The asymmetrical magnetic pole interior permanent magnet synchronous motors (PMSM) can effectively reduce the cogging torque and torque ripple without reducing the electromagnetic torque,widen the speed regulation range.At the same time,the motor structure is reliable and the manufacturing difficulty is low,which has a wide potential application prospect in the fields with high torque performance requirements.A new mathematical model of asymmetric magnetic pole PMSM was established in order to investigate the changes of the electromagnetic characteristics of the motor caused by the magnetic field deflection of the rotor,and the electromagnetic performance of the PMSM with different magnetic pole structures were analyzed by finite element analysis method.The simulation results show that the asymmetric magnetic pole structure can effectively reduce the torque ripple and cogging torque of the interior PMSM； the forward shift of the magnetic pole has a wider constant-power range under the maximum torque per ampere control strategy.Finally,the realization methods in practical engineering applications of the control strategy for the asymmetric magnetic pole PMSM were given.