28-01-2016, 11:39 AM
Surface mounted permanent magnet (SPM) motor with novel permanent magnet (PM) pole shape is presented, as to generate sinusoidal back EMF and reduce torque pulsations for linear electromagnetic torque.Square and sinusoidal current excitation is provided as to analyze the electromagnetic torque of SPM motor models.3-D finite element analysis (FEA) is utilized to analyze and compare the characteristics of SPM motor models.
Novel PM pole shaped SPM motor shows sinusoidal back EMF, linear electromagnetic torque with almost zero cogging torque.Proposed Model 2 and Model 3 show better characteristics than conventional Model 1, as it contains less PM volume, better electromagnetic torque and higher torque per rotor volume TRV.Sinusoidal current excitation gives better electromagnetic torque linearity as compare to square current excitation source. Torque ripples are highly reduced in proposed models, especially Model 3.