Control apparatus for synchronous motor

摘要

In a control apparatus for a synchronous motor, a coordinate converter converts a detected current into a current on rotational biaxial coordinates (d-q axis). A current controllers outputs a voltage command on the coordinates so that the current follows a current command on the coordinates. Another coordinate converters converts the voltage command into three-phase voltage commands. An adaptive observer calculates an angular frequency so that a q-axis component of an estimated rotor magnetic flux is zero. An inverter applies a voltage to the motor based on the voltage command.