JPH05199734A - Motor - Google Patents

Abstract

PURPOSE:To provide a motor capable of rotating smoothly and excellent in efficiency without a bearing. CONSTITUTION:A plurality of rollers 26 with circular peripheries consisting of permanent magnets are arranged between a rotor 12 with circular periphery and a circular rolling face 24 provided to surround that rotor 12, so that they may contact with those rotors 10 and rolling face 24, and while supporting the rotors 10 rotatably through these plural rollers 26, the rotor 10 is rotated by the magnetic attraction or the resiliency between the rotor 10 and the rollers 26, and also the rollers 26n are revolved along the rolling face 24 while rotating around their own axes.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric motor, and more particularly to an electric motor having a rolling element made of a permanent magnet.

[0002]

BACKGROUND OF THE INVENTION Generally, an electric motor has a coil wound around an armature core 100 as shown in FIG. 2 and a current is passed through the coil to generate an N pole and an S pole on the rotor 102 side. The rotor 102 is rotated by a magnetic attraction force or a repulsive force between the N pole and the S pole on the side of the rotor 102 and the stator 104.

By the way, in this electric motor, the stator 1
There is a predetermined air gap between the inner surface of the meniscus shape of the 04 side magnet and the rotor 102.

This gap is necessary to allow the rotation of the rotor, but if such a gap exists, the magnetic attraction force and repulsion force between the rotor and the stator will be weakened, and the gap will be reduced.
Efficiency is reduced. Therefore, it is desirable that such a gap be as small as possible.

However, this gap is constant in consideration of the machining accuracy of the inner surface of the half-moon shape of the magnet on the side of the stator, the misalignment during assembly, and the rattling of the bearing that rotatably supports the shaft end of the rotor. Difficult to shrink below,
There is naturally a limit to the reduction.

Further, in the case of this electric motor, since the rotating shaft of the rotor is rotatably supported by the bearing, not only such a bearing is required as an electric motor component, but also the manufacturing accuracy of the electric motor is deteriorated by this bearing. There is such a problem.

[0007]

The present invention has been made to solve the above problems, and its gist is to provide a rotor having a circular outer peripheral surface and a circular shape provided so as to surround the rotor. A plurality of rolling elements provided with a circular outer peripheral surface made of a permanent magnet between the rolling surface and the rolling surface are arranged so as to be in contact with the rotor and the rolling surface, and through the plurality of rolling elements, While rotatably supporting the rotor, the rotor is rotated by a magnetic attraction force or repulsive force between the rotor and the rolling element, and the rolling element is rotated along the rolling surface. It was made to make an orbital movement.

[0008]

In the electric motor of the present invention, the permanent magnet for exerting a magnetic attractive force and a repulsive force on the rotor is formed as a rolling element.

The rolling element is arranged so as to contact the outer peripheral surface of the rotor and the rolling surface, and the rolling element rotatably supports the rolling surface with the rolling surface as a supporting surface.

Therefore, the bearing which has been conventionally required becomes unnecessary in the electric motor of the present invention. Further, since the bearing is unnecessary, the manufacturing accuracy of the electric motor is improved.

Further, since the rolling element revolves around the rolling surface while rotating, the smooth rotation of the rotor is ensured and the magnet on the rotor side and the permanent magnet for driving the magnet (conventional magnet). (Corresponding to the magnet on the side of the stator) has a zero air gap, so that a large magnetic attraction force and repulsive force can be applied between them, and the efficiency of the electric motor can be further improved.

It is desirable that the rolling element composed of this permanent magnet is magnetized easily if the rolling element has a hollow pipe shape and the outer peripheral surface is the N pole and the inner peripheral surface is the S pole or its opposite polarity.

Further, it is desirable to provide a retainer for keeping the circumferential spacing of the rolling elements at a constant spacing because the operating characteristics of the electric motor can be stabilized.

[0014]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 shows a schematic configuration of a DC electric motor according to an embodiment of the present invention, in which 10 is a rotor having a circular outer peripheral surface, and a plurality of armature cores 12 are provided with coils 1
It is constructed by winding four.

The coil 14 is connected to a power source 20 via a commutator 16 and a brush 18, and receives a current supply via these.

The rotor 10 is housed inside a circular casing 22. The inner surface of the casing 22 is configured as a circular rolling surface 24, and a plurality of rolling elements 26, 26 are provided so as to be in contact with the circular rolling surface 24 and the circular outer peripheral surface of the rotor 10. 28 is arranged between them.

The rolling elements 26, 28 rotatably support the rotor 10 by revolving along the rolling surface 24 while rotating on their own axis. 28 is formed in a hollow pipe shape.

The rolling elements 26 and 28 are the retainer 3
With 0, the circumferential distance is kept constant.

One of the rolling elements 26 is configured as a permanent magnet for driving the rotor 10 by applying a magnetic attraction force and a repulsive force between the rolling element 26 and the rotor 10, and one rolling element 26 is used here. The outer peripheral surface side of the rotor 26 is magnetized to the S pole and the inner peripheral surface side is magnetized to the N pole, and in the other rolling element 26, the outer peripheral surface side is magnetized to the N pole and the inner peripheral surface side is magnetized to the S pole. .

In the case of the electric motor of this embodiment, when current is supplied to the coil 14 and S pole and N pole are generated in the rotor 10, magnetic attraction force and repulsion between the rotor 10 and the rolling element 26 are generated. The force drives the rotor 10 to rotate.

At this time, the rolling elements 26, 28 rotate around their outer peripheral surfaces in contact with the outer peripheral surface of the rotor 10 and the rolling surface 24, and also revolve around the rolling surface 24. By this movement, the rotor 10 is supported and smoothly rotated.

In this electric motor, the rolling elements 26, 28
Acts as a bearing, the bearing conventionally required to receive the shaft portion of the rotor 10 is unnecessary.

Further, since the rotor 10 and the rolling elements 26, that is, the permanent magnets are always in contact with each other and there is no air gap between them, the magnetic attraction force and repulsive force between them are generated. Can be effectively used as the rotational driving force of the motor, and the efficiency of the electric motor can be increased.

Although the embodiment of the present invention has been described in detail above, this is merely an example. In the present invention, for example, the number of armature cores in the rotor can be increased to make the rotation smoother, and the rolling element 28 can be configured as a permanent magnet or a rolling element including a permanent magnet. It is also possible to appropriately increase the number of

Further, the diameter of the rotor and the diameter of the rolling element can be appropriately selected so that the magnetic attraction force and the repulsive force effectively act between the rotor and the rolling element. etc,
The present invention can be configured in a form in which various modifications are made based on the knowledge of those skilled in the art without departing from the spirit of the present invention.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of a DC motor that is an embodiment of the present invention.

FIG. 2 is an explanatory diagram for explaining the background of the present invention.

[Explanation of symbols]

 10 Rotor 24 Rolling surface 26 Roller 30 Retainer

Claims (3)

[Claims] 1. A rolling element having a circular outer peripheral surface made of a permanent magnet between a rotor having a circular outer peripheral surface and a circular rolling surface provided so as to surround the rotor. A plurality of elements are arranged in contact with the child and the rolling surface, and while supporting the rotor rotatably through the plurality of rollers, a magnetic attraction force or repulsion between the rotor and the roller is provided. An electric motor characterized in that the rotor is rotated by a force and the rolling element is caused to revolve along the rolling surface while causing the rolling element to rotate. 2. The electric motor according to claim 1, wherein the rolling element is in the shape of a hollow pipe, and the outer peripheral surface side is magnetized as N pole and the inner peripheral surface side is magnetized as S pole or vice versa. 3. The electric motor according to claim 1, further comprising a retainer for maintaining a constant circumferential distance between the plurality of rolling elements.