Multiphase permanent magnet fault-tolerant motor control system in half-bridge structure

Abstract

The invention relates to a novel multiphase permanent magnet fault-tolerant motor control system in a half-bridge structure, which has the characteristic of failure isolation. The system comprises anM-phase permanent magnet fault-tolerant motor (1) and an M+1-phase half-bridge inverting circuit (2). One end of each phase winding of a permanent magnet fault-tolerant motor is connected with a midpoint of a corresponding half bridge, and the lower end of a bridge arm of the half bridge is connected with the negative end of a bus after being connected in series with a normally-closed contact point and a PTC resistor; the other ends of all the windings are connected to form a * shape connecting method after being connected in series with the other normally-closed contact point; and the two normally-closed contact points with the same phase belong to the same double-connecting relay. A midpoint of the * shape connecting method is also connected with the midpoint of a redundant phase half bridge, and the phase is a midpoint control bridge arm; both an upper bridge arm and a lower bridge arm are connected with the bus after being connected in series with the PTC resistor, and the lower end of the bridge arm is not connected in series with the normally-closed contact point. When any phase generates failure, the two normally-closed contact points of the phase are opened to isolate the failure phase, a motor system carries out unsymmetrical running and controls current flowing through the midpoint by combining a fault-tolerant control algorithm through the midpoint control bridge arm, and the motor system enters a fault-tolerant running state.

Description

technical field [0001] The patent of the present invention relates to a design method of a multi-phase permanent magnet fault-tolerant motor control system. Background technique [0002] In occasions with high reliability requirements, the motor drive system must be specially designed, such as the aircraft electric actuation system. Electric actuation is widely used in key systems that affect flight safety, such as aircraft control, environmental control, wheel brakes, and fuel control. Since the motor and its control drive system may have faults such as short circuit and open circuit, the motor will run asymmetrically after the fault, and the output torque will fluctuate greatly, resulting in large mechanical noise, and the overall performance of the system will be greatly reduced. , the output power will be greatly reduced, and even cause it to fail to work. Therefore, the fault-tolerant control capability of the motor drive system in the event of a fault has become a ve...

AI Technical Summary

Problems solved by technology

However, its disadvantage is that it requires more power devices. For example, a six-phase permanent magnet motor system needs to use six H-bridges, with a total of 24 power switch tubes, resulting in increased volume and weight, which will affect system reliability.

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