Piezoelectric stick-slip-motor and method of controlling same
AssigneePhysik Instrumente (Pi) GmbH & Co. KG
InventorsWilliam Culpi, Jerome Kneipp
Life of this patent
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Abstract
The present disclosure relates to a piezoelectric stick-slip-motor and control method. An exemplary method to enable speed variation of the piezoelectric stick-slip-motor with a reduced noise generation, includes: applying a cyclic sawtooth-waveform drive voltage signal with a constant frequency in which the drive voltage (V) increases to and decreases from a peak voltage (Vp) for operating the motor with a constant speed; and changing the motor speed by gradually increasing or decreasing the gradient (dV/dt) of increasing the drive voltage (V) to the peak voltage (Vp) with each subsequent sawtooth-waveform drive voltage signal cycle (C) while keeping the frequency of the drive voltage signal constant.
Claims20
A method of controlling a piezoelectric stick-slip motor, the method comprising:
- a. Step A:
- applying to the piezoelectric stick-slip motor a cyclic sawtooth-waveform drive voltage signal with a constant frequency in which a drive voltage (V) increases to and decreases from a peak voltage (Vp) for operating the piezoelectric stick-slip motor with a constant speed;
- and
- b. Step B:
- changing a piezoelectric stick-slip motor speed by gradually increasing or decreasing a gradient (dV/dt) of increasing the drive voltage (V) to the peak voltage (Vp) with each subsequent sawtooth-waveform drive voltage signal cycle (C) while keeping a frequency of the cyclic sawtooth-waveform drive voltage signal constant.
A piezoelectric stick-slip motor, comprising:
- an element to be driven;
- and
- a stator, said stator having a friction element, a controller and at least one piezoelectric actuator that is configured to deform upon application of a drive voltage signal from the controller so as to impart a movement to the friction element in order to drive the friction element to be driven by a stick-slip contact, wherein the controller is configured to perform computer-implemented functions of:
- a. Step A:
- applying to the piezoelectric stick-slip motor a cyclic sawtooth-waveform drive voltage signal with a constant frequency in which a drive voltage (V) increases to and decreases from a peak voltage (Vp) for operating the piezoelectric stick-slip motor with a constant speed;
- and
- b. Step B:
- changing a motor piezoelectric stick-slip speed by gradually increasing or decreasing a gradient (dV/dt) of increasing the drive voltage (V) to the peak voltage (Vp) with each subsequent sawtooth-waveform drive voltage signal cycle (C) while keeping a frequency of the cyclic sawtooth-waveform drive voltage signal constant.
Dependencies are inferred from the claim text.