To provide a speed sensorless control method of an AC motor along with its device, capable of matching an estimated speed value or estimated magnetic flux value of an all-dimension magnetic flax speed observer with an actrual AC motor.
The control device of an AC motor comprises a vector control calculation circuit 7 that outputs an output voltage command by vector control/calculation from an excitation current command calculated with an excitation current command calculating circuit 5, a torque current command calculated with a torque current command calculating circuit 6, a current detection value which is coordinate-transformed with a coordinate transformation circuit 4, an estimated speed value, and an estimated magnetic flux phase value. It also comprises a switching pattern generating circuit 8 for generating signals for PWM driving a power converter 1 on the output voltage command, and an all-dimension magnetic flux speed observer 9 that estimates the estimated speed value and the estimated magnetic flux phase value from the output voltage command and the current detection value having been coordinate-transformed. A coefficient correction circuit 10 is provided to correct the coefficients of a matrix used in the all-dimension magnetic flux speed observer 9, according to the magnetic flux command.
YAMAMOTO YOICHI
NAKAMURA SHIGEKAZU
| JPH11341898A | 1999-12-10 | |||
| JPH08322300A | 1996-12-03 | |||
| JP2003018898A | 2003-01-17 | |||
| JP2002335700A | 2002-11-22 | |||
| JPH11308900A | 1999-11-05 |
Kazuto Ishida
Mikio Hotta