A Multilevel Power Topology for Switched Reluctance Motor

Abstract

The invention discloses a multi-level power topology structure of a switch reluctance motor. A boost circuit part is additionally arranged between a traditional asymmetric power conversion circuit and a DC power supply and comprises a capacitor C1, a boost capacitor C2, a switching tube T1 and a diode D1, a switching tube T3, a diode D3 and a bidirectional switch, wherein the switching tube T1 and the diode D1are reversely connected in parallel, the switching tube T3 and the diode D3 are reversely connected in parallel, and the bidirectional switch comprises a switching tube T2 and diodes D21, D22, D23 and D24. By controlling the switch-on and the switch-off of the switching tubes in the power topology, the switch reluctance motor can run by switching among five states of rapid excitation (+2), rapid demagnetization (-2), normal excitation (+1), normal demagnetization (-1) and follow current (0). The rapid excitation and the rapid demagnetization of the switch reluctance motor are achieved, the problems of slow excitation current rise and reduction, low system efficiency, low dynamic performance and the like during motor running are solved, and the multi-level power topology structure has high robustness, high reliability and intelligence and has huge application prospect.

Description

technical field [0001] The invention relates to a power conversion circuit of a motor, in particular to a multi-level power topology structure of a switched reluctance motor. Background technique [0002] The switched reluctance motor has the advantages of high reliability, large starting torque, and low manufacturing cost. Its power topology has been a hot research topic for experts from various countries. A suitable topology can reduce the cost of the switched reluctance motor and improve the efficiency of the switched reluctance motor. The dynamic characteristics of the switch widen the application of the switched reluctance motor. On the basis of the most commonly used asymmetric half-bridge power conversion circuit, the four-level circuit proposed in the document "Instantaneous Torque Control of Switched Reluctance Motor Based on Four-level Power Conversion Circuit" cannot provide a normal demagnetization state; the document "Five-level The direct instantaneous torque ...

AI Technical Summary

Problems solved by technology

[0003] The problem to be solved by the present invention is to improve the deficiencies in the existing power circuits, and provide a new multi-level power topology structure of switched reluctance motors. The motor switches to run in a variety of different level modes to solve the problems of the motor's excitation current rising and falling slowly, and the system efficiency and dynamic performance being low during operation

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