Six-phase eight-bridge arm inverter with high fault-tolerant capability

Abstract

The invention provides a six-phase eight-bridge arm inverter with high fault-tolerant capability, belongs to the field of the control of a motor, and aims at solving the problem that a motor can not run caused by the short circuit of one switching device as the topological structure of the existing six-phase seven-bridge inverter has a very large risk to control a six-phase permanent magnet synchronous motor. The six-phase eight-bridge inverter with the high fault-tolerant capability, provided by the invention, comprises a six-phase half-bridge topological structure, three phases in the six-phase motor are taken as one group, wherein the mutual-deviation mechanical angle of every two adjacent ones of the three phases is 120 degrees, one bridge arm is additionally arranged in every three phases of windings, and the two additionally arranged bridge arms respectively control a zero-sequence electric current component of one three-phase winding; and the two additionally arranged bridge arms jointly control a zero-sequence electric current component of the phase winding, A, B,C, D, E, F-phase branches and a branch in which the two additionally arranged bridge arms are placed are required to be connected with a bi-directional breakover diode in series, and a related bi-directional breakover diode is turned off when the switching device has a short-circuit fault, so that the fault isolation can be realized.

Description

technical field [0001] The invention relates to a six-phase eight-arm inverter with high fault tolerance and belongs 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 att...

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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 eight-leg inverter with high fault tolerance

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