Quasi-Static Force Measurement of Piezoelectric Materials

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Piezoelectric sensors and conditioning circuitry have the ability to generate electric charges in response to applied mechanical stress. Previously, piezoelectric sensors and circuitry have been utilized to measure rotor position and mitigate torque ripple, respectively. However, when piezoelectric sensors and circuits are applied in a feedback loop to control a permanent magnet synchronous machine (PMSM), the sensors and circuitry can drift due to the aging of components and temperature, reducing the accuracy of the system.

Purdue University researchers have developed a novel process of measuring charge using a piezoelectric sensor. Coupled with this novel process is an algorithm that is used to eliminate drift in the measured output of the circuit that is coupled to the piezoelectric sensor.

Advantages:
-Improved accuracy of a feedback-based motor control system

Potential Applications:
-Circuitry
-Electronics industry
Aug 16, 2011
DIV-Patent
United States
8,789,426
Jul 29, 2014

May 12, 2008
Utility Patent
United States
7,997,144
Aug 16, 2011

May 11, 2007
Provisional-Patent
United States
(None)
(None)
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