JPH03150082A - Wobble motor - Google Patents

Abstract

PURPOSE:To obtain the miniaturization further with large torque by forming gears, meshed with each other, between a stator and a rotor. CONSTITUTION:When voltage is applied successively to each electrode of a stator 10, electrostatic force acts between a rotor 12 and the stator 10 to attract the rotor 12 successively to each electrode. In this way, the rotor 12 rolls while being inscribed to the stator 10, while the rotor itself is axially rotated in an opposite direction to the rolling direction. Here each gear 15, 16 of the stator 10 and the rotor 12 is meshed with each other in a contact position of the rotor 12 with the stator 10 to hold the rotor 12. Consequently, the rotor 12 is axially rotated without slipping on an internal surface of the stator 10, and large torque by the axial rotation of this rotor 12 is taken out to the outside.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a wobble motor that is driven by applying electrostatic force between a stator and a rotor.

<Prior Art> Currently, electromagnetic motors are commonly used for various purposes. However, this type of motor has the disadvantage that when the motor diameter becomes several orders of magnitude smaller, the volumetric efficiency of its electromagnetic force decreases, and the generated torque decreases.

Therefore, in recent years, highly efficient small motors that use electrostatic force as driving force have been proposed, and in particular, wobble motors that have a mechanism that effectively generates torque are attracting attention.

As shown in Fig. 2, this wobble motor has a structure in which a rotor 3 having an outer diameter smaller than the inner diameter is provided in an inner hole 2 of a cylindrical stator l, and a plurality of strip-like Electrodes 4 are arranged in alignment with an insulator 5 in between.

The rotor 3 is inscribed in the inner hole 2 of the stator 1, and by sequentially applying a voltage to each electrode 4 of the stator l to cause an electrostatic force to act between the stator l and the rotor 3,
rotates around the shaft while rolling along the inner surface of the stator l.

3(1) to (5) illustrate a stator l having four electrodes 4a to 4d, each electrode 4 of this stator l.
By sequentially applying voltage to a to 4d, the stator l
An electrostatic force is applied between the electrode 3 and the rotor 3 to attract the rotor 3 to each of the electrodes 4a to 4d in sequence. As a result, the rotor 3 rolls while being inscribed in the inner hole of the stator 1, and the rotor 3 rolls in the direction opposite to the rolling direction (R, -R,)/R.

It rotates with a reduction ratio of Note that R, , R, here are the inner diameter of the stator l and the outer diameter of the rotor 3.

In this case, if the rotor 3 rotates on its axis without slipping on the inner surface of the stator l, it becomes possible to extract a large torque generated by the rotation to the outside.

<Problems to be solved by the invention> However, if the coefficient of friction between the rotor 3 and the stator l is small, there is a drawback that the rotor 3 slides on the inner surface of the stator l, resulting in loss of energy and a decrease in generated torque. .

Further, since the wobble motor is a synchronous motor, if slippage occurs, there is a problem that the wobble motor loses synchronization, steps out, and becomes unable to rotate.

This invention was made by focusing on the above problem, and by adopting a mechanism that prevents the rotor from slipping, it is possible to obtain a large torque with a small size and a novel system that achieves smooth rotation. The purpose is to capture and provide wobble motors.

<Means for Solving the Problems> The present invention provides a rotor having an outer diameter smaller than the inner diameter of the inner hole of the stator, and causes the rotor to be attached to the inner surface of the stator by an electrostatic force acting between the stator and the rotor. In a wobble motor that rotates along its axis while rolling along its axis, gears that mesh with each other are formed between the stator and rotor.

<Operation> When a voltage is sequentially applied to each electrode of the stator, the rotor rotates around its axis while rolling on the inner surface of the stator due to the action of electrostatic force. In this case, the gears on the stator and the gears on the rotor mesh with each other, so that the rotor rotates on its axis without slipping on the inner surface of the stator, and a large torque generated by this rotation on the axis is extracted to the outside.

<Embodiment> FIG. 1 shows the appearance of a wobble motor according to an embodiment of the present invention, which includes a cylindrical stator 10 and a cylindrical rotor 1 disposed in an inner hole 11 of the stator 1o.
It is composed of 2.

The stator 10 has annular gear plates 13 on its upper and lower open end surfaces.
13, and the rotor 12 is provided with disc-shaped gear plates 14, 14 on its upper and lower end surfaces. The rotor 12 has an outer diameter smaller than the inner diameter of the stator 10, and a plurality of electrodes and insulators (not shown) are arranged alternately on the inner surface of the stator 1o.

Inner peripheral surface of both gear plates 13 of stator 10 and rotor 12
Gears 15 and 16 having the same standard pitch are formed on the outer circumferential surfaces of both gear plates 14, and the rotor 12 is sequentially attracted to each electrode of the stator 10 and rotates around the inner circumference of the stator 10 while rotating the shaft. When rotating, both gears 15,16 will mesh with each other in their contact position.

The teeth of the gears 15 and 16 are configured with a tooth height that is less than the difference in diameter between the stator 10 and the rotor 12 so as not to interfere with the rotation of the rotor 12. Even if the length is less than 1 m, the gears 15 and 16 can be manufactured by wire electrical discharge machining, fine etching, etc.

Further, in this embodiment, the gear plates 13.14 are attached to the upper and lower end surfaces of the stator 10 and the rotor 12, but the invention is not limited to this. Gears 15, 16 may be provided centrally along the lengths of the stator 10 and rotor 12, if desired.

In the wobble motor having the above configuration, when a voltage is sequentially applied to each electrode of the stator 10, an electrostatic force acts between the rotor 12 and the stator IO, and the rotor 12 is sequentially attracted to each electrode.

As a result, the rotor 12 rolls while being inscribed in the stator lo, and also rotates around its axis in a direction opposite to the rolling direction.

In this case, each gear 15 of the stator lO and the roller 12
．． 16 is 0-912 and stator l.

The rotor 12 meshes with each other at the contact position with the rotor 12
will be retained. Therefore, the rotor 12 rotates around its axis without sliding on the inner surface of the stator lO, and this rotor 12
A large torque due to the rotation of the shaft is taken out to the outside.

<Effects of the Invention> As described above, in the present invention, gears that mesh with each other are formed between the stator and the rotor, so the rotor can rotate around its axis without slipping on the inner surface of the stator, and can extract a large torque. Furthermore, since the meshing of the gears prevents the occurrence of slippage, no synchronization occurs and smooth rotation is realized, achieving the remarkable effect of achieving the object of the invention.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the appearance of a wobble motor according to an embodiment of the present invention, FIG. 2 is a perspective view showing the appearance of a conventional wobble motor, and FIG. 3 is an explanatory view showing the operating principle of the wobble motor.

Claims (1)

[Claims] A rotor with an outer diameter smaller than the inner diameter is provided in the inner hole of the stator, and the rotor is rotated around its axis while rolling along the inner surface of the stator by electrostatic force acting between the stator and the rotor. A wobble motor, wherein gears that mesh with each other are formed between the stator and rotor.