Patent ID: 8342000

Claim:
A servo-press machine comprising: a slide; a servomotor for driving the slide for performing a press-forming operation; a power supply device configured to provide a driving power supply voltage; positive and negative power supply paths coupled to the power supply device; a capacitor connected between the positive and negative power supply paths; a motor rotation control section configured to control the servomotor based on slide motion information and the driving power supply voltage, the slide motion information including information for controlling the servo motor to drive the slide; a mechanism configured to convert a rotational motion of the servomotor into a linear motion to drive the slide; and a controller configured to obtain information regarding an induced voltage of the servomotor and the drive power supply voltage, determine whether the drive power supply voltage is lower than the induced voltage of the servomotor, and modify the slide motion information when the drive power supply voltage has been determined to be lower than the induced voltage.