Performance Improvement Of Interior Permanent Magnet Synchronous Motor

Abstract

newline Recent research has indicated that the permanent magnet synchronous motor (PMSM) newlineare more economically viable and become a main competitor due to availability of rare-earth newlinemagnets, such as neodymium iron boron at lower price. Also the advantages like fast dynamic newlineresponse, high efficiency, high torque and power density have allowed PMSM drive to newlinedominate over other ac drive used for different domestic and industrial applications which newlineneed precise speed control over a very wide range. The wide range of speed includes both newlineconstant torque and field weakening region. Between surface mounted permanent magnet newlinesynchronous motor (SMPMSM) and interior permanent magnet synchronous motor newline(IPMSM), IPMSM is widely used for operating the motor at above rated speed, because of newlinehigher degree of demagnetization effect. Still there exist some challenges to improve the newlineperformance of IPMSM drive system operating over wide range of speed. Therefore, different newlinecontrol strategy for inner current control loop of vector control based IPMSM drive are newlinediscussed and implemented to improve the performance of it over a wide range of speed is the newlineprime objective of this work. newlinePertaining to the entitled objective, a proper dynamic model of vector control based newlineIPMSM which permits to describe its performance are presented in rotor reference frame with newlinetwo control strategy (constant torque and field weakening control). A simple and robust field newlineweakening controller for vector control based IPMSM drive system is examined. Control newlinealgorithm of field weakening controller has been developed and implemented to run motor newlineabove base speed by producing necessary demagnetizing current according to optimum newlinerealization of physical limit. A Proportional Integral (PI) controller for outer speed control newlineloop of closed loop control of motor has been designed to run it in both constant torque and newlinefield weakening zones. newlineThe conventional sinusoidal pulse width modulation (SPWM) technique is chosen for newlineinner current control loop to evaluate the performance of motor at initial stage of research newlinework as it is very simple and easy to implement. The performance of the motor with SPWM newlinebased inner current controller and PI based outer speed controller is examined for both newlineconstant torque and field weakening region in MATLAB Simulink environment. newlinevii newlineAs an objective to improve the performance of the IPMSM further, three different newlinehysteresis controllers namely conventional hysteresis current controller (CHCC), modified newlinehysteresis current controller (MHCC) and adaptive hysteresis current controller (AHCC) are newlinepresented. To evaluate the performance of the motor, these three current controllers are newlinediscussed, mathematically analyzed and implemented along with PI controller in the outer newlinespeed control loop over a wide speed range. The feasibility of integrated control strategy for newlineIPMSM drive with CHCC, MHCC and AHCC is modeled and verified in the MATLAB newlineSimulink environment. An exhaustive comparative study is carried out with aforementioned newlinethree different hysteresis controllers to evaluate their performances in both steady state and newlinetransient state conditions. newlineFinally, the computational simulation obtained with CHCC and AHCC are validated newlineexperimentally through a hardware set up designed with DSP TMS320F2812 as it provides a newlinecomplete digital control system with high efficacy and fast computational proficiency