Four-phase six-bridge arm inverter with high fault-tolerant capability

Abstract

The invention provides a four-phase six-bridge arm inverter with high fault-tolerant capability, belongs to the field of the control of a motor, and aims at solving the problems that a four-phase half-bridge inverter can not be used for controlling a four-phase permanent magnet synchronous motor with a 45-degree phase belt angle, and a four-phase full-bridge inverter can be used for controlling the four-phase permanent magnet synchronous motor with high. The four-phase six-bridge arm inverter with the high fault-tolerant capability comprises a four-phase half-bridge topological structure; and the output end of each bridge arm is connected with a phase winding, two phase windings with a 90-degree mutual-deviation mechanical angle is taken as one group, one bridge arm is additionally arranged in every group, the two additionally arranged bridge arms jointly control an electric current zero-sequence component of each phase winding, and output current branches of the two bridge arms are connected with a bi-directional breakover diode in series for fault isolation. When a fault occurs, the amplitude value and the phase of each phase of current excitation are adjusted, a circular rotating magnetic field is rebuilt, and the work of a motor can be kept. The arm inverter is used for driving four-phase permanent magnet synchronous motors with 45-degree and 90-degree phase belt angles.

Description

Technical field [0001] The invention relates to a four-phase six-arm inverter with high fault tolerance, and belongs to the field of motor control. Background technique [0002] The four-phase permanent magnet synchronous motor has the advantages of high power density, high efficiency, high fault tolerance, and the number of phases is only one more phase than the traditional three-phase motor, and the manufacturing cost is lower. From the motor body structure, the four-phase permanent magnet synchronous motor can be divided into a four-phase permanent magnet synchronous motor with a 90° phase band angle and a four-phase permanent magnet synchronous motor with a 45° phase band angle. Among them, a four-phase permanent magnet synchronous motor with a 90° phase band angle has the same magnetic circuit as a two-phase motor; while a four-phase permanent magnet synchronous motor with a 45° phase band angle has less air gap magnetomotive force content and small torque ripple , Is an ex...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the four-phase half-bridge inverter cannot control the four-phase permanent magnet synchronous motor with a phase belt angle of 45°, and the cost of controlling the four-phase permanent magnet synchronous motor by the four-phase full-bridge inverter is high problem, providing a four-phase six-leg inverter with high fault tolerance

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