Electronic Pole-Changing Strategy with Cosine-Response for Multiphase Induction Motor Based on PR Controller

Abstract

The multiphase induction motor (MIM) suffers the problems of unsmoothness and slow dynamic response during the process of electronic pole-changing. To solve this issue, a cosine-response strategy based on proportional resonance (PR) current controller is proposed. Firstly, a current switching strategy with cosine-response is designed, which makes the MIM work more smoothly while switching between two planes. Then, the PR controller based on static coordinate system is adopted to replace the traditional proportional integral current loop controller, which realizes the zero steady-state error tracking of the current and improves MIM's dynamic response. Experiments on a five-phase induction motor verify that the proposed strategy can reduce the fluctuations of the torque, speed, and total harmonic distortion of phase current. Besides, it can improve the dynamic response of the torque and speed when the pole-changing is switched.

Bumpless Electronic Pole Changing for Variable-Pole Induction Machines

“…Figs. 13 shows a four-to six-pole transition. A transition duration of 200 ms is set to avoid exceeding the experimental inverter current rating.…”

“…By applying the derivative to (13) (21) This condition is decoupled into two components. g 1 captures the impact of flux change and g 2 captures the impact of current change on torque.…”

“…Once in a dq-reference frame, each pole configuration is controlled through a field-oriented speed control algorithm. The torque produced by each pole count is estimated using (13) based on the measured i qs and estimated flux linkage.…”