| 摘要 |
PROBLEM TO BE SOLVED: To allow for arbitrary design of frequency distribution characteristics in an overlapping high frequency selection range, while reducing electromagnetic noise.SOLUTION: A setting unit of a rotation sensorless controller sets any one overlapping high frequency out of a plurality of overlapping high frequencies, higher than the fundamental wave frequency in PWM control and different from each other, and also sets the duration of a voltage having the set overlapping high frequency or a current having the set overlapping high frequency at random. A generation unit generates a voltage or a current of the overlapping high frequency for the duration, and an estimation unit applies a voltage having the overlapping high frequency thus generated to a permanent magnet synchronous motor, or supplies a current having the overlapping high frequency thus generated to a permanent magnet synchronous motor, and estimates the rotor magnetic pole position and the rotational speed of the permanent magnet synchronous motor. |
