CN1327302A - Thin travelling wave supersonic motor - Google Patents

Abstract

The thin traveling wave supersonic motor has a stator comprising piezoelectric ceramic sheet adhered onto thin circular metal ring and a rotor comprising two semi-circular metal sheets inside the stator. The rotor contacts with the inner side of the stator via the spring installed inside the two semi-circular metal sheets. Inside the stator ring and in the circumferential direction, there are gullets. The supersonic motor has the advantages of simple structure, high thickness, good control performance, etc. and is especially suitable for the driving and control of thin industrial product.

Description

Thin Traveling Wave Ultrasonic Motor

Technical field

The invention relates to an ultrasonic motor utilizing piezoelectric effect and ultrasonic vibration in the plane of the stator.

Background technique

The existing traveling wave ultrasonic motor has a complex structure and is difficult to make very thin, therefore, it cannot be suitable for driving and controlling thin chemical industry products.

Invention content

A thin type traveling wave ultrasonic motor with simple structure, thin thickness, low cost and good controllability. The rotor is placed in the stator ring, and is in contact with the inner surface of the stator ring with a certain preload through springs placed in two semicircular thin metal plates. There are tooth slots on the inside of the stator. Compared with the prior art, the thin traveling wave ultrasonic motor has the advantages of simple structure, thin thickness less than 10mm, low cost, good controllability, etc., and is especially suitable for driving and controlling thin chemical industry products.

 Description of drawings

Figure 1. Schematic diagram of the structure of a thin traveling wave ultrasonic motor.

Figure 2. Schematic diagram of the tooth slots on the inner surface of the stator ring.

Figure 3. Schematic diagram of the divisional polarization form of the piezoelectric ceramic sheet and the input connection mode of the 2-phase voltage signal.

Figure 4. The (3,1) mode in the stator plane.

Label names in Figure 1: 1-thin metal ring, 2-piezoelectric ceramic sheet, 3, 4-half

Round sheet metal, 5-spring.

Detailed ways

As shown in Figure 1, the stator is formed by bonding a thin metal ring 1 and a piezoelectric ceramic 2, and the inner surface of the stator ring has evenly distributed tooth grooves, as shown in Figure 2. Its purpose is to increase the vibration amplitude of the stator, and at the same time make the grinding debris between the stator and the rotor can be discharged smoothly. The reason why the tooth grooves are opened on the inner side of the stator ring is that it does not use two standing waves (90° difference) out of the plane (perpendicular to the plane) to vibrate to form a traveling wave like the traditional traveling wave ultrasonic motor, but uses the plane Two standing waves (with a difference of 90°) to form a traveling wave. The rotor placed in the stator ring is composed of two semicircular thin metal plates 3 and 4 connected by a spring 5 placed in the middle. The spring provides the pre-pressure between the stator and the rotor, and the pre-pressure is adjusted by changing the degree of deformation of the spring.

Using the piezoelectric ceramic partition polarization form shown in Figure 3 and the input connection mode of the 2-phase voltage signal can ensure that the modes required by the stator are excited.

Figure 4 shows the (3, 1) bending modal standing wave in the stator plane. At this modal frequency, adding two-phase voltage signals with a phase difference of 90° on the stator can generate A traveling wave (rotational mode) is formed. As a result, the particles on the inner circumference of the stator produce an elliptical motion, which in turn causes the rotor to rotate.

The so-called (3,1) bending mode means that the circumferential deformation in the specified sub-plane has three waves, and the radial deformation has only one node.

Claims (2)

1, a kind of thin travelling wave supersonic motor, it is characterized in that, be adhesive on the thin metal annulus by piezoelectric ceramic piece and form stator, the rotor of two semicircle sheet metal compositions places in the track ring, and by placing two precompressions that spring produced in the semicircle sheet metal to contact with the track ring medial surface.

2, thin travelling wave supersonic motor according to claim 1 is characterized in that, the track ring medial surface along the circumferential direction has equally distributed teeth groove.

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