. In the graph of FIG. 3, the horizontal axis represents the slot number of the motor stator 9 indicating the direction of the Hall element 51, and the vertical axis represents the measured value of the magnetic field.
From FIG. 3, it can be seen that the magnetic field is a sine function related to the orientation of the Hall element and the phase differs by 60 ° in any of the DC power application states.

Now, when the Hall element 51 is oriented in the direction of the slot number 11, the DC power condition NO. When 1 is applied, at least when the connection of the black (U) and white (V) lead wires 11 is correctly performed, the magnetic field measurement value is 25 Gauss. If the black (U) and white (V) connections are incorrect, the condition No. When any one of the terminals 2 to 6 or two or more terminals are in the open state, the magnetic field measurement value is 12.5 gauss or less, so that the quality of the connection can be determined.

Next, the relay circuit is switched only for those for which the connection of black (U) and white (V) is determined to be correct, and the condition NO. 2 is applied. At this time, when the connection of red (W) is performed correctly, the magnetic field measurement value is -7.5 gauss. However, when the connection of red (W) is not performed correctly, the magnetic field measurement is performed. Since the value is 0 Gauss, the quality of the connection can be determined.

Embodiment 2 FIG. FIG. 4 is a partially cutaway side view showing a second embodiment of the present invention. The difference from the first embodiment is that in the first embodiment, a rod 52 is attached to a vertical movement mechanism 53 and a hole is formed. While the direction of the element 51 is fixed, in this embodiment, the rod 52 is rotatably supported by a bearing 60 with respect to a vertical movement mechanism 53, and further, the rod 52 is attached to the rod 52 by a stepping motor (direction control device) 61. That is, the orientation of the mounted Hall element 51 can be arbitrarily controlled.

Next, the operation will be described. First, the stepping motor 61 is controlled so that the Hall element 51 is oriented in the direction of the slot number 11 of the motor stator 9. Next, the Hall element 51 is lowered by the vertical movement mechanism 53 and positioned inside the motor stator 9. Next, the horizontal movement mechanism 56 is advanced, and the three contactors 55 are connected to the glass terminals 4.
2. Make contact with the three pins. Next, the relay circuit is activated, and the lead wire 11 of the electric motor stator 9 is connected to the lead wire 11 of the electric motor stator 9 via the three contactors 55 and the three pins of the glass terminal 42 under the condition Nos. In the state of 1, the DC power supply is connected to the DC power supply and the DC power is supplied to the motor stator 9 to measure a DC magnetic field generated by the Hall element 51 and the magnetic field measuring device. Magnetic field measurement value.
Next, the stepping motor 61 is controlled to control the Hall element 51.
In the direction of the slot number 15 of the motor stator 9. Further, by switching the relay circuit, the condition N in Table 1 is changed.
O. In the state of 2, the lead wire 11 is connected to the DC power supply,
The magnetic field measured by applying DC power to the motor stator 9 is defined as a second magnetic field measurement value. If the first magnetic field measurement value and the second magnetic field measurement value are values corresponding to the assumed model, the determination device determines that the input model is correct and that the connection is correctly performed.

[0027]

As described above, according to the first aspect of the present invention,
A power supply device for supplying electric power to a stator of an electric motor, and the power supply
The stator of the electric motor is driven by the electric power supplied by the device.
One Hall element that detects the magnetic field generated in the
A rod with a Hall element fixed to the tip and the rod
Through the Hall element approximately in the space inside the stator
To the center of the stator to face the inner surface of the stator.
The vertical mechanism and the Hall element
Receives the detected output while fixing it in one specific direction on the surface.
Magnetic field measurement device that measures the magnetic field generated in the stator
To selectively connect the power supply to the power terminal of the motor.
Selection device in response to selection of the selection device in one particular direction.
The power supply terminal
Judgment of the connection of the motor to the stator lead wire
And a determination device, so that the power supply device only needs to supply enough power to generate a magnetic field sufficient for measurement by the Hall element inside the motor stator, and a small-capacity power supply device can be used. In addition, there is an effect that a small and inexpensive motor connection inspection apparatus capable of automatically performing setup change for various types of motors having various stator inner diameters and winding specifications is obtained. Further, since only one Hall element is used, an inexpensive motor connection inspection apparatus with a small number of parts can be obtained.

According to the second aspect of the present invention, the stay of the electric motor is
And a power supply for supplying power to the power supply.
Generated in the stator of the electric motor by the
One Hall element for detecting the field and the Hall element
A rod fixed to the end, and
To the approximate center of the space inside the stator.
Lifting machine provided so as to face the inner surface of the stator
Direction control device for controlling the orientation of the Hall element
And specifying the inner surface of the stator by the direction control device.
The Hall element was fixed in the two directions of
Magnetic field measuring device that measures the magnetic field generated by receiving the output
And selectively connect the power supply to a power supply terminal of the motor.
A selection device that follows, and the selection device in two specific directions.
Determine the measurement result of the above magnetic field measurement device according to the selection and
Connection between the power supply terminal and the lead wire of the motor stator
And a judgment device for judging whether the Hall element is good or bad.By changing the direction of the Hall element according to the assumed input model, a large-capacity power supply is unnecessary and the setup can be automatically changed. Thus, there is an effect that a small and inexpensive motor connection inspection apparatus that can determine whether connection is good or not and whether the input model is correct or not can be obtained.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view of a motor connection inspection device according to a first embodiment of the present invention.

FIG. 2 is a top view of a core portion of the motor stator according to the embodiment of FIG.

3 is a graph showing an example of a measured value of a magnetic field with respect to a direction of a Hall element in the embodiment of FIG. 1;

FIG. 4 is a partially cutaway side view of a motor connection inspection device according to a second embodiment of the present invention.

FIG. 5 is a cross-sectional view of a scroll compressor which is an example of an inspection target of the motor connection inspection device according to the present invention.

FIG. 6 is a partially cutaway side view showing a conventional motor connection inspection device.

[Explanation of symbols]

 9 Stator of electric motor 11 Lead wire 42 Glass terminal (power supply terminal) 51 Hall element 61 Stepping motor (direction control device)

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G01R 31/02-31/06 G01R 31/34 H02K 11/00 H02K 15/00

Claims (2)

(57) [Claims] 1. A power supply device for supplying electric power to a stator of an electric motor, one Hall element for detecting a magnetic field generated in the stator of the electric motor by the electric power supplied from the power supply device, A rod fixed to the portion and the Hall element via the rod inside the stator.
To the center of the space to face the inner surface of the stator.
A vertical movement mechanism which is arranged to, solid the Hall element to a specific direction of the stator inner surface
A magnetic field measuring device that receives the output detected while measuring the magnetic field generated in the stator, and a selecting device that selectively connects the power supply device to a power supply terminal of the electric motor ; A determination device that determines a measurement result of the magnetic field measurement device according to the selection of the selection device, and determines whether connection between the power supply terminal and a lead wire of a stator of the motor is good or not. (2)Power supply for supplying electric power to the motor stator
And The electric power supplied by the power supply unit causes the motor
One Hall element that detects the magnetic field generated in the data
When, A rod having the Hall element fixed to the tip thereof, The Hall element is inserted into the stator through the rod.
To the center of the space to face the inner surface of the stator.
An up and down mechanism provided to  A direction control device for controlling the direction of the Hall element,The specific direction of the stator inner surface is determined by the direction control device.
Output detected by fixing the Hall element in the direction
A magnetic field measuring device for measuring the magnetic field generated by receiving the Selectively connecting the power supply to a power terminal of the motor;
A selection device; The magnet according to the selection of the selection device in two specific directions
Field measurement device The power terminal and the power
A judgment to determine the connection of the motive
Setting device,  Motor connection inspection device equipped with