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A kind of dynamic eccentricity fault detection method of in-wheel motor

A wheel hub motor and fault detection technology, which is applied in the direction of motor generator testing, measuring devices, and electrical devices, can solve the problems of insufficient testing accuracy, complicated modification process, and complicated testing process, and achieve simple structure, high detection accuracy, and Simple calculation method

Active Publication Date: 2021-04-20
HARBIN INST OF TECH AT WEIHAI
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Problems solved by technology

[0009] The purpose of the present invention is to solve the disadvantages of insufficient test accuracy, large test error, complicated refitting process, complicated test process, incapable of mass production, and difficult to quickly apply in the above-mentioned prior art, and provide a simple structure, convenient use, and accurate Detection method for dynamic eccentricity faults of in-wheel motors

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  • A kind of dynamic eccentricity fault detection method of in-wheel motor
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  • A kind of dynamic eccentricity fault detection method of in-wheel motor

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Embodiment Construction

[0044] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0045] For a 24-pole 27-slot, rated speed n =600rpm outer rotor wheel hub permanent magnet synchronous motor for electric vehicles, the whole process detection is carried out according to the inventive method.

[0046] like figure 1As shown, it is a schematic diagram of the test bench for the no-load back EMF of the in-wheel motor, which is equipped with a test platform 1, a dynamometer 4 for dragging the tested in-wheel motor, and data acquisition and analysis for measuring the no-load back EMF of the in-wheel motor unit motor Module 2. The test platform 1 is provided with a fixture 3 for supporting and clamping the dynamometer 4, a coupling 5 connected with the output shaft of the dynamometer, and a torque speed sensor 6 connected with the coupling 5, and then connected to the The in-wheel motor 9 to be tested is clamped by special in-w...

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Abstract

A method for detecting a dynamic eccentricity fault of a wheel hub motor, which involves a detection method for a motor fault. The steps are as follows: determine the type of the motor, and set a voltage test line for the unit motor; Calculate its standard deviation for all its maximum values; test standard motors with known different dynamic eccentricities, and obtain the linear relationship between dynamic eccentricity and standard deviation D=aσ Coefficients in a ,in, D is the dynamic eccentricity, σ is the standard deviation; substituting the standard deviation obtained in step 4 into the linear relational formula can determine whether there is dynamic eccentricity and the degree of dynamic eccentricity of the in-wheel motor to be tested. The present invention is aimed at the wheel hub motor which itself is a unit motor, without any modification, and can detect whether there is dynamic eccentricity and the degree of eccentricity by simply performing a simple and conventional no-load back electromotive force test. The operation process and calculation method of the present invention are very simple, and the test data is accurate.

Description

technical field [0001] The invention relates to a detection method for motor faults, more specifically an accurate detection method for dynamic eccentric faults of hub motors. Background technique [0002] Hub motor drive is a direct drive method, the motor is directly connected to the wheel to drive the vehicle forward. As a superior driving method, in-wheel motor drive is widely used in distributed drive electric vehicles, electric bicycles and other fields. It has the advantages of simple mechanical connection structure, short drive chain, and independent control of each wheel. But at the same time, the in-wheel motor is used as a driving motor, and the wheel connected to the motor is directly in contact with the road surface, so it is very vulnerable to factors such as poor road surface quality, harsh operating conditions, and obvious load changes. Machining errors can easily lead to eccentric failures of the hub motor stator and rotor. In turn, the air gap magnetic f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B7/312G01R31/34
CPCG01B7/312G01R31/34
Inventor 马琮淦周生森李琼瑶高毓娇张京京牟原野
Owner HARBIN INST OF TECH AT WEIHAI
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