An asymmetrical current control system and method for an electrically excited doubly salient motor

Abstract

The invention discloses a double salient electro-magnetic motor asymmetric current control system and method. The system is provided with a novel power control circuit topology, each phase of a motor is controlled by an individual full bridge, the system comprises four power switch pipes, positive and negative amplitude values of phase current of the motor can be individually controlled, the system is provided with a closed-loop system of a rotating speed-asymmetric current ring, a rotating speed ring generates a reference current signal transmitted to a current amplitude value calculation module, an optimized positive and negative semi-cycle current reference value is obtained by the current amplitude value calculation module by the aid of an algorithm 'based on the maximum magnetic energy product principle', sampled current and the positive and negative semi-cycle current reference value given by a controller are compared to generate a control signal, and a control inverter bridge circuit controls the motor. The torque current ratio and the efficiency of the motor can be improved, torque pulsation is decreased, and control reliability is improved.

Description

technical field [0001] The invention relates to the technical field of electric excitation double salient pole motor control, in particular to an asymmetric current control method of electric excitation double salient pole motor. Background technique [0002] In 1955, Rauchhe Johnson first proposed the concept of double salient motor. However, limited by the low magnetic energy product of permanent magnet materials at that time, this type of motor had low power density and large volume and weight, so it could not be really applied in practice. In 1992, motor expert T.A. Lipo proposed the Doubly Slient Permanent-magent machine (DSPM) on the basis of the switched reluctance motor, and Nanjing University of Aeronautics and Astronautics proposed the electric excitation double salient motor (Wound -field Doubly Salient Machine, WFDSM). The doubly salient pole motor has a simple and sturdy structure, and has the advantages of high reliability, low cost, and high efficiency. It c...

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Problems solved by technology

[0004] At present, the control method of doubly salient motors is mainly angular displacement control, which can improve the torque of doubly salient motors at medium speed conditions, but the dynamic response of the motor is slow, the speed range is narrow, and the motor efficiency is low. The shortcomings of low and large torque ripple of the motor, etc., can not control the motor precisely

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