Mechanism analysis and suppression of cogging torque in parallel axis dual rotor permanent magnet motors for screw machines
In view of the electromagnetic problems such as excessive cogging moment and large torque pulsation of the parallel shaft dual-rotor permanent magnet motor,the traditional theory of single-slot cog-ging moment and the theory of fluctuation of side-end torque of the dual-rotor motor were analyzed,and the special components of the cogging moment of the parallel shaft dual-rotor motor as well as the harmon-ic orders of the torque of each part of the cogging moment were calculated. The effects of changing the pole eccentricity and rotor inclined pole on the cogging moment and torque characteristics of the motor were analyzed. The response surface method was used to construct a multi-objective optimization model of the motor,and the optimization variables of the motor were constrained by changing the permanent magnet eccentricity and the number of inclined pole blocks,and the optimal rotor structure parameters were solved through the constraint relationship as well as the optimization objectives. The finite element model was constructed to verify the correctness of the cogging moment theory. Comparing the electromagnetic performance of the motor under the optimal rotor structure parameters with that of the motor before optimi-zation,the electromagnetic performance of the motor after optimization,such as cogging moment and torque pulsation,is further improved,which verifies the validity of adopting the composite structure of pole eccentricity and rotor inclined pole.
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