Six-phase nine-leg inverter with high fault-tolerant ability

Abstract

The invention discloses a six-phase nine-leg inverter with a high fault-tolerant ability, belonging to the field of motor control and aiming to solve the problem that a huge risk exists by adopting the prior six-phase seven-leg inverter topological structure to control a six-phase permanent magnet synchronous motor, and the short of one switching element probably cause the unable run of the motor. The six-phase nine-leg inverter with the high fault-tolerant ability, disclosed by the invention, comprises a six-phase half-leg topological structure, two phases with mutual deviation of a mechanical angle of 90 degrees in a six-phase motor serve as one group, every two phase windings are additionally provided with one leg, and the added three legs respectively control the current zero-sequence component of one two-phase winding; the added three legs control the current zero-sequence component of phase windings together, A, B, C, D ,E and F phase subcircuits and subcircuits where the added three legs are arranged need to be connected with two-way breakover diodes in series, and when the switching element has short troubles, relevant two-way breakover diodes are turned off to achieve fault isolation.

Description

technical field [0001] The invention relates to a six-phase nine-arm inverter with high fault tolerance, belonging to the field of motor control. Background technique [0002] The six-phase permanent magnet synchronous motor has fault-tolerant operation capability due to the redundancy of the number of phases, and is suitable for applications that require high reliability of drive motors such as multi-electric aircraft, pure electric vehicles, and electric propulsion ships. Using a six-phase half-bridge (as attached figure 1 (shown) drives the six-phase permanent magnet synchronous motor, when the open circuit of the winding or the open circuit of the switching device occurs, the remaining winding current sum still needs to be kept at zero, that is, the zero-sequence component of the current is uncontrollable, and the maximum output capacity of the motor cannot be exerted. There is a bottleneck in control. And when adopting cascaded / full bridge inverter structure (as attac...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that there is a great risk in controlling a six-phase permanent magnet synchronous motor by using the existing six-phase seven-arm inverter topology, and the motor may not be able to run due to a short circuit of a switching device. A six-phase nine-leg inverter with high fault tolerance

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