Six-phase permanent magnet fault-tolerant motor control system

Abstract

The invention relates to a novel six-phase permanent magnet fault-tolerant motor control system in a half-bridge circuit structure, which has the characteristic of failure isolation. The system comprises a six-phase permanent magnet fault-tolerant motor and two paths of three-phase half-bridge inverting circuits. Aiming at the six-phase permanent magnet fault-tolerant motor, one end of an A-phasewinding, one end of a C-phase winding and one end of an E-phase winding are connected with a midpoint of a corresponding bridge arm, and the lower end of the bridge arm is connected with the negativeend of a direct current bus after being connected in series with a normally-closed contact point and a PTC resistor; the other ends of all windings are connected to form a Y-shaped connecting method after being connected in series with the other normally-closed contact point; and the two normally-closed contact points in the same phase belong to the same double-connecting relay. The midpoint of the Y-shaped connecting method is connected with a midpoint of an equivalent bus series capacitor after being connected in series with the normally-opened contact point K1 to form a set of three-phase Y-shaped drive subsystems. Similarly, other three phases form a set of three-phase drive subsystems by the circuit structure. When any phase in any set generates failure, a failure subsystem is automatically reconstructed into a two-phase system, and the motor system enters a fault-tolerant running state by a failure state two-phase control algorithm of a common three-phase motor.

Description

technical field [0001] The patent of the present invention relates to a design method of a six-phase permanent magnet fault-tolerant motor control system. Background technique [0002] In some occasions with high reliability requirements, the motor drive system must be specially designed, such as the aircraft electric actuation system, which is one of the key technologies of the multi-electric aircraft system. Since electric actuation systems are widely used in key electric drive systems such as aircraft brakes, rudder control, and oil pumps, the electric actuation system must have strong safety reliability and fault tolerance. The power converter and driving motor are the core parts of the electric actuator, so designing a set of motor body and its control system with fault-tolerant function has become the key technology of the electric actuator. It is precisely because of the awareness of this problem that the research on the reliability technology of the electric actuati...

AI Technical Summary

Problems solved by technology

The disadvantage is that more power devices are needed, which increases the volume and weight. For example, a six-phase permanent magnet fault-tolerant motor needs 6 H-bridges and a total of 24 power switch tubes, which will affect the reliability of the system.

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