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Switched reluctance and permanent magnet brushless motors in highly dynamic situations: a comparison in the context of electric brakes

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5 Author(s)
Omekanda, A.M. ; Delphi Adv. Powertrain Syst., Auburn Hills, MI ; Lequesne, B. ; Klode, H. ; Gopalakrishnan, S.
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Electromechanical brake (EMB) systems offer the potential for enhanced vehicle control while simplifying the car assembly as well as recycling process. This article offers a comparison of two motor technologies, switched reluctance (SR) and permanent magnet (PM) brushless, motor in highly dynamic situations, in all four quadrants of their torque-speed operating regions, for an EMB application and also describes the motor designs and their static characteristics, before examining in depth their dynamic behavior, in particular special control adaptations to enable the SR motor to reverse rapidly when needed. A 20% longer SR motor provided overall similar dynamic performance, but only if the SR motor is fitted with a speed limit. A method to choose such a speed limit was developed, and the software algorithm implementation was found to be simple and successful.

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Industry Applications Magazine, IEEE  (Volume:15 ,  Issue: 4 )