Press machine and method of controlling the same

摘要

Provided is a press machine for driving a slide by a motor, including a control device for controlling driving of the motor, in which the press machine has a press capacity which can be variably controlled by using field control for the motor.

主权项

1. A press machine comprising:
a slide; a motor for driving the slide; and a processor configured to perform field control for the motor, the field control being performed by changing variably a command value for a d-axis current, wherein the processor is configured to perform a variable control of a press capacity of the press machine by variably changing the d-axis current in accordance with one of stroke pressure characteristics for positions of the slide in one stroke of its reciprocating motion, and the processor is configured to select one of the stroke pressure characteristics based on a trade-off between a position of the slide where a maximum pressure force is generated and a strokes per minute (SPM) at a time of generation of the maximum pressure force.