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Modified Vector Control Algorithm for Increasing Partial-Load Efficiency of Fractional-Slot Concentrated-Winding Surface PM Machines

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4 Author(s)
Ayman M. EL-Refaie ; Electr. Machines & Drives Lab., Gen. Electr. Global Res. Center, Niskayuna, NY ; Thomas M. Jahns ; Patel B. Reddy ; John W. McKeever

This paper presents a modified vector control algorithm for a fractional-slot concentrated-winding surface permanent magnet (SPM) machine that has been developed to maximize the machine's partial-load efficiency over a wide range of operating conditions. By increasing the amplitude of the negative d-axis current, the resulting increase in the stator copper losses can be more than offset by the reduction in the iron core losses achieved by lowering the stator d -axis flux amplitude. The effectiveness of this technique has been demonstrated using both analytical models and finite element analysis for a 55-kW (peak) SPM machine design developed for a demanding set of traction drive performance requirements. For this example, the modified control strategy increases the partial-load efficiency at 20% of rated torque by > 6% at 2000 r/min compared to the maximum torque/ampere algorithm, making the machine much more attractive for its intended application.

Published in:

IEEE Transactions on Industry Applications  (Volume:44 ,  Issue: 5 )