| 摘要 |
An electrical machine apparatus includes an electromagnetic coil, a rotor magnet, n (n is an integer not less than 2) magnetic sensors to detect an electric angle of the rotor magnet, and a position detection part to detect a position of the rotor magnet by using outputs of the magnetic sensors. Each of the magnetic sensors generates a sensor output signal having a curved line waveform and a period of electric angle 2&pgr; of the electrical machine apparatus. The respective n magnetic sensors are arranged to generate the sensor output signals with a phase difference other than an integer times &pgr; in electric angle. The position detection part calculates a movement amount of the rotor magnet from a starting point as a position before movement by using the sensor output signals of the n magnetic sensors. |
