Closed Loop Speed Control of Permanent Magnet Synchronous Motor Drive using SVPWM Technique

Permanent magnet synchronous motors (PMSM), universally used as variable motor speed drives due to its special characteristics such as small volume, less weight, high efficiency, small inertia and hence high torque / inertia ratio, maintenance free, ease of control and high steady state torque density. This advantages creates possibility of replacing induction machines with PMSMs in industrial motor applications. The mathematical modelling of PMSM motor along with control strategy is presented which employs the SVPWM technique for generation of 2 level inverter output voltage. The Space Vector modulation approach is having advantages such as reduced harmonic contents and switching losses compared to conventional SPWM. The simulation results carried out for the reference speed and reference torque command signal, the output almost catches the input reference speed command. Due to requirement of the Voltage Source fed Inverter the PWM technique is employed as 2 level SVPWM strategy which is having maximum achievable peak fundamental phase voltage. A simulation model is developed in MATLAB / SIMULINK.