Abstract

This paper proposes a new concept for the Direct-Torque-Control (DTC)-based synchronous machine drive. DTC technology provides a synchronous machine drive with excellent dynamic properties. The DTC principles are first briefly recalled. The study observes the problem of the flux linkage integration instability and introduces the flux linkage estimate correction method based on the current model. The field winding current control methods are analysed. It is shown that a synchronous machine drive also needs a stabilisation method when working with very high load angles especially in the field weakening range. A method to control the load angle directly is then proposed. Test results with a 14.5-kVA laboratory prototype drive are given.

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