Bending single-phase driven rotary ultrasonic motor

Abstract

The invention is concerned with the ultrasound electric machine of the electrical micro-machine, especially the bending rotation ultrasound electric machine that is single-phase drive. It consists of: the six-sliced piezoelectric ceramic slice, the stator, the rotor and the pinch device. Each piezoelectric ceramic slice devices into two parts that are reversed phase polarization by the diameter as the axis of symmetry, one part expands and the other part reduce after giving the same voltage. The piezoelectric ceramic slice rotates 60 degree from top to bottom withershins. All the piezoelectric ceramic slices drive by the single-phase voltage with same phase. The body shape of the machine is pyramid shape.

Description

Technical field: [0001] The invention belongs to an ultrasonic motor in the field of micro-motors, in particular to a single-phase driven bending and rotating ultrasonic motor. Background technique: [0002] Ultrasonic motor is a new type of micro motor using the inverse piezoelectric effect of piezoelectric ceramics and ultrasonic vibration. The principle of the ultrasonic linear motor is completely different from the traditional electromagnetic induction motor. It has high power density, simple and compact structure, small inertia, fast response, good control characteristics, low speed and large torque (or large thrust), self-locking when power is off, High position resolution, direct drive of load, high efficiency, no noise, anti-electromagnetic interference and no magnetic field itself have become a novel micro-special motor. It is not only a brand-new automatic control element, but also a brand-new transmission form. [0003] The literature "Zhu Hua, Zhao Chunsheng, D...

AI Technical Summary

Problems solved by technology

[0005] 1. The radial slip is large, resulting in large radial friction, so the efficiency is low

Although the measure of adding a circular table at the lower part of the rotor can partially reduce the radial friction, but it also reduces the driving torque at the same time

[0006] 2. Poor uniformity of rotational speed

[0007] 3. Due to the use of a two-phase power supply drive with a phase difference of 90 degrees, the power supply structure is complex and the cost is high

[0008] 4. At the same time, due to the different positions of the two groups of piezoelectric ceramics, the frequency is not completely degenerate, which seriously reduces the driving efficiency

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