Permanent magnet motor short-circuit current test equipment
By using a servo motor to drive a permanent magnet motor and combining it with a computer module to detect current data in real time, the problems of impedance influence and speed decay in traditional testing methods are solved, thus achieving accuracy and authenticity in the short-circuit current test of permanent magnet motors.
Patent Information
- Application Number
- CN202422836145.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-21
- Publication Date
- 2026-01-16
- Estimated Expiration
- 2034-11-21
AI Technical Summary
Traditional methods for testing the short-circuit current of permanent magnet motors are affected by the impedance of the transformer and controller, resulting in distorted and inaccurate measurement results. Furthermore, the speed decreases during testing, making it impossible to accurately obtain the short-circuit current value at a specified speed.
The test motor is directly driven by a drive mechanism (servo motor), and short-circuit and open-circuit operations are controlled by a computer module. The current data is detected in real time by a data acquisition module, generating current waveforms and characteristic values. This avoids the impedance effects of transformers and controllers and maintains stable speed.
This method achieves accuracy and authenticity in short-circuit current testing of permanent magnet motors, avoids speed decay, and ensures the reliability and precision of test results.
Smart Images
Figure CN223808532U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to permanent magnet motor test technical field especially relates to a permanent magnet motor short circuit current test equipment. BACKGROUND
[0002] With the development of new energy vehicles, the progress of industrial automation and the attention and appeal of the country to energy saving and emission reduction, the application of permanent magnet motor is more and more extensive, and gradually becomes the development trend of motor industry.
[0003] The short circuit current of permanent magnet motor affects the maximum output power of motor to some extent, is an important parameter in motor design, on the other hand, when the short circuit current of motor is large, whether the irreversible demagnetization of permanent magnet of permanent magnet motor occurs when the short circuit of motor occurs, thereby affecting the performance of permanent magnet motor is considered, when the irreversible demagnetization of permanent magnet occurs, the permanent magnet motor will have problems such as performance reduction, output power reduction, and even heating anomaly, burning machine fire and even endanger property and life safety. Therefore, the short circuit current of permanent magnet motor needs to be tested and evaluated, and then the above situation is avoided.
[0004] According to the provisions of GB / T 755 'Rotating Machine Rating and Performance', the traditional short circuit current test is that under the rated voltage, the motor is driven by the transformer and / or controller driving mechanism to run in the no-load condition, then the three-phase winding of the motor is suddenly short-circuited, and the short-circuit current of the motor is measured at the moment of short-circuiting, this method is affected by the impedance of transformer and / or controller, resulting in distortion of the measurement result, in addition, because the test motor is suddenly short-circuited, the speed is attenuated instantaneously, so the short-circuit current value tested at this time is not the short-circuit current value under the specified speed, and the test result is inaccurate. UTILITY MODEL CONTENTS
[0005] The utility model discloses a kind of permanent magnet motor short circuit current test equipment to solve the problem of inaccurate permanent magnet motor short circuit current detection in prior art.
[0006] To achieve the above object, the utility model adopts the following technical scheme:
[0007] A kind of permanent magnet motor short circuit current test equipment, including measured motor, driving mechanism, test bench, the measured motor, driving mechanism are all fixed on test bench, the measured motor, driving mechanism are all connected computer module, the power output end of driving mechanism is transmissionally connected with the rotation of measured motor, the computer module can control driving mechanism movement, the computer module can realize at least one action of short circuit, cut-off to measured motor, the computer module can detect, analyze the first data when measured motor action.
[0008] The first data is current data, and the computer module can analyze the current data and generate a first waveform diagram.
[0009] The first waveform diagram is a real-time waveform diagram of the current data, and the real-time waveform diagram includes a short-circuit interval waveform and a short-circuit interval waveform.
[0010] The short-circuit interval waveform in the real-time waveform diagram includes an oscillation zone and a stable zone, wherein the oscillation zone is used to collect a maximum value and a minimum value of a short-circuit current, and the stable zone is used to calculate an effective value of the short-circuit current.
[0011] And / or the computer module can analyze the current data and generate characteristic values, and the characteristic values include at least one of a maximum value, a minimum value and an effective value of a current of the measured motor in a set time interval in a short-circuit state.
[0012] The driving mechanism is a servo motor, and a speed fluctuation of the servo motor is ≤0.01%.
[0013] The driving mechanism is a servo motor, and a stable output torque of the servo motor at all test speeds is ≥1.2*braking torque generated by the measured motor in a short-circuit state.
[0014] The computer module includes a computer, a data acquisition module and a short-circuit / circuit breaking module, the computer is electrically connected with the driving mechanism, the data acquisition module and the short-circuit / circuit breaking module respectively, the data acquisition module and the short-circuit / circuit breaking module are electrically connected with the measured motor respectively, the computer can control the speed of the driving mechanism, the computer can acquire current data of the measured motor in action through the data acquisition module and generate a waveform diagram of the current data, and the computer can control the measured motor to be short-circuited and broken through the short-circuit / circuit breaking module.
[0015] The short-circuit / circuit breaking module includes an electromagnetic relay electrically connected with the computer, and the electromagnetic relay can short-circuit and break the winding of the measured motor.
[0016] The permanent magnet motor short-circuit current test equipment has the beneficial effects that: the driving mechanism is used to drive the measured motor, and a transformer and / or a controller are not used, so that the influence of impedance on the test result is avoided from the source; the driving mechanism is used to drive the measured motor, so that there is no problem of speed attenuation when the measured motor is short-circuited, thereby ensuring the authenticity and accuracy of the test result. BRIEF DESCRIPTION OF DRAWINGS
[0017] Fig. 1 It is a structural schematic diagram of the utility model;
[0018] Fig. 2The utility model discloses a measured motor under different speed short circuit current change trend's schematic diagram.
[0019] Fig. 3 The utility model discloses test data and waveform's schematic diagram.
[0020] In the drawing: computer 1, data acquisition module 2, short circuit / break module 3, measured motor 4, drive mechanism 5. Specific implementation
[0021] The utility model discloses an embodiment will be clearly and completely described below with the drawings in the embodiment of the utility model, obviously, the described embodiment only is a part of embodiment of the utility model, not all the embodiment.
[0022] Reference Figs. 1-3 A kind of short circuit current test equipment of permanent magnet motor, including measured motor 4, drive mechanism 5, test bench, measured motor, drive mechanism are fixed on test bench, measured motor 4, drive mechanism 5 are all connected computer module, the power output end of drive mechanism 5 is transmission connection with the rotating part of measured motor 4, computer module can control drive mechanism 5 movement, computer module can realize at least one action of short circuit, break in measured motor 4, computer module can detect, analyze the first data when measured motor 4 action.
[0023] When the device tests, the rotating shaft of measured motor 4 is rotated by drive mechanism 5, so that measured motor 4 is passively rotated, in the process of measured motor 4 being rotated by drive, short circuit, breakage etc.
[0024] The utility model uses drive mechanism to drive measured motor, and does not use transformer and / or controller, avoids the influence of its impedance on test result from the root;
[0025] The utility model uses drive mechanism to drive measured motor, so when measured motor short circuit, there is no problem of speed attenuation, thereby guarantee the authenticity and accuracy of test result.
[0026] The first data is current data, and the computer module can analyze the current data and generate the first waveform graph;The first waveform graph is the real-time waveform graph of current data, and the real-time waveform graph includes the breakage interval waveform and the short circuit interval waveform, which can better reflect the current data of various states.
[0027] The short circuit interval waveform in the real-time waveform graph includes the oscillation zone and the stable zone, wherein the oscillation zone is used to collect the maximum and minimum values of the short circuit current, and the stable zone is used to calculate the effective value of the short circuit current.
[0028] And / or computer module can analyze current data and generate characteristic values, the characteristic values include at least one of the maximum, minimum, effective value of the measured motor 4 in the short circuit state in the set time interval. Facilitate the tester to watch, judge.
[0029] And the utility model disc not improve the test speed constantly, until the short circuit current of measured motor tends to be stable, as Fig. 2 As shown, so as to judge the rationality of the magnetic circuit design of the measured motor.
[0030] The driving mechanism is a servo motor, and the servo motor has a speed fluctuation of less than or equal to 0.01%. The smaller the speed fluctuation of the servo motor is, the more accurate the test result is.
[0031] The driving mechanism is a servo motor, and the servo motor has a stable output torque of greater than or equal to 1.2 times the braking torque generated by the measured motor 4 when short-circuiting. If the braking torque of the measured motor when short-circuiting is greater than the output torque of the driving motor, the servo motor will lose synchronization or be blocked when short-circuiting due to insufficient output torque. The 1.2 times is a margin reserved under normal circumstances.
[0032] The computer module includes a computer 1, a data acquisition module 2, and a short-circuiting / circuit-breaking module 3. The computer 1 is electrically connected to the driving mechanism 5, the data acquisition module 2, and the short-circuiting / circuit-breaking module 3. The data acquisition module 2 and the short-circuiting / circuit-breaking module 3 are electrically connected to the measured motor 4. The computer 1 can control the speed of the driving mechanism 5. The computer 1 can obtain current data of the measured motor 4 in action through the data acquisition module 2 and generate a waveform graph of the current data. The computer 1 can control the measured motor 4 to short-circuit or break circuit through the short-circuiting / circuit-breaking module 3.
[0033] The short-circuiting / circuit-breaking module 3 includes an electromagnetic relay electrically connected to the computer 1. The electromagnetic relay can short-circuit or break the winding of the measured motor 4.
[0034] A permanent magnet motor short-circuit current testing method includes the permanent magnet motor short-circuit current testing device. The testing method includes the following steps: rotating the driving mechanism 5 through the computer 1, driving the measured motor 4 to rotate to a specified speed and stably operating through the driving mechanism 5, controlling the short-circuiting / circuit-breaking module 3 to act through the computer 1 to make the measured motor 4 to at least one of short-circuit or break circuit at the specified speed, simultaneously collecting real-time values of the measured motor 4 through the data acquisition module 2 and feeding back to the computer 1, and analyzing and generating a first waveform graph of the current data of the measured motor 4 in the short-circuiting or circuit-breaking state through the computer 1.
[0035] The instantaneous value of the current is collected in real time by the computer module, the real-time current waveform and data of the motor winding in the open circuit, short circuit and open circuit states are generated in real time, the maximum value, minimum value and effective value in the specified waveform interval are calculated after the test is completed, and the waveform and data are stored, and through the observation and analysis of the waveform and data, whether the test result is abnormal can be preliminarily judged.
[0036] In order to test more accurately, the first waveform diagram is a real-time waveform diagram, and the real-time waveform diagram includes an open circuit interval waveform and a short circuit interval waveform.
[0037] As an embodiment, the open circuit interval waveform can include a first open circuit interval waveform and a second open circuit interval waveform, and the short circuit interval waveform is located between the first open circuit interval waveform and the second open circuit interval waveform, wherein the first and the second are only for distinguishing description and have no actual meaning.
[0038] Reference Fig. 3 The method starts the current test in the open circuit state, at this time, since the motor winding to be tested is open, no current is generated in the winding, and at this time, the test is started, only to test the current change at the moment of short circuit when short circuit occurs. After the short circuit test, the circuit is disconnected, because the motor generates a lot of heat in the short circuit state, in order to avoid long-time short circuit, the circuit is quickly disconnected after a period of short circuit. The time of short circuit is generally guaranteed to stabilize the current in each phase winding to a certain value, which is generally stable within 5-50 electrical periods, and the specific value can be determined according to the waveform change of the current in the test process or according to the calculation of the electrical period.
[0039] As an embodiment, the motor to be tested is installed on the test platform, the servo motor is drivingly connected with the motor to be tested, the motor to be tested is driven by the servo motor to rotate at a specified speed; the short circuit module is started to short the winding of the motor to be tested, and the winding is disconnected after a period of operation in the short circuit state (which can be set according to requirements); the data acquisition module records the related current data in real time, and the corresponding curve and related characteristic value are generated by the computer.
[0040] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any skilled person in the art can obtain the technical solutions, concepts and designs according to the technical scheme and concept of the present application within the technical range disclosed by the present application, and the obtained technical solutions, concepts and designs should be covered within the protection scope of the present application.
Claims
1. A short circuit current test device for a permanent magnet electric machine, characterized by, Including the motor (4) to be measured, drive mechanism (5), test bench, the motor (4) to be measured, drive mechanism (5) are fixed on the test bench, the motor (4) to be measured, drive mechanism (5) are connected computer module, the power output end of drive mechanism (5) is transmission connection with the rotating part of the motor (4) to be measured, the computer module can control drive mechanism (5) movement, the computer module can realize at least one action of short circuit, open circuit to the motor (4) to be measured, the computer module can detect, analyze the first data when the motor (4) to be measured acts.
2. The short circuit current test device for a permanent magnet motor according to claim 1, characterized by, The first data is current data, and the computer module can analyze the current data and generate a first waveform graph.
3. The short circuit current test device for permanent magnet machines according to claim 1, characterized in that, The drive mechanism is a servo motor, and the servo motor speed fluctuation is less than or equal to 0.01%.
4. The short circuit current test device for permanent magnet machines according to claim 1, characterized in that, The drive mechanism is a servo motor, and the servo motor has a stable output torque greater than or equal to 1.2 times the braking torque generated by the motor (4) to be measured when short-circuiting.
5. A short circuit current test device for a permanent magnet electric machine according to any one of claims 1 to 4, characterized in that, The computer module includes a computer (1), a data acquisition module (2), and a short-circuit / open-circuit module (3), the computer (1) is respectively connected with drive mechanism (5), data acquisition module (2), short-circuit / open-circuit module (3), the data acquisition module (2), short-circuit / open-circuit module (3) are respectively connected with the motor (4) to be measured, the computer (1) can control the speed of drive mechanism (5), the computer (1) can obtain the current data of the motor (4) to be measured through the data acquisition module (2) when the motor (4) to be measured acts, and generate a waveform graph of the current data, the computer (1) can control the motor (4) to be measured short-circuit, open circuit through the short-circuit / open-circuit module (3).
6. A short circuit current test device for a permanent magnet electric machine according to claim 5, characterized in that, The short-circuit / open-circuit module (3) includes an electromagnetic relay connected with the computer (1), and the electromagnetic relay can short-circuit and open-circuit the winding of the motor (4) to be measured.