Abstract
Results of numerical and experimental investigations of a novel inertial piezoelectric rotary type motor based on a low profile stator with trapezoidal waveguides. The proposed motor has a simple design and is well scalable. Moreover, the proposed design of the motor allows mount it on a printed circuit board and use it in a small-size mobile positioning and actuating systems. The structure of the stator is based on a square type hollowed steel frame with four straight trapezoidal waveguides that are used to transfer vibrations of the stator to the rotation of the rotor. Piezo ceramic plates are glued on both sides of the stator. The thickness of the assembled stator is 0.9 mm, while the total area needed for stator mounting does not exceed 625 mm2. The driving of the rotor is based on the stick-slip principle, which is induced by excitation of the second in-plane bending mode of the four bimorph plates applying two saw tooth waveform signals with a phase difference by π. The numerical and experimental investigation was carried out to validate the operation principle of the motor and to measure the mechanical and electrical characteristics. The maximum angular rotation speed of 1304 RPM was achieved at a resonance frequency of 44.81 kHz when a preload of a 7.35mN was applied.
Highlights
Inertial piezoelectric motors are widely used in modern mechatronic systems such as precise positioning devices, micro or nano handling systems, optical beam steering systems, zoom, focusing and image stabilization, scanning tunneling microscopy, etc. [1, 2]
Widespread use of inertial piezoelectric motors is due to the following advantages: short response time, high resolution, self–locking, magnetic field-free operation, etc. [3, 4]
The inertial piezoelectric motors are classified into two groups based on operation principle i.e., stick-slip and slip–slip [5, 6]
Summary
Inertial piezoelectric motors are widely used in modern mechatronic systems such as precise positioning devices, micro or nano handling systems, optical beam steering systems, zoom, focusing and image stabilization, scanning tunneling microscopy, etc. [1, 2]. The inertial piezoelectric motors are classified into two groups based on operation principle i.e., stick-slip and slip–slip [5, 6]. Linear inertial motors tend to have a simple design and provide limited displacement of the slider, while rotary type motors usually have a more complex structure and ability to provide high angular resolution and unlimited angular displacement range. Zhang and et al reported on the hybrid rotary motor based on slip-stick and inchworm operation principles [13]. The motor's design was based on a triangular driving mechanism that can propose benefits of both slip-stick and inchworm operation principles. The authors performed a numerical and experimental investigation and reported that the proposed motor is able to provide 4 N/m self – holding torque at 90 V and 2600 Hz under saw tooth excitation signal.
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