Electro-magnetic closed-loop speed control for air-turbine spindles
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United States of America Patent
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Aug 2, 2011
Grant Date -
Apr 24, 2008
app pub date -
Oct 23, 2006
filing date -
Oct 23, 2006
priority date (Note) -
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Abstract
A method an apparatus for providing speed control in a spindle system are provided. The apparatus includes an air turbine spindle that rotates at a speed, an electromagnetic device coupled to the spindle for creating a torque to maintain a desired speed of the spindle, and a tachometer for generating a measurement of the rotational speed of the spindle. The electromagnetic device applies a torque to the spindle in response to the measurement to change the speed of the spindle to the desired speed.
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