Title :
Optimum current control for a high speed axial gap permanent magnet synchronous motor
Author :
Lai, J.S. ; Bailey, J.M. ; Young, R.W. ; Sohns, C.W. ; Hawsey, R.A.
Author_Institution :
Dept. of Electr. & Comput. Eng., Tennessee Univ., Knoxville, TN, USA
Abstract :
A high-speed (20000 r/min) axial-gap permanent magnet (PM) synchronous motor constructed and controlled using a novel algorithm is described. An optimization algorithm using the newton-Raphson method is proposed to solve the maximum torque/amp problem for salient-type PM motors. The optimum voltage and torque angle for different speeds are further derived from optimum dq-axes currents so that decoupled control can be applied to a six-step inverter. The complete drive system can be implemented using open-loop optimum voltage and torque angle trajectories or closed-loop control with one variable controlled by a lookup table and the other variable controlled by a closed-loop controller. The open-loop and closed-loop control systems are simulated. Although torque pulsation cannot be avoided with a six-step inverter, acceleration is quite smooth due to high load inertia.<>
Keywords :
electric current control; machine control; machine theory; optimal control; permanent magnet motors; synchronous motors; closed-loop control systems; current control; decoupled control; high speed axial gap permanent magnet synchronous motor; machine control; newton-Raphson method; open-loop control; optimal control; optimization algorithm; six-step inverter; torque angle; voltage; Control systems; Current control; Inverters; Newton method; Open loop systems; Optimization methods; Permanent magnets; Synchronous motors; Torque control; Voltage control;
Conference_Titel :
Industry Applications Society Annual Meeting, 1989., Conference Record of the 1989 IEEE
Conference_Location :
San Diego, CA, USA
DOI :
10.1109/IAS.1989.96734
