Servo drive system and continuous working system of press machine
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United States of America Patent
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Jan 5, 2010
Grant Date -
Mar 12, 2009
app pub date -
Nov 14, 2008
filing date -
Jun 18, 2002
priority date (Note) -
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Abstract
A servo drive system of a press machine includes a ram, an operation shaft which vertically moves the ram, and a servo motor which operates as a power source of the ram and which generates ram pressure using a torque based on at least one speed-torque characteristic of the servo motor. The operation shaft is directly driven using the servo motor. The at least one speed-torque characteristic of the servo motor is set in a manner such that a motor torque of the servo motor at which a capacity of electric energy supplied by a servo amplifier is determined becomes the motor torque at which an optimal punching pattern of the ram is generated from a light load to a heavy load according to a type of workpiece to be worked by the press machine.
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