| 摘要 |
This rotation driving apparatus includes a torque generating circuit 72 for generating a torque of a servo motor 30 with voltage supply from a power source 71 and a motor control circuit 73 for controlling rotation of the motor. In the torque generating circuit 72 , a condenser 76 is arranged to detect a level of the supplied voltage and a period of voltage drop. A voltage-drop information detected by the condenser 76 can be transmitted to a host controller 70 . The host controller 70 previously memorizes a power-recovery information having a voltage drop and a time under an instantaneous blackout capable of recovering within a predetermined period and a rotation control pattern information of the motor corresponding to the power-recovery information and further compares the voltage-drop information, the power-recovery information and the rotation control pattern information of the motor with each other. Based on a control signal, the controller 70 controls the rotation of the servo motor 30 . Then, by controlling the rotation in correspondence with the voltage drop during the driving of the motor, it is carried out to suppress increasing of a driving period, improving the throughput and restricting vibration due to a rotational standstill of the motor by the voltage drop.
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