JP2003028938A - Apparatus and method for inspection of motor and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus and a method for the inspection of a motor, where at least one from among the defect and the absence of a varistor arranged and installed at an armature can be determined, and to provide a method of manufacturing the motor. SOLUTION: The motor inspection apparatus is related to the inspection apparatus of the motor 2, at which the varistor 4 is arranged and installed. The apparatus is provided with an AC generator 12, which applies a prescribed AC voltage to the DC power-supply connection part of the motor 2, an AC current converter 6, which measures the AC current waveform of the DC power- supply connection part during at least one rotation of the armature 3 and a determining device 9, in which at least one among the defect and the absence of the varistor 4 is determined by comparing a voltage-current characteristic, obtained from the converter 6 with a preset reference voltage-current characteristic.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor inspection device, a motor inspection method, and a motor manufacturing method, and in particular,
The present invention relates to a motor inspection device, a motor inspection method, and a motor manufacturing method that determine at least one of a varistor provided on an armature and the presence or absence of a missing item.

[0002]

2. Description of the Related Art Conventionally, in a DC type motor having a commutator and a brush, sparks fly to a sliding contact portion between the commutator and the brush during rotation of the motor, and at this time, a voltage of 30
It is known that a very wide range of noise of 0 V to 500 V and a frequency of several kHz to several GHz is generated. Due to this noise, there is a concern about noise interference such as induction of radio interference such as television interference and malfunction of electronic devices such as LSIs and microcomputers.

Therefore, many motors in which a varistor is connected to a drive circuit have been disclosed in order to eliminate these noise obstacles. Here, a varistor is a sintered body obtained by press-molding a material in which a metal oxide is mixed with silicon carbide or zinc oxide and then firing it, and the resistance value changes nonlinearly with voltage. A semiconductor device that has an excellent surge absorption capability due to the property of

However, as described above, since the varistor is composed of a sintered body of a mixture, it is known that internal defects such as cracks occur. As a matter of course, at the product shipping stage of the factory that manufactures this varistor, a good product selection inspection is performed to select a normal product and a defective product by a known method such as an ultrasonic echo flaw detection method. In a factory that manufactures motors that incorporate varistor,
After incorporating the varistor inside the motor, it is very difficult to perform a non-defective product inspection of the varistor alone by the ultrasonic echo flaw detection method described above.

Therefore, in the motor assembling process, an inspection method is required which can easily perform a non-defective item inspection of the varistor even after the varistor is incorporated inside the motor. Generally, as shown in FIG. Various inspection methods are known.

That is, in the inspection apparatus 101 using the conventional inspection method shown in FIG. 21, the motor 1 to be inspected is
DC power supply 113 for supplying electric power to the motor 02 and the motor 102.
Of the power line 105a, 105b of the line filter 106, and the line filter 106 is connected using a signal cable 108.
Spectrum analyzer 109 for analyzing signals from
And a display 110 that is integrated with the spectrum analyzer 109 is used.

The motor 102 to be inspected is
The armature 103 is provided inside the armature 103.
A varistor 104 is provided in the. While the motor 102 is rotating, noise is generated from the sliding contact portion between the commutator and the brush (neither of which is shown). To absorb this noise, the varistor 104 uses the motor 102.
Is connected to a predetermined electric circuit (not shown) provided inside.

[0008] In the conventional inspection method, the line filter 106 has the power lines 105a, 105 of the motor 102.
The output terminal (not shown) of the line filter 106 and the input terminal (not shown) of the spectrum analyzer 109 are connected by a signal cable 108 so as to cover b and measure noise during rotation of the motor 102. It can be carried out.

If the varistor 104 has some trouble, for example, an internal defect occurs or the varistor 104 itself is out of stock, the sliding contact portion between the commutator and the brush (neither is shown) during rotation of the motor 102. The noise generated from the spectrum analyzer 1 is measured without being suppressed by the line filter 106 as described above.
The noise waveform can be observed by the display 110 provided in 09.

Then, for example, in an inspection process which is a post-process of the assembly process, an unillustrated measurer (inspector) inspects the assembled motor 102 by the above-described measuring method, and a harmonic wave of about 200 MHz to 1 GHz. In the frequency band,
When a measurement result such as a surge-like noise having a predetermined peak value is obtained, it can be understood that the varistor 104 arranged inside the motor 102 is defective. The motor 102 can be sorted as a defective product.

[0011]

However, in the spectrum analyzer 109 used in the above inspection method, in order to obtain a highly reliable and accurate signal waveform, it is necessary to perform signal averaging several times and average them. Therefore, there is a problem in that it is impossible to improve the production efficiency because the inspection process requires time because the measurement takes time.

Further, in the above inspection method, when the varistor 104 arranged inside the motor 102 to be inspected has an internal defect or the like, the motor 10 is inspected.
2 may generate noise. Therefore, when a plurality of inspected objects are inspected at the same time by using the inspecting apparatus 101 in a situation where adjacent inspection lines are close to each other, noise is generated from one inspected object having a defect. May occur, which may affect the noise measurement of other inspected objects. Therefore, there is a problem that a predetermined interval must be provided between each inspection line in order to prevent deterioration of inspection accuracy.

Further, in general, the line filter 106
Since the spectrum analyzer 109 is a very expensive measuring device, it is uneconomical to inspect a large number of these measuring devices in the inspection process, which is a post-process of the assembly process, and the production efficiency is improved. There is a problem that you can not plan.

The present invention has been made in view of the above problems, and at least one of varistor deficiency and absence or absence of varistor can be accurately measured in a short time without using a very expensive measuring instrument. An object is to provide a motor inspection device, a motor inspection method, and a motor manufacturing method that can make a determination.

Another object of the present invention is to determine at least one of the varistor defect and the absence or absence of the varistor without generating noise from the sliding contact portion between the commutator and the brush during rotation of the motor. A motor inspection device, a motor inspection method, and a motor manufacturing method are provided.

[0016]

According to a first aspect of the present invention, there is provided an inspection device for a motor in which a varistor is arranged on an armature, wherein a predetermined AC voltage is applied to a DC power supply connection portion of the motor. An alternating current generator that applies a voltage, an alternating current converter that measures an alternating current waveform of the direct current power supply connection during at least one rotation of the armature, and a voltage-current characteristic obtained from the alternating current converter are predetermined. It is solved by providing a judging device for judging at least one of the varistor defect and the absence or absence of the varistor by comparing the reference voltage current characteristics.

According to the second aspect of the present invention, there is provided a method for inspecting a motor in which a varistor is arranged on an armature, wherein a predetermined AC voltage is applied to a DC power source connecting portion of the motor. By measuring the AC current waveform of the DC power supply connection during at least one revolution of the armature, and comparing the voltage-current characteristics obtained from the AC current waveform with a predetermined reference voltage-current characteristic It is solved by determining at least one of the presence or absence of a missing item.

Further, according to the invention of claim 3, the above-mentioned problem is a method for manufacturing a motor having an armature in which a DC power source connecting portion and a varistor are arranged, wherein the DC power source connecting portion and the varistor are provided. And a step of assembling the motor by assembling a member including the armature, applying a predetermined AC voltage to the DC power supply connection portion of the motor assembled in the assembling step, and performing at least one rotation of the armature. At least one of the varistor defect and the absence or absence of the varistor is measured by measuring the AC current waveform of the DC power supply connection part in, and comparing the voltage-current characteristic obtained from the AC current waveform with a predetermined reference voltage-current characteristic. It is solved by comprising an inspection process for determining one.

[0019]

According to the invention described in claim 1, an AC generator for applying a predetermined AC voltage to the DC power supply connection portion of the motor, and an AC current of the DC power supply connection portion during at least one rotation of the armature. At least one of the varistor defect and the absence or absence of the varistor is determined by comparing an AC current converter measuring a waveform and a voltage-current characteristic obtained from the AC current converter with a predetermined reference voltage-current characteristic. And a determiner for performing.

Since the measurement of the AC current waveform using the AC current converter is performed during at least one revolution of the armature, at least one of the varistor defect and the absence or absence of the varistor can be determined in a short time. You can

Further, the AC voltage applied from the AC generator to the DC power source connecting portion is several tens of kHz, which does not affect other adjacent inspection lines due to noise generation, so that the inspection accuracy is lowered. It is possible to determine at least one of the varistor defect and the absence / presence of a missing item without the need.

Further, since the AC generator, the AC current converter, the amplifier, and the determiner are general equipment, varistor defects and missing parts can be produced without using expensive equipment such as line filters and spectrum analyzers. At least one of the presence and absence can be determined.

According to a second aspect of the present invention, a predetermined AC voltage is applied to the DC power supply connection portion of the motor, and the AC current waveform of the DC power supply connection portion during at least one revolution of the armature is measured, By comparing the voltage-current characteristic obtained from the AC current waveform with a predetermined reference voltage-current characteristic, at least one of the varistor defect and the absence / presence of a missing item is determined.

Since the measurement of the AC current waveform for determining at least one of the varistor defect and the absence or absence of the varistor is performed during at least one rotation of the armature, the varistor defect and the deficiency of the product are short. It is possible to determine at least one of the presence or absence of.

Further, the AC voltage applied to the DC power supply connecting portion for determining at least one of the varistor defect and the absence or absence of the varistor is several tens kHz, and noise is generated in another adjacent inspection line. Therefore, it is possible to determine at least one of the varistor defect and the absence / presence of a missing item without lowering the inspection accuracy.

Further, the measuring instruments used for determining at least one of the varistor defect and the absence / presence of the varistor are general instruments such as an AC generator, an AC current converter,
An amplifier and a determiner are used. Therefore, it is possible to determine at least one of the varistor defect and the absence or absence of the varistor without using an expensive device such as a line filter or a spectrum analyzer.

According to a third aspect of the present invention, there is provided a method of manufacturing a motor having a DC power supply connecting portion and an armature provided with a varistor, wherein the DC power source connecting portion, the varistor and the armature are provided. An assembling step of assembling the motor by assembling members including the members, and applying a predetermined AC voltage to the DC power source connecting portion of the motor assembled in the assembling step to connect the DC power source during at least one rotation of the armature. A test for determining at least one of the varistor defect and the absence or absence of the varistor by measuring an AC current waveform of a portion and comparing a voltage-current characteristic obtained from the AC current waveform with a predetermined reference voltage-current characteristic. And a process.

Here, since the measurement of the AC current waveform for determining at least one of the varistor defect and the absence or absence of the varistor in the inspection step is performed during at least one rotation of the armature, the varistor defect is short. It is possible to determine at least one of the presence or absence of a missing item.

Further, in order to determine at least one of varistor deficiency and presence / absence of varistor, the AC voltage applied to the DC power supply connection portion is several tens of kHz, and noise is generated in another adjacent inspection line. Therefore, it is possible to determine at least one of the varistor defect and the absence / presence of a missing item without lowering the inspection accuracy.

Further, the measuring instruments used for determining at least one of the varistor defect and the absence or absence of the varistor include an ordinary generator such as an AC generator, an AC current converter,
An amplifier and a determiner are used. Therefore, it is possible to determine at least one of the varistor defect and the absence or absence of the varistor without using an expensive device such as a line filter or a spectrum analyzer.

Thus, even after the motor is assembled,
Since it is possible to determine whether the varistor installed inside the motor is defective or missing, it is possible to prevent the shipment of a varistor missing or missing motor as a product. You can

[0032]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a motor inspection device, a motor inspection method, and a motor manufacturing method according to the present invention will be described below with reference to the drawings. The members, arrangements, etc. described below do not limit the present invention, and it goes without saying that various modifications can be made in accordance with the spirit of the present invention.

FIG. 1 is an overall configuration diagram showing an embodiment of a motor inspection device 1 according to the present invention. In this inspection device 1, the motor 2 to be inspected has a DC power source 13 through a pair of power lines 5a and 5b as a DC power source connecting portion.
It is connected to the. The AC generator 12 is connected in parallel with the DC power supply 13. An alternating current converter 6 is connected to one power line 5b, and the alternating current converter 6 is connected to an amplifier 7. And
The amplifier 7 is connected to the determiner 9 via the signal cable 8.

Further, FIG. 2 shows an internal configuration diagram of the motor 2. As shown in the figure, the motor 2 is of a direct current type, and includes an armature 3, a commutator 16 disposed in the armature 3, and a pair of brushes 14 slidingly contacting the commutator 16.
a and 14b. The winding 15 for generating magnetic force is represented by an equivalent circuit composed of an inductor 17 and a resistor 18. The varistor 4 is connected between the windings 15. The current supplied from the DC power supply 13 flows through the windings 15 via the brush 14b on the anode side and the commutator 16, and the armature 3 described above is configured to rotate.

Further, since the DC power supply 13 shown in FIG. 1 needs to be matched with the rating of the motor 2 to which the current is supplied, the commercial AC power supply can be AC / DC converted and stepped down to a predetermined voltage. It is desirable to use a general DC power supply device that can be used, but a so-called dry battery or battery may be used.

Further, the AC generator 12 is capable of generating a sine wave having a voltage and a frequency as set, and, for example, has an AC / DC converter and an inverter circuit (not shown) therein. That is, the AC generator 12 AC / DC-converts a commercial AC power supply by using the AC / DC converter, steps down the voltage to a predetermined voltage, and then gives a pass signal having a predetermined frequency to the inverter circuit. By doing so, an arbitrary sine wave can be obtained.

Further, FIG. 3 shows a configuration diagram of a main part of a current probe 31 which is an embodiment of the alternating current converter 6 according to the present invention. As shown in the figure, the current probe 31 includes an upper clamp 32 and a lower clamp 33 made of an insulating material, and the central portions of the upper clamp 32 and the lower clamp 33 are
The clamp hole 34 is formed, and the power line 5b can penetrate the clamp hole 34. A coil portion 35 is arranged along the inside of the clamp hole 34. The coil portion 35 detects a magnetic force generated from the power line 5b and converts the magnetic force into a voltage, which is output from the output portion 36 to an external device. It is configured to be able to output the measured voltage.

Further, FIG. 4 shows an overall configuration diagram of an AC sensor 41 which is another embodiment of the AC current converter 6 according to the present invention. As shown in the figure, the AC sensor 41 includes an upper clamp 42 and a lower clamp 43 which are made of an insulating material, and a clamp hole 44 is formed at the center of the upper clamp 42 and the lower clamp 43. The power line 5b can pass through the hole 44. Further, the Hall element 45 is provided at a position along the radial direction of the clamp hole 44.
a, 45b are arranged, and the Hall elements 45a, 45
The magnetic force generated from the power line 5b is detected by b, converted into a voltage, and the measured voltage can be output from the output unit 46 to an external device.

As described above, the alternating current converter 6 shown in FIG.
Is a non-contact type that can measure the alternating current flowing through the power line 5b and can convert the measured alternating current into a voltage for output. By using the AC current converter 6 which can measure the AC current in such a non-contact manner, the inspection can be performed without damaging the final product.

Many current probes 31 or AC sensors 41 as shown in FIG. 3 or FIG. 4 are equipped with an amplifier (not shown) therein, and these are used in the present invention. The current probe 31 or the AC sensor 41 having the built-in amplifier may be used. By using the current probe 31 or the AC sensor 41 having such an amplifier built-in, it is possible to eliminate the amplifier 7 to be described later connected to the AC current converter 6 in FIG. It is possible to reduce the troublesomeness and the inspection cost.

Further, the amplifier 7 shown in FIG. 1 is provided with an operational amplifier IC or the like therein, and is capable of amplifying only the voltage and outputting the amplified signal while maintaining the frequency of the input signal. . Also, in general, the amplifier 7
Is commercially available as an accessory to the above-mentioned current probe 31 or AC sensor 41, and in this case, it is desirable to use the attached amplifier 7. Further, since some of the AC current converters 6 have the amplifier 7 built therein as described above, in this case, it is not necessary to separately prepare the amplifier 7, and the determination unit 9 to be described later does not require the AC current converter 6 to be provided. Can be directly connected.

Further, the judging device 9 judges at least one of the frequency extracting section 52 for extracting only the predetermined frequency of the input signal and the varistor 4 disposed inside the motor 2 and the presence or absence of a missing item. It is composed of a determination unit 51.

The judging section 51 is composed of a simple electric circuit having a well-known comparison circuit (not shown). In addition, in recent years,
Since the measurement technique using a personal computer has been established, a personal computer using an interface such as RS-232C may be used. Further, the determination unit 51 is connected to a display device 10 such as an LED and an input device 11 such as a switch, and the display device 10 and the input device 11 are connected.
Is configured so that the inspection can be performed using the.

Further, FIG. 5 shows a determination unit 51 according to the present invention.
FIG. As shown in the figure, the determination unit 51 of the present invention
Is composed of a reference data storage unit 53, a recognition code determination unit 54, a comparison determination unit 55, an output unit 56, and a control unit 57.

The reference data storage unit 53 is for inputting and storing the reference data 97a obtained in advance, and is composed of a recording device such as a ROM and a hard disk (not shown). Further, the recognition code determination unit 54 inputs a recognition code 98 of an inspection target (not shown), extracts reference data 97b matching the recognition code 98, and outputs the reference data 97c to the comparison determination unit 55 as reference data 97c. It is composed of a well-known electric circuit (not shown) or a program stored in a ROM or the like.

Further, the comparison / judgment unit 55 includes the frequency extraction unit 5
2. Inspection data 99 obtained from 2 and the recognition code determination unit 5
After inputting the reference data 97c output from FIG. 4, the comparison result of the inspection data 99 and the reference data 97c is output to the output unit 56, and a program stored in a well-known electric circuit (not shown), ROM, or the like. Etc. The output unit 56 outputs the result output from the comparison determination unit 55 to the external device (not shown) as the determination data 100, and includes a well-known interface device (not shown).

Further, the control unit 57 includes a reference data storage unit 5
3, which controls or processes the recognition code determination unit 54, the comparison determination unit 55, and the output unit 56, and includes a well-known microcomputer (not shown), a program stored in a ROM, and the like.

The frequency extraction unit 52 shown in FIG. 1 is composed of a simple electric circuit having a well-known filter circuit (not shown) capable of extracting only a predetermined frequency.
When a personal computer is used as the determination unit 51, the personal computer as the determination unit 51 and the frequency extraction unit 52 composed of an electric circuit are connected by a well-known interface device (not shown).

As described above, the determiner 51 receives the amplified signal transmitted from the amplifier 7 and then extracts a predetermined frequency. Based on the obtained signal, the varistor 4 disposed inside the motor 2 is defective. It is possible to determine whether or not the motor 2 is defective by determining at least one of the presence or absence of a defective item.

Next, a motor inspection method for determining at least one of the defect of the varistor 4 arranged inside the motor 2 and the presence / absence of a missing item by using the above-mentioned equipment will be described with reference to FIG.
This will be described with reference to the block diagram shown in FIG.

As shown in FIG. 6, in the motor inspection method of the present invention, a preparatory step 93 for acquiring information necessary for the inspection.
Then, it is roughly divided into an inspection stage 94 in which an actual inspection is performed using information necessary for this inspection. The preparation stage 93 and the inspection stage 94 will be described below.

First, in the preparatory step 93, the frequency characteristic is measured (step S1). FIG. 7 shows a frequency characteristic measuring method according to the present invention using a block diagram. As shown in the figure, in the measurement of frequency characteristics, a well-known function generator 66 is used for a motor 62 as a sample, a random noise voltage as pseudo noise is applied to the power line 65, and the well-known function generator 66 is installed on the power line 65. Frequency of 0 Hz to 100 KH using the current probe 71 of
The frequency characteristic of the current / voltage transfer function at z is measured. A well-known FFT analyzer (not shown) is used for the waveform measurement, and the measurement result indicated by reference numeral 67 is obtained.

Here, the motor 62 used as a sample has a good varistor 64 disposed inside, a defective varistor 64, and a varistor 6.
The one that is out of stock is used.

Then, in the measurement result 67, the vertical axis 72
Indicates the current / voltage transfer function, and the horizontal axis 73 indicates the frequency. Further, the measurement result A indicates that the varistor 64 is a non-defective product, the measurement result B indicates that the varistor 64 is missing, and the measurement result C indicates that the varistor 64 is missing.

Then, as shown in the measurement result 67, the current / voltage transfer function when the varistor 64 is a good product and when the varistor 64 is missing or when the varistor 64 is missing is It exhibits different frequency characteristics. This is because the motor 62 has an LCR circuit (not shown) including the varistor 64 therein, as described above, and when the varistor 64 is missing or missing, the capacitance of the varistor 64 is reduced. This is because the impedance of the entire LCR circuit changes due to the change.

Further, in the motor 62 as a sample in one embodiment of the present invention, the measurement result A shows good frequency characteristics at a frequency of 60 KHz or higher, and the measurement results B and C show that the frequency is 60 KHz or higher. Does not show frequency characteristics. Especially, compared with the measurement result B or the measurement result C, the measurement result A has a frequency of 80 KH.
Above z, there is a remarkable frequency characteristic that the difference between the current and voltage transfer functions of the motor 62 becomes large.

As described above, the frequency characteristic of FIG. 6 is measured (step S1), and the frequency characteristic of the current / voltage transfer function is obtained for the motor 62 as a sample.

Next, the applied noise frequency shown in FIG. 6 is determined (step S2). In the determination of the applied noise frequency, as shown in FIG. 7, the current / voltage transfer functions are compared when the varistor 64 is missing or when the varistor 64 is missing and when the varistor 64 is good. By doing so, the frequency at which a predetermined difference is obtained in the compared current / voltage transfer functions is obtained so that the varistor 64 can be recognized as a good product.

Here, depending on the state of the varistor 64 arranged inside the motor 62, the impedance of the LCR circuit (not shown) including the varistor 64 is set to the armature 6.
3 may change depending on the rotation angle, and the frequency characteristics of the current / voltage transfer function may change.

Therefore, it will be described below that the impedance of the LCR circuit (not shown) including the varistor 64 changes according to the rotation angle of the armature 63.

FIGS. 8 to 13 show the motor 62a, the varistor 64 in each state of non-defective product, defective product, and missing product, and the armature 63 at a predetermined rotation angle. The motor 62b, the motor 62c,
Shown as a motor 62d.

FIG. 8A shows the internal structure of the motor 62a. As shown in the figure, the varistor 64a-1, 64a-2, 64a-3 arranged on the armature 63a are all good products. FIG. 8B shows an equivalent circuit for the motor 62a. The motor 62a includes windings 75a-1, 75a-2, 75a-3 and a varistor 64a.
-1, 64a-2, 64a-3.

The motor 62a has an armature 63a.
Winding 75a-1, 75a-2, 75a-3
The impedance does not change because there is no change in the LCR circuit composed of the combination of the varistor 64a-1, 64a-2, and 64a-3.

FIG. 9A shows the internal structure of the motor 62b. As shown in the figure, among the varistor 64b-1, 64b-2, 64b-3 arranged in the armature 63b, the varistor 64b-2 is defective. In addition, FIG.
(B) shows an equivalent circuit for the motor 62b. The motor 62b has windings 75b-1, 75b-2, 7
5b-3 and varistors 64b-1, 64b-2, 64b-
It consists of 3 combinations.

FIG. 10 shows the internal structure of the motor 62b when the armature 63b in FIG. 9 rotates in the P direction by a predetermined angle. As shown in FIG. 10A, as the armature 63b rotates, the varistor 64b-
The positions of 1, 64b-2, 64b-3 have changed compared to FIG. 9 (a). Further, as shown in FIG. 10B, an equivalent circuit of a motor 62b including windings 75b-1, 75b-2, 75b-3 and varistors 64b-1, 64b-2, 64b-3 is also shown. 9 (b), which is changed.

Therefore, in the case of the motor 62b, when the armature 63b rotates, the windings 75b-1, 75b-2, 7
5b-3 and varistors 64b-1, 64b-2, 64b-
Since the LCR circuit composed of the combination of 3 changes, the impedance changes.

FIG. 11A shows the internal structure of the motor 62c. As shown in the figure, the varistors 64c-1, 64c-2 among the varistors 64c-1, 64c-2, 64c-3 arranged in the armature 63c are defective. Further, FIG. 11B shows an equivalent circuit of the motor 62c, and the motor 62c has a winding 75c-
1, 75c-2, 75c-3 and varistor 64c-1, 6
It consists of a combination of 4c-2 and 64c-3.

FIG. 12 shows the internal structure of the motor 62c when the armature 63c in FIG. 11 rotates in the P direction by a predetermined angle. As shown in FIG. 12A, the varistor 64c is rotated along with the rotation of the armature 63c.
The positions of -1, 64c-2, and 64c-3 are shown in FIG.
Has changed compared to. Further, as shown in FIG. 12B, an equivalent circuit of a motor 62c including windings 75c-1, 75c-2, 75c-3 and varistors 64c-1, 64c-2, 64c-3 is also shown. 11 (b), which is changed.

Therefore, in the case of the motor 62c, when the armature 63c rotates, the windings 75c-1, 75c-2, 7
5c-3 and varistors 64c-1, 64c-2, 64c-
Since the LCR circuit composed of the combination of 3 changes, the impedance changes.

FIG. 13A shows the internal structure of the motor 62d. As shown in the figure, the varistor is not provided in the armature 63d and is missing. In addition, FIG.
(B) shows an equivalent circuit for the motor 62d. The motor 62d has windings 75d-1, 75d-2, 7
It consists of a combination of 5d-3.

The motor 62d has an armature 63d.
Winding 75d-1, 75d-2, 75d-3
The impedance does not change because no change occurs in the LR circuit composed of the combination of.

As described above, the motor 62 in FIG.
Depending on the state of the varistor 64 arranged therein, the impedance of an LCR circuit (not shown) including the varistor 64 may change according to the rotation angle of the armature 63, and the frequency characteristic of the current / voltage transfer function may change. Can be considered. Therefore, in order to determine the applied noise frequency, it is necessary to consider that the impedance of the LCR circuit including the varistor 64 changes according to the rotation angle of the armature 63.

In FIG. 14, the results of measuring the frequency characteristics of the current-voltage transfer function at frequencies of 0 Hz to 100 KHz are measured for the motor 62a, motor 62b, motor 62c, and motor 62d shown in FIGS. Results are shown as 77.

As shown in FIG. 14, in the measurement of the frequency characteristic, the motor 62a, the motor 62b, the motor 62c, and the motor 62d as the samples are randomized as pseudo noise on the power line 65 by using the well-known function generator 66. A noise voltage is applied, and the frequency characteristic of the current / voltage transfer function is measured using a known current probe 71 installed on the power line 65. Also, for waveform measurement,
Using a well-known FFT analyzer (not shown), reference numeral 77
The measurement result shown in is obtained.

Here, the measurement result a is the frequency characteristic of the motor 62a shown in FIG. 8, the measurement result b-1 is the frequency characteristic of the motor 62b shown in FIG. 9, and the measurement result b-2 is the figure. The frequency characteristics and measurement result c-1 of the motor 62b shown in FIG.
2c shows the frequency characteristics and measurement result c-2 of FIG.
The frequency characteristic of the motor 62c and the measurement result d shown in FIG. 13 indicate the frequency characteristic of the motor 62d shown in FIG. 13, respectively.

As shown in FIG. 14, in the measurement result a, the current / voltage transfer function rises when the frequency is 60 KHz or higher. On the other hand, measurement result b-1, measurement result c-2,
The measurement result d has a frequency of 60 KHz or more, and these current / voltage transfer functions do not rise. Therefore, it can be said that the current / voltage transfer function of the motor 62a shown in the measurement result a shows good frequency characteristics at frequencies of 60 KHz or higher. Especially, the measurement result a shows that the frequency is 80K.
It shows a remarkable frequency characteristic that the current / voltage transfer function rises even above Hz.

The measurement result c-1 has a frequency of 60K.
Although the current / voltage transfer function rises above Hz, this current / transfer function is lower than the current / transfer function of the measurement result a.

Therefore, the frequency of the random noise voltage is 6
At 0 KHz or more, when the varistor 64 is missing or when the varistor 64 is missing, the varistor 6
By comparing the current / voltage transfer functions when 4 is a good product, it is possible to determine whether the varistor 64 is a good product.

However, comparing the frequency characteristics of the measurement result a and the measurement result b-2, when the frequency is 60 KHz or less,
The current-voltage transfer functions of both are almost the same, but at a frequency of 60 KHz or higher, the current-voltage transfer function of the measurement result a is slightly larger than the current-voltage transfer function of the measurement result b-2. It can be said that the frequency characteristics of both current and voltage transfer functions are similar.

As described above, when the frequency characteristics of the current / voltage transfer functions to be compared are similar to each other, it is difficult to determine whether or not the varistor 64 is defective. Therefore, it is necessary to rotate the armature 63.

Therefore, as shown in FIG. 6, the armature rotating work is performed (step S7). In the armature rotating work, the armature 63b is rotated from the position shown in FIG. 10 to the position shown in FIG.

By thus rotating the armature 63 to the position shown in FIG. 9, the measurement result b in FIG.
-1 can be obtained, and it can be recognized that the varistor 64 is a good product.

Therefore, in the motor inspection method of the present invention, when inspecting the motor 2 to be inspected in FIG. 1, it is necessary to rotate the armature 3 at least once or more to determine the applied noise frequency. .

In this embodiment, it is determined whether the varistor 64 in FIG.
Although it is possible to use KHz or higher, the frequency is determined to be 95 KHz for more accurate determination.

Next, as shown in FIG. 6, the frequency characteristic is confirmed (step S3). The confirmation of the frequency characteristic is the final confirmation in the preparatory step 93 of the motor inspection method according to the present invention. When the varistor 64 shown in FIG. 14 is missing, the current / voltage transfer function or the varistor 64 is missing. By comparing the current / voltage transfer function of the above and the current / voltage transfer function when the varistor 64 is a non-defective product, it is possible to recognize that the varistor 64 is a non-defective product. Is obtained.

FIG. 15 shows the measured value at the frequency of 95 KHz in the measurement result 77 shown in FIG. In FIG. 15, the vertical axis 91 represents the current / voltage transfer function, and the horizontal axis 92 represents the measurement result a, the measurement result b-1, the measurement result b-2, the measurement result c-1, and the measurement shown in FIG. The result c-2 and the measurement result d are shown as items.

As shown in FIG. 15, when the current / voltage transfer function of the measurement result b-2 is the measurement value 22, the measurement value 21 and the measurement result b-2 of the current / voltage transfer function of the measurement result a.
Since the difference between the measured value 22 of the current / voltage transfer function of 6 is small, any of the varistor 64b-1, 64b-2, 64b-3 provided in the motor 62b shown in FIGS. 9 and 10 is defective. It is difficult to judge.

However, when the current / voltage transfer function of the measurement result b-1 is the measured value 23, the measured value 21 of the current / voltage transfer function of the measurement result a and the current / voltage transfer function of the measurement result b-2. The difference from the measurement result 23 is large. Therefore, the varistor 64b− provided in the motor 62b shown in FIGS.
It can be determined that any one of 1, 64b-2, and 64b-3 is a defective product.

Since the difference between the measured value 21 of the current / voltage transfer function of the measurement result a and the measured values 24 and 25 of the current / voltage transfer function of the measurement results c-1 and c-2 is large,
It is possible to determine that any of the varistor 64c-1, 64c-2, 64c-3 included in the motor 62c shown in FIGS. 11 and 12 is defective.

Similarly, since the difference between the measured value 21 of the current / voltage transfer function of the measurement result a and the measured value 26 of the current / voltage transfer function of the measurement result d is large, the motor 6 shown in FIG.
It is possible to determine that any of the varistor (not shown in the figure) provided in 2d is defective.

Next, as shown in FIGS. 1 and 6, an inspection step 94 in the motor inspection method of the present invention is performed.

First, the current / voltage transfer characteristic is measured (step S4). When measuring the current-voltage characteristics,
As shown in, the power line 5 of the motor 2 to be inspected
The DC power supply 13 is connected to a and 5b, and the AC current generator 12 is connected in parallel with the DC power supply 13. And power line 5
An alternating current converter 6 is connected to a and 5b, and a determiner 9 is connected to the alternating current converter 6 via an amplifier 7. In this way, the current / voltage transfer function of the motor 2 is measured.

Here, in the measurement, in order to rotate the armature 3, a DC voltage is applied to the power lines 5a and 5b by using the DC power supply 13. The applied voltage is the armature 3
In order to drive the motor at a low speed, the minimum rating of the motor 2 is preferable. Further, while the armature 3 is rotating, the AC generator 12 is used to apply an AC voltage as pseudo noise to the power lines 5a and 5b. For the AC frequency as the pseudo noise, the applied noise frequency in FIG. 6 is determined (step S
Use the frequency obtained in 2). Then, the noise superimposed on the power line 5b during at least one rotation of the armature 3 is measured by the AC current converter 6.

In the motor 2 according to the embodiment of the present invention, the DC voltage is DC5V and the AC voltage is AC20.
It was set to V. In addition, the AC frequency is the same as the preparatory step 9 shown in FIG.
AC 95 KHz as determined in the determination of the applied noise frequency of step 3 (step S2). Then, as described above, the current / voltage transfer characteristic in one rotation of the armature 3 is measured in consideration of the impedance change of the LCR circuit (not shown) including the varistor 4. The armature 3 is
Since the rotation is not stable immediately after the activation, the measurement is started 0.5 seconds after the armature 3 is activated. The measurement time is 0.5 seconds.

Further, as shown in FIG. 1, the measurement is carried out by amplifying the signal obtained from the alternating current converter 6 connected to the power line 5b by the amplifier 7 and determining the amplified signal obtained by the amplifier 7 by the judging device. Enter in 9. In the motor inspection method of the present invention,
A well-known personal computer may be connected to the determiner 9 and the measurement result may be displayed on the display 10.

FIG. 16 shows time-series data of the current / voltage transfer function regarding the motor 2 when the varistor 4 in FIG. 1 is a good product. In FIG. 16, the vertical axis 83
Shows the alternating current value obtained from the alternating current converter 6, and the horizontal axis 84 shows time. As shown in the figure, the noise waveform 89 of AC 95 KHz can be continuously observed in the measurement.

FIG. 17 shows time-series data of the current / voltage transfer function regarding the motor when the varistor in FIG. 1 is defective. In FIG. 17, the vertical axis 85 shows the AC current value obtained from the AC current converter 6, and the horizontal axis 8
6 indicates time. As shown in the figure, in the measurement, A
A noise waveform 90 of C95 KHz is observed intermittently.

This is because, as shown in FIG. 2, the motor 2 includes an LCR circuit (not shown) composed of the inductor 17, the varistor 4 and the resistor 18.
This is because, if there is a defect or a missing item, the capacitance of the varistor 4 changes and the impedance of the entire LCR circuit changes.

As for the motor when the varistor 4 in FIG. 1 is missing, the AC95 is the same as in FIG.
A noise waveform 90 of KHz is observed intermittently.

Next, the averaging process shown in FIG. 6 is performed (step S5). In the averaging process, a predetermined frequency component is extracted from the measurement signal obtained in the measurement of the current / voltage transfer characteristic (step S4), and the extracted component is averaged by a known method. In one embodiment of the present invention,
If a personal computer is used as the determiner 9 in FIG. 1 and the well-known personal computer FFT analyzer software is installed in the frequency extraction unit 52, the process of extracting and averaging a predetermined frequency component of the input signal is easy. Can be done.

In the embodiment of the present invention, as described above, the noise waveform 8 of AC 95 KHz of the motor 2 is used.
Since it is measuring 9, 90, this noise waveform 89, 9
An averaging process of 0 is performed.

Next, as shown in FIG. 6, the varistor non-defective product determination is performed (step S6). Hereinafter, the varistor non-defective product determination will be described with reference to FIGS.

First, as shown in FIG. 18, an identification code of an object to be inspected (not shown) is input (step S).
8). As the recognition code input, as shown in FIG. 5, a recognition code 98 obtained by a known method such as keyboard input or bar code input is input to the recognition code determination unit 54. The recognition code 98 is determined by comparing it with a stored recognition code (not shown) previously obtained by the recognition code determination unit 54.

When the recognition code judging section 54 cannot normally recognize the object to be inspected (not shown), a predetermined display is displayed on the display 10 shown in FIG. It is desirable to encourage operation. Then, when this inspector can make a predetermined input using the input device 11, the recognition code 98 may be determined again as shown in FIG.

Next, as shown in FIG. 18, reference data is read (step S9). As shown in FIG. 5, the reference data is read by the reference data 97a obtained in advance.
The predetermined reference data 97b that matches the recognition code 98 is extracted from the reference data storage unit 53 in which is stored and is sent to the comparison determination unit 55 as the reference data 97c.

It should be noted that although the recognition code judging section 54 can recognize an object to be inspected (not shown), the reference data 9
If 7b is not obtained, it is necessary to measure the frequency characteristic (step S1) in the preparatory step 93 shown in FIG.

Next, as shown in FIG. 18, inspection data is read (step S10). As shown in FIG. 5, the reading of the inspection data is performed by inputting the inspection data 99 which is the current / voltage transfer characteristic of the inspection target, which has been averaged by the frequency extraction unit 52.

Next, as shown in FIG. 18, varistor non-defective product determination is performed (step S11). FIG. 19 shows a method for determining a non-defective varistor. In the inspection result 78 in FIG. 19, the vertical axis 87 represents the current / voltage transfer function. Further, the horizontal axis 88 indicates the reference data item 79 and the inspection data items 80a and 80b to be inspected. The horizontal axis 88 is, for example, the inspection data A obtained for the motor 2 in the case where the varistor 4 in FIG. 1 is missing, and the motor 2 in the case where the varistor 4 in FIG. 1 is missing. The obtained inspection data B is shown.

As shown in FIG. 19, the reference value 95 obtained in advance and the inspection values 96a and 96b obtained from the object to be inspected.
Is compared to determine whether or not the varistor 4 in FIG. 1 is a good product. Here, as the reference value 95, the inspection standard obtained in the confirmation of the frequency characteristic shown in FIG. 6 (step S3), that is, the frequency characteristic of the current / voltage transfer function of the motor 62a shown in FIG. 7 is used.

Further, as shown in FIG. 19, the threshold value 97 is
A current that is set arbitrarily from the reference value 95 and that has a threshold value of 97 or more.
An object to be inspected having a voltage transfer characteristic can be determined to be a non-defective varistor 4 shown in FIG. On the other hand, the object to be inspected having the current / voltage transfer characteristic equal to or less than the threshold value 97 shown in FIG. 19 can be determined to have the varistor 4 shown in FIG. 1 missing or missing.

As described above, the varistor non-defective product determination (step S11) in FIG. 18 is performed, and the motor inspection method shown in FIG. 6 ends.

In the embodiment of the present invention, as described above, the judging section 51 in FIG. 1 is composed of a known electric circuit, and as shown in FIG. 18, whether the object to be inspected is a good product or not. The determination process can be performed by a series of processes.

Further, it is desirable that the inspection result 78 shown in FIG. 19 is displayed on the display 10 in FIG. 1 or a personal computer (not shown) so that an inspector (not shown) can confirm it. Further, the judging device 9
In addition, it may be configured to notify an inspector (not shown) of the determination result by a well-known buzzer or the like.

Next, the motor manufacturing method according to the present invention will be described. FIG. 20 is a block diagram showing one embodiment of the motor manufacturing method according to the present invention.

First, the motor is assembled (step S
12). In the motor assembly process, the motor 2 shown in FIG. 1 is assembled by a known method. At this time, depending on the required specifications of the motor 2, the varistor 4 may not be provided in the armature 3 from the beginning.

Next, a motor inspection is performed (step S1).
3). In the motor inspection process, the motor 2 shown in FIG. 1 assembled in the assembly process is inspected. In the inspection process, the inspection as described above is performed. Therefore, even in the inspection process, which is a post-process after assembly, it is possible to determine at least one of the defect of the varistor 4 arranged inside the motor 2 to be inspected and the presence / absence of a missing item.

As described above, according to the motor inspection device of the present invention,
Since the measurement of the alternating current waveform using the alternating current converter 6 is performed during at least one rotation of the armature 3,
At least one of the defect of the varistor 4 and the presence or absence of the missing product can be determined in a short time.

Further, the AC voltage applied from the AC generator 12 to the DC power supply connecting portion is several tens of kHz, and noise is not generated on other adjacent inspection lines, so that the inspection accuracy is lowered. It is possible to determine at least one of the defect of the varistor 4 and the presence / absence of a missing item without performing the above.

Further, since the AC generator 12, the AC current converter 6, the amplifier 7, and the judging device 9 are general equipment,
It is possible to determine at least one of the defect of the varistor 4 and the presence / absence of a missing item without using an expensive device such as a line filter or a spectrum analyzer.

According to the motor inspection method of the present invention,
As shown in FIG. 1, since the measurement of the alternating current waveform for determining at least one of the varistor 4 defect and the absence or absence of the varistor 4 is performed during at least one rotation of the armature 3, the varistor 4 is measured in a short time. It is possible to determine at least one of a missing item and the presence or absence of a missing item.

Further, the AC voltage applied to the DC power supply connecting portion in order to determine at least one of the lack of the varistor 4 and the presence / absence of the missing product is several tens of kHz, and noise is generated in other adjacent inspection lines. Since there is no influence due to the occurrence, it is possible to determine at least one of the defect of the varistor 4 and the presence / absence of a missing item without lowering the inspection accuracy.

Further, the measuring instruments used for determining at least one of the varistor 4 defect and the absence / presence of the varistor 4 are general instruments such as the AC generator 12, the AC current converter 6, the amplifier 7, and the determination. The container 9 is used. Therefore, it is possible to determine at least one of the defect of the varistor 4 and the presence / absence of a missing item without using an expensive device such as a line filter or a spectrum analyzer.

According to the motor manufacturing method of the present invention,
Since the measurement of the AC current waveform for determining at least one of the varistor 4 defect and the presence or absence of the varistor in the inspection step is performed during at least one rotation of the armature 3, the varistor 4 is deficient or deficient in a short time. It is possible to determine at least one of the presence or absence of.

Further, the AC voltage applied to the DC power supply connecting portion in order to determine at least one of the varistor 4 defect and the absence / presence of the defective product is several tens of kHz, and noise is generated in other adjacent inspection lines. Since there is no influence due to the occurrence, it is possible to determine at least one of the defect of the varistor 4 and the presence / absence of a missing item without lowering the inspection accuracy.

Further, the measuring instruments used for determining at least one of the loss of the varistor 4 and the presence / absence of a missing item include an AC generator 12, an AC current converter 6, an amplifier 7, and a determination which are general instruments. The container 9 is used. Therefore, it is possible to determine at least one of the defect of the varistor 4 and the presence / absence of a missing item without using an expensive device such as a line filter or a spectrum analyzer.

In this way, even after the motor 2 is assembled, it is possible to determine at least one of the varistor 4 arranged inside the motor 2 and whether or not the varistor 4 is missing. Missing motor 2
Can be prevented from being shipped as a product.

The embodiment of the present invention may be modified as follows. In the above embodiment, the motor inspection device 1 of the present invention shown in FIG. 1 is not fixed to the inspection line of the motor 2 but is a handy type, and it is desirable that it can be freely carried. As described above, by being portable, it is possible to inspect, for example, a power window motor, a wiper motor, and a sunroof motor that are already installed in an automobile according to the procedure shown in FIG. By doing so, it is possible to perform regular inspections of the automobile.

In the above embodiment, the determination unit 51 is
It may be possible to further determine whether the varistor 4 is defective or lacking. That is, as shown in FIGS. 14 and 15, when the varistor 64 provided in the motor 62 is missing, even if the armature 63 rotates, the current / voltage transfer function at the predetermined frequency of the motor 62 is Although not changing, when the varistor 64 is missing, the current / voltage transfer function of the motor 62 changes according to the rotation of the armature 63.

Therefore, when the value is lower than the current / voltage transfer function as the reference value and the current / voltage transfer function fluctuates when the armature 63 is rotated, the varistor 64 is said to be defective. Can be determined.

Similarly, when the value is lower than the reference current / voltage transfer function and the current / voltage transfer function does not change when the armature 63 is rotated, all the varistor 64 is out of stock. It can be determined that

In the above embodiment, the DC power supply 13 does not have to be used to rotate the armature 3 when it is determined whether or not the varistor 64 shown in FIG. That is, the armature 3 may be rotated so that the output shaft 19 directly connected to the armature 3 is brought into contact with a predetermined jig, a rotating device, or the like.

[0132]

As described above, according to the motor inspection device of the present invention, the measurement of the alternating current waveform using the alternating current converter is performed during at least one revolution of the armature.
At least one of varistor deficiency and presence / absence of varistor can be determined in a short time.

Further, the AC voltage applied from the AC generator to the DC power supply connecting portion is several tens of kHz, which does not affect other adjacent inspection lines due to the noise generation, so that the inspection accuracy is lowered. It is possible to determine at least one of the varistor defect and the absence / presence of a missing item without the need.

Furthermore, since the AC generator, AC current converter, amplifier, and decision unit are general equipment, varistor defects and missing parts can be removed without using expensive equipment such as line filters and spectrum analyzers. At least one of the presence and absence can be determined.

According to the motor inspection method of the present invention,
Since the measurement of the AC current waveform to determine at least one of the varistor defect and the absence or absence of the product is performed during at least one rotation of the armature, at least one of the varistor defect and the presence or absence of the missing product is performed in a short time. Can be determined.

Further, the AC voltage applied to the DC power supply connecting portion in order to determine at least one of the lack of the varistor 4 and the presence / absence of the missing product is several tens of kHz, and noise is generated in other adjacent inspection lines. Since there is no influence due to the occurrence, it is possible to determine at least one of the varistor defect and the absence / presence of the varistor without lowering the inspection accuracy.

Furthermore, the measuring instruments used for determining at least one of the varistor defect and the absence / presence of the varistor include an ordinary generator such as an AC generator and an AC current converter.
An amplifier and a determiner are used. Therefore, it is possible to determine at least one of the varistor defect and the absence or absence of the varistor without using an expensive device such as a line filter or a spectrum analyzer.

According to the motor manufacturing method of the present invention,
In the inspection process, the measurement of the AC current waveform to determine at least one of the varistor defect and the presence / absence of the missing product,
Since it is performed during at least one revolution of the armature, it is possible to determine at least one of the varistor defect and the absence or absence of the varistor in a short time.

Further, the AC voltage applied to the DC power supply connecting portion for determining at least one of the varistor defect and the absence / presence of the defective product is several tens of kHz, and noise is generated in another adjacent inspection line. Therefore, it is possible to determine at least one of the varistor defect and the absence / presence of a missing item without lowering the inspection accuracy.

Further, the measuring instruments used for determining at least one of the varistor defect and the absence / presence of the varistor include an AC generator, an AC current converter, which is a general instrument.
An amplifier and a determiner are used. Therefore, it is possible to determine at least one of the varistor defect and the absence or absence of the varistor without using an expensive device such as a line filter or a spectrum analyzer.

Thus, even after the motor is assembled,
Since it is possible to determine whether the varistor installed inside the motor is defective or missing, it is possible to prevent the shipment of a varistor missing or missing motor as a product. You can

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of a motor inspection device according to the present invention.

FIG. 2 is an internal configuration diagram of the motor according to the embodiment of the present invention.

FIG. 3 is a main part configuration diagram of a current probe according to an embodiment of the present invention.

FIG. 4 is an overall configuration diagram of an AC sensor according to an embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of a determination unit according to an embodiment of the present invention.

FIG. 6 is a block diagram showing an embodiment of a motor inspection method according to the present invention.

FIG. 7 is a diagram showing measurement of frequency characteristics of a motor according to an embodiment of the present invention.

FIG. 8A is an internal configuration diagram of a motor according to an embodiment of the present invention, and FIG. 8B is a diagram showing an equivalent circuit diagram of the motor.

9A is an internal configuration diagram of a motor according to an embodiment of the present invention, and FIG. 9B is an equivalent circuit diagram of the motor.

FIG. 10A is an internal configuration diagram of a motor according to an embodiment of the present invention, and FIG. 10B is an equivalent circuit diagram of the motor.

11A is an internal configuration diagram of a motor according to an embodiment of the present invention, and FIG. 11B is a diagram showing an equivalent circuit diagram of the motor.

12A is an internal configuration diagram of a motor according to an embodiment of the present invention, and FIG. 12B is an equivalent circuit diagram of the motor.

FIG. 13A is an internal configuration diagram of a motor according to an embodiment of the present invention, and FIG. 13B is an equivalent circuit diagram of the motor.

FIG. 14 is a diagram showing measurement of frequency characteristics of a motor according to an embodiment of the present invention.

FIG. 15 is a measurement result of frequency characteristics of the motor according to the embodiment of the present invention.

FIG. 16 is a diagram showing time-series data of a current / voltage transfer function regarding a motor according to an embodiment of the present invention.

FIG. 17 is a diagram showing time-series data of a current / voltage transfer function regarding a motor according to an embodiment of the present invention.

FIG. 18 is a block diagram showing a determination method according to an embodiment of the present invention.

FIG. 19 is a measurement result of frequency characteristics of the motor according to the embodiment of the present invention.

FIG. 20 is a block diagram showing an embodiment of a motor manufacturing method according to the present invention.

FIG. 21 is an overall configuration diagram of a motor inspection device that is an embodiment of a conventional motor inspection method.

[Explanation of symbols]

1 inspection device, 2 motor, 3 armature, 4 varistor, 5a, 5b power line, 6 alternating current converter, 7
Amplifier, 8 signal cable, 9 judging device, 10 indicator,
11 input device, 12 AC generator, 13 DC power supply, 1
4a, 14b brushes, 15 windings, 16 commutators, 17 inductors, 18 resistors, 21, 22, 2
3,24,25,26 Measured value, 31,71 Current probe, 32,42 Upper clamp, 33,43 Lower clamp, 34,44 Clamp hole, 35 Coil part, 36,4
6 output unit, 41 AC sensor, 45a, 45b Hall element, 51 determination unit, 52 frequency extraction unit, 53 reference data storage unit, 54 recognition code determination unit, 56 output unit, 57 control unit, 62, 62a to 62d motor, 6
3, 63a to 63d armature, 64, 64a-1 to
64a-3, 64b-1 to 64b-3, 64c-1 to 6
4c-3 Varistor, 65 power line, 66 function generator, 67, 77 measurement result, 72, 81,
83,85,87,91 Vertical axis, 73,82,84,8
6, 88, 92 horizontal axis, 75a-1 to 75a-3, 75
b-1 to 75b-3, 75c-1 to 75c-3, 75d
-1 to 75d-3 winding, 78 inspection result, 79 reference data item, 80a, 80b inspection data item, 89, 9
0 noise waveform, 93 preparation stage, 94 inspection stage, 9
5 standard values, 96a, 96b inspection values, 97a-97c
Reference data, 98 recognition code, 99 inspection data, 1
00 determination data, 101 inspection device, 102 motor, 103 armature, 104 varistor, 105
a, 105b power line, 106 line filter, 108
Signal cable, 110 indicator, 113 DC power supply

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takashi Shinkai             Asumo Stock Association, 390 Umeda, Kosai City, Shizuoka Prefecture             In-house F term (reference) 2G014 AA02 AB07 AB49 AB51 AC18                 2G016 BA04 BB01 BB02 BC06 BD06                       BD07                 5H615 AA01 AA05 BB01 BB04 PP02                       PP14 SS57

Claims (3)

[Claims] 1. An inspection device for a motor in which a varistor is arranged on an armature, wherein an AC generator for applying a predetermined AC voltage to a DC power supply connection portion of the motor, and the at least one revolution of the armature. By comparing an alternating current converter that measures an alternating current waveform of a direct current power supply connection with a voltage-current characteristic obtained from the alternating-current converter and a predetermined reference voltage-current characteristic, the varistor defect and the missing item A motor inspecting device, comprising: a determiner that determines at least one of presence and absence. 2. A method of inspecting a motor in which a varistor is arranged on an armature, wherein a predetermined AC voltage is applied to a DC power supply connection portion of the motor, and the DC power supply connection portion is present during at least one rotation of the armature. Measuring at least one of the alternating current waveforms and comparing the voltage-current characteristic obtained from the alternating current waveform with a predetermined reference voltage-current characteristic to determine at least one of the varistor defect and the presence / absence of a missing item. The characteristic motor inspection method. 3. A method of manufacturing a motor having a DC power supply connecting portion and an armature provided with a varistor, wherein the motor is obtained by assembling a member including the DC power connecting portion, the varistor and the armature. An assembling step of assembling, applying a predetermined AC voltage to the DC power source connecting portion of the motor assembled in the assembling step, and measuring an AC current waveform of the DC power source connecting portion during at least one rotation of the armature, An inspection step of determining at least one of the varistor defect and the absence or absence of the varistor by comparing a voltage-current characteristic obtained from the AC current waveform with a predetermined reference voltage-current characteristic. Characteristic motor manufacturing method.