초록 ▼

A permanent magnet synchronous motor having multiple-phase armature windings and a rotor is subjected to sensor-less control. Phase voltages are generated in response to voltage command values. The generated phase voltages are applied to the armature windings. Phase currents through the armature win

A permanent magnet synchronous motor having multiple-phase armature windings and a rotor is subjected to sensor-less control. Phase voltages are generated in response to voltage command values. The generated phase voltages are applied to the armature windings. Phase currents through the armature windings are detected. The detected phase currents depend on the voltage command values. An angular position and an angular velocity of the rotor are calculated from the detected phase currents. The voltage command values are adjusted in response to the calculated angular position and the calculated angular velocity of the rotor to implement feedback control of the motor. An angular velocity of the rotor is estimated from a time-domain variation in the calculated angular position of the rotor. A determination is made as to whether or not the calculated angular velocity of the rotor and the estimated angular velocity of the rotor are substantially equal to each other. The calculated angular position of the rotor is changed by a predetermined phase value and is thereby corrected when it is determined that the calculated angular velocity of the rotor and the estimated angular velocity of the rotor are not substantially equal to each other.

대표청구항 ▼

[ What is claimed is:] [1.] A method of position sensor-less control of a permanent magnet synchronous motor having multiple-phase armature windings and a rotor, the method comprising the steps of:generating voltage command values;generating phase voltages in response to the generated voltage comman

[ What is claimed is:] [1.] A method of position sensor-less control of a permanent magnet synchronous motor having multiple-phase armature windings and a rotor, the method comprising the steps of:generating voltage command values;generating phase voltages in response to the generated voltage command values;applying the generated phase voltages to the armature windings;detecting phase currents through the armature windings, the detected phase currents depending on the voltage command values;calculating the angular position and an angular velocity of the rotor on the basis of the detected phase currents;adjusting the voltage command values in response to the calculated angular position and the calculated angular velocity of the rotor to implement feedback control of the motor;estimating an angular velocity of the rotor from a variation with respect to the lapse of time of the calculated angular position of the rotor;determining whether or not the calculated angular velocity of the rotor and the estimated angular velocity of the rotor are substantially equal to each other; andchanging the calculated angular position of the rotor by a predetermined phase value to correct the calculated angular position of the rotor when it is determined that the calculated angular velocity of the rotor and the estimated angular velocity of the rotor are not substantially equal to each other.