| Title |
An Adaptive Current Control Scheme of an AC Servo Motor for Performance Improvement of a Servo Drive |
| Keywords |
MRAC ; AC servo drive ; PMSM ; DSP ; Adaptive current control ; Parameter variation |
| Abstract |
An MRAC-based adaptive current control scheme of an AC servo motor is presented for the performance improvement of a servo drive. Although the predictive current control is known to give ideal transient and steady-state responses, its steady-state response may be degraded under motor parameter variations. To overcome such a limitation, the disturbances caused by the parameter variations will be estimated by using an MRAC technique and compensated by a feedforward control. The proposed scheme does not require the measurement of the phase voltage unlike the conventional disturbance estimation scheme using observer. The asymptotic stability is proved. The proposed scheme is implemented using DSP TMS320C31 and the effectiveness is verified through the comparative simulations and experiments. |