| 摘要 |
<p>A method and an apparatus for determining the position of the rotor of a synchronous motor (1) used as an elevator motor, in which method an alternating current of a certain frequency is fed into the stator of the motor and the vibration of the machine is measured as a function of the rotor angle, and the position of the rotor (11) is determined by utilizing the said vibration.</p> |
