PRESS MACHINE, CONTROLLER AND CONTROL METHOD OF PRESS MACHINE

摘要

[PROBLEMS] To reduce motor power under wide operational conditions with an optimal control enabled even when a press operation speed or a press load energy changes. [MEANS FOR SOLVING PROBLEMS] The press machine comprises an angle detector (25) for detecting the rotation angle of a body of rotation (7), a device for determining a required motor torque dependent on the characteristics of the press machine based on the value of a rotation angle inputted from the angle detector, and a speed regulator for increasing the rotation command speed of a motor (1) over the above fixed command speed for such an rotation angle of the body of rotation that the required motor torque becomes smaller than a predetermined motor torque reference value. The press machine is further provided with a device (27) for correcting the amount of rotation command speed being increased by the speed regulator depending on variation in press operation speed or press load energy. The motor is rotary driven at such a rotation command speed as reflecting both the amount of rotation command speed being increased by the speed regulator and the amount being corrected by the correction device to correct the increased amount so as to reduce maximum power consumption of the motor.