DEVICE AND METHOD FOR OPEN-LOOP OR CLOSED-LOOP CONTROL OF A MOVEMENT OF A DIE CUSHION OF A DIE CUSHION PRESS
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United States of America Patent
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Issued Date -
Aug 11, 2022
app pub date -
Jul 16, 2020
filing date -
Jul 17, 2019
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Abstract
In summary, the invention relates to a device and method for open-loop or closed-loop control of a movement of a die cushion of a die cushion press. The device has a control value encoder (11), a speed controller (12), a current controller (13), and a motor control device (14) for providing a nominal current for an electrical drive (15) of a fluid-hydraulic motor pump unit (20) for moving a die cushion of a die cushion press. The control value encoder (11) is provided in order to calculate a setpoint speed based on a die cushion control value command and a die cushion information. The speed controller (12) calculates a setpoint current based on the setpoint speed. The current controller (13) calculates a control signal based on the setpoint current, and the motor control device (14) calculates the nominal current based on the control current. In this respect, the dynamics of the control of the electrical machine can be improved.
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