Title :
High-bandwidth current control for torque-ripple compensation in PM synchronous machines
Author :
Springob, Lothar ; Holtz, Joachim
Author_Institution :
Vectron Elektronik GmbH, Krefeld, Germany
fDate :
10/1/1998 12:00:00 AM
Abstract :
Active compensation of torque harmonics in high-performance synchronous permanent magnet (PM) motor drives requires high-bandwidth current control. It is demonstrated that proportional integral (PI) current control exhibits performance limits, even when feedforward compensation of the rotor induced voltage and the stator inductance drop is used. High bandwidth requirements are satisfied using a digital deadbeat current controller. Sampling time delays are eliminated to the extent possible by means of a current predictor. The current controller and the predictor refer to a model of the parasitic effects of the PM synchronous machine that is acquired and adapted to parameter changes in real time. Stator current distortions due to deviations from the sinusoidal flux linkage distribution are thus eliminated. The control system facilitates compensation of high-frequency torque ripple of the machine
Keywords :
compensation; electric current control; feedforward; harmonics; machine control; magnetic flux; permanent magnet motors; predictive control; rotors; stators; synchronous motor drives; torque; torque control; two-term control; PI current control; PM synchronous machines; current predictor; digital deadbeat current controller; feedforward compensation; high-bandwidth current control; high-frequency torque ripple compensation; parasitic effects; permanent magnet synchronous motor drives; proportional integral current control; rotor induced voltage; sampling time delays elimination; sinusoidal flux linkage distribution; stator current distortions; stator inductance drop; torque harmonics active compensation; torque-ripple compensation; Bandwidth; Current control; Delay effects; Digital control; Inductance; Motor drives; Predictive models; Rotors; Sampling methods; Stators;
Journal_Title :
Industrial Electronics, IEEE Transactions on
