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Noise test method for AC permanent magnet motor with polyphase odd number of units

A permanent magnet motor, noise testing technology, applied in the direction of motor generator testing, noise coefficient or signal-to-noise ratio measurement, etc., can solve the problems affecting the accurate testing of motor system noise, and achieve the effect of simple structure, stable performance and reliable data

Active Publication Date: 2017-05-03
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of accurately testing the noise of the motor system due to the need for additional load equipment when testing the noise of multi-phase odd-numbered unit permanent magnet synchronous motors. The present invention provides a multi-phase odd-numbered unit AC permanent magnet motor noise test method

Method used

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  • Noise test method for AC permanent magnet motor with polyphase odd number of units
  • Noise test method for AC permanent magnet motor with polyphase odd number of units
  • Noise test method for AC permanent magnet motor with polyphase odd number of units

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specific Embodiment approach 1

[0026] Specific implementation mode one: combine Figure 1 to Figure 3 Describe this embodiment, the polyphase odd unit AC permanent magnet motor noise test method described in this embodiment, the stator winding of the motor has N independent operation units, each independent operation unit is a 3-phase symmetrical AC winding, the The number of phases of the motor is 3N, wherein N is an odd number greater than 3; the method includes the following steps:

[0027] Step 1: Measure the curves of the self-inductance and mutual inductance of the stator winding changing with the rotor position within one electrical cycle;

[0028] Step 2: Use the motor to drive the motor to run at a constant speed without load, measure the back EMF of the winding line of the motor at this time, and then calculate the no-load air gap magnetic density through the obtained waveform of the line back EMF;

[0029] Step three:

[0030] Using the three-phase current of the motor, the curve obtained in st...

specific Embodiment approach 2

[0043] Specific embodiment 2: This embodiment is a further limitation of the multi-phase odd unit AC permanent magnet motor noise test method described in specific embodiment 1. In step 1, the self-inductance and mutual inductance of the stator windings are measured with The method of the curve of rotor position change is:

[0044] Add direct current in an independent operation unit to make the motor be in any position, and add a sinusoidal alternating voltage signal with a direct current bias to both ends of a phase winding of the independent operation unit, and the voltage component of the direct current bias is related to the operating state to be tested The voltage of the lower phase winding is equal;

[0045] Measure the current of the phase winding and the current of other phase windings, so as to obtain the self-inductance of the stator winding and the mutual inductance with other stator windings when the motor is in the position, and change the DC vector in the power s...

specific Embodiment approach 3

[0046] Specific embodiment three: This embodiment is a further limitation of the multi-phase odd unit AC permanent magnet motor noise test method described in specific embodiment one. In step three, the sound power of the noise generated by the motor under the ideal operating state is the same as that at this time. The specific expression of the equal sound power of the noise generated by the motor in the running state is:

[0047]

[0048] Among them, B' i(θ，t) This is the air-gap flux density on the i-th stator tooth surface of the motor in the running state at this time, B i(θ，t) is the air gap flux density on the surface of the i-th stator tooth of the motor under ideal operating conditions; n is the number of stator teeth, θ is the space angle value from the winding axis of the first running independent unit, and t is the current time;

[0049] The motor air gap flux density obtained under the ideal operating state is:

[0050] Among them, N z is the number of tur...

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Abstract

The invention discloses a noise testing method for a multi-phase alternating-current permanent magnet motor with an odd number of units, and belongs to the technical field of motor testing. The noise testing method aims to solve the problem that accurate testing of noise of a motor system is affected due to the fact that load equipment needs to be additionally arranged when noise of the multi-phase permanent magnet synchronous motor with the odd number of units is tested. According to the method, in the N independently running units of the motor, N1 units run electrically to serve as an input power end, the other N2 units run in a power-generating mode to serve as a power output end, and the noise of the motor in the state is tested; and noise generated when any one unit runs electrically and the adjacent unit runs in the power-generating mode is tested according to a relevant motor parameter equivalent testing method; finally, noise generated when the motor runs in a no-load mode is tested, and the noise of the motor in a normal output state is worked out through the noise obtained in the three times. The noise of the motor in any output power state can be tested equivalently by simply changing load resistance of a power generating unit. The noise testing method is used for testing the noise of the multi-phase alternating-current permanent magnet motor with the odd number of units.

Description

technical field [0001] The invention belongs to the technical field of motor testing. Background technique [0002] At present, there are three main methods for testing the noise of permanent magnet synchronous motors: sound pressure level measurement, sound intensity measurement, and vibration testing. These three test methods can measure the noise of the motor relatively well according to the required test environment and equipment conditions, but there are also some problems in the noise test of high-power motors. In general, testing the torque of a motor requires an external dynamometer or a mechanical load device as a load, which increases the equipment conditions required for the test. For the high-power low-speed permanent magnet synchronous motor, which operates at a low speed (generally no more than 200rpm) and has a large torque to be tested, a large-capacity DC motor and its auxiliary equipment are required as loads. Some laboratories or The research institute s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R29/26G01R31/34
Inventor 邹继斌曾德鹏徐永向王骞李勇尚静胡建辉刘承军赵猛赵博江善林
Owner HARBIN INST OF TECH
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