Piezo-electricity ultrasound and electromagnet integration driven electric motor

Abstract

The invention discloses an integrated piezoelectric ultrasound and electromagnetic combination drive motor, mainly comprising a torsional vibration piezoelectric chip, a longitudinal vibration piezoelectric chip, a piezoelectric drive stator, a sleeve, an electromagnetic drive stator, a multiplex rotor, a pre-tightening spring, a fastening bolt, abrasion-proof material and an output shaft. The longitudinal vibration piezoelectric chip, the torsional vibration piezoelectric chip and the piezoelectric drive stator are sequentially installed on a circular thin-wall sleeve and connected by the abrasion-proof material and the multiplex rotor which is installed on the output shaft and offers pre-tightening force to compress the abrasion-proof material as well as the piezoelectric drive stator by the fastening bolt and the pre-tightening spring. The motor, on the structural basis of the traditional brushless dc torque motor, is embedded with a longitudinal and torsional combined piezoelectric drive, integrates the advantages of two drives almost without expanding the volume, and is characterized by both the high thrust, high reliability and long service life of electromagnetic drive and the high dynamic response (millisecond level), high control precision and passive self-locking of piezoelectric ultrasound drive.

Description

technical field [0001] The invention relates to a brushless DC torque motor, in particular to a motor integrated with piezoelectric ultrasonic and electromagnetic hybrid drive. Background technique [0002] Due to the structure of the winding, the traditional electromagnetic motor is difficult to achieve low speed and high torque, and the deceleration mainly uses large brake mechanisms such as brake pads, which have a slow response speed; if in order to obtain the characteristics of low speed and high torque required by the control system, often It is necessary to use a reduction transmission mechanism, which greatly increases the complexity and weight of the mechanical parts, and the recoil effect of the reduction gear on the drive system, the amplification effect on the feed amount, and the flexible influence on the drive control are also inevitable, which seriously hinders the control The speed and accuracy of the system are improved. [0003] Ultrasonic Motor (USM for s...

AI Technical Summary

Problems solved by technology

However, since the output torque and speed characteristics of the ultrasonic motor are related to the excitation frequency, voltage, phase, and external load, it has a large nonlinearity, and it has not been possible to establish an accurate mathematical control model so far. Therefore, on the premise of ensuring a certain output torque It is very difficult to adjust the speed down, and the range of speed adjustment is also small; the low reliability and life also limit its application range and development

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