KR101790448B1 - Motor - Google Patents

Abstract

One embodiment of the present invention is a motor including a stator coupled to a housing, a first rotor provided below the stator, and a second rotor provided above the stator, wherein the first rotor and the second rotor The rotor and the second rotor are respectively provided with permanent magnets so as to face the stator, and the stator is disposed between the upper plate and the lower plate, and between the upper plate and the lower plate Wherein the iron core portion is in the form of a circular bar extending in the same direction as the central axis and the lower end and the upper end of the iron core portion are disposed facing the permanent magnets of the first rotor and the second rotor, And a coil is wound around the iron core portion.

Description

Motor {MOTOR}

The present invention relates to a motor, and more particularly, to a motor having a stator in which a coil is wound along an axial direction and a pair of permanent magnet rotors located at upper and lower ends of the stator, The present invention relates to a motor in which the energy efficiency is increased by using all of them.

Recently, as the development of new transportation means such as an electric car and an electric bicycle has become active, there is an increasing interest in improving the performance of the motor used. A motor is a device that converts electrical energy into mechanical rotational energy, and its performance is usually expressed as output and efficiency.

The output is the magnitude of the mechanical energy generated at the output shaft of the motor, which is calculated by multiplying the torque by the number of revolutions per second (rpm). Efficiency represents the ratio of the amount of energy (electrical energy) input to the motor to the energy (mechanical energy) output from the motor in percent. In the case of motors for electric vehicles, efficiency of more than 90% is achieved recently.

The output and efficiency of the motor depend on the strength of the magnet, the winding of the coil, the distance from the center of the shaft to the magnet, and so on.

Conventional general motors input electric current to a rotor through a brush, and accordingly attraction and repulsive force are generated between the permanent magnet and the stator by the induced magnetic field, so that the rotor rotates. This type of DC motor has a large loss due to mechanical friction, so that even if other elements are properly designed, the output and efficiency are not high.

To improve this, a motor having a changed position of the rotor and the stator was developed. For example, FIGS. 1 and 2 show the structure of a conventional general stepping motor. A coil 210 is wound around an iron core fixed to the inner wall of the housing 100 to form a stator 200, And a permanent magnet 310 is installed on the magnet 300.

In this stepping motor, only one end of the stator 200 is opposed to the permanent magnet 310 of the rotor 300, and therefore, only the half or less of the electric field generated in the stator 200 by the supplied current is used as the rotating power It becomes a sum.

Therefore, a motor with a new structure that overcomes this inefficiency is required. Particularly, there is a demand for a high-efficiency motor that does not increase the size of the structure while increasing the efficiency and output of the conventional motor for use as a power source for electric vehicles and electric bicycles.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems by providing a stator having a coil wound around an axial direction and a pair of permanent magnet rotors located at upper and lower ends of the stator, And to provide a motor with increased energy efficiency.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the precise form disclosed. There will be.

According to an aspect of the present invention, there is provided a motor including a stator coupled to a housing, a first rotor disposed below the stator, and a second rotor disposed above the stator, Wherein the first rotor and the second rotor are respectively fixed to a central shaft, permanent magnets are provided on the first rotor and the second rotor so as to face the stator, respectively, and the stator includes a top plate, And an iron core disposed between the upper plate and the lower plate, wherein the iron core is in the form of a circular bar extending in the same direction as the central axis, and a lower end and an upper end of the iron core are respectively connected to the first rotor and the second rotor A center portion and a lower portion, the diameter of the center portion being smaller than the diameter of the upper portion and the lower portion, and a plurality of coils Wherein the first rotor and the second rotor are respectively coupled to a lower connecting plate and an upper connecting plate, wherein the lower connecting plate and the upper connecting plate are formed with through holes into which the central axis is inserted, And a second connecting member extending from an outer circumferential surface of the first connecting member and coupled to the first rotor or the second rotor with a coupling hole, .

In an embodiment of the present invention, the permanent magnets provided respectively in the first rotor and the second rotor may be circular.

In the embodiment of the present invention, the polarities of the permanent magnets of the first rotor and the second rotor disposed at the lower end and the upper end of the iron core portion may be different from each other.

In the embodiment of the present invention, when the permanent magnets of the first rotor are disposed at the lower ends of the iron cores, the upper ends of the iron cores are disposed between two adjacent permanent magnets of the second rotor .

According to the embodiment of the present invention, energy efficiency can be increased by using all of the upper and lower surfaces of the electric field formed in the coil. Particularly, it is possible to provide a high-efficiency motor which does not increase the size of the structure while increasing the efficiency and the output of the conventional motor for use as a power source for electric vehicles and electric bicycles.

It should be understood that the effects of the present invention are not limited to the above effects and include all effects that can be deduced from the detailed description of the present invention or the configuration of the invention described in the claims.

1 is an exploded perspective view schematically showing a structure of a conventional motor.
2 is a transverse cross-sectional view of the motor according to Fig.
3 is an exploded perspective view schematically showing a structure of a motor according to an embodiment of the present invention.
4 is a longitudinal sectional view of a motor according to an embodiment of the present invention.
5 is a schematic view showing an iron core of the motor according to FIG.
6 is a schematic view showing the rotor of the motor according to Fig.
7 is a schematic view showing the stator of the motor according to Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is referred to as being "connected" (connected, connected, coupled) with another part, it is not only the case where it is "directly connected" "Is included. Also, when an element is referred to as "comprising ", it means that it can include other elements, not excluding other elements unless specifically stated otherwise.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises" or "having" and the like refer to the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 3 is an exploded perspective view schematically showing a structure of a motor according to an embodiment of the present invention, Fig. 4 is a longitudinal sectional view of the motor according to the embodiment of the present invention, Fig. 5 is a schematic view showing an iron core of the motor according to Fig. 6 is a schematic view showing the rotor of the motor according to Fig. 4, and Fig. 7 is a schematic view showing the stator of the motor according to Fig. For reference, FIG. 3 is a diagram showing an axial distance exaggerated from the actual for convenience of understanding.

3 and 4, the motor 1 includes a stator 20 coupled to the housing 10, a first rotor 30a provided below the stator 20, a stator 20, And a second rotor 30b provided on the upper side of the second rotor 30b.

That is, by providing the pair of rotors 30a and 30b on the upper side and the lower side of the stator 20 wound with the coils, both the upper and lower surfaces of the electric field generated when a current flows in the coils can be used, The utilization efficiency of energy is increased. That is, all of the positive poles of the electric field generated by the coil can be used as the rotating power.

The outer shape of the motor 1 may be composed of an upper cover 50 and a lower cover 60 which close the upper opening and the lower opening of the housing 10 and the housing 10. [ The housing 10, the upper cover 50 and the lower cover 60 may each be a separate member and may alternatively be all or part of the housing 10, the upper cover 50 and the lower cover 60 May be an integral member.

A center shaft 40 is disposed at the center of the motor 1 and the center shaft 40 can be exposed to the outside through the upper cover 50 and the lower cover 60. A rod 70 may be connected to either side of the central axis 40.

It is also possible that the central axis 40 is exposed to the outside only in one of the upper side and the lower side of the central axis 40. [ It is also possible that the rod 70 is connected to both sides of the central shaft 40.

An upper sealing portion 51 may be provided at a portion where the center shaft 40 and the upper cover 50 contact with each other and a lower sealing portion 61 may be provided at a portion where the central shaft 40 and the lower cover 60 are in contact with each other. May be provided. The upper sealing portion 51 and the lower sealing portion 61 are provided for smooth rotation of the center shaft 40 and sealing of the inside of the motor and can have an appropriate lubrication function for this purpose. The upper sealing portion 51 and the lower sealing portion 61 may be provided as bearings.

Hereinafter, the structure of the stator 20 and the rotor 30 will be described in more detail.

3 and 4, the stator 20 may include a lower plate 21, an upper plate 22, and an iron core portion 23 in which the lower plate 21 and the upper plate 22 are disposed. have. The upper plate 22 and the lower plate 21 of the stator 20 can be fixedly coupled to the housing 10 through the first coupling hole 81 and the second coupling hole 82, There is no. That is, the first engagement hole 81 and the second engagement hole 82 may be bolts, rivets, or other mechanical elements. 4, the upper plate 22 and the lower plate 21 of the stator 20 may be integrally formed with the housing 10.

3 and 4, the iron core portion 23 may have the shape of a circular bar extending in the same direction as the central axis 40. Referring to FIG. 5, the iron core portion 23 may be in the form of a circular bar having a step in the axial direction. That is, the iron core portion 23 is composed of the upper portion 231, the central portion 232 and the lower portion 233, and the diameter of the center portion 232 is smaller than the diameter of the upper portion 231 and the lower portion 233 It can be a larger form. Alternatively, the diameter of the center portion 232 may be smaller than the diameter of the upper portion 231 and the lower portion 233.

The coil 234 may be wound a plurality of times on the central portion 232 of the iron core portion 23 and an electric field may be formed around the iron core portion 23 by the current flowing through the coil 234. The lower end and the upper end of the iron core portion 23 may be disposed to face the permanent magnets of the first rotor 30a and the second rotor 30b, respectively, and details thereof will be described later.

6, the lower plate 21 of the stator 20 may be provided with a plurality of circular coupling holes 24 spaced equidistantly in the circumferential direction. In the coupling holes 24, an iron core portion 23 May be connected to the lower portion 233 of the main body 210. [ A stator center hole 25 having a diameter larger than that of the center shaft 40 may be provided at the center of the stator 20. Since the upper plate 22 of the stator 20 has the same shape as the lower plate 21, a detailed description thereof will be omitted.

3 and 4, the first rotor 30a and the second rotor 30b may be fixed to the central shaft 40, respectively. The first rotor 30a and the second rotor 30b may be provided with permanent magnets facing the stator 20, respectively. 4, a first permanent magnet 31 is provided at a position facing the stator 20 in the first rotor 30a disposed on the lower side of the stator 20, A second permanent magnet 32 may be provided at a position facing the stator 20 in the second rotor 30b disposed on the upper side.

The structure of the rotor 30 will be described with reference to FIG. The rotor 30 may have a rotor plate 35 and a plurality of first permanent magnets 31 spaced equidistantly in the circumferential direction on the rotor plate 35. The structures of the first rotor 30a and the second rotor 30b are substantially the same. A rotor center hole 36 having the same diameter as the center axis 40 may be provided at the center of the rotor 30 so that the center axis 40 can be engaged.

4, the lower connecting plate 33 and the upper connecting plate 34 are inserted into the center portions of the first rotor 30a and the second rotor 30b, respectively, And the upper connecting plate 34 and the upper connecting plate 34 may be fixedly coupled to the center shaft 40. The second rotator 30b and the upper connecting plate 34 are coupled by the third coupling hole 83 and the upper connecting plate 34 and the central shaft 40 are coupled by the fourth coupling hole 84. [ . The same applies to the first rotor 30a. The third coupling hole 83 and the fourth coupling hole 84 may be bolts, rivets, or other mechanical elements, and the coupling method thereof is not particularly limited.

The first permanent magnet 31 provided in the first rotor 30a and the second permanent magnet 32 provided in the second rotor 30b may be circular. The polarities of the permanent magnets of the first rotor 30a and the second rotor 30b disposed at the lower end and the upper end of the iron core portion 23 of the stator 20 may be different from each other.

That is, when the polarity of the first permanent magnet 31 on the side opposite to the lower end of one of the iron core portions 23 is N poles, the second permanent magnets 32 on the opposite side to the upper ends of the iron core portions 23 ) May be the S pole. In the case of both the first rotor 30a and the second rotor 30b, the polarities of a plurality of permanent magnets provided on the same plane are alternately arranged, that is, N poles, S poles, N poles, S poles . ≪ / RTI >

On the other hand, the first and second rotors 30a and 30b facing each other may be arranged so that the permanent magnets are staggered from each other. That is, when the first permanent magnet 31 of the first rotor 30a is disposed at the lower end of the iron core portion 23 so that the first permanent magnet 31 is closest to the lower end of the iron core portion 23, Can be disposed between adjacent second permanent magnets (32).

As is well known, the distance traveled by one charge for electric vehicles, electric bicycles and the like is a key factor in the spread of these modes of transportation. A motor according to the present invention is a stepping motor having a stator in which coils are wound along an axial direction and a pair of permanent magnet rotors located at upper and lower ends of the stator, The efficiency can be greatly increased. When such a motor is employed in an electric automobile or an electric bicycle, the output and efficiency are both increased in comparison with the space occupied by the motor.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

1: motor
10: Housing
20: Stator
21: Lower plate
22: Top plate
23: iron core part
30: Rotor
30a: 1st electron
30b: second electron
31: first permanent magnet
32: second permanent magnet
40: center axis
50: upper cover
60: Lower cover
70: Load

Claims (4)

A stator coupled to the housing,
A first rotor provided below the stator,
And a second rotor provided on the upper side of the stator,
Wherein each of the first rotor and the second rotor is fixed to a central axis, and each of the first rotor and the second rotor has permanent magnets facing the stator,
The stator includes an upper plate, a lower plate, and an iron core disposed between the upper plate and the lower plate,
Wherein the iron core portion is in the form of a circular bar extending in the same direction as the central axis and the lower end and the upper end of the iron core portion are disposed facing the permanent magnets of the first rotor and the second rotor respectively, Wherein a diameter of the center portion is smaller than a diameter of the upper side portion and the lower side portion, a coil is wound a plurality of times on the center portion,
The first rotor and the second rotor are respectively coupled to the lower connecting plate and the upper connecting plate,
The lower connecting plate and the upper connecting plate
A first connecting member having a through hole through which the central shaft is inserted, the first connecting member being coupled to the central shaft with a coupling hole,
And a second connecting member that extends perpendicularly from an outer circumferential surface of the first connecting member and is engaged with the first rotor or the second rotor with a coupling hole.
The method according to claim 1,
Wherein the permanent magnets provided respectively in the first rotor and the second rotor are circular.
The method according to claim 1,
And the polarities of the permanent magnets of the first rotor and the second rotor disposed at the lower end and the upper end of the iron core portion are different from each other.
The method according to claim 1,
And the upper end of the iron core portion is disposed between two adjacent permanent magnets of the second rotor when the permanent magnets of the first rotor are disposed nearest to the lower end of the iron core portion.

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