Alternating force based linear ultrasonic motor

A linear ultrasonic motor, alternating force technology, applied in the direction of generator/motor, piezoelectric effect/electrostrictive or magnetostrictive motor, electrical components, etc. and other problems, to achieve the effect of simple structure, small size and high speed

CN102025286AInactive Publication Date: 2011-04-20NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2011-04-20
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses an alternating force based linear ultrasonic motor which comprises a stator and a rotor, wherein the stator comprises a left Langevin vibrator and a right Langevin vibrator which are in butt joint along a central line, each Langevin vibrator is entirely of a continuous section rod type structure, the section of which is tapered from the tail part to the head part, the head parts of the left Langevin vibrator and the right Langevin vibrator are in butt joint to obtain a whole body, clamping members are arranged at the lower parts of the Langevin vibrators and installed among a group of piezoelectric ceramic wafers, two ends of the stator are respectively provided with a preload bolt, a driving foot piezoelectric ceramic wafer is attached to on a surface arranged at the butt joint position of the two Langevin vibrators and parallel to the vertical vibrating face of the vibrator, an electrode plate and a friction plate are attached to the driving foot piezoelectric ceramic wafer to form a driving foot, the rotor is a linear guide rail and parallel to the stator, and the rotor and the stator come into contact at the driving foot. The invention facilitates the improvement of the speed, the output force and the operating efficiency of a motor. The alternating force based linear ultrasonic motor has simple structure, small size, large output force, high speed and high efficiency.
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Description

technical field

[0001] The invention relates to a linear ultrasonic motor based on alternating force and its working mode and electric excitation mode, belonging to the technical field of ultrasonic motors. Background technique

[0002] Ultrasonic motor is a new type of power output device that utilizes the inverse piezoelectric effect of piezoelectric ceramics and ultrasonic vibration. Compared with electromagnetic motors, it has the advantages of compact structure, low-speed high-torque, fast response (milliseconds), power-off self-locking, good position and speed control, no electromagnetic interference, and low-noise operation. It is used in aerospace, micro Machinery, robots, precision instruments, servo mechanisms, medical devices and other fields have broad application prospects.

[0003] Linear ultrasonic motors belong to a category of ultrasonic motors. According to the structure of the stator of the linear ultrasonic motor is a plate and a rod (or a combined stru...

Examples

Embodiment Construction

[0018] A linear ultrasonic motor based on alternating force such as figure 1 As shown, it includes a stator and a mover. It is characterized in that: the stator is mainly composed of two left and right Langevin vibrators butted along the center line, and each Langevin vibrator is composed of a front cover 3, a rear end cover 2, a piezoelectric The ceramic sheet 6 and the corresponding electrode sheet 5 are composed of a continuous cross-section rod structure whose section is tapered from the tail to the head as a whole. A piece of piezoelectric ceramic sheet 4 for the driving foot is pasted on the surface parallel to the longitudinal vibration surface of the vibrator at the joint of the vibrator, and an electrode sheet 5 and a piece of friction sheet 8 are pasted on the piezoelectric ceramic sheet 4 for the driving foot to form the driving foot. The mover is A linear guide rail 1 is arranged in a parallel structure with the above-mentioned stator and contacts each other at the...