Combined Current Control Strategy for EV- HESM

Electrical Engineering

This paper presents a novel control strategy for Hybrid Excitation Synchronous Motor (HESM), In Which both armature and DC field windings are located in the stator. The resulting control strategy meets the desired characteristics of electric vehicle (EV) and hybrid electric vehicles (HEV) motors. A detailed mathematical model in both steady state and dynamic mode is provided for HESM. The deduced current control strategy based on a combination between field current control (If) and zero direct axis control (ZDAC). Flux regulation is done by keeping field current (If) constant near at its rated value for high acceleration Constant Torque (CT) region. For high speed Constant power region field current is reduced till zero at maximum speed. The conventional flux regulation strategy is done by reversing field current (If) to achieve an oppose flux that regulates the main motor flux. A comparison between the deduced flux regulation strategy and the conventional control strategy is held in steady state mode to show the effectiveness of the proposed strategy on the motor performance characteristics seeking for high acceleration and wide stable constant power speed range without over design. A dynamic Simulation comparison between using ZDAC in combination with the selected If reduced control strategy and without using it is carried out .The simulation dynamic results showed more stability, higher efficiency with using ZDAC in combination with If reduced control pattern.

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