A discrete-time current controller for permanent magnet synchronous motor drives

Abstract

A discrete-time current controller is presented for the current loop of the permanent magnet synchronous motor drives. Firstly, the difference equations of current errors are obtained for constant reference values. Then, a dead-beat controller is designed to drive the dq-axes currents to the desired values. Discrete-time integral action with an anti-windup scheme is added to the dead-beat structure to achieve a better steadystate behaviour. In order to improve the transient properties of the controller, a current prediction scheme based on dead-beat structure is also introduced to the controller. Finally, the proposed controller is implemented through numerical simulations to illustrate the effectiveness for both transient and steady-state responses.

A switched current controller with commutation delay compensation for the reduction of commutation torque ripple in BLDCM drives

“…Hence, the values of the signals used in the controller have to be known before a necessary amount of time from k th time instance. In this manner, the dead-beat prediction scheme is utilized to approximate the signal values for the beginning of the next PWM period (see [18] for details). All the signals with measurement delay are predicted during the operation.…”