Minimisation of Ripples in Torque of Hysteresis Current Controlled PMSM using PI-RES Controller

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Abstract
This paper presents the minimization of ripples in torque of PMSM using proportional integral resonant controller. It is known PMSM is used wherever smooth torque is required. But because of some application of power electronics devices in the modelling often reveals the cogging torque that led to ripple in torque. The ripples in torque produces mechanical vibrations and noise in the machine that decreases the life of machine. The smoothness of torque is considered as the essential requirement for high performance of permanent magnet synchronous motors. For the better dynamic performance & minimum ripples in torque field oriented control(FOC) is implemented. The outer loop of FOC affect the performance of PMSM. PI controllers are generally preferred but this got affected by the variations in parameters, load condition and also on speed. To overcome this problem, resonant controller is introduced in accordance with PI for the minimization of ripples and to get the better performance. The performance of control methods of both PI & PI-RES controller is compared. The simulations are done in MATLAB/Simulink.

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