JP2649210B2 - Non-rotating test method and apparatus for electric motor, and mechanical system using electric motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-rotational test method for ascertaining the characteristics of a three-phase AC motor used for machinery and equipment in various fields such as production, processing, distribution, packaging, and the like. The present invention relates to a device and a mechanical system using a three-phase AC motor.

[0002]

2. Description of the Related Art In recent years, so-called factory automation has been actively pursued in order to increase productivity, aiming at automation, unmanned operation, and high efficiency of production systems, and various automation devices in all industrial fields. Equipment is being developed. Servo motors are generally used as drive devices in these machines and equipment.In particular, AC motors are simple in structure, low in price, easy to handle and maintain, and have good environmental resistance adaptability. It is widely used for commercial purposes, from those having a relatively small capacity to those having a large output of 100 kW or more.

In order to control an AC motor with high precision,
It is necessary to grasp its electrical characteristics, such as slip, torque, power factor, efficiency, etc., with higher accuracy. Conventionally, in the case of induction motors, which are often used as high-output AC motors, a type of non-rotation test called a restraint test is performed, and voltage, current, power, etc. are measured while the rotor is restrained, and those signals are measured. For example, a method of grasping characteristics such as resistance and leakage inductance by performing processing based on an equivalent circuit, a circle diagram calculation method, or the like is generally adopted.

FIG. 9 shows an example of a configuration of a conventional restraint test apparatus. In the restraint test, three-phase power supply terminals u, v,
w, a three-phase power sensor 2 is connected to an AC motor 1 having
Further, a three-phase AC power supply 4 is connected via the voltage regulator 3.
A current sensor 5 and a voltage sensor 6 are provided between the three-phase power sensor 2 and the voltage regulator 3. Motor 1
Is mounted with a restraint device 7 for preventing rotation and maintaining the non-rotation state when power is supplied from a three-phase AC power supply. Then, the rotor of the electric motor 1 is restrained by the restraining device 7 to adjust the applied voltage, and the restraint voltage and the loss when a current equal to the rated current flows are measured.

[0005] Instead of this constraint test method, a 2-3 phase conversion based on a 2 phase model and a PWM for a 3 phase AC motor are used.
Non-rotational testing methods have been proposed that attempt to maintain the motor in a substantially non-rotating state using the concept of modulation. FIG. 10 schematically shows the configuration of a test apparatus according to this method. The three-phase AC motor 1 has a three-phase inverter element 8
And a 2-3 phase converter 10 for converting a two-phase signal into a three-phase signal via a PWM modulator 9. 3
The phase inverter element 8 includes a DC power supply 11 for the inverter.
However, a carrier signal generator 12 for PWM modulation is connected to the PWM modulator 9. 2-3 phase converter 1
0 is connected to a two-phase voltage signal generator 13 and a trigonometric function generator 15 connected to an angle indicator 14 for forcibly indicating an angle θ ^* of a secondary magnetic flux or the like. . From the voltage, current, etc. measured in this type of non-rotating test
To determine characteristics such as motor resistance and leakage inductance
The calculation formulas are, for example, Hidehiko Sugimoto, Masaru Imanaka and Yano
Masao's paper, "Invitation Based on Model Reference Adaptive System"
Initial Identification of Conduction Motive Constants ”(June 24, 1988,
Japan Society of Electrical and Industrial Engineers, Industrial Electric Power Application Research Society; IEA-88-1
8; 111-120) and Shinji Shinnaka, the inventor of the present application.
Author's "Adaptive Algorithm" (Sangyo Tosho 199
0) and is already known to those skilled in the art. Also,
A similar calculation formula is based on a paper by Yoichi Omori and Ichiro Miyashita
`` Automatic measurement of motor constants for speed sensorless vector control
("The 19th Annual Conference of the Institute of Electrical Engineers of Japan, p. 6-48")
In this paper, one of the three phases of the motor is opened.
Voltage, current, etc. to determine the characteristics of the motor.
A rotation test method is employed.

The operation of the test device will be described. First,
The two-phase voltage signal generator 13 generates a two-phase signal,
Input to the three-phase converter 10. At the same time, a constant angle (θ ^* = const) is output from the angle indicator 14 to the trigonometric function generator 1.
5, two trigonometric function signals, sin (θ ^* ) and cos (θ ^* ), are output to the 2-3 phase converter 10. The 2-3 phase converter 10 converts the two-phase voltage signal into a three-phase signal using the input trigonometric function signal, and outputs the signal to the PWM modulator 9. The PWM modulator 9 receives a carrier signal of several kilohertz to several tens of kilohertz from the carrier signal generator 12 and performs PWM modulation of each of the three-phase signals for each phase by using the carrier signal. Output to element 8. The inverter element 8 is switched according to the PWM-modulated three-phase signal. The switching frequency at this time is about twice the frequency of the PWM carrier signal. Through such high-speed switching, the inverter element 8 converts the DC voltage applied from the DC power supply 11 into a three-phase voltage including a high-frequency component and outputs the three-phase voltage. In this method, a three-phase AC voltage is substantially generated by a combination of an inverter element and a DC power supply. In this respect, these combinations correspond to the three-phase AC power supply in the conventional constraint test described above. You can also say that you are. Of FIG.
The test equipment measures voltage, current, etc. in this way, and
Substitute constant values into calculation formulas described in the above-mentioned known documents
To understand the characteristics of the electric motor.

[0007]

A test for grasping the characteristics of a motor is performed not only at the time of manufacture of the motor but also after being incorporated in a mechanical system using the motor, to know the influence of the use situation, aging, and the like. It is important and necessary to implement. However, in the conventional constraint test described above,
It was practically impossible to carry out the motor with the motor incorporated in the mechanical system, and it was necessary to remove the motor once from the mechanical system and assemble it into the restraint test apparatus. For this reason, there has been a problem that a great deal of labor and time are required for attaching and detaching the electric motor, and there is a possibility that mechanical damage may be caused to a shaft of the electric motor during the attaching and detaching operation. Further, in this test method, a restraining device that exerts a restraining force according to the output of the motor is required, but its application to a high-power motor has been limited. In addition, heat is generated to forcibly stop the rotation of the motor mechanically, which may result in a change in the performance of the test apparatus and the motor.
It was difficult to carry out the test continuously for a long time.

On the other hand, the above-mentioned conventional non-rotation test method attempts to maintain the motor in a non-rotation state by forcibly indicating a fixed angle as a magnetic flux angle from the angle indicator 14. No restraint device is required. However, it requires a two-phase model usually used for vector control and the like, and a system based on this. For this reason, a trigonometric function generator not required in the constraint test, 2-3
A phase converter, a carrier signal generator, a PWM modulator and the like are newly required. As a result, there is a problem that the configuration of the test method and the test apparatus becomes complicated and complicated, and the cost increases. In addition, since the applied voltage includes unnecessary high-frequency components due to high-speed switching of the inverter element, there is a problem that the electric motor and the like are adversely affected.

The conventional constraint test has the advantage that the applied voltage does not need to have any special properties and the configuration of the test apparatus is simple, but on the other hand, the motor generates torque with respect to the applied voltage and, consequently, causes the rotor to rotate. It has the disadvantage of requiring a restraint device to restrain. On the other hand, conventional non-rotational testing methods that do not require a restraint have the disadvantage that the overall configuration is significantly more complex in relation to the generation of the applied voltage.
Therefore, a new test method that overcomes these problems has been strongly desired.

[0010] The present invention has been made in view of the above-mentioned problems occurring in the prior art, claim 1 and claim
The non-rotating test method of the electric motor according to the item 7 does not require any restraint device for preventing the electric motor from rotating, and can be easily tested without removing the electric motor incorporated in the mechanical system. It is an object of the present invention to provide a new test method which can make the configuration for generating a voltage to be at least as simple as a conventional restraint test, and which can be used at a low cost and which can grasp the characteristics of the motor with high accuracy. .

According to a second aspect of the present invention, there is provided a non-rotating test apparatus for a motor, which implements the test method according to the first aspect.
A new testing device that has a relatively simple structure, is easy to handle, can test the motor incorporated in the mechanical system as it is, is low-cost, and can grasp the characteristics of the motor with high accuracy. It is intended to provide.

In addition to the above, the test apparatus according to claim 3 is
It is an object of the present invention to provide a test apparatus capable of improving operability, making handling easier, and improving test efficiency and accuracy.

According to a fourth aspect of the present invention, there is provided a test apparatus in which a range of a voltage signal applied to a motor at the time of a test is appropriately adjusted to improve measurement accuracy and improve practicality. The purpose is to:

In addition to the above, the test apparatus according to claim 5 is
An object of the present invention is to simplify the configuration and facilitate handling, thereby achieving higher measurement accuracy and lower cost.

Further, in the mechanical system according to the present invention, the electric motor can be tested on site at any time as needed, so that labor and time for the test can be saved, and the operating efficiency of the machine and equipment can be increased. The aim is to provide a mechanical system that can.

[0016]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, and its contents will be described below with reference to embodiments shown in the drawings.

In order to determine the characteristics of a three-phase AC motor, one of the three phases of the motor is short-circuited and a single-phase voltage is applied to the remaining one phase. It is characterized in that the current is applied and at least the current is measured in that state. In addition to this, the non-rotating circuit according to claim 7
Method, the frequency of the single-phase voltage is about 0 to several tens Hz.
It is characterized by a low frequency.

According to a second aspect of the present invention, there is provided a non-rotating test apparatus for a motor, comprising: a short-circuit means for short-circuiting any two of the three phases of the motor to obtain characteristics of the three-phase AC motor; And a voltage applying means for applying a single-phase voltage to the power supply, and a measuring means for measuring at least a current.

According to a third aspect of the present invention, there is provided a non-rotating test apparatus for a motor, wherein the short-circuiting means freely selects two phases to be short-circuited from three phases of the motor in accordance with an external instruction. It is characterized by having possible control means.

According to a fourth aspect of the present invention, there is provided a non-rotating test apparatus for a motor, wherein the voltage applying means includes a signal generating means for generating a signal for an applied voltage, and a signal generating means. Voltage adjusting means for adjusting and applying the amplitude of the generated signal.

According to a fifth aspect of the present invention, there is provided a non-rotating test apparatus for a motor, wherein the short-circuit means and the voltage adjusting means are constituted by one three-phase inverter element. I do.

Further, a mechanical system according to claim 6 comprises a three-phase AC motor for driving a load, and a driver for driving and controlling the motor, and short-circuit means for short-circuiting any two of the three phases of the motor; The present invention is characterized in that a test apparatus comprising voltage applying means for applying a single-phase voltage to the remaining one phase and at least current measuring means is provided integrally.

[0023]

Therefore, according to the non-rotating test method for a motor according to the first aspect, by short-circuiting any two of the three phases of the three-phase AC motor, any one of the three terminal voltages of the motor is reduced. Since the motor is maintained at zero voltage, it can be tested in a state where the motor does not generate torque. In addition, since the voltage between the terminals that are not zero voltage is substantially one, the applied voltage becomes single-phase. And application and measurement of electrical signals such as current associated therewith. Also, in the normal energized state of the AC motor, three phases
Since the current flows through all of the motors,
Prior art methods of opening one of the phases require a bold
The approximation is used, so the calculated value is large and easy to go wrong
On the other hand, according to the present invention, any two of the three phases
Test under conditions closer to actual use because of short circuit
be able to. Further, according to the non-rotating test method according to claim 7,
If so, the conventional non-rotational test method described with reference to FIG.
Due to high-speed switching of inverter elements such as
High frequency components of several kilohertz to several tens kilohertz are included in the applied voltage.
Can prevent adverse effects on motors, etc.
Wear.

Further, according to the non-rotating test apparatus for a motor according to the second aspect, since any two of the three phases of the three-phase AC motor are short-circuited by the short-circuiting means, any one of the three terminal voltages of the motor is used. One can be maintained at zero voltage to maintain the motor in a torque-free state, and since there is essentially one terminal between the non-zero voltages, this results in an electrical signal such as an associated current. Can be easily measured.

According to the third aspect of the present invention, the test can be performed in a well-balanced and reliable manner by appropriately giving an instruction from outside the test apparatus via the control means.

According to the fourth aspect of the present invention, the voltage adjusting means amplifies the applied voltage signal when the applied voltage signal is weak and attenuates the applied voltage signal when the applied voltage signal is large. Can be properly maintained.

According to the non-rotating test apparatus for a motor of the present invention, by turning on and off one inverter element, any two of the three phases of the motor are short-circuited and the applied voltage is set to an appropriate voltage level. Can be adjusted.

Further, according to the mechanical system of the sixth aspect, a test can be carried out as needed at the site without removing the electric motor from the mechanical system.

[0029]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows the configuration of a first embodiment of a non-rotating test apparatus for a motor according to the present invention. 3-phase induction motor, 3
A three-phase AC motor 21 such as a phase synchronous machine includes three-phase power supply lines 22 and 2 connected to three power supply terminals u, v and w, respectively.
It is connected to a short-circuit device 25 via 3 and 24. The short-circuit device 25 is connected to the electric motor 21 via the single-phase power supply lines 26 and 27.
Connected to a single-phase power supply 28 for generating a voltage applied to the power supply. With the short-circuit device 25, the terminal u of the electric motor 21,
Either one between v and w is short-circuited. Thus, no matter what voltage is applied from the single-phase power supply 28 to the power supply lines 26 and 27, the electric motor 21 does not rotate.

A current sensor 29 for measuring a current during the non-rotation test is provided on one of the single-phase power supply lines 26, and a single-phase power supply 28 is provided between the two single-phase power supply lines 26 and 27.
A voltage sensor 30 for measuring an applied voltage from the power supply is provided. These sensors can be appropriately omitted depending on the method of generating voltage and current. For example,
When the voltage as instructed is correctly generated from the single-phase power supply 28, the voltage sensor 30 can be omitted. It should be noted that the present embodiment does not include a power sensor, because it is needless to say that the power can be calculated immediately if the current and the voltage can be measured. Of course, a power sensor may be added depending on the method of processing the electric signal.

According to the motor non-rotation test method of the present invention, in the configuration shown in FIG. 1, any two terminals of the three-phase AC motor 21 whose characteristics are to be grasped,
For example, v and w are short-circuited. Next, a test current of a single-phase voltage is supplied from the power supply 28 to the electric motor 21 via the power supply lines 26 and 27. As described above, since the terminals v and w are short-circuited and have zero potential, the single-phase voltage is applied to the remaining non-short-circuited terminals uv (w). The current and the voltage at this time are measured by the current sensor 29 and the voltage sensor 30.
Then, using these measured values, the characteristics of the electric motor 21 are obtained by a calculation formula based on a well-known circle diagram method or the like. As such a calculation formula, each of the well-known
It is possible to use those described in the literature
The same method as the non-rotational test method described therein.
It is necessary to determine characteristics such as resistance of the motive and leakage inductance.
Can be.

FIG. 2 shows the configuration of a second embodiment of the test apparatus according to the present invention. The second embodiment has substantially the same configuration as the test apparatus of the above-described first embodiment, but a system controller 31 that comprehensively controls the test, such as starting and stopping a non-rotational test and collecting data during execution. Is further provided. That is, the system controller 31 controls the short-circuit device 2
5, single-phase power supply 28, current sensor 29 and voltage sensor 30
Control the phase to be short-circuited to the short-circuit device 25, control the magnitude and waveform of the applied voltage to the single-phase power supply 28, and take in the signals to the sensors 29 and 30. It has the function of controlling the processing and comprehensively controlling the start and end of the test itself.

FIG. 3 shows an embodiment of a short circuiter used in the second embodiment. The short-circuit device 25 includes a three-phase power supply terminal 32 on the motor side and a single-phase power supply terminal 33 on the power supply side.
And a three-phase switch 34 connected between them. The three-phase switch 34 is controlled by a switch control unit 35,
A selection is made between terminals of the motor 21 to be short-circuited. The switch controller 35 is connected to the system controller 3 via a signal line 36.
1 connected. Then, according to the instruction of the system controller 31, the three terminals r, s, t on the single-phase side and the three terminals u ', v', w 'corresponding to the terminals u, v, w of the electric motor 21 are combined, and a voltage is applied. On / off control.
Here, the terminals s and t on the single-phase side are short-circuited in advance.
For example, in the three-phase switch 34, the terminal is ru '.
Is connected, the vw phase of the electric motor 21 becomes r−
v ′, the wu phase of the motor 21 becomes r
−w ′, the uv phase of the motor 21 is
Each will be short-circuited. In this case, r on the power supply side
ON / OFF of voltage application to the electric motor 21 can be controlled by connecting / disconnecting the terminals.

This short-circuit device can be applied to the test apparatus of the first embodiment. In this case, the switch control unit 35
Is operated directly via a separate changeover switch or the like or manually, not by an instruction from the system controller 31.

FIG. 4 shows another embodiment of the short circuit device 25. In this short-circuit device, the combination of the motor-side power supply lines 22 to 24 and the power supply-side power supply lines 26 and 27 and the switching of voltage application on / off are manually performed. That is, without the switch control unit 35 of FIG. 3, the motor-side power supply lines 22 to 24 and the power-supply side power supply lines 26 and 27 are short-circuited at a specific one between the three-phase terminals of the motor 21. A voltage is applied to the electric motor 21 by directly connecting between the terminal 32 and the terminal 33 and turning on and off the single-phase power supply 28. Therefore, a short-circuit device can be realized at very low cost.

FIG. 5 shows the configuration of one embodiment of the single-phase power supply 28. The power supply includes a signal generator 37 for generating a signal for an applied voltage, and a voltage adjuster 38 for adjusting the amplitude of the signal and applying the signal to the electric motor. If the voltage of the signal generated from the signal generator 37 is weak, the voltage adjuster 3
8 has a function of amplifying the signal. Signal generator 37
Can be easily manufactured by a combination of a digital operation element such as a microprocessor and an AD converter. Further, by mounting a DA board on a personal computer, it can be realized more easily and simply. When such digital means is employed, a signal of an arbitrary shape can be generated very easily.

The signal may be formed as a DC, a sine wave, a composite wave obtained by connecting sine waves of different frequencies in a time series, a composite wave obtained by superimposing sine waves of a plurality of frequencies at the same time, a rectangular wave, a triangular wave. , Or a composite wave of these. These signals are typically much lower, on the order of one thousandth, compared to prior art tests.
This is a low-frequency signal composed of a frequency component of about ten and several Hz.

The signal generator can be realized by analog means such as an analog element or device instead of the digital means. In this case, although the degree of freedom of the generated waveform is reduced, it is advantageous in that the DA converter can be omitted.

As described above, for a weak signal,
Although the voltage adjusting section 38 functions as a signal amplifier, the characteristics of the amplifier in this case need not necessarily be linear. Thus, the present invention provides a considerable choice of available amplifiers, which can be
It has the advantage that it can be easily made with a power element such as a power operational amplifier. Therefore, according to the present invention, it is possible to simplify the configuration while maintaining the performance of the motor test apparatus. FIG. 6 shows the configuration of an embodiment of an amplifier using such a power operational amplifier. In the figure, reference numeral 39 denotes a high capacity operational amplifier, 4
0 is a single-phase power supply terminal for inputting a weak signal, and 41 is a voltage balance adjusting means.

When the signal generated by the signal generator 37 shown in FIG. 5 has a sufficient voltage, the voltage regulator 38 functions as an attenuator for lowering the voltage. In order to reduce such a voltage, a normal single-phase transformer can be used. By amplifying or reducing the voltage in this way, the voltage level applied to the motor during the test can be appropriately adjusted, and the measurement accuracy can be improved.

FIG. 7 shows an embodiment of the voltage applying device 42 in which the short-circuit function and the voltage adjusting function described above are integrated using one three-phase inverter element to simplify the configuration of the test apparatus. Is shown. The voltage application device 42 is a motor 3
It comprises a short-circuiting part 43 that functions to short-circuit the phase terminals, and an amplifying part 44 that performs voltage adjustment and performs an amplifying function. The amplification section 44 has a DC power supply 45. The short-circuit part 43 is 3
The amplifier unit 44 is connected to the terminals u, v, and w of the electric motor 21 via the phase power supply terminal 46, and receives a single-phase voltage signal via the single-phase power supply terminal 47. As shown, the inverter element forming the voltage application device 42 has six switching sub-elements 48. As is well known, the switching sub-element 48 includes two elements connected in series each connected in parallel to the DC power supply 45, and each of the two elements 48 connected in series. The three-phase power supply terminals 46 are connected between them. Further, in the present embodiment, signals of the same sign are applied from the single-phase power supply terminal 47 to the v-phase and w-phase switching sub-elements 48.

Next, the operation of the voltage applying device 42 according to the present embodiment will be described. The turning on / off of the switching sub-elements in this embodiment is performed according to a rectangular signal input to the single-phase power supply terminal 47. That is, the single-phase rectangular signal input as “ON” or “OFF” to the single-phase power supply terminal 47 in FIG. 7 is used as the ON / OFF signal of each switching sub-element 48 in the inverter element. Become. Upon receiving the rectangular signal, the amplifier 44 amplifies the rectangular signal to the voltage level of the DC power supply 45. The amplified voltage is output to the three-phase power supply terminal 46 through the short circuit 43. At this time, the short-circuit portion 43 short-circuits the v-w phase of the three phases by applying the signal of the same sign to the v-phase and w-phase switching sub-elements 48 as described above. In another embodiment, it is apparent that the wu phase or the uv phase can be similarly short-circuited by changing the combination of the on / off signals applied to the six switching sub-elements. As described above, in the present embodiment, the shape of the single-phase voltage signal is limited to a rectangular shape.
This is extremely advantageous in that the short circuit function and the voltage adjustment function can be simultaneously realized by the number of inverter elements, because the configuration is simplified, the cost can be reduced, and high accuracy can be achieved.

In the conventional non-rotational test apparatus described with reference to FIG. 10, the three-phase inverter element is combined with a PWM modulator and a carrier signal generator to provide a three-phase PWM.
It is used as a means of amplifying M signal,
As an input thereto, a high-frequency three-phase PWM signal of several kilohertz to several tens kilohertz is applied. On the other hand, in the embodiment shown in FIG. 7 of the present invention, a three-phase inverter element is used as one of the elements for power electronics. The purpose of the present invention is to achieve the two purposes of the previous single-phase signal voltage adjustment function. Therefore, since neither a PWM modulator nor a carrier signal generator is required, the configuration is simpler and the cost can be reduced. Further, since the input signal is a single-phase signal having a low frequency of 0 to several tens Hz, the motor to be tested is not adversely affected.

FIG. 8 schematically shows the configuration of a typical mechanical system according to the present invention, in which a non-rotating test apparatus for a motor according to the present invention is integrally incorporated. This mechanical system includes a three-phase AC motor 50 that drives a load 49, a driver device 51 that drives the motor, and a three-phase AC power source 52 that is a driving power source for the motor 50. The driver device 51 integrally incorporates a motor drive unit 53 during normal operation and a motor test unit 54 that performs a non-rotation test according to the present invention. The motor driving unit 53 includes a driver circuit 55 for controlling the driving of the motor 50, a sensor 56 for detecting an operating state of the motor 50, and a system controller during normal operation for controlling the driver circuit 55 based on a signal from the sensor. 57.

The motor test section 54 has a configuration similar to that of the test apparatus of the second embodiment shown in FIG. 2, and includes a short-circuit device 58 selectively connectable to the motor 50, and a single-phase circuit connected to the motor 50 through the short-circuit device. It includes a single-phase power supply 59 for applying a voltage, and a test system controller 60 for controlling the short-circuit device 58 and the single-phase power supply 59. During normal operation, the motor 50 and the short-circuit device 58
Has been disconnected between. When testing the electric motor 50, the three-phase power supply terminal is connected to the short-circuit device 58, and one of the power supply terminals is short-circuited according to an instruction from the test system controller 60. From 59, a predetermined level of single-phase voltage is applied. Then, at least the current and, if necessary, the voltage and the like are measured using a sensor 56 which is usually used for operating the electric motor. The characteristics of the electric motor 50 are determined based on the measured values.

By incorporating the test apparatus in this way, the characteristics of the electric motor 50 can be tested as needed without removing the electric motor from the mechanical system or suspending the operation for a long time. In another embodiment, a system control unit for controlling the entire mechanical system is provided so that the control of the driver circuit 55 and the control of the test unit 54 during normal operation can be performed. Such a mechanical system can be applied to various machines and equipment such as an automated machine such as an NC machine tool and a conveyor device.

Although the preferred embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment.
Various modifications and changes can be made within the technical scope.

[0049]

Since the present invention is configured as described above, it has the following effects.

According to the non-rotating test method for a motor according to the first aspect, the motor is tested in a state where no torque is generated by holding any one of the three terminal voltages of the motor at zero voltage. This eliminates the need for conventional restraining devices, and eliminates the need to remove the electric motor even if it is built into the mechanical system, saving considerable labor and time, making the motor relatively simple and low-cost. Can be obtained. In addition, since the voltage applied to the motor during the test is single-phase, generation and application of a required voltage and measurement of an electric signal such as a current related thereto can be facilitated . In addition, the present invention
According to the short-circuit of any two of the three phases of the motor
Therefore, the test is performed under more realistic motor operating conditions.
In terms of accuracy,
It is. Further, according to the non-rotational test method according to claim 7, the single phase
To set the frequency of the voltage to a low frequency of about 0 to several + Hz
Therefore, the test can be performed with high accuracy without adversely affecting the electric motor.

Further, according to the non-rotating test apparatus for a motor according to the second aspect, since a conventional restraining device is not required, the test can be performed with a relatively simple configuration, and the mechanical system can be implemented. Since it is not necessary to remove the built-in electric motor, labor and time can be greatly reduced, and the cost can be reduced. Furthermore, since the applied voltage becomes single-phase, it becomes easy to generate and apply a required voltage and to measure an electric signal such as a current related thereto, so that the characteristics of the electric motor can be easily and more accurately grasped. be able to.

In addition to the above, according to the non-rotating test apparatus for a motor according to the third aspect, a test can be performed by externally instructing the apparatus, so that the handling and operability of the apparatus are improved.
Efficiency can be achieved by making the test easier and more reliable.

According to the motor non-rotating test apparatus according to the fourth aspect, by amplifying and attenuating the voltage application signal, it is possible to appropriately adjust even the voltage of the applied signal is weak. Since the characteristics of the electric motor can always be grasped with higher accuracy according to the test conditions, the practicality is improved.

In addition, according to the non-rotating test apparatus for a motor according to the fifth aspect, the short circuit function and the adjustment function of the applied voltage can be achieved by one inverter element, so that the configuration is further simplified. Cost can be reduced, and accuracy can be further improved.

According to the mechanical system of the sixth aspect, a test can be carried out as needed at any time while the electric motor is assembled, so that labor and time can be greatly saved, and the machine can be saved. The operating efficiency of the system can be improved, and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram schematically showing a configuration of a first embodiment of a non-rotating test apparatus for a motor according to the present invention.

FIG. 2 is a block diagram schematically showing a configuration of a second embodiment of the non-rotating test apparatus for a motor according to the present invention.

FIG. 3 is a block diagram showing a first embodiment of a short circuiter used in a non-rotating test apparatus for a motor according to the present invention.

FIG. 4 is a block diagram showing a second embodiment of a short circuiter used in a non-rotating test apparatus for a motor according to the present invention.

FIG. 5 is a block diagram showing a configuration of a single-phase power supply used in the present invention.

FIG. 6 is a circuit diagram illustrating a configuration example of a voltage adjustment unit of a single-phase power supply.

FIG. 7 is a circuit diagram illustrating a configuration example of a voltage application device including one inverter element according to the present invention.

FIG. 8 is a block diagram showing a configuration of a typical example of a mechanical system according to the present invention.

FIG. 9 is a block diagram showing a configuration of a test device using a conventional restraint device.

FIG. 10 is a block diagram schematically showing a configuration of a conventional non-rotational test apparatus.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 AC motor 2 3 phase power sensor 3 voltage regulator 4 3 phase AC power supply 5 current sensor 6 voltage sensor 7 restraint device 8 inverter element 9 PWM modulator 10 2-3 phase converter 11 DC power supply 12 carrier signal generator 13 2 Phase voltage signal generator 14 Angle indicator 15 Trigonometric function generator 21 AC motor 22 to 24 Power supply line 25 Short circuit device 26, 27 Power supply line 28 Single-phase power supply 29 Current sensor 30 Voltage sensor 31 System controller 32 Three-phase power supply terminal 33 Single-phase power supply terminal 34 Three-phase switch 35 Switch control unit 36 Control signal line 37 Signal generation unit 38 Voltage adjustment unit 39 Operational amplifier 40 Single-phase power supply terminal 41 Balance adjustment unit 42 Voltage application device 43 Short-circuit unit 44 Voltage adjustment unit 45 DC power supply 46 Three-phase power supply terminal 47 Single-phase power supply terminal 48 Switching sub-element 49 Load Reference Signs List 50 AC motor 51 Driver device 52 AC power supply 53 Motor drive unit 54 Motor test unit 55 Driver circuit 56 Sensor 57 System controller 58 Short circuit device 59 Single-phase power supply 60 System controller

Continuation of the front page (72) Inventor Norio Sakakibara 2-8-8 Arima, Miyamae-ku, Kawasaki-shi, Kanagawa Pref.

Claims (7)

(57) [Claims] 1. A test method for determining characteristics of a three-phase AC motor, wherein one of two phases of three phases of the motor is short-circuited, and
A non-rotating test method for a motor, comprising applying a single-phase voltage to a phase and measuring at least the current in that state. 2. A test apparatus for determining characteristics of a three-phase AC motor, a short-circuit means for short-circuiting any two of three phases of the motor, and applying a single-phase voltage to the remaining one phase. A non-rotational test apparatus for a motor, comprising: a voltage application unit for performing a test, and a measurement unit for measuring at least a current. 3. The electric motor according to claim 2, wherein said short-circuit means has control means capable of freely selecting two phases to be short-circuited from three phases of said electric motor in response to an instruction from outside. Rotation test equipment. 4. The voltage applying means has signal generating means for generating a signal for an applied voltage, and voltage adjusting means for adjusting and applying the amplitude of the signal for the applied voltage generated by the signal generating means. 3. The non-rotating test apparatus for an electric motor according to claim 2, wherein: 5. The non-rotating test apparatus for an electric motor according to claim 4, wherein said short-circuit means and said voltage adjusting means comprise one three-phase inverter element. 6. A mechanical system comprising: a three-phase AC motor for driving a load; and a driver for driving and controlling the motor, wherein a short-circuit means for short-circuiting any two of the three phases of the motor; Voltage applying means for applying a single-phase voltage to one phase;
A mechanical system, comprising a test apparatus integrally comprising at least a means for measuring a current. 7. The frequency of the single-phase voltage is about 0 to several tens Hz.
The electric motor according to claim 1, wherein the frequency is low.
Non-rotating test method of machine.