A fault diagnosis method for permanent magnet fault-tolerant motor position sensor

Abstract

The invention discloses a fault diagnosis method for a position sensor of a permanent magnet fault-tolerant motor. The method is as follows: first construct a permanent magnet fault-tolerant motor drive system, complete the construction of each module and the integration of the entire drive system; secondly, through mathematical modeling, complete the classification and induction of common faults of the permanent magnet fault-tolerant motor position sensor; and then measure and calculate the time t The rotor position signal value of the rotor and the signal estimation value under the non-position algorithm; finally, according to the fault diagnosis criteria of the permanent magnet fault-tolerant motor position sensor, the fault diagnosis of the motor position sensor is carried out and the specific fault type is determined. The invention is simple and easy to implement, high in reliability, rapid in diagnosis process and accurate in fault result judgment, improves the operation stability of the position sensor, and enhances the robustness of the motor drive system.

Description

technical field [0001] The invention relates to the technical field of fault diagnosis of permanent magnet fault-tolerant motors, in particular to a fault diagnosis method for a position sensor of a permanent magnet fault-tolerant motor. Background technique [0002] With the development of multi-electric, all-electric aircraft and hybrid and pure electric vehicles, the motor drive system has ushered in new development opportunities and challenges. In addition to requiring high power density and high efficiency, it also needs to have high output performance and high reliability. performance, which has become the key to the motor drive system. In the 1990s, the permanent magnet fault-tolerant motor and its control system appeared, which improved the safety and reliability of the system, and have now been applied to the aviation field. However, for the permanent magnet fault-tolerant motor drive system, some sensor failures often occur, and the accuracy of the feedback of eac...

AI Technical Summary

Problems solved by technology

However, the fault diagnosis methods of sensors can be roughly divided into hardware methods and software methods. The hardware fault diagnosis methods for position sensors are usually effective and feasible for a small number of position sensor faults. However, if a large number of position sensors of the same electrical equipment fail, the The hardware detection method will have a series of slow diagnosis speed and large resource consumption, which means that the motor will run for more time in the fault state, increasing the loss and risk of the system

At the same time, there are also shortcomings such as the number of sensors and the need for electrical equipment, which will inevitably lead to problems such as complex design of the drive system, lack of intelligence in diagnostic methods, and failure to judge the type of fault.

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