Patent ID: 6014007
Filing Date: 2000-01-11
Classification: H02P

Abstract:
A method for use with a field oriented controller (FOC) which separately regulates d-axis flux generating current and q-axis torque generating current, the method for starting an AC motor drive into a rotating motor, the method comprising the steps of:(a) determining an initial search frequency;(b) determining an initial d-axis flux generating search current;(c) providing the search current to the motor at the search frequency;(d) identifying an error indicative of a q-axis flux error;(e) comparing the error to a maximum error;(f) where the error is greater than the maximum error, modifying the search frequency and skipping back to step (c);(g) setting the instantaneous frequency to the instantaneous search frequency; and(h) facilitating normal drive operation wherein both d-axis flux generating current and q-axis torque generating current are provided to the motor at the instantaneous frequency.