| 摘要 |
PROBLEM TO BE SOLVED: To provide a motor the output characteristics of which can be stabilized by detecting the zero-cross timing of variation in the line current of any two phases reliably, thereby detecting the rotational position of a rotor reliably.SOLUTION: The motor includes a motor having a stator with teeth around which a polyphase coil is wound, and rotary driving a rotor by electrifying the coil, an inverter performing PWM control of a current for electrifying the coil, and a control unit for detecting the rotational position of the rotor by detecting the zero-cross timing of a line induction voltage on the basis of the zero-cross timing of a line current flowing between respective phases of the coil, and the zero-cross timing of variation of the line current, and controlling the rotational position of the rotor by a command voltage. The electrical angle from the zero-cross timing of a line induction voltage UV to the boundary of a detectable range A of the zero-cross timing is set to an electrical angle equal to or larger than the detection period of the zero-cross timing of a line induction voltage UV. |
