JP3695339B2 - Motor insulation tester - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an insulation inspection apparatus for inspecting insulation of a motor.
[0002]
[Prior art]
Because of the structure of the motor, the brush and the commutator are in contact with each other, so the brush wears out and wear powder scatters, causing this to occur between the motor case and other metal parts and the motor electrical system. Insulation may decrease. In addition, insulation may be deteriorated due to dust entering the motor after long-term use.
[0003]
Such a decrease in insulation may occur regardless of the type of a direct current (DC) motor or an alternating current (AC) motor, and causes a motor stop accident or a leakage accident. For this reason, it is necessary to inspect the insulation of the motor periodically or appropriately.
[0004]
As a conventional insulation test method, a method called a so-called mega test is used. For example, a high voltage is applied between the motor power line and the ground so that the motor is not destroyed. This is done by measuring the resistance value.
[0005]
[Problems to be solved by the invention]
However, in this method of applying a high voltage to the motor, it is necessary to completely separate the motor and the control device in order to prevent the high voltage from flowing into the motor control device.
[0006]
For this reason, the conventional insulation inspection requires a work for disconnecting the signal line and a connection work after the inspection every time the insulation inspection is performed, and there is a problem that the insulation inspection takes a very long time. .
[0007]
SUMMARY OF THE INVENTION An object of the present invention is to provide an insulation inspection device that can perform insulation inspection of a motor in a short time without separating the motor and the control device.
[0008]
[Means for Solving the Problems]
The object of the present invention is achieved by the following means.
[0009]
(1) A device for inspecting the insulation of a motor, which is insulated from a motor electrical wiring for supplying power to the motor, and is disposed in the vicinity of the motor electrical wiring; Electromotive force induced in the electric wiring for the motor by a charged body Voltage Measure Voltage And an insulating test apparatus.
[0010]
(2) A device for inspecting the insulation of the motor, the electric conductor electrically connected to the electric wiring for the motor for supplying electric power to the motor, the electric wiring for the motor, and the electric conductor A charged body that is insulated from the conductor and disposed in the vicinity of the conductor, and an electromotive force induced in the conductor by the charged body Voltage Measure Voltage And an insulating test apparatus.
[0011]
(3) The charged body is an AC electrical wiring through which an alternating current flows.
[0012]
(4) The AC electrical wiring is a power line that is wired along the motor electrical wiring and supplies power to the motor control device.
[0013]
(5) The charged body is an AC electrical wiring through which an alternating current flows, The conductor is a shield conductor that covers the AC electrical wiring.
[0014]
(6) The AC electrical wiring and the shield conductor covering the AC electrical wiring are housed in a grounded conductive case.
[0015]
(7) The voltage measuring means is connected to motor electrical wiring of a plurality of motors for each relay through a plurality of relays.
[0016]
(8) The insulation test apparatus according to claim 2, wherein the conductor is connected to electric wiring for a motor of a plurality of motors for each relay through a plurality of relays.
[0017]
(9) The insulation test apparatus further includes the Voltage It has a display means for displaying the measurement result in a stepwise manner according to the measurement result of the measurement means.
[0018]
【The invention's effect】
According to the present invention described above, the following effects are obtained for each claim.
[0019]
According to the first aspect of the present invention, a charging body insulated from the electric wiring for the motor is arranged in the vicinity of the electric wiring for the motor for supplying electric power to the motor, and the electrostatic induction action by the charging body is provided. Electromotive force induced in the electrical wiring for the motor by the insulation state Voltage Since the insulation performance of the motor is inspected by measuring the above, there is no need to apply a high voltage to the motor case or electrical wiring as in the prior art. Therefore, it becomes unnecessary to separate the motor and the control device, and the insulation test can be easily performed in a short time.
[0020]
According to the second aspect of the present invention, a conductor is connected to the electric wiring for the motor for supplying electric power to the motor, and a charging body insulated from the electric wiring for the motor is arranged in the vicinity thereof, and this charging is performed. Electromotive force induced in the conductor according to the insulation state of the motor by electrostatic induction by the body Voltage Since the insulation performance of the motor is inspected by measuring the above, there is no need to apply a high voltage to the motor case or electrical wiring as in the prior art. Therefore, it becomes unnecessary to separate the motor and the control device, and the insulation test can be easily performed in a short time. Further, in the present invention, since the conductor is connected to the electric wiring for the motor and the charged body is arranged in the vicinity thereof, the insulation can be easily performed even in a place where the charged body cannot be placed in the vicinity of the electric wiring for the motor. It can be installed with a property inspection device to perform an insulation test.
[0021]
According to the third aspect of the present invention, since the electrical wiring in which alternating current flows is used as the charging body, the electrical wiring used in various electrical facilities can be used as it is, so that the insulation can be easily performed. A sex test can be performed.
[0022]
According to the fourth aspect of the present invention, since the power line for supplying power to the motor control device wired along the electric wiring for the motor is used as the charging body, no prior preparation is required, Insulation inspection can be performed easily.
[0023]
According to the fifth aspect of the present invention, since the shield conductor that covers the AC electric wiring is used for the conductor connected to the electric wiring for the motor, the insulation test can be easily performed by using a shielded electric wire or the like. Can make equipment.
[0024]
According to the sixth aspect of the present invention, since the AC electrical wiring and the shield conductor covering it are housed in the grounded conductive case, the electromagnetic field from the outside to the shield conductor causing the induced electromotive force is generated. The influence can be prevented.
[0025]
According to the seventh aspect of the present invention, the electric wiring for the motors of the plurality of motors via the relay Voltage Since the measuring means is connected, it is possible to easily inspect the insulation of a plurality of motors only by sequentially switching the relays.
[0026]
According to the eighth aspect of the present invention, since the electrical wiring for the motors and the conductors of the plurality of motors are connected via the relays, the insulation of the plurality of motors can be achieved only by sequentially switching the relays. Can be easily inspected.
[0027]
According to the present invention as set forth in claim 9, Voltage Since the display means for showing the measurement results of the measurement means in stages is provided, the insulation of the motor can be displayed in an easy-to-understand manner.
[0028]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.
[0029]
(First embodiment)
In the first embodiment, an induction is induced in a power line by applying an alternating current to a power line to a controller that is concentrated together with electric wiring for a motor (hereinafter referred to as a power line) that supplies power to a DC motor. The insulation of the DC motor is inspected from the voltage value of the electromotive force.
[0030]
FIG. 1 is a circuit diagram of a motor insulation test apparatus to which the present invention is applied.
[0031]
This device includes a buffer circuit 1, an operational amplifier circuit 2, a rectifier circuit 3, an amplifier circuit 4, and a determination circuit 5.
[0032]
The buffer circuit 1 is composed of an operational amplifier in order to detect only the voltage without drawing current, and has an internal resistance of about 1000 MΩ or more. This is for reliably detecting the electromotive force induced in the power line of the DC motor. The input terminal A of the buffer circuit 1 is connected to the power line of the DC motor, and the other terminal G is connected to the ground.
[0033]
The operational amplifier circuit 2 is a circuit for accurately amplifying the potential difference between the potential detected by the buffer circuit 1 and the ground potential.
[0034]
The rectifier circuit 3 converts the detected AC voltage (described in detail later) into a DC voltage. However, since the weak voltage is detected here, the voltage is attenuated when the voltage is converted into DC. In order to avoid this, an ideal diode configuration rectifier circuit using an operational amplifier is used.
[0035]
The amplifier circuit 4 is a circuit for amplifying the rectified DC voltage.
[0036]
The determination circuit 5 is a circuit for easily displaying the insulation performance with a plurality of threshold values according to the amplified voltage value. In this determination circuit 5, the setting of the resistors VR 1, 2, 3 causes the switching transistors Q 1, 2, 3 to be turned on according to the input voltage value, and one of the LEDs 1, 2, 3 is lit. ing. Here, depending on the setting of resistors VR1, 2, 3, LED1 is turned on when the motor insulation performance is less than 0.1MΩ (others are turned off), and LED2 is turned on when other than 0.1MΩ and less than 2MΩ (the others are turned off) ) When 3 MΩ or more, the LED 3 is turned on (the others are turned off). Each LED has a red LED 1, a yellow LED 2, a green LED 3, and the like, so that the insulation performance can be understood by the lighting color of each LED. In addition, the corresponding relays CR1, 2, 3 are turned on in accordance with the lighting of these LEDs 1, 2, 3, respectively. (Refer to the second embodiment to be described later)
Next, the operation in the first embodiment will be described.
[0037]
First, in this apparatus, as described above, the insulation is inspected by measuring the voltage of the induced electromotive force induced in the power line of the DC motor. As is well known, this induced electromotive force is generated by an electrostatic induction effect in an insulated conductor when a charged body is present near the insulated conductor.
[0038]
Therefore, in a DC motor, if the power input of a power line for supplying power to the motor is cut off and a charged body is brought close to the power line, An electromotive force is generated in the power line by electrostatic induction. And it turned out that the voltage value of the electromotive force by the electrostatic induction which generate | occur | produced in the power line in this way is proportional to the insulation state of a motor.
[0039]
This apparatus measures the voltage of the induced electromotive force generated in the power line of the DC motor. Incidentally, as described above, in order to cause electrostatic induction, a charged body must be placed in the vicinity of the power line. In the present embodiment, as a charged body for generating electrostatic induction, A power line for the motor control device arranged along the power line of the DC motor is used.
[0040]
This utilizes a concentrating method often used in ordinary factories. Since various electrical equipment is used in factories, etc., electrical wiring to these electrical equipment is indispensable, but there are various in terms of ease of maintenance work, ease of wiring, and prevention of electrical accidents. A method of collecting and wiring power lines to control equipment and signal lines for control has been adopted. Similarly, the power line of the DC motor, the power line of the control device, and the like are gathered and bound in one place. Therefore, the power line of the motor is cut off between the power line of the DC motor and the power source (normally, it is only necessary to switch off the motor), and power is supplied only to the motor control device. It can be electrostatically induced. In addition, since the power line of the control device is connected to a commercial power supply (AC 100 V), the electromotive force induced in the power line of the DC motor is also AC.
[0041]
Thus, the insulation of the DC motor can be easily inspected by electrostatically inducing the power line and connecting the inspection apparatus according to the first embodiment to the power line.
[0042]
FIG. 2 is a diagram showing the correlation between the result of inspecting insulation by a conventional method such as the mega test method and the voltage value (alternating current) measured by this apparatus. In FIG. 2, FIG. 2A shows a state with relatively good insulation, and FIG. 2B shows a state with poor insulation.
[0043]
FIG. 2 shows that the voltage value is proportional to the insulation value (resistance value). 2A shows that when the voltage value is 3 V or more, there is an insulating property of 10 MΩ or more. On the other hand, as shown in FIG. 2B, when the measured voltage is 1 V or less, the insulation value is 0.1 MΩ or less, which is a value requiring maintenance. As a result of the experiment, the voltage value measured when the insulation is infinite varies depending on the structure of the motor, the power line of the DC motor and the length of the power line of the control device arranged along the power line. The maximum value is about 8 to 10V.
[0044]
As described above, according to the present embodiment, it is possible to easily inspect the insulation of the DC motor only by measuring the induced electromotive force voltage generated in the power line of the DC motor. Therefore, since it is not necessary to apply a high voltage to the DC motor as in the prior art, there is no need for complicated preparations such as removing the signal line between the motor control device and the motor.
[0045]
(Second Embodiment)
In the second embodiment, the insulation of the plurality of DC motors can be more efficiently inspected by using the insulation inspection apparatus of the present invention in a factory equipped with the plurality of DC motors. It is a form.
[0046]
FIG. 3 is a diagram showing an equipment configuration for inspecting insulation of a plurality of DC motors.
[0047]
Here, the number of DC motors to be inspected is ten from the first motor 51 to the tenth motor 60. The input terminals A of the buffer circuit 1 of the insulation test apparatus 10 are connected to the power lines 71 to 80 of the DC motors 51 to 60 by lead wires through the relays SA1 to SA10, respectively.
[0048]
The insulation inspection apparatus 10 itself is exactly the same as that described as the first embodiment described above. However, the signals from the relays CR1, 2, and 3 of the determination circuit 5 are connected to the sequencer 90, and each sequencer 90 turns on and off the lamp of the display panel 100 that displays the operation state of the motor, for example. Insulation is understood for each motor.
[0049]
Since other configurations are the same as those of the first embodiment, description thereof is omitted. Further, the power lines of the motors are concentrated in the concentrator 110 along the power lines of the control devices of the motors.
[0050]
The operation in the second embodiment will be described.
[0051]
In the present embodiment, power is supplied only to the control device before power is supplied to the DC motor. In this state, an induced electromotive force is generated in the power line of each DC motor. Therefore, by sequentially switching the relays SA1 to SA10, the voltage value of the induced electromotive force generated in each of the power lines 71 to 80 is insulatively inspected. 10 is measured. The measured results indicate that the LEDs 1 to 3 in the determination circuit are in the same manner as in the first embodiment, depending on whether the insulation value is less than 0.1 MΩ, 0.1 or more and less than 2 MΩ, and 2 MΩ or more. A signal indicating that each LED is turned on is output to the sequencer 90. The sequencer 90 turns on the lamp of the display panel 100 for each DC motor measured from the signal output for each range of insulation values.
[0052]
Here, the switching of the relays SA1 to SA10 is controlled by a sequencer, so that it is possible to automate the insulation test of a plurality of DC motors almost completely.
[0053]
As described above, in the second embodiment, simply by connecting the lead wire through the relay for the insulation test in advance to the power line of the DC motor, the insulation test apparatus 10 can easily perform the insulation. Inspection can be performed. Therefore, it is possible to carry out an insulation inspection of each motor even before starting operation every day.
[0054]
(Third embodiment)
In the third embodiment, the insulation of the plurality of AC motors can be inspected by using the insulation inspection apparatus of the present invention in a factory equipped with the plurality of AC motors. .
[0055]
FIG. 4 is a diagram showing a facility configuration for inspecting insulation of a plurality of AC motors.
[0056]
Here, the inspection targets are a plurality of AC motors 251 and 252. An electrostatic induction voltage generator 201 (described later in detail) connected to the insulation test apparatus 10 is connected to the power lines U1 and U2 of the AC motors 251 and 252 via lead lines via relays SA1 and SA2, respectively. Yes. Note that the power line of the motor connecting the relays SA1 and SA2 is not limited to the illustrated power lines U1 and U2, and may be any one of the three-phase power lines U, V, and W.
[0057]
The insulation inspection apparatus 10 itself is exactly the same as that described as the first embodiment described above. However, the signals from the relays CR1, 2, and 3 of the determination circuit 5 are connected to the sequencer 90 as in the second embodiment described above, and the sequencer 90 displays, for example, a display panel that displays the operating state of the motor. By turning off and turning on the 100 lamps, the insulation property can be understood for each AC motor.
[0058]
The AC motor is a three-phase AC motor, and the three-phase power lines R, S, T and the motor power lines U1, V1, W1 are connected via a breaker (NFB), main switch (MS), etc. The ground terminal E is connected to the motor ground terminal (or motor case).
[0059]
In the third embodiment, a dedicated electrostatic induction voltage generator 201 is used to measure the induced electromotive force.
[0060]
FIG. 5 is a schematic diagram of the electrostatic induction voltage generator 201.
[0061]
The electrostatic induction voltage generator 201 has a very simple configuration, and a two-core shielded electric wire 211 is housed in a grounded conductive case 210. As shown in FIG. The shield conductor 212 of the electric wire 211 is connected to the lead wire to which the relays SA1, SA2, etc. are connected and the input terminal A of the buffer circuit 1 of the insulation test apparatus 10. In FIG. 6, the shield conductor 212 is indicated by a dotted line, which indicates that the core wire 213 in the range of the dotted line is covered.
[0062]
A plug 215 for connecting to a commercial 100V power source is attached to one of the core wires 213 of the two-core shielded electric wire 211, and a magnet switch 214 is connected to the other as a load for allowing an alternating current to flow through the core wire 213. are doing. The load may be anything, for example an incandescent lamp.
[0063]
The operation in the third embodiment will be described.
[0064]
In the third embodiment, an electrostatic induction voltage generator 201 is used. As described above, the electrostatic induction voltage generator 201 is a two-core shielded electric wire 211 housed in a grounded conductive case 210. Therefore, when an alternating current is passed through the core wire 213, an induced electromotive force is efficiently generated in the shield conductor 212 covering the core wire 213 by the electrostatic induction action.
[0065]
In the third embodiment, the plug 215 is inserted into a normal commercial power outlet (not shown), and the magnet switch 214 connected to the core wire 213 is turned on so that an alternating current flows through the core wire 213. .
[0066]
The electromotive force generated in the shield conductor 212 when an alternating current flows is, for example, when a shielded electric wire having a length L of 3 m is used, and when the shield conductor is not connected to the ground as a result of the experiment, a voltage of about 23 V is obtained. Occurred. This differs depending on the length and characteristics of the shielded electric wire used.
[0067]
On the other hand, the insulation inspection apparatus 10 itself is the same as that of the first embodiment described above. For this reason, since the insulation test apparatus 10 itself can detect a considerably low voltage, the induced electromotive force generated in the shielded electric wire 211 is too high as a voltage input to the insulation test apparatus 10. Therefore, in the third embodiment, the resistor 216 is attached to the shield conductor 212 and grounded so that the voltage value input to the insulation test apparatus 10 is about 10V. Note that by changing the resistance value of the resistor 216, it is possible to adjust the voltage input to the insulation test apparatus 10. Conversely, if there is no restriction on the voltage input to the insulation test apparatus 10, it is not necessary to insert such a resistor.
[0068]
Further, in the electrostatic induction voltage generator 201, the shielded electric wire 211 is housed in a grounded conductive case 210, so that the influence of electromagnetic waves from the outside can be suppressed and a stable induced electromotive force can be obtained. it can.
[0069]
FIG. 7 is a drawing showing the results of examining the insulation performance of an actual AC motor according to the third embodiment, and FIG. 7A is a graph showing the insulation value of the AC motor and the voltage value of the induced electromotive force. FIG. 7B shows these actually measured values.
[0070]
In the experiment, a resistor of various resistance values is inserted between the motor case (ground terminal) of the actual AC motor and the power line U, and the motor case and the power line U are short-circuited. Test motors of various insulation states are created in a pseudo manner, and the test is performed by connecting the insulation test apparatus according to the third embodiment, and the voltage of the induced electromotive force is measured at that time. It is a thing. In the figure, when the insulation value is infinite (∞), this is a state in which no resistor is inserted between the motor case and the power line.
[0071]
As can be seen from FIG. 7, it can be seen that there is a correlation between the insulation value and the measured voltage. Therefore, the insulation state of the AC motor can be reliably inspected according to the third embodiment.
[0072]
In the case of the AC motor used in the experiment, if the insulation value of 1 MΩ or more is generally in a good insulation state, it is “good” if the measured voltage value due to the induced electromotive force is 7 or 7 V or more, and the insulation value is 0.1 MΩ. As described above, when the voltage value is less than 1 MΩ and the voltage value is 4.2 to 7.6 V, “Caution”, and when the insulation value is less than 0.1 MΩ and the voltage value is less than 4.2 V, each voltage is regarded as “Bad”. When the signal is detected, a signal is output from the relays CR1, 2, and 3, and each lamp of the display panel 100 is turned on and off by the sequencer 90, thereby displaying the motor insulation performance step by step. Can do.
[0073]
(Fourth embodiment)
In the fourth embodiment, the insulation properties of a plurality of AC servo motors can be inspected.
[0074]
FIG. 8 is a diagram showing a facility configuration for inspecting insulation of a plurality of AC servo motors.
[0075]
Here, it is the same as the third embodiment described above except that the inspection object is a plurality of AC servo motors.
[0076]
For this reason, the insulation testing apparatus 10 is connected to the power lines U between the plurality of AC servomotors 351 and 352 and the servo amplifiers 81 and 82 controlling the AC servomotors 351 and 352 via the relays SA1 and SA2, respectively. The electrostatic induction voltage generator 201 is connected. Further, the power line connecting the relays SA1 and SA2 is not limited to the illustrated power line U, and may be any one of the three-phase power lines U, V, and W.
[0077]
The power line system of the AC servo motors 351 and 352 is a normal one, and the power lines U, V, and W are connected from the servo amplifiers 361 and 362 to the AC servo motors 351 and 352 as shown in the figure. The servo amplifiers 361 and 362 are connected to the three-phase power supply lines R, S, and T via the line filter 370, and the ground line E is connected to the ground terminals G of the AC servomotors 351 and 352 and the servo amplifiers 361, A ground terminal G of 362 is connected.
[0078]
The operation in the fourth embodiment will be described.
[0079]
FIG. 9 is a diagram showing the results of examining the insulation performance of an actual AC servo motor according to this embodiment, and FIG. 9A is a graph showing the insulation value of the AC servo motor and the voltage value of the induced electromotive force. Yes, FIG. 9B shows these measured values.
[0080]
In the experiment, a resistor having various resistance values is inserted between the ground terminal G and the power line U of the actual AC servo motor, and the ground terminal G and the power line U are short-circuited. Test motors of various insulation states are created in a pseudo manner, and the test is performed by connecting the insulation test apparatus according to the fourth embodiment, and the voltage of the induced electromotive force is measured at that time. It is a thing. In the figure, when the insulation value is infinite (∞), this is a state in which no resistor is inserted between the ground terminal G and the power line.
[0081]
As can be seen from FIG. 9, it can be seen that there is a correlation between the insulation value and the measured voltage. Therefore, the insulation state of the AC servo motor can be reliably inspected according to the fourth embodiment.
[0082]
In the case of the AC servo motor used in the experiment, if the insulation state is generally good at 1 MΩ or more, the voltage value due to the induced electromotive force to be measured is “good” if the voltage value is 9.5 V or more, and the insulation value is 0.1 MΩ or more. When the voltage value is less than 1 MΩ and the voltage value is 5.0 to 9.4 V, “Caution”, and when the insulation value is less than 0.1 MΩ, the voltage value is less than 5.0 V. When detected, signals are output from the relays CR 1, 2, and 3, and each lamp of the display panel 100 is turned on and off by the sequencer 90 to display the motor insulation performance step by step. Can do.
[0083]
Although the embodiment of the present invention has been described above, the present invention is not limited to such an embodiment. For example, in the first embodiment described above, in order to electrostatically induce the power line of the DC motor, electricity is supplied to the power line of the motor control device that is concentrated along the power line. Such a configuration is not limited to a DC motor, and can be applied to an AC motor. Further, the charging member may be any member as long as it is completely insulated from the motor power line and wired along the motor power line. The electrical wiring of other devices without the above may be used. Further, when there is no other wiring along the motor power line, a dedicated electric wiring (for example, a power line of commercial power supply AC100V) may be arranged along the motor power line separately for the insulation test. As a result, the insulation of the motor can be inspected in the same manner as in the above-described embodiments.
[0084]
Conversely, the DC motor can also be inspected using an electrostatic induction voltage generator as in the third embodiment and the fourth embodiment described above. Further, the shielded electric wire used for the electrostatic induction voltage generator may be a one-core shielded electric wire in addition to the two-core shielded electric wire.
[0085]
Further, in each of the above-described embodiments, the insulation performance is displayed by the LED, the lamp of the display panel, etc. in a range of three levels according to the measured voltage value. In addition, there are various levels such as two levels depending on whether or not the insulation performance is definitely at a safe level, multiple levels such as four levels and five levels, or a numerical value as a specific insulation value. It is also possible to adopt a different display form.
[Brief description of the drawings]
FIG. 1 is a circuit diagram showing a configuration of an insulation inspection apparatus according to a first embodiment to which the present invention is applied.
FIG. 2 is a drawing for explaining an example of an inspection result using the insulation inspection apparatus.
FIG. 3 is a circuit diagram showing a configuration of equipment using an insulation inspection apparatus according to a second embodiment to which the present invention is applied.
FIG. 4 is a circuit diagram showing a configuration of equipment using an insulation inspection apparatus according to a third embodiment to which the present invention is applied.
FIG. 5 is a schematic diagram for explaining an electrostatic induction voltage generator used in the insulation test apparatus according to the third embodiment.
FIG. 6 is a circuit diagram for explaining a two-core shielded electric wire used in the electrostatic induction voltage generator.
FIG. 7 is a graph showing insulation values and measurement voltages for explaining the operation of the insulation test apparatus according to the third embodiment, and a table showing measured value data.
FIG. 8 is a circuit diagram showing a configuration of equipment using an insulation inspection apparatus according to a fourth embodiment to which the present invention is applied.
FIG. 9 is a graph showing insulation values and measurement voltages for explaining the operation of the insulation test apparatus according to the fourth embodiment, and a table showing measured value data.
[Explanation of symbols]
1 ... Buffer circuit,
2 ... Operation amplification circuit,
3 ... Rectifier circuit,
4 ... amplifier circuit,
5: Determination circuit,
10. Insulation inspection device
51-60 ... DC motor,
71-80 ... Power lines,
90 ... Sequencer,
100 ... display panel,
110 ... Concentrator,
201 ... an electrostatic induction voltage generator,
210 ... Case,
211 ... 2-core shielded wire,
212 ... Shield conductor,
213 ... core wire,
214 ... Magnet switch,
215 ... plug,
216. Resistor,
251,252 ... motor,
351, 352 ... Servo motor,
361, 362 ... Servo amplifier,
370: Line filter.

Claims (9)

A device for inspecting the insulation of a motor,
A charged body insulated from the electric wiring for the motor for supplying electric power to the motor, and disposed in the vicinity of the electric wiring for the motor
Voltage measuring means for measuring the voltage of the electromotive force induced in the electric wiring for the motor by the charged body;
An insulation test apparatus characterized by comprising: A device for inspecting the insulation of a motor,
A conductor electrically connected to the electric wiring for the motor for supplying electric power to the motor;
A charged body that is insulated from the electric wiring for the motor and the conductor and disposed in the vicinity of the conductor;
Voltage measuring means for measuring the voltage of the electromotive force induced in the conductor by the charged body;
An insulation test apparatus characterized by comprising:   The insulation test apparatus according to claim 1, wherein the charged body is an AC electrical wiring through which an alternating current flows.   The insulation test apparatus according to claim 3, wherein the AC electrical wiring is a power line that is wired along the electrical wiring for the motor and supplies power to a control device of the motor. The charged body is an AC electrical wiring through which an alternating current flows,
The insulation test apparatus according to claim 2 , wherein the conductor is a shield conductor that covers the AC electrical wiring.   6. The insulation inspection apparatus according to claim 5, wherein the AC electrical wiring and the shield conductor covering the AC electrical wiring are housed in a grounded conductive case.   2. The insulation test apparatus according to claim 1, wherein the voltage measuring means is connected to electric wirings for motors of a plurality of motors for each relay through a plurality of relays.   The insulation test apparatus according to claim 2, wherein the conductor is connected to electric wiring for a motor of a plurality of motors for each relay through a plurality of relays. The said insulation test | inspection apparatus further has a display means to display the said measurement result in steps according to the measurement result of the said voltage measurement means, The one of Claim 1 characterized by the above-mentioned. Insulation inspection device.

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