Hybrid suspension type disc non-contact ultrasonic motor

Abstract

The invention provides a hybrid suspension type disc non-contact ultrasonic motor. The motor system is composed of a motor stator base body (1), piezoelectric ceramics (7), a motor rotor base body (2), a rotating shaft (5), a radial bearing stator (4), a radial bearing rotor (6), an axial bearing stator base body (10), an electromagnetic coil (11), a displacement sensor (12), an axial bearing rotor base body (13), a supporting seat (3), screws (8) and countersunk screws (9); radial passive stable suspension of a radial bearing is realized through the permanent magnetic circular rings and by means of permanent magnetic forces; the current of the electromagnetic coil is adjusted, so that permanent magnetic forces can be controlled, and therefore, the axial active stable suspension of an axial bearing is realized; and acoustic suspension and high-speed rotation of protestation of a motor stator can be realized under the driving effects of acoustic radiation pressure and an acoustic viscous force. The motor has the advantages of high speed, no mechanical friction, no need for lubrication, simple structure, easiness in stator and rotor clearance adjustment, and the like.

Description

technical field [0001] The invention relates to a hybrid suspension disc non-contact ultrasonic motor without mechanical rolling bearings in the field of micro motors. Background technique [0002] Ultrasonic motors have unique advantages such as simple structure and noiseless driving. The stator and the rotor of the ultrasonic motor are in contact with each other, the surface of the stator is excited by the piezoelectric element to form a motion, and the rotor is driven to rotate by friction. This type of ultrasonic motor relies on friction to convert electrical energy into mechanical energy, and the speed is limited. At the same time, the material requirements of the stator and rotor are high, and the friction loss reduces the service life. In order to overcome these shortcomings, non-contact ultrasonic motor has become a new research field. The rotor of the existing disc-type non-contact ultrasonic motor needs bearings to support the movement, and rolling bearings or ba...

AI Technical Summary

Problems solved by technology

The output torque of the non-contact ultrasonic motor is very small, and the friction torque of the mechanical bearing itself cannot be ignored in the non-contact ultrasonic motor. The form of mechanical bearing support for the non-contact ultrasonic motor is not suitable, and the output torque itself is very small. In the case of mechanical bearings, the output torque of the motor is weakened, which limits its further development. The problem of mechanical bearing support must be solved in order to increase the speed and torque of the motor.

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