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Fault diagnosis and fault-tolerant control method for brushless motor position signal

A brushless motor and fault diagnosis technology, applied in the direction of electronic commutator, monitoring commutation, etc., can solve the problem of position signal fault diagnosis and fault-tolerant control not involved, and achieve the effect of improving system reliability and broadening the scope of application.

Inactive Publication Date: 2007-05-30
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

The research on the position signal is limited to the adjustment method of the position signal and the simple description of the fault of the position signal, but the fault diagnosis of the position signal and the fault-tolerant control after the fault are not involved.

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  • Fault diagnosis and fault-tolerant control method for brushless motor position signal
  • Fault diagnosis and fault-tolerant control method for brushless motor position signal
  • Fault diagnosis and fault-tolerant control method for brushless motor position signal

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Embodiment Construction

[0035] 1 Types of position signal failures

[0036] The three-phase brushless motor needs three position sensors, and the three position sensors have a mutual difference of 120° in space. The position signal generated is shown in Figure 1. The 1 / 3 cycle is high level, and the 2 / 3 cycle is low level. The phase difference between the three position signals is 1 / 3 cycle. Position signal faults can be divided into three types: ① one-phase fault; ② two-phase fault; ③ three-phase fault. Among the three kinds of faults, the probability of failure of one-phase position signal is the highest, followed by two-phase failure, and the lowest failure rate is three-phase failure at the same time. There may be two states after the position signal fails:

[0037] ①Constantly low level, that is, H i ≡0, i=A, B, C;

[0038] ②Constantly high level, that is, H i ≡1, i=A, B, C.

[0039] For four-phase switched reluctance motors such as 8 / 6 poles and double salient poles, two position sensors ...

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Abstract

This invention relates to one brushless motor position signal fault diagnosis method and fault tolerant control method, which comprises the following steps: directly using position signal up or down along signal status to real time test signal fault kind; according to the fault kind, real time computing phase exchange information along triggering DSP capture interval type for modification.

Description

1. Technical field [0001] The invention relates to a real-time diagnosis method for the fault of a position signal of a brushless motor (a brushless DC motor, a switched reluctance motor, a double salient motor, etc.) and a fault-tolerant control method when the position signal fails. 2. Background technology [0002] For brushless motors, the position sensor is the key to proper commutation of the brushless motor. After the permanent effective failure of the position signal, the commutation logic of the motor is confused, the output torque decreases, and the motor speed drops or becomes zero. In some high-reliability systems or specific occasions, the system is not allowed to fail, or it should be able to continue to run for a period of time after a failure occurs, and then handle the failure. In order to improve the reliability of the system and enable the motor to output commutation information at the correct position, it is necessary to perform fault diagnosis and fault...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/12H02P6/14H02P6/16
Inventor 马长山周波
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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