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Application of permanent-magnet reluctance to minimise torque pulsation in single-phase synchronous motors

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1 Author(s)
Strahan, R.J. ; Dept. of Electr. & Comput. Eng., Univ. of Canterbury, Christchurch, New Zealand

A theory of applying permanent-magnet reluctance torque to suppress pulsating torque in single-phase synchronous motors is described. Solution sets exist for eliminating pulsating torque at all nominal loads which are equal to, or less than, the amplitude of the reluctance torque. A self-starting experimental motor having closed slots is described, and is shown to implement this theory effectively. Load testing shows that torque pulsation reduces to a minimum as the load moves to the nominal value. Application of these constant-torque solution sets to this closed-slot topology is described, showing characteristics. Selected solutions allow a sufficiently high ratio of pullout to nominal power for operation from the AC mains. Applications, and means for starting and controlling the closed-slot motor, and other topologies are described.

Published in:

Electric Power Applications, IEE Proceedings -  (Volume:152 ,  Issue: 5 )