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Noise testing method for multi-phase alternating-current permanent magnet motor with 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: 2015-02-25
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 testing method for multi-phase alternating-current permanent magnet motor with odd number of units
  • Noise testing method for multi-phase alternating-current permanent magnet motor with odd number of units
  • Noise testing method for multi-phase alternating-current permanent magnet motor with odd number of units

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specific Embodiment approach 1

[0026] Specific implementation mode 1: Combination Figure 1 to Figure 3 In this embodiment, the noise test method of the multi-phase odd unit AC permanent magnet motor described in this embodiment is described. The stator winding of the motor has N independent operating units, and each independent operating unit is a 3-phase symmetrical AC winding. The number of phases of the motor is 3N, where N is an odd number greater than 3. The method includes the following steps:

[0027] Step 1: Measure the curve of the self-inductance and mutual inductance of the stator winding with the rotor position in an electrical cycle;

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

[0029] Step three:

[0030] Using the three-phase current of the motor, the curve obtained in step 1 and the no-load air ga...

specific Embodiment approach 2

[0043] Embodiment 2: This embodiment further defines the noise test method of the multi-phase odd-numbered unit AC permanent magnet motor described in Embodiment 1. In step 1, the self-inductance and mutual inductance of the stator winding are measured in one electric cycle. The curve method of rotor position change is:

[0044] Add DC power to an independent operating unit to make the motor at any position, add a sinusoidal AC voltage signal with a DC offset to both ends of a phase winding of the independent operating unit, the voltage component of the DC offset and 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 to obtain the stator winding self-inductance and the mutual inductance with other stator windings when the motor is in the position, and change the direct current vector in the power-on unit to make the motor in other positions, thereby Measure the ...

specific Embodiment approach 3

[0046] Embodiment 3: This embodiment further defines the noise test method of the multi-phase odd-numbered unit AC permanent magnet motor described in Embodiment 1. In step 3, the sound power of the motor in the ideal operating state is compared with the current The specific expression of equal sound power of noise generated by the motor in the running state is:

[0047] X i = 1 . . . n ( B ′ i ( θ , t ) ) 4 = X i = 1 . . . n B i ( θ , t ) 4

[0048] Among them, B′ i(θ,t) For this reason, the air gap magnetic density of the i-th stator tooth surface of the motor in the running state, B i(θ,t) Is the air gap flux density of the surface of the i-th stator tooth of the motor in the ideal operating state; n is the number of stator teeth, θ is the space angle value from the winding axis of the first operating independent unit, and t is the current time;

[0049] The air gap flux density...

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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 measuring the noise of permanent magnet synchronous motors: sound pressure level measurement, sound intensity measurement, and vibration test method. These three test methods can be prepared to measure the noise of the motor according to the required test environment and equipment conditions, but there are also some problems in the noise test of high-power motors. Generally, testing the torque of the motor requires an external dynamometer or 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 has a low running speed (generally no more than 200rpm) and a large torque, a large-capacity DC motor and its auxiliary equipment are required as a load. Some laboratories or The research institute does not have the...

Claims

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Application Information

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Patent Type & Authority Applications(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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