Permanent magnet synchronous motor inter-turn shorted-circuit fault diagnosis method

A technology for inter-turn short circuit faults and permanent magnet synchronous motors, which is applied in the direction of motor generator testing, measurement of electricity, and measurement of electrical variables, and can solve problems such as excessive temperature of motor stator windings and failure of inter-turn insulation

Active Publication Date: 2016-12-07
HUNAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] (2) The temperature of the motor stator winding is ...

Method used

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  • Permanent magnet synchronous motor inter-turn shorted-circuit fault diagnosis method
  • Permanent magnet synchronous motor inter-turn shorted-circuit fault diagnosis method

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Experimental program
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Effect test

Embodiment 1

[0030] Such as figure 1 As shown, a permanent magnet synchronous motor turn-to-turn short circuit fault diagnosis method includes the following steps:

[0031] S1: Collect the current signal of any phase at the stator end of the motor and use the Nicholas data acquisition instrument to perform fast Fourier transform to obtain the amplitude I of the fundamental component 1 and the magnitude of the 5th harmonic component I 5 ;

[0032] S2: According to current 5th harmonic amplitude I 5 Calculate the 5th harmonic content HRX 5 , let HRX 5 is the fault characteristic C;

[0033] S3: Determine the 5th harmonic content of any phase current at the stator end when the motor is running normally, and set the 5th harmonic content of the current as the fault warning threshold B;

[0034] S4: The ratio of the fault feature C to the fault warning threshold B is the fault factor k, and it is judged whether the motor has an inter-turn short circuit fault according to the magnitude of t...

Embodiment 2

[0039] Such as figure 2 As shown, a diagnosis system applying the method for diagnosing the turn-to-turn short-circuit fault of the permanent magnet synchronous motor in Embodiment 1, the system includes a rectifier circuit 2 connected to the power grid 1, and the rectifier circuit 2 is connected to the inverter circuit 3 for powering the permanent magnet synchronous motor. The magnetic synchronous motor 4 supplies power to drive the load 5 . The Hall speed sensor 6 is connected with the controller 7 and the permanent magnet synchronous motor 4, and is used to obtain the rotor rotation angle of the permanent magnet synchronous motor, and input the rotor rotation angle into the controller 7, and the controller 7 is based on the difference between the feedback signal and the given signal The value generation control signal is input to the inverter circuit 3 . After all the above modules are connected, a closed-loop control system is formed.

[0040] When the system is working...

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Abstract

The invention provides a permanent magnet synchronous motor inter-turn shorted-circuit fault diagnosis method. The method uses a Hall current sensor to collect a current signal at a stator end. The current signal is subjected to FFT analysis using a Nicolet data acquisition instrument, then the harmonic amplitude is processed, a fault coefficient of the collected current signal is compared with a preset fault coefficient, and that whether the permanent magnet synchronous motor has an inter-turn shorted-circuit fault or not is determined.

Description

technical field [0001] The invention relates to the field of motor fault diagnosis methods, and more specifically, to a method for diagnosing inter-turn short circuit faults of permanent magnet synchronous motors. Background technique [0002] Stator faults of permanent magnet motors are mainly inter-turn short-circuit faults. Surveys show that 80% of stator faults are caused by inter-turn short circuits. When inter-turn short circuits occur, the short-circuit coil will generate a magnetomotive force opposite to other coils. Therefore, the direction of the magnetic field generated by the short-circuit coil is opposite to that of the combined air-gap magnetic field, which induces demagnetization of the generator. [0003] Turn-to-turn short circuit is a common failure of permanent magnet synchronous motors. There are many reasons for the failure, and the causes are very complicated, but generally it can be simply attributed to the following four points: [0004] (1) Turn-t...

Claims

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Application Information

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IPC IPC(8): G01R31/34G01R31/06
CPCG01R31/343G01R31/72
Inventor 张昌凡罗利祥何静赵凯辉李祥飞林真珍唐沛钦殷晓飞
Owner HUNAN UNIV OF TECH
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