Pedal actuator with nonlinear sensor

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United States of America Patent

PATENT NO 8686275
SERIAL NO

12008896

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Abstract

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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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Patent Owner(s)

  • STEINWAY, INC.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Stahnke, Wayne Lee Reno, US 3 14

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