| 摘要 |
PURPOSE:To obtain a servo device of a motor having an excellent applicability by forecasting bias voltage for the motor to reach a desired speed from the result of periodic instrumentation of frequency signals according to the rotational speed of the motor and supplying the forecasted bias voltage to the motor. CONSTITUTION:In the case of servo-controlling of a motor, a speed of the motor 3 is accelerated by a speed servo-system through a comparison between the desired speed and a speed signal Fv until it reaches a specific value. When the speed of the motor 3 reaches a specific value, a periodic instrumentation circuit 5 counts one period of frequency signals f. A conversion table 15 reads out bias voltage in accordance with the difference between a measured period and a reference period, and supplies it to a subtraction circuit 1. Simultaneously, a switch 1 is turned on, and phase servo-system is started. According to the constitution, the time required for the motor to reach the desired speed can be shortened. |
