• Document: Field Oriented Control of PMSM Using SVPWM Technique
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Global Journal of Advanced Engineering Technologies, Vol1, Issue2-2012 ISSN: 2277-6370 Field Oriented Control of PMSM Using SVPWM Technique E.PRASAD1 B.SURESH2, K.RAGHUVEER3 Abstract: The principle of space vector pulse ωr - rotor electrical speed width modulation (SVPWM) was introduced Vdc - DC Voltage and implementing for PMSM. Applying SA,SB,SC - Switching states SVPWM technique to the PMSM and 1. Introduction obtaining the speed, torque, current responses when load was increased. The Some different types of techniques used for mathematical model of PMSM is analyzed by speed control of PMSM as shown in the figure neglecting the saturation of the electric motor 1. Digital control techniques of AC motors, such ferrite core, turbulent flow and hysteresis loss as the space vector pulse width modulation in electric motor. Assuming that the current (SVPWM), have been developed with wide in the electric motor is symmetrical three range industrial applications. The SVPWM was phase sinusoidal current and the system brought forward in the 1980’s, specifically for model of FOC vector control has-been the frequency varying and speed regulation of established. The control system has been AC motors. It controls the motor based on the simulated by MATLAB/SIMULINK. switching of space voltage vectors, by which an Simulation results show that the model is approximate circular rotary magnetic field is effective, and the method provides a frame of obtained. In other words, the inverter is reference for software and hardware designs controlled to output an “appropriate” voltage waveform. This forms the basis of the magnetic Index Terms:-Modeling and simulation, flux linkage tracking pulse width modulation permanent magnet synchronous motor (PMSM), space vector pulse width modulation (SVPWM). The basis of SVPWM is different from that of sine pulse width modulation (SPWM). NOMENCLATURES SPWM aims to achieve symmetrical 3-phase sine voltage waveforms of adjustable voltage Ld - d-axis self inductance and frequency, while SVPWM takes the inverter Lq - q-axis self inductance and motor as a whole, using the eight id - d-axis current fundamental voltage vectors to realize variable Vd - d-axis voltage frequency of voltage and speed adjustment. If iq - q-axis current the voltage drop across stator resistance is Vq - q-axis voltage ignored, when the stator windings are supplied J - Inertia with perfect sine waveform voltages, a rotating B - Friction voltage space vector is formed with constant L - Self inductance magnitude and hence the air gap flux density Ψs - Stator flux linkage rotates with constant speed and circular track Ψf - Field flux linkage SVPWM is achieving by implementing the zero Τ - Output Torque voltage space vectors in the phase modulation hysteresis wave of sine pulse width modulation SPWM. Ф - Output flux hysteresis Sine pulse width modulation is easy for δ - Load angle hardware implementation but it is not easy for Va,Vb,Vc - Three Phase Voltage digital implementation. Low utilization ratio of Rs - Rotor resistance the voltage. Chances of short circuit at DC bus P - Pair of poles of the inverter. Te - Developed torque www.gjaet.com Page 39 Global Journal of Advanced Engineering Technologies, Vol1, Issue2 Issue2-2012 ISSN: 2277-6370 Scalar Baced Voltz/Hertz

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