Switched reluctance motor rotor position square wave signal fault diagnosis and fault tolerance method

A technology of switched reluctance motor and square wave signal, which is applied in the direction of AC motor control, estimation/correction of motor parameters, electrical components, etc., and can solve problems such as power converter damage and motor stall, so as to improve reliability, Avoid control failure and realize the effect of real-time fault monitoring and diagnosis

Active Publication Date: 2015-12-16
JIANGSUSNGQI GROUP
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Problems solved by technology

For switched reluctance motors, the conventional detection method is to use photoelectric and Hall sensors for position detection, and the output position search pulse is usually a multi-channel square wave signal.

Method used

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  • Switched reluctance motor rotor position square wave signal fault diagnosis and fault tolerance method
  • Switched reluctance motor rotor position square wave signal fault diagnosis and fault tolerance method
  • Switched reluctance motor rotor position square wave signal fault diagnosis and fault tolerance method

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Embodiment Construction

[0030] Below in conjunction with accompanying drawing of description, the present invention will be further described.

[0031] The invention provides a method for fault diagnosis and fault tolerance of a square wave signal of a rotor position of a switched reluctance motor, comprising the following steps:

[0032] 1) Detect the square wave signal of the rotor position of the switched reluctance motor through several position sensors, and perform Fourier spectrum analysis within the square wave period on the detected square wave signal to obtain the harmonic content; determine the Fourier frequency within the square wave period Whether the second harmonic coefficient in the harmonic content obtained by leaf frequency spectrum analysis is zero, if the second harmonic coefficient is not zero, it is diagnosed that the position square wave signal output by the position sensor of the road is faulty, if the second harmonic coefficient is If it is zero, it is diagnosed that the posit...

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Abstract

The invention discloses a switched reluctance motor (SRM) rotor position square wave signal fault diagnosis and fault tolerance method, comprising the steps of: performing Fourier expansion spectrum analysis on the position square wave signal outputted by an SRM position sensor; diagnosing in real time whether the position square wave signal goes wrong by checking whether a secondary harmonic coefficient is zero; determining that the position sensor is out of order if the secondary harmonic coefficient is not zero, thereby realizing real time fault monitoring and diagnosis; and based on a position signal fault tolerance control method after a position square wave signal fault, utilizing residual normal position square wave signals to calculate a rotor rotating speed and to estimate an average rotating speed after the diagnosis that the position square wave signal outputted by the position sensor goes wrong, and utilizing the average rotating speed to calculate a rotor position to realize fault tolerance control after position square wave signal faults, thereby improving the reliability of an SRM driving system, and avoiding SRM control failure caused by rotor position signal decoding disorder.

Description

technical field [0001] The invention relates to a fault diagnosis and fault tolerance method, in particular to a fault diagnosis and fault tolerance method for a square wave signal of a rotor position of a switched reluctance motor, belonging to the technical field of motor signal detection. Background technique [0002] The switched reluctance motor itself has important characteristics such as simple and sturdy structure, suitable for high-speed, high-temperature operation, and strong fault tolerance. Position detection is one of the most critical links in the switched reluctance motor system, and it is also a weak link. The accuracy and reliability of the position signal directly affect the control performance of the switched reluctance motor system, and are important indicators related to the strong fault tolerance of the switched reluctance motor itself. [0003] Traditional position detectors are mainly photoelectric encoders, magnetic sensors, eddy current sensors and...

Claims

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Application Information

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IPC IPC(8): H02P25/08H02P23/14
Inventor 蔡骏胡荣光赵兴强贾红云
Owner JIANGSUSNGQI GROUP
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