Abstract :
A high-performance, fully operational four-quadrant control scheme for the interior permanent magnet (PM) synchronous machine is described. The machine operates smoothly with full performance in the constant-torque region as well as in the flux-weakening constant-power region in both directions of motion. The transition between the constant-torque region and the constant-power region is very smooth at all conditions of operation. Control in the constant-torque region is based on the vector stator flux, while constant-power region control is implemented through the feedforward vector rotator. The control system is digitally implemented using a distributed microcomputer system, and all of the essential feedback signals such as torque, flux, etc. are estimated with precision. A 70 hp drive system using a neodymium-iron-boron (NeFeB) PM machine and transistor pulse width modulation inverter was designed and extensively tested in the laboratory on a dynamometer, and performance was found to be excellent
Keywords :
electric drives; invertors; permanent magnets; synchronous machines; 70 hp; Ne-Fe-B; constant-torque region; feedforward vector rotator; flux-weakening constant-power region; four-quadrant control scheme; interior permanent magnet synchronous machine; transistor PWM invertor; vector stator flux; Control systems; Digital control; Feedback; Microcomputers; Permanent magnets; Pulse width modulation inverters; Stators; Synchronous machines; System testing; Torque control;
