JPS6173582A - Electrostrictive drive motor - Google Patents

Abstract

PURPOSE:To increase the lifetime and to improve the bondability of a motor by moving a common contactor obtained by coupling the movable ends of two electrostrictive elements along the surface of a rotor, thereby reducing the wear of a contactor and a rotor. CONSTITUTION:Two electrostrictive elements 1a, 1b are disposed at a perpendicular angle, and the movable elements of the elements 1a, 1b are coupled by a common contactor 2. AC voltages of substantially 90 deg. different phases are applied by an AC voltage source 4 and a phase unit 5 to the elements 1a, 1b, and the end of the contactor 1 is contacted once by the one revolution of a rotor 3 to rotatably drive the rotor 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electrostrictive drive motor that uses m-strain elements to extract mechanical rotational output.

[Conventional technology]

Conventionally, there has been a device of this type as shown in FIG.

FIG. 4 is a schematic configuration diagram showing a conventional electrostrictive drive motor. In the figure, (1) is an electrostrictive element, (2) is a contactor attached to the movable end of this electrostrictive element (1), and ( 3) is a rotor driven by this contactor (2), and (4) is an AC power source.

Next, the operation will be explained. When an AC voltage from an AC power supply (4) is applied to the electrostrictive element (1), the contactor (2) attached to the movable end of the element vibrates in the direction of the arrow (2) according to the input voltage. arise. Since the contactor (2) is installed closely on the surface of the rotor (3), the rotor (
3) Rotate in the direction of the arrow (gong).

[Problem that the invention seeks to solve]

In conventional electrostrictive drive motors such as those mentioned above, the direction of vibration of the contactor is such that it impacts the surface of the rotor, which causes wear and deformation of the contactor and rotor, resulting in a short lifespan. There was a problem. Furthermore, if an attempt is made to reduce the impact by setting the vibration direction of the contactor substantially parallel to the rotor surface, there is a problem in that the adhesion between the contactor and the rotor decreases.

The present invention was made to solve these problems, and provides an electrostrictive drive motor that has good adhesion between the contacts and the rotor and has a long life.

[Means for solving problems]

The electrostrictive drive motor according to the present invention includes two electrostrictive elements arranged at right angles, a phase shifter that shifts the phase of the reciprocating motion of these two electrostrictive elements by 90 degrees, and a movable motor for moving the two electrostrictive elements. It is provided with a common contactor obtained by connecting the ends, and when the electrostrictive element moves, the contactor and the rotor come into contact to rotate the rotor.

[Effect]

In this invention, the locus of movement of the contactor closely follows the surface of the rotor, reducing wear on the contactor and the rotor.

〔Example〕

FIG. 1 is a schematic configuration diagram showing an electrostrictive drive motor according to an embodiment of the present invention. In the figure, (la) and (1b) are two electrostrictive elements arranged at right angles, and (2) is the above-mentioned electrostrictive element. A common contact obtained by connecting the movable ends of two electrostrictive elements 0a) (1b), (5) is a common contactor obtained by connecting the movable ends of two electrostrictive elements (1a) (1b)
This is a phase shifter that shifts the phase of the reciprocating motion by 90°.

Next, the operation will be explained. Electrostrictive element (LA).

(1b) are applied with alternating current voltages with a phase difference of approximately 90°, their movable ends vibrate in the directions indicated by X and y, respectively, and the solid lines (6a) and (6b) in FIG.
) is transmitted to the contact (2). FIG. 8 is a detailed view of the contact portion between the contactor and the rotor to explain this movement. The movement of the contactor is a combination of the X and y movements shown in (6a) and (6b) in FIG. 2, resulting in a circular trajectory (8) in FIG. 8.

The tip of the contactor (2) contacts the rotor (3) once per revolution, thereby driving the rotor (3) in the direction of the arrow. The direction is parallel to the surface of the rotor (3), so there is little impact during driving.Moreover, the adhesion between the contactor (2) and the rotor (3) is maintained in a good state.

In the above embodiment, a case was explained in which a sinusoidal AC voltage was applied to the electrostrictive element, but by appropriately selecting this voltage waveform, the motion locus of the tip of the contactor (2) can be traced to the dotted line (9) in FIG. ), it is possible to approximate the curve of the surface of the rotor (3). At this time, the waveforms of the displacements of the two electrostrictive elements become as shown by dotted lines (7a) and (7b) in FIG. By performing K in this manner, the adhesion between the contactor and the rotor is further improved.

〔Effect of the invention〕

As explained above, this invention arranges two electrostrictive elements at right angles, shifts the phase of the reciprocating motion of these electrostrictive elements by 90 degrees, and connects the movable ends of the two electrostrictive elements. By moving the obtained common contact along the surface of the rotor, wear of the contact and the rotor is reduced, resulting in a long life and good adhesion.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing an electrostrictive drive motor according to an embodiment of the present invention, FIGS. FIG. 4 is a schematic configuration diagram showing a conventional electrostrictive drive motor. (la), (lb)...electrostrictive element, (2)...contactor, (3)...rotor, (5)...phase shifter. Note that the same reference numerals in the drawings indicate the same - or A considerable portion is shown. Fig. 1 3: 1 Kommi Jl Jeongsai II rock ridge Fig. 2 Fig. 3 Fig. 4

Claims (1)

[Claims] In a device that drives a rotor using the reciprocating motion of an electrostrictive element, two electrostrictive elements are arranged at right angles, and a phase that shifts the phase of the reciprocating motion of these two electrostrictive elements by 90 degrees. and a common contactor obtained by connecting the movable ends of the two electrostrictive elements, and the contactor and the rotor come into contact with each other during movement of the electrostrictive element to cause the rotor to move. An electrostrictive drive motor characterized by rotation.