A torque improving stationary frame controller for permanent magnetsynchronous machines: Feedback linearizing decoupling control

摘要

Permanent magnet synchronous motors are often used in aself-commutated mode of operation. This may be accomplished through theuse of a resolver or other means of position feedback. In most cases,the phase angle of the applied voltage is configured to be 90° outof phase with the rotor permanent magnet flux (the optimal torque angle)for all operating conditions. However, the current flowing in the motorwindings will lag the applied voltage due to inductive and nonlineareffects. To resolve this problem, many manufacturers have developedcontrol circuitry which, in the past, has been rather complex. Thispaper describes an inexpensive, easily implementable, stationary frame,nonlinear control circuit applicable to permanent magnet synchronousmotors. This control was derived using rotating frame theory. Theproposed theory is supported by experimental results