Torque ripple minimization in permanent magnet synchronous motor

Abstract

ABSTRACT newlineAn original system is organized with a motor, a drive circuit, a specific speed newlinecontrol method, a control system with suitable controllers and a Pulse Width Modulation newline(PWM) strategy. The blatant performance metrics of any drive system is a high dynamic newlineresponse, increased efficiency, low acoustic noise, lesser torque ripple, optimal switching newlinefrequency, minimal Common Mode Voltage (CMV), wide range of speed control etc. newlineThe Field Oriented Control (FOC) or vector control is a very advanced and static linear newlinecontrol technique applied to poly phase motor drives. The advantages of Permanent newlineMagnet (PM) motors recently make them winsome candidates for direct drive newlineapplications, such as Hybrid Electrical Vehicles (HEV), washing machine, machine tools, newlinerobots etc. This is due to the high efficiency, the high torque to motor size ratio, the high newlinepower density, the lack of commutating brush (absence of excitation winding), the low newlinemoment of inertia and the low maintenance effort. newlineThe torque ripples or pulsations present in PMSMs are due to the newlinenon-sinusoidal flux density distribution in the air-gap, and need to be weeded. The newlinemagnet field, which is being established by the rotor PM, becomes variable due to the newlineinfluence of demagnetization effect, which results in a non-sinusoidal distribution of flux newlinedensity. Whilst, the rotor flux linkage can deviate in a wide range for the particular newlineoperating conditions such as saturation, temperature rises etc. In addition, torqu newline