Patent ID: 11888415
Assignee: PHYSIK INSTRUMENTE (PI) GMBH & CO. KG
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 19:
20. 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.