JPS60200778A - Supersonic drive motor - Google Patents

Abstract

PURPOSE:To obtain a supersonic motor which has high durability, a small size and high efficiency by forming the drive surface of a stator of a material which has wear resistance and toughness, forming the driven surface of a rotor of a material which is softer than the previous material with high wear resistance, and contacting them. CONSTITUTION:A material 3 which has wear resistance and toughness such as iron or steel is mounted on an exciter 2 which has a vibrating component in the peripheral direction to form a stator 1, and mounted through a stator support 5 on a stator stationary base 6. A rotor 4 which is formed of a metal material having wear resistance as compared with the material 3 and low hardness is disposed oppositely to the drive surface 3a of the stator 1, and the driven surface 4a is contacted with the drive surface 3a of the stator. The material 3 can employ additionally quenched steel, tool steel, Duralumin, titanium alloy, etc., and the material of the rotor 4 can employ copper, copper alloy, aluminum, zinc, etc.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an ultrasonic drive motor that uses ultrasonic vibration as a driving source to cause resonance in an elastic body and converts the resonance motion into rotational motion to constitute a motor. It is related to.

Conventional structure and its problems Piezoelectric drive motors, so-called piezoelectric motors, which use piezoelectric vibration as an excitation part and cause resonance in a solid body, converting the vibration into rotational motion, have a simple structure. It is a major feature of electronic equipment.

It is expected to have a wide range of applications in cameras, medical equipment, etc.

However, since the piezoelectric drive motor converts ultrasonic vibration into rotational motion and uses it, wear of the two types of contacting media inevitably occurs at the part that converts the vibrational motion into rotational motion.

Several methods have been announced for motors that use ultrasonic vibrations, but the reason why they have not yet been put into practical use is because - problems such as wear related to feed between the stator section and the stator section have not been solved. This is because there is no

Purpose of the Invention The present invention provides a motor Q whose driving source is ultrasonic vibration, which has a small ultrasonic absorption coefficient of two contacting media, a large friction coefficient, is durable, compact, and highly efficient. The purpose of this invention is to realize an ultrasonic drive motor.

Structure of the Invention As a first aspect of the present invention, the driving surface of the stator section is made of a material that is wear-resistant and tough, and the driven surface of the rotor section is made of a material that is softer and wear-resistant than the above-mentioned material. It consists of Further, as a second invention, the rotor portion side is made of a material that has abrasive properties. As a result, a durable and highly efficient mortar can be realized.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention is shown in FIGS. 1 to 4. Basically, a piezoelectric drive motor consists of a stator section 1 and a rotor section 4. Stator part 1, piezoelectric body 2 serving as an excitation part, and iron or other material 3 to which the piezoelectric body is bonded.
It is more established.

Now, by dividing the piezoelectric body 2 into N electrodes and applying an electric field of - to the piezoelectric body 2 that is in contact with μ♂1, the stator part l (which has a ring-shaped structure) is created as shown in Fig. 4. ), the entire ring vibrates in a wavy manner, causing -1°
The rotor section 4 provided in the rotor section 4 is driven. 5 is a stay support part;
6 is a stator fixing base, and 7 is a shaft of the rotor section 4.

To explain the operating principle of this motor, each time a voltage is applied to the piezoelectric body 2 of the stator section 1, the drive surface 3 of the material 3, such as iron, is heated. Roll -1 9) Make J. This driving surface 3a has vibration components in the axial direction and the circumferential direction, and the driving surface 3a as a whole has vibration components in the axial direction and the circumferential direction.
Each part performs elliptical motion. At that time, "J-
When the driven surface 4a of the rotor section 4 is brought into contact with the rotor section 4, the rotor section 4 absorbs the axial component and rotates in one direction due to the circumferential component. I
By extracting the rotation of the curved portion 4 to the outside, a piezoelectric drive motor is realized.

The present invention has discovered that in such a drive motor, the combination of materials for the driving surface 3a and driven surface 4a of the stator section l and rotor section 4 is important. We have discovered that metals with toughness and toughness are important for the characteristics of motors. Specific material names include, for example, steel, hardened steel, tool steel, and other ferrous metals such as duralumin, titanium alloy, monel metal, phosphor bronze, helium 1, and juice 1. It has been found that tungsten, chromium, cobalt and their alloys are effective. The stator part 1 is a driving surface 3a
These materials 3 forming the Mr and the piezoelectric body 2 in contact therewith form a kind of resonator, and it is desirable that the so-called Q value of the resonance is as large as possible. In fact, the materials listed above are used at a normal motor operating frequency of 10 K II 2
~100K I-1y, the absorption coefficient of LJ ultrasonic waves is very small within my range, and I have 6 declarations that the Q of a high resonator is emitted.

- The +A deviation 1 of the rotor section 4 with respect to this force is the stator section 1
It has been found that a combination of metals that have more wear resistance and lower hardness than the metal used for this purpose is effective. Specifically, examples are shown in -4-, copper, and copper alloys.

We have found that aluminum, aluminum alloys, zinc, and zinc alloys are particularly effective. The reason for this is that the rotor section 4 takes out the circumferential component that contributes to the characteristic rotation of the stator section 1. To interfere with movement,
This is because vertical vibrations can be appropriately absorbed and only rotational components can be effectively extracted.

Furthermore, the material used for the rotor portion 4 may be a material that has the opposite property to the above-mentioned material, but has the property of being worn away by moderate abrasion, such as brass, glass, ceramics with a low degree of sintering, and alumina. , silicon car high 1
It has been found that -1 silicon dioxide and the like are effective. As these materials undergo repeated vertical vibrations, when the surface layer becomes fatigued, it falls off from the surface and a new surface layer is formed, and the new surface layer lJ1! ! This is because the friction coefficient can be obtained and the torque component having an fj effect can be extracted. This property is particularly important in terms of high torque and durability, and it has been found that NJL has this property.

Furthermore, by combining two types of +A materials as the driven surface 4a of the rotor portion 4, it is possible to obtain the same effect but also wear resistance and an effective friction coefficient of 12, or an effective friction coefficient due to a constantly fresh surface layer. did it. A combination of metal-nonmetal or nonmetal-nonmetal can be used as a composite material. FIGS. 5 and 6 show the structure of the rotor section 4 made of two types of materials. FIG. 5 shows a case in which the respective Moon O'4 materials are pulverized, mixed, and further integrated, and FIG. 6 shows a compounding process in which the respective +A materials are alternately combined in the circumferential direction. In Figure 6, 8a
8b is a material having wear resistance, and 8b is a material having a large coefficient of friction. The inventors have found that steel, helium copper, duralumin, etc. are effective as the material 8a with high friction coefficient, and copper, aluminum, zinc alloy, etc. are effective as the material 8b with a large friction coefficient. Yu et al. are effective, and the present inventors have developed a material with high friction resistance8.
It was confirmed that this configuration is effective by using (S 45 C) material as a and 1) 11 as material 8 with a large friction coefficient and b. As another configuration of the composite configuration, a concentric solid configuration as shown in FIG. 7 can also be considered. 9
A is a material having wear resistance, and 9b is a material having a high coefficient of friction.

Furthermore, the rotor portion 4 can be constructed of a non-metal material that has the same fragility as metal and has a large coefficient of friction. Examples of wear-resistant materials include glass fibers, carbon fibers, asbestos, epoxy, polycarbonate, and other engineering plastics used as structural materials. Further, as a material having a large coefficient of friction, rubber, synthetic rubber, silicone rubber, polyethylene, thermosetting resin such as phenolic resin, etc. can be used. Furthermore, metal-nonmetal Ml
, 7j can also be considered. The present inventors have developed a material that can be used as a wear-resistant material for metals.

It was confirmed that a composite rotor between non-metal and metal I was effective by using phenol resin, GOL, as the part with a large friction coefficient.

Further, as a composite structure of the rotor portion 4, Jr., 7. ,
FIG. 8 shows a composite configuration in the (back) direction. In FIG. 8, IOa is made of +W'-1 which has a resistance to 1r and has a large Iγ1 coefficient, and 10b is made of a structural material. The inventors used a mixture of phenolic resin and glass powder for 10a, and iron or brass for 1 and Ob, and confirmed that this structure was effective.

Figure 9 shows a continuous page (ij
Show characteristics. For comparison, the continuous load characteristics of a piezoelectric drive mower in which the rotor portion 4 is made of iron and the stake portion 1 is made of rubber are shown.

As described above, according to the ultrasonic drive motor of the present invention,
By optimizing the material of the contact 711 between the rotor section and the stator section, it is possible to realize an ultrasonic drive motor with large rotational torque (and durability).

[Brief explanation of drawings]

Fig. 1 is a perspective view of an ultrasonic drive motor according to an embodiment of the present invention, Fig. 2 is an Ivi side view thereof, Fig. 3 is a side view of the stator section, Fig. 4 is an explanatory diagram of its operation, and Fig. 5 8 to 8 are perspective views of various composite structures of the rotor portion, and FIG. 9 is a 1 to 1 hour characteristic diagram when composite materials are used. ■... Stake part, 3a... Drive surface, 4... Rotor part, 4a... Driven surface Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 figure

Claims (1)

[Scope of Claims] (1) A stator portion having an excitation portion having a vibration component in the circumferential direction and forming a drive surface having wear resistance and toughness, and a stator portion having a drive surface that is softer than the drive surface and has wear resistance. an ultrasonic driven V'' motor, comprising a rotor portion having a driven end in contact with the drive surface; (2) The driving surface is made of steel, hardened steel, tool steel, or a material equivalent to or higher than these, and the driven surface is made of copper,
The ultrasonic drive motor according to claim 1, wherein the ultrasonic drive motor is made of copper alloy, aluminum, aluminum alloy, zinc, zinc alloy, or an equivalent plate material. (3) The driving surface is made of a nonferrous metal alloy whose main component is a metal other than iron, such as duralumin 1-chikun alloy, monel metal, phosphor bronze, and helium copper. An ultrasonic drive motor according to claim 11, which is formed of tank stainless steel 1, koharu 1, or an alloy thereof. 1. An ultrasonic drive motor comprising: a stay portion having a driving surface having a hardness and toughness; and a rotor portion having a driven surface having abrasive properties in contact with the driving surface. (5) Claims in which the driven surface is made of aluminum, glass, ceramics with a low degree of sintering, alumina, silicon carbide, silicon dioxide, engineering plastic, or a material equivalent or superior to these materials. The ultrasonic drive motor according to item (4). (6) The following trends include silicon carbide, alumina,
The ultrasonic driven mold according to claim 4, wherein the i'M composite material is made of silicon dioxide or the like and a thermosetting resin such as a phenolic resin or an epoxy resin.