Six-phase seven-bridge-arm series winding circuit topology with reverse winding and modulation method of six-phase seven-bridge-arm series winding circuit topology

Abstract

The invention discloses a six-phase seven-bridge-arm series winding circuit topology with a reverse winding and a modulation method of the six-phase seven-bridge-arm series winding circuit topology, and belongs to the field of alternating current motors and driving control. The voltage utilization rate is improved by changing the series connection sequence of the phase windings of the six-phase motor and reversely connecting part of the windings. Compared with a wiring mode of a six-phase seven-bridge-arm series winding circuit in which phase windings are sequentially connected in series and [delta]n is equal to 1, the six-phase seven-bridge-arm series winding circuit with the reversely-connected windings is high in direct-current voltage utilization rate and can be applied to application scenes where direct-current bus voltage is limited and the high direct-current voltage utilization rate is needed, such as electric automobiles, ship pushing systems and the like; and compared with a wiring mode of a six-phase eight-bridge-arm series winding circuit with phase windings sequentially connected in series and [delta]n=2, the six-phase seven-bridge-arm series winding circuit with the reversely-connected windings has the advantages that the direct-current voltage utilization rate is the same, the number of required bridge arms is small, the power density is higher, and the cost is lower.

Description

technical field [0001] The invention belongs to the field of AC motors and drive control, and more specifically relates to a six-phase seven-arm series winding circuit topology with reversed windings and a modulation method thereof. Background technique [0002] In recent years, due to the advantages of multi-phase motors such as small torque ripple, low power device capacity requirements, and strong fault tolerance, multi-phase motors and their control technologies have attracted more and more attention. In the research of multi-phase motor drive, the half-bridge topology is the basic topology of the traditional multi-phase inverter, but it has inherent shortcomings such as low degree of freedom in stator current control, narrow speed range, and poor fault tolerance; in addition, there is a Although the N-phase full-bridge inverter topology overcomes some of the shortcomings of the half-bridge topology, it also brings other disadvantages such as many power devices, high sys...

AI Technical Summary

Problems solved by technology

The first is the wiring method in which the phase windings are sequentially connected in series and Δn=1. The six-phase seven-leg series winding circuit used in this scheme is as follows: figure 2 As shown, the DC voltage utilization rate of this scheme is low, only 0.5

The second is the wiring method of the phase windings in series and Δn=2, the voltage utilization rate of this scheme is improved compared with the former times, but need to use two three-phase four-leg inverters to drive, combined into such image 3 In the six-phase eight-arm series winding circuit shown, the number of bridge arms required increases, which brings the disadvantages of low power density and high device cost

[0005] Therefore, in the prior art, it is difficult to achieve an optimal match in terms of voltage utilization, power density, and device cost in terms of voltage utilization, power density, and device cost.

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