Servomotor control system enabling high-speed oscillating motion to be highly precise
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United States of America Patent
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Jan 17, 2012
Grant Date -
Jun 9, 2011
app pub date -
Sep 9, 2010
filing date -
Dec 9, 2009
priority date (Note) -
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Abstract
A servomotor control system that includes a numerical control unit and servo control unit enables the use of learning control based on an angle synchronization method in high-speed oscillating motion performed by, for example, a jig grinder. The numerical control unit calculates a reference angle θ(=ωt), and also calculates a cyclic oscillation command F(t) according to the reference angle θ and a machining condition (angular velocity ω). The servo control unit calculates a difference between the value in the oscillation command F(t) and the position of the servomotor (positional difference ε) at intervals of a predetermined cycle, and performs learning control according to the reference angle θ, oscillation command F(t), and positional difference ε.
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