| 摘要 |
PURPOSE:To shorten a time until a synchronization lead-in is completed at the start by stopping phase control means of a rotor by a control signal of a phase comparator at the starting time. CONSTITUTION:When a switch 18 is connected with a DC power source 17 side, a DC voltage E0 is applied through an amplifier 6 to a motor 1, which is started. When the rotating speed becomes the prescribed value or higher, the output of a rotating speed detector 10 becomes 'H', the switch 18 is connected to a phase compensator 5 side, and a reference signal generator 11 outputs a reference signal. A phase comparator 4 applies a phase difference of a rotating position detection signal from a rotating position detector 2 through the phase compensator 5 and the switch 18 to an amplifier 6. Thus, a time until a synchronization lead-in is completed at the starting time is shortened. |
