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In permanent magnet machines, the primary cause of pulsation torque, which is the sum of the cogging torque and the pulsating components of magnet torque, is space harmonics contained in the magnetomotive force due to the armature current and in the air gap flux density due to the rotor permanent magnets. The pulsation torque causes vibration and acoustic noise and reduces the performance of the machine...
This paper propose a new current control system for IPMSM to reduce harmonic currents caused by the overmoduration and a non-sinusoidal magnetic flux distribution on the rotor. The harmonic currents have problems with making a current control system of IPMSMs unstable easily. The proposed current control system has two current controllers. One of them controls fundamental current to satisfy the required...
This paper presents a two-dimensional analytical calculation method for the eddy-current problem in the rotors of permanent magnet synchronous machines. The method takes into account the reaction field of the induced eddy-currents and is, therefore, not restricted to cases where the skin depth is large compared to the geometrical dimensions of the magnets and the rotor yoke. We apply the method to...
This paper deals with a method for determining the complex permeability in analysis of hysteresis motors. The method assumes that the magnetic intensity distribution is sinusoidal in the direction of rotation. Analysis of the asynchronous speed of a hysteresis motor is then performed for cylindrical coordinates, using modified Bessel functions. The results of calculations are in good agreement with...
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