Title :
Online optimal flux-weakening control of permanent-magnet brushless AC drives
Author :
Zhu, Z.Q. ; Chen, Y.S. ; Howe, David
Author_Institution :
Dept. of Electron. & Electr. Eng., Sheffield Univ., UK
Abstract :
An enhanced online optimal control strategy, which maximizes the flux-weakening performance of a brushless AC motor, is described, and applied to motors having different rotor topologies: interior (radial or circumferential), inset, and surface-mounted magnet. It enables the maximum inherent power capability of a brushless AC motor to be achieved independent of any variation in its parameters, and facilitates maximum efficiency over the entire speed range. It also results in good transient dynamic performance, since it is coupled with feedforward vector control based on optimal current profiles.
Keywords :
AC motor drives; brushless machines; feedforward; machine vector control; magnetic flux; magnetic variables control; optimal control; permanent magnet motors; rotors; brushless AC motor; enhanced online optimal control strategy; feedforward vector control; flux-weakening performance maximisation; inset magnet; interior magnet; maximum efficiency; maximum inherent power capability; online optimal flux-weakening control; optimal current profiles; permanent-magnet brushless AC drives; rotor topologies; surface-mounted magnet; transient dynamic performance; AC motors; Couplings; Electric machines; Induction motors; Machine vector control; Magnetic flux; Optimal control; Rotors; Torque control; Traction motors;
Journal_Title :
Industry Applications, IEEE Transactions on
