Flux-region-variable design of a wide-speed-range permanent magnet motor with controllable flux leakage
Currently,permanent magnet motors have been widely employed in electric vehicles,but due to their limitations,such as narrow speed range and low efficiency in the flux-weakening region,improvement in the driving range and vehicle power performance of electric vehicles is still limited.To meet the requirements of electric vehicles in multiple operation conditions,developing high-quality drive motor systems with the advantages of high power density,wide speed range,and high efficiency has become one of the most widely studied topics in the field of automotive permanent magnet motors.To address this scientific problem,a flux-region-variable design methodology was established.By changing the armature current under different operation conditions,multiple variable magnetic reluctances and magnetic paths can be innovatively obtained in this region to effectively enhance the flux-regulation ability of the permanent magnet motor while changing the leakage flux and effective flux of the motor.Moreover,based on this new flux-region-variable design methodology,a type of wide-speed-range permanent magnet motor with controllable flux leakage was proposed.The general rule of the influence of the magnetic barriers and the corresponding variable reluctance path on the effective flux and the flux-regulation ability under different operation conditions was analyzed.The findings revealed that the proposed permanent magnet motor with controllable flux leakage has strong flux-regulation ability,high output torque,wide speed range,and wide efficient operating range.
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维普
