Title :
Identification and compensation of force ripple in linear permanent magnet motors
Author :
Röhrig, Christof ; Jochheim, Andreas
Author_Institution :
Dept. of Electr. Eng., Univ. of Hagen, Germany
Abstract :
The main problem in improving the tracking performance of linear permanent magnet motors is the presence of force ripple caused by the irregular magnetic field of the permanent magnets and inaccuracy in electronic commutation by the servo amplifier. The paper presents a method to identify and compensate the effect of the force ripple in servo control. A physical model of the linear motor and the force ripple is derived first. The identification of the model parameters is done in a closed position control loop by measurement of the control signal for movements with different load forces. No additional sensors are necessary. A comparison of the tracking performance with and without ripple compensation is given
Keywords :
closed loop systems; compensation; friction; identification; linear motors; machine control; permanent magnet motors; position control; servomechanisms; closed position control loop; compensation; electronic commutation; force ripple; identification; irregular magnetic field; linear permanent magnet motors; servo amplifier; servo control; tracking performance; Commutation; Force measurement; Force sensors; Magnetic fields; Permanent magnet motors; Position control; Position measurement; Servomechanisms; Servomotors; Servosystems;
Conference_Titel :
American Control Conference, 2001. Proceedings of the 2001
Conference_Location :
Arlington, VA
Print_ISBN :
0-7803-6495-3
DOI :
10.1109/ACC.2001.946068
