Novel large-torque pizoelectric motor

Abstract

A new type of great-torque piezoelectric motor includes double layer piezoelectric sheet, rotary wedge ball holder, massblock, blade hub and driving shaft. The double layer piezoelectric sheet consists of two piezoelectric ceramic sheets in opposite direction and elastic metal sheet. The rotary wedge ball holder consists of ball, spring and wedge outer case. The advantages of the motor include high power output density owing to resonant strain driving of piezoelectric ceramic sheet, low cost and more high reliability owing to rotary homogenous double layer piezoelectric sheet structure instead of the limination structure, and smaller size and simple structure owing to voltage driving control with monofrequency input signal.

Description

technical field [0001] The invention relates to a motor. Background technique [0002] Compared with conventional electromagnetic and hydraulic motors, piezoelectric motors have significant advantages such as high power density, small size, good installation integration, fast response, low noise, no electromagnetic leakage and anti-electromagnetic interference. They are used in various highly flexible missiles And many military occasions such as anti-torpedo guidance, aircraft braking, and movable body surface control have been widely used. In the past two decades, the popular design of piezoelectric motors is the "worm-type" stacked design. In the design of this structure, the clamping of the drive shaft is realized through the "active" clamping of the drive shaft by the telescopic deformation of the piezoelectric element. Due to the small strain of piezoelectric ceramics, its clamping force is limited. In high-power (torque) piezoelectric motors or drivers, this direct cl...

AI Technical Summary

Problems solved by technology

Due to the small strain of piezoelectric ceramics, its clamping force is limited. In high-power (torque) piezoelectric motors or drivers, this direct clamping method has the following disadvantages: (1) a large number of piezoelectric ceramic sheets are required , the cost is high, and there is no price competitive advantage compared with conventional hydraulic and electromagnetic drive motors; (2) Due to the small strain displacement of the piezoelectric material, the tolerance requirements for the drive shaft are relatively high, resulting in high machining costs; (3) ) The clamping force depends on the vertical pressure on the drive shaft and the friction between the clamping element and the drive shaft, and friction and thermal expansion can easily cause abrasive wear on the contact surface; (4) Since the clamping is "active", Each clamping element requires an independent input signal voltage to control, which increases the additional volume of the control element and reduces the power density of the entire piezoelectric motor; (5) Poor fault tolerance and difficult to guarantee stability

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