Title :
Minimization of torque ripple in permanent magnet motors: a closed form solution
Author :
Hung, John Y. ; Ding, Zhi
Author_Institution :
Dept. of Electr. Eng., Auburn Univ., AL, USA
Abstract :
A closed-form solution for minimizing torque pulsations or ripple in three-phase permanent magnet motors by the appropriate weighting of input current harmonics is presented. First, an analysis of torque ripple is presented by using the complex exponential Fourier series. In addition, a method to design the optimal weighting of current harmonics is developed by using constrained optimization techniques. In contrast to iterative approaches, the proposed design method determines the current harmonic weights in closed form; the procedure is especially easy to perform. Steps in the design procedure are demonstrated by a numerical example. Application of the optimal current should reduce torque-induced motor vibration and noise, as well as improve accuracy in servo applications
Keywords :
control system synthesis; electric current control; machine control; optimal control; permanent magnet motors; torque control; accuracy; applications; closed form; complex exponential Fourier series; constrained optimization techniques; control system synthesis; current control; design; input current harmonics; machine control; minimisation; noise; optimal control; permanent magnet motors; three-phase; torque control; torque ripple; vibration; weighting; Closed-form solution; Constraint optimization; Design methodology; Design optimization; Fourier series; Iterative methods; Magnetic analysis; Permanent magnet motors; Servomotors; Torque;
Conference_Titel :
Industrial Electronics, Control, Instrumentation, and Automation, 1992. Power Electronics and Motion Control., Proceedings of the 1992 International Conference on
Conference_Location :
San Diego, CA
Print_ISBN :
0-7803-0582-5
DOI :
10.1109/IECON.1992.254563