JPS61277384A - Motor for utilizing ultrasonic wave oscillation - Google Patents

Abstract

PURPOSE:To increase transmitting torque and enhance output, by organizing a plurality of stators/rotors to be put together. CONSTITUTION:Stators 100 are fixed to a case 11 with a stationary plate 10, and rotors 101 are fixed to a shaft 6 with stationary plates 9, and the shaft 6 is supported by bearings 7, and a motor device for utilizing ultrasonic wave oscillation is organized. The stators 100 are fixed by putting together a piezoelectrical unit 2a and an elastic unit 1 on one side face of a central elastic unit 3. The stators 100 are placed between the upper and lower rotors 101, and they are arranged in pressure contact with one another with a pressure spring 8. The rotors 101 are formed by lining sliding units 5 on supporting units 4. When to the electrodes A, B of the respective piezoelectric units 2a, 2b of the stators 100, the high-frequency voltage of the mutual phase shift at 90 deg. is applied, then advancing wave is generated on both surfaces of the elastic unit, and the rotors 101 and the shaft 6 are rotated in the given direction.

Description

[Detailed Description of the Invention] <Problems with the Prior Art> Five surface wave motors and ultrasonic motor devices that utilize ultrasonic vibrations (bending vibrations) of piezoelectric bodies have been disclosed by the applicant, but the conventional A rotary surface wave motor has a structure in which one stator and one rotor are stacked on top of each other.

(Objective of the present invention) However, by having a structure in which a plurality of stators/rotors of the present invention are stacked on top of each other, torque can be transmitted with a smaller pressing force than in the past, and the transmitted torque can be increased with the same pressing force. The purpose of the present invention is to provide a motor device that can achieve high output such as an increase in .

Basic Configuration of the Present Invention> Examples of the motor device of the present invention will be described below with reference to the drawings.

FIG. 1 shows a side view of a single motor. This figure shows a type in which one stator 100 is sandwiched between two rotors 101.

The stator ioo is fixed to the case 11 by the fixing plate 10,
The rotor lot is fixed to a shaft 6 by a fixing plate 9, and this shaft is supported by a bearing 7.

The stator 100 has a structure in which a piezoelectric body 2a and an elastic body 1 are stacked and fixed on one side of a central elastic body 3, and a piezoelectric body 2b and an elastic body 1 are stacked and fixed on the other side.

This stator is sandwiched between the rotor 101 from above and below, and pressed into contact with each other by a pressure spring 8. rotor lot
This is a structure in which a sliding body 5 is lined with a supporting body 4.

The piezoelectric body 2a of the stator is polarized, and the piezoelectric body 2b is also polarized, and the polarization arrangement of the piezoelectric body 2b is shifted by a wavelength from that of the piezoelectric body 2a (see FIG. 7).

When high-frequency voltages whose phases are shifted by 80 degrees from each other are applied to electrodes A and B of each piezoelectric body of each stator, a traveling wave, which is a combination of longitudinal waves and transverse waves, is generated on the surface of the elastic body 1 on both sides. The rotor and the shaft 6 having the fixed plate 9 rotate in a fixed direction.

In addition, in FIG. 4, one stator 104 is connected to two rotors 1.
01 is a side view of the sandwich type.

The stator 104 has a configuration in which a piezoelectric material 2a and a piezoelectric material 2b, each of which has been polarized, are fixed to both sides of an elastic body 17. When high-frequency voltages whose phases are shifted by 30 degrees from each other are applied to the electrode A of the piezoelectric body 2a and the electrode B of the piezoelectric body 2b, a traveling wave is generated at the pressure contact surface of the elastic body 17 with the rotor 101, and the rotation thereof is The child 101 and the shaft 6 having the fixed plate 9 are rotated in a fixed direction.

<About other embodiments of the present invention> FIG. 2 is a side view of a structure in which the unit shown in FIG. 1 is stacked, and in this figure, the stator 2
and two rotors are shown.

The central rotor 103 has a support 12 lined with sliding bodies 5 on both sides.

FIG. 3 is a side view of a type in which the rotor 103 is sandwiched between the stator 102.

When high frequency voltages having a phase shift of 80° are applied to the electrodes C and D of the polarized piezoelectric body 2G fixed to the elastic body 13 of the stator 102, a traveling wave is generated on the surface of the elastic body 13.

The generated surface traveling wave is transmitted to the rotor 103 in pressure contact with the pressure spring 14, and rotates the rotor and the shaft 6 having the fixed plate 9 in a fixed direction.

This figure shows six stators and three rotors.

FIG. 5 is a side view of a structure in which the configuration shown in FIG. 4 is used as a unit and a plurality of units are stacked on top of each other. In this figure, two stators and three rotors are shown. The figure shows a plan view of the polarized state of the piezoelectric body 2a.A high frequency voltage is applied to the electrode B on the surface of the piezoelectric body 2a. The H-plane electrode E is electrically connected to the elastic body side.

FIG. 7 shows a plan view of the polarized state of the piezoelectric body 2b, in which the polarization arrangement is shifted by λ/4 from the piezoelectric body 2a. The electrode A on the surface has a phase of 9 with respect to the high frequency voltage applied to the piezoelectric body 2a.
Apply a high frequency voltage shifted by 0'. The back electrode E is electrically connected to the elastic body side V.

FIG. 8 shows a plan view of the polarized state of the piezoelectric body 2C, and high frequency voltages with a phase shift of 90° are applied to the surface electrodes A and B. Further, the back electrode E is electrically connected to the elastic body (metal) side.

(About the effects of the present invention) As is clear from the above description, by having a structure in which a plurality of stators/rotors of the present invention are stacked on top of each other, torque can be transmitted with a smaller pressing force than in the past. This is an extremely useful invention as it can increase output by increasing transmission torque with the same pressing force.

[Brief explanation of drawings]

The drawings show the present invention: Fig. 1 is a side view of a type in which a stator is sandwiched between rotors, Fig. 2 is a side view of a structure in which a plurality of the types shown in Fig. 1 are overlapped, and Fig. 3 is a side view of a rotor. Figure 4 is a side view of the type in which the stator is sandwiched between the stators, Figure 5 is a side view of the type in which the stator is sandwiched between the rotors, Figure 5 is a side view of the structure in which multiple types of Figure 4 are overlapped, Figure 6 is FIG. 7 is a plan view showing the polarization state of the piezoelectric body 2a, FIG. 7 shows the polarization state of the piezoelectric body 2b, and FIG. 8 shows the polarization state of the piezoelectric body 2c.

Claims (1)

[Claims] A surface wave motor consists of a stator in which a polarized piezoelectric material is fixed to an elastic body and generates a surface traveling wave that is a combination of transverse waves and longitudinal waves, and a rotor in pressure contact with the stator. A motor device that uses ultrasonic vibration and is characterized by a structure in which a stator/rotor are stacked on top of each other.