SENSORLESS CONTROL METHOD AND APPARATUS FOR A MOTOR DRIVE SYSTEM

摘要

A method and apparatus provide a state observer control system (600) for a motor (106) that uses an extended Kalman filter (330) to predict initial rotor position and afterwards accurately predict rotor position and/or speed under variable types of loading conditions. A control system model (300) is generated that allows variable setting of an initial rotor position to generate estimated rotor position and speed as outputs. The control system model (300) includes an EKF (extended Kalman filter) estimator (330), speed controller (322), a current controller (324), and a variable load component (310). During operation, EKF estimator (330) estimates rotor speed (327) and position (333) based on reference voltages (402, 404) and currents (1325) generated by speed and current controllers (322, 324) and input from frame transformers (326, 328). Additionally, the reference currents and voltages (402, 404, 1325) are frame­ transformed to be used as feedback signals (418, 346) in the system (600) and as drive signals to control power to be applied to a motor load (602).