JPS63144760A - Variable gap type motor - Google Patents

Abstract

PURPOSE:To make a low speed and high torque motor by rotatably supporting a rotor with a cycloreducer composed of a curved plate, outer pins, inner pins and others to get an output of said rotor. CONSTITUTION:A rotor 2 is provided in noncontact manner on the inner face of a stator 1, rotatably supported with a cycloreducer having a curved plate 3, outer pins 4 and inner pins 5, and constituted in the manner of getting an output of said rotatory power. Said curved plate 3 is formed of a planetary gear being like an epitrochoidal wave in external form and revolves round a circular tooth form as a fixed internal sun gear composed of many outer pins 4. Thus, the rotation of the rotor 2 and curved plate 3 is got by an output shaft 6 combined with the inner pins 5, said output shaft 6 is arranged to coincide with the center C, and holes 7 for the inner pins 5 to be freely fitted thereinto are bored in the rotor 2 and curved plate 3. Further, driving for rotation of the rotor 2 is performed by an exciting coil 8 within the stator 1.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention applies the principle of a planetary gear reducer to a low-speed,
This invention relates to a high torque variable gap type motor.

[Prior art and its problems]

Normal motors have high speed and low torque, so when used in so-called servo mechanisms such as positioning, they usually require a reducer, but due to installation space etc., low speed and high torque do not require a reducer. motors are desired.

As such a motor, there has conventionally been a variable gap type motor to which the principle of a planetary gear type reduction gear is applied. This variable gap type motor has a stator 1 as shown in Fig. 5.
A rotor 2 with a diameter r smaller than the inner diameter R of the rotor 2 is eccentrically disposed inside the stator 1, and the rotor 2 is rotationally driven by a coil inside the stator 1. When the rotor 2 rotates around -
Difference between rotor outer circumference length and stator inner circumference length (R/r-1)X
It rotates by 360 degrees in the direction B opposite to the revolution direction A. By extracting this amount of rotation using appropriate means, low-speed, high-torque output is obtained.

However, in the case of such a conventional motor, since rolling on the contact surface between the rotor 2 and the stator 1 is utilized, friction on the rolling surface becomes a problem.

This invention was proposed to solve these problems, and its purpose is to eliminate loss due to friction on the rolling surfaces of the rotor and stator, and to achieve low-speed, high-torque operation with extremely low mechanical loss. An object of the present invention is to provide a variable gap type motor.

[Means for solving problems]

In the gap type motor according to the present invention, a curved plate having a trochoidal waveform is mounted concentrically with the rotor, outer pins having a greater number than the number of teeth of the curved plate are provided on the stator, and outer pins are provided in the rotor and the curved plate. It has a large number of inner pins that loosely fit into the holes, and is provided with an output shaft that can extract the rotational force of the rotor and curved plate.

[For production]

The rotor's rotational drive causes the curved plate to revolve along the outer pin, and the rotation of the curved plate in the direction opposite to the direction of the revolving force is taken out by the inner pin, causing the output shaft to rotate at low speed and high torque.

〔Example〕

The present invention will be described below based on an illustrated embodiment.

As shown in Figures 1 and 3, the rotor 2 is arranged so as not to come into contact with the inner surface of the stator 1, and has a curved plate 3, an outer pin 4,
So-called cyclo reducer (registered trademark) with inner pin 5
This allows it to be rotatably supported and to extract the output of the rotational force.

The curved plate 3 is a planetary gear having an epitrochoid (epitrochoid curve formed by a rolling circle circumscribing a fixed circle) waveform in its outer shape, and has an arcuate tooth shape as a fixed sun internal gear composed of a large number of external pins 4. revolves along. Here, the number of teeth S of the outer pin 4 is slightly larger than the number of teeth P of the curved plate 3, and the curved plate 3 revolves in the A direction at a high angular velocity W1, and after one rotation, the number of teeth S is slightly larger than the number of teeth P of the curved plate 3. It rotates in the opposite direction B at a low angular velocity W2.

This relationship is expressed as "2/"1=(S P)/P, and the smaller the difference in the number of teeth, the larger the oppositely directed reduction gear ratio can be obtained.

Furthermore, by using an epitrochoid curve and an arcuate tooth profile, there is an advantage that there is no tooth tip interference compared to other tooth profiles, and the number of simultaneous teeth can be increased.

The rotor 2 and the curved plate 3 are integrated so as to be concentric, and are rotatably supported so that the shaft parts 2A and 3A are located at the center C of the stator 1, which also serves as a case, and the main body is eccentric with respect to the center C. It is made to be eccentric at e.

The rotation of the rotor 2 and the curved plate 3 is taken out by an output shaft 6 coupled to an inner pin 5. The output shaft 6 is arranged to coincide with the center C, and the rotor 2 and the curved plate 3 are provided with a hole 7 into which the inner pin 5 is loosely fitted.

This hole 7 has a diameter such that it contacts the inner pin 5 at one point and leaves a gap of 20 mm. Therefore, the revolution of the rotor 2 and the curved plate 3 is absorbed, and only the rotation acts on the many inner pins 5, and the output shaft 6 rotates in the B direction at an angular velocity w2.

Note that the outer pin 4 and the inner pin 5 are constructed by attaching rotatable ring rollers, etc., and are in contact with each other, so that mechanical loss is extremely small.

Assuming that the coil C1 is energized, the rotor 2 is attracted to the coil C1 and is in the state shown in Figure 3. At this time, the curved plate 3 and the outer pin 4 are also engaged at the same position. From this state, the coil c2 is energized and the coil C1 is turned off, so that it is attracted to the rotor 2 and revolves in the A direction.

If you do this sequentially for coils C3, C4C5,
If the revolution continues and one revolution is made, the difference in the number of teeth will be 1 in this case.
Therefore, it rotates in the B direction by 1/P rotation, and the output shaft 6
The torque is P times the revolution torque, and a low-speed, high-torque motor can be obtained.

By making it into a nut shape and providing a stem 1' therein, it is possible to create a five-layer structure and achieve even higher torque.

〔Effect of the invention〕

As mentioned above, according to the present invention, the rotor is a cyclo reducer (registered trademark) consisting of a curved plate, an outer pin, an inner pin, etc.
Because it is configured to be rotatably supported and output from the rotor, there is no loss due to friction between the rotor and stator transfer surfaces, and the cyclo reducer (registered trademark)
It is also possible to obtain a low speed, high torque variable gap type motor with extremely low mechanical loss.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of the variable gap type motor according to the present invention, Fig. +2 and Fig. 3 are a cross-sectional view taken along the line ■-■ of Fig. 1-1, and Fig. 4 is a cross-sectional view taken along the line I[-I. A schematic diagram showing a modified example of a rotor and a stator, and Figure 5 is a schematic diagram showing a conventional variable gap type motor. 1... Stator, 2... Rotor, 3...
...Curved plate, 4...Outer pin, 5...
...Inner pin, 6...Output shaft, 7...Hole, 8 (C1, C2, C3, C4...)...Exciting coil

Claims (1)

[Claims] (1) In a variable gap motor in which a rotor with a diameter smaller than the inner diameter of the stator is eccentrically disposed inside the stator and the rotor is driven to rotate, a curved plate having an epitrochoid waveform is attached on a shaft concentric with the rotor, and the curved The stator is provided with outer pins that mesh with the teeth of the plate and have a number greater than the number of teeth of the curved plate, and has a large number of inner pins that loosely fit into holes drilled in the rotor and the curved plate, A variable gap type motor characterized by being provided with an output shaft capable of extracting the rotational force of a rotor and a curved plate.