METHOD OF OBSERVER-BASED CONTROL OF PERMANENT-MAGNET SYNCHRONOUS MOTORS

摘要

2148466 9411945 PCTABScor01 A method of estimating and controlling rotor position and velocity for a multi-phase brushless permanent-magnet motor (12) by measuring only the stator phase 5 currents (24) at a high sampling rate. Measurements of the stator phase currents (24) are used to obtain estimates of rotor position and velocity. In turn, these estimates are used to determine an amount of voltage to apply to each stator phase so as to obtain a desired regulation of rotor position or velocity, or to command rotor position or velocity to follow a desired trajectory. Estimation and control of rotor position and velocity are implemented on the order of several times per millisecond by an approximate discretization technique. Furthermore, rotor position is observable at zero rotor speed.