Fault tolerant system and method of single-phase winding short circuit of three-phase permanent magnet synchronous motor of open winding

Abstract

The invention discloses a fault tolerant system and method of a single-phase winding short circuit of a three-phase permanent magnet synchronous motor of an open winding. A current regulation function machine generates normal phase initial reference currents, short circuit phase currents compensate the normal phase initial reference currents, final reference currents are formed, and finally the final reference currents and double inverter normal phase currents are compared through a current hysteresis comparator to generate double inverter normal phase switching signals to double inverters. Compensation of the short circuit phase currents for the normal phase currents eliminates the influence of fault phase currents on motor torque, the purpose of tolerance of single-phase winding short circuit faults is achieved, the current use ratio of the motor winding is improved, and stable torque can be output.

Description

technical field [0001] The invention relates to the field of permanent magnet synchronous motor control, in particular to an open-winding three-phase permanent magnet synchronous motor single-phase winding short-circuit fault-tolerant system and fault-tolerant method. Background technique [0002] In recent years, multi-level dual inverters have been successfully used in high-power fields such as aerospace and electric vehicles due to their good performance. Among them, dual inverters have the advantage of three levels. Compared with other three-level dual inverters The device effectively avoids problems such as the voltage offset of the midpoint of the capacitor, and can realize self-reconfiguration after a fault without adding an additional switch tube. Since the operating status of the permanent magnet synchronous motor is related to the overall operating status of the drive system, the fault detection and fault tolerance of the permanent magnet synchronous motor drive sy...

AI Technical Summary

Problems solved by technology

[0005] In view of this, in order to solve the problems of severe torque oscillation and low current utilization rate due to the short circuit of the single-phase winding of the open-winding three-phase permanent magnet synchronous motor, the present invention provides an open-winding three-phase permanent magnet synchronous motor single-phase winding short circuit Fault-tolerant system and fault-tolerant method to achieve stable motor output torque and high current utilization

[0006] In order to solve the problem of low current utilization, the present invention provides an open-winding three-phase permanent magnet synchronous motor single-phase winding short-circuit fault-tolerant system, including:

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