| 摘要 |
PROBLEM TO BE SOLVED: To detect the absolute position of an electric motor within one rotation, by setting the number of rotor poles in a position detection rotor in a rotor pitch position detection means for detecting a relative position to a value that does not have a common divisior for the number of rotor magnet poles of the electric motor, and by performing a fixed processing based on both rotor positions. SOLUTION: When the coil winding of an electric motor is utilized for detecting a position, the change in a coil winding inductance and a rotor position Xmes 2 that is calculated based on the change are 6 periods within a machine angle of 360 deg. since the number of magnetic poles of the rotor is 6. On the other hand, in the case of a rotor pitch position detection means, the degree of magnetic coupling and a position detection value Xmes 1 that is calculated based on it are 7 periods in a machine angle of 360 deg. since the number of rotor poles is 7. In this manner, when the number of rotor poles of the rotor pitch position detection means for detecting a relative position is 7 for the number of magnetic poles of the electric motor of 6 and there us no common divisor a position in the machine angle of 360 deg. of the rotor can be determined based on the Xmes 1 and the Xmes 2. |
