Abstract:Cogging torque results from the interaction of the magnetmotive force(MMF) and the airgap permeance. The change of the cogging torque generates the vibration and noise and affects the stability of permanent magnet synchronous electrical spindle(PMSES).A method that weakens the cogging torque of PMSES was presented, and it can improve the precision of NC machine tool.The finite element model of PMSES was established and the electromagnetic characteristics of the PMSES was analyzed by ANSYS finite element analysis software.By changing different the longest length of airgap and offset angle of airgap profile parameters in the nonuniform airgap, the changer egular of cogging torque and rated torqueare were summarized.The cogging torque of the PMSES could be effectively reduced according to the optimal design parameter.The simulating results show that cogging torque firstly decrease and then began to increase with increase of the offset angle in the longest length of air gap.However, the rated torque firstly rises, then, gradually began to decline. The cogging torque can be effectively reduced and rated torque is not affected by reasonable design of airgap profile in the PMSES.
