Design methodology for torque-angle control of a non-linear vector controlled permanent magnet synchronous motor

摘要

Synchronous motor drives are emerging as an attractive alternative to DC and Induction Motor drives, especially in high power, low speed range. Different types of control schemes have been suggested for variable speed AC drives fed from static power converters. Among them direct and indirect vector control strategies have become quite popular in recent years. When applied the above scheme to synchronous motor drives, there are certain drawbacks like instability or abrupt stopping due to some constraints. In this work, to overcome the above drawbacks, a generalized design strategy is suggested for speed control loop of an inverter fed Permanent Magnet Synchronous Motor (PMSM) drive; in which its inherent flexibility to generate the same torque for different combinations of currents is exploited. The closed loop system for an inverter fed PMSM drive is simulated using MATLAB/SIMULINK. The performance figures of torque angle control as well as field oriented control can be obtained and verified through simulation for different power factors of the motor ranging from lagging to leading through unity.