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Torque analysis and control of a double-layer interior permanent-magnet synchronous motor for electric vehicle propulsion applications

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3 Author(s)
Muntean, A. ; BRUSA Elektron. AG, Sennwald, Switzerland ; Radulescu, M.M. ; Miraoui, A.

In the first part of the paper, the electromagnetic torque of a double-layer interior permanent-magnet synchronous motor (DLIPMSM) for electric vehicle (EV) propulsion is analyzed using the finite-element field solution in the motor cross-section. Pulsating torque components are then evaluated, and a practical method to mitigate them by step-skewed PM-rotor design is applied in order to improve the electromagnetic torque quality. In the second part of the paper, the hysteresis-based direct torque and flux control (DTFC) scheme of DLIPMSM for EV propulsion applications is argued, and a novel approach for generating the reference stator flux-linkage vector magnitude is proposed to insure DLIPMSM extended torque-speed envelope with maximum torque-to-stator current ratio operation in the constant-torque region below the base speed, as well as constant-power flux-weakening operation with highest available torque in the region above the base speed. Experimental results for DLIPMSM steady-state characteristics and dynamic torque response under the new hysteresis-based DTFC over wide-speed operating range are provided and discussed.

Published in:

Advanced Electromechanical Motion Systems & Electric Drives Joint Symposium, 2009. ELECTROMOTION 2009. 8th International Symposium on

Date of Conference:

1-3 July 2009