Four-level power circuit of switched reluctance motor and using method

Abstract

The invention discloses a four-level power circuit of a switched reluctance motor and a using method. A multi-phase independent boost circuit part is added on the basis of a conventional asymmetric power conversion circuit. The four-level power circuit includes a common boost capacitor C2, switching tubes VTA1, VTB1 and VTC1, and diodes VDA1, VDB1, VDC1. By controlling the switching tubes to be switched on or switched off, each phase of winding of the switched reluctance motor is independently switched and runs in four states which are high-speed excitation (+2), quick demagnetization (-2), normal excitation (+1) and zero-pressure follow current (0), and the phases of windings do not interfere with each other. Each-phase four-level independent switching of the switched reluctance motor isachieved, and the four-level power circuit not only can perform normal voltage excitation on the windings, but also can perform high-speed excitation and quick demagnetization on the windings. The phase number of the power circuit is equal to the phase number of the motor windings, and the four-level power circuit is suitable for a motor with any phase number, has a compact structure with high robustness and high reliability and has huge application prospects.

Description

technical field [0001] The invention relates to the field of switched reluctance motors, in particular to a four-level power circuit applied to switched reluctance motors. Background technique [0002] The switched reluctance motor drive system (SRD) is composed of a switched reluctance motor (SRM), a power converter, a controller and a position detection device. It is a new type of electromechanical integrated AC speed control system. Its structure is as follows figure 1 As shown, among them, the power converter provides the energy required for the operation of the switched reluctance motor. [0003] The topology design of the SRM power conversion circuit (hereinafter referred to as the power circuit) is one of the keys to the design of the switched reluctance motor power converter. The topology of the power conversion circuit has a direct impact on the performance of the SRD system. A suitable power converter can reduce the switched reluctance. The cost of the motor is re...

AI Technical Summary

Problems solved by technology

[0012] In view of the above problems, the present invention proposes a new four-level power circuit for switched reluctance motors with independence in each phase. By controlling the on and off of the switching tubes in the power topology, the levels of each phase of the switched reluctance motor are at It can be switched independently at any time, solving the problem that the four-level power circuit cannot work effectively when the motor is running in overlapping

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