Pedal actuator with nonlinear sensor
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United States of America Patent
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Apr 1, 2014
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N/A
app pub date -
Jan 15, 2008
filing date -
Jan 15, 2008
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Abstract
A piano is equipped with an actuator that moves the piano pedal mechanism in a manner that reproduces the pedaling effects of an original performance with high accuracy. The actuator comprises a solenoid, a permanent magnet, a velocity sense coil, and a Hall-effect sensor. The Hall-effect sensor provides an indication of the displacement of the solenoid plunger in accordance with an inverse-square law. Closed-loop feedback control is provided to effect a very true reproduction of pedaling effects. Automatic calibration allows for simple installation.
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