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Abstract
The permanent magnet synchronous motor (PMSM) drives ha\'e been frequently used as servo drives in many industrial applications. This paper presents a Matlab/simulink model of PMSM drive using field oriented control. This control technique is an advanced technique for speed and current control. The supply is provided through a three phase inverter where the switching is done by space vector pulse width modulation (SIPIVM) technique. Compared to sinusoidal pulse width modulation SI PIVM technique is preferred due to its better dc link utilization and less harmonic distortions in the output current. The model of PMSM drive using SIPIVM is simulated and the results are analysed. Mathematical model of PMSM motor is done in d-q rotor reference frame.
keywords: Permanent magnet synchronous motor, field oriented control, space vector modulation, PI controller.
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I. Introduction
Permanent magnet synchronous motor drives are becoming more popular in industries and are replacing induction motor drives due to their high performances: high torque density, high efficiency and small size. PMSM have no windings in the rotor instead they have rotating permanent magnets made of neodymium-boron- iron , Alnico or samarium cobalt that retain their magnetic property. The magnets can be mounted on the surface of the rotor for medium speed operations or placed internally inside the rotor for high speed operations as in figure 1.
In this paper surface mounted PMSM has been considered for which the air gap flux density is maximum. The three phase stator windings of the motor are excited by three phase currents fed from a three phase voltage source inverter. The field oriented control (FOC) or vector control of PMSM drive helps to decouple the torque and flux producing components of stator currents and hence, controlling the motor becomes easier like a DC motor. The type of control offers fast response and less torque ripple.
Unlike an induction motor, the only current that can be controlled in a PMSM drive is the three phase stator current, since there is no rotor winding current. The electronic switches in the three phase inverter are turned on and off to control the direction of current through the stator windings. The inverter switching pattern is based on space vector pulse width modulation (SVPWM) which...