KR100334221B1 - Motors and generators using film core and film coil - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric motor and a generator, the configuration of which includes a rotor, a stator, and a housing. When using a brush, a rotor forms an iron core on a rotor and winds a coil around the iron core. And, in the case of brushless, in the electric motor in which the iron core and the coil are formed in the stator, the iron core and the coil formed in the stator are made of a film iron core and a film coil; The film iron core and the film coil may be formed of the rotor by winding the film iron core on the rotating shaft of the rotor when the electric motor uses a brush, and forming the rotor on the rotor, when the brush is not used. After the coil of film is wound in a large cylinder, the film core is wound on the outside and inserted into the cylindrical housing to constitute a stator; The film iron core is divided into a plurality of slits in width to reduce eddy currents; The film cores divided into a plurality of slits are divided into slit lengths equal to the interval of two magnetic poles in the longitudinal direction, and the start and the end of the slits are alternated with neighboring slits, and the length of the slits has a small radius of the film core. Where it is relatively short, and where the radius of the film core is large, it is characterized by a relatively long. In addition, the present invention is equally applied to a generator.

Description

Motor or generator using film core and film coil {MOTORS AND GENERATORS USING FILM CORE AND FILM COIL}

The present invention relates to an electric motor or a generator, and more particularly, to an electric motor or a generator configured by winding and winding the iron core and coil of the motor or generator in a film form to prevent cogging by slots. will be.

For example, FIGS. 1A and 1B show the structure of the conventional generator and its core. In FIG. 1 (b), a rotor is disposed at the center, and the rotor is formed with a coil and an iron core (core). On the outside of the rotor is a stator, ie a permanent magnet fixed to the housing. The coil of the rotor is connected to a brush attached on the surface of the commutator, by which the current generated in the rotor is connected to the outside. The generated current is transmitted to the outside of the generator through the terminal.

In Fig. 1A, the iron core (core) of the rotor is shown. As can be seen in the figure, it can be seen that a plurality of the cores are stacked at a predetermined distance on the same axis as a flat plate. In addition, each iron core has a plurality of salient poles (three in FIG. 1A) formed radially about an axis, and has a shape in which coils are wound in slots formed in the salient poles. The slot is a groove in the iron core for accommodating the rotor windings of the generator, and has an open slot and a half slot.

The iron core of the generator or the motor of the prior art has a flat plate shape and the winding coil is wound in the slot under the salient pole, which makes the manufacturing process complicated and cogging by the slot occurs. Cogging here refers to the variation of the magnetic flux by changing the relative positions of the rotor and stator at various positions of the rotor as the rotor rotates at low speeds, resulting in fluctuations in the torque of the generator or motor.

Therefore, the object of the present invention is to solve the problems resulting from the conventional configuration by winding the core and coil made of film-like integrally to the rotor or stator, unlike the conventional flat iron core laminated and winding the winding coil in the slot And to manufacture an electric motor or a generator having a simple manufacturing process.

Still another object of the present invention is to remove eddy currents generated in the film core of an electric motor or a generator when the film core is used.

1 is a view showing the structure of the generator and the iron core of the prior art

2 (a) and 2 (b) are cross-sectional views of a generator or electric motor according to an embodiment of the present invention in which a film core is applied to a rotor having a brush;

Figure 3 (a) and (b) is a cross-sectional view of a generator or electric motor according to an embodiment of the present invention in which the film core is applied to the stator

4 (a) and 4 (b) illustrate a method of reducing eddy currents generated when the film iron core of the present invention is applied to a rotor or stator of a generator.

FIG. 5 is a view illustrating a film core formed by forming slits longer than two magnetic poles in a film core according to the present invention, and separating the intervals between the slits small.

* Description of the symbols for the main parts of the drawings *

20: axis of rotation 21: film iron core

22: film coil 23: permanent magnet

24: housing (yoke) 40: eddy current

45: slit

The configuration of the present invention for achieving this object, includes a rotor, a stator, and a housing, in the case of using a brush to form an iron core on the rotor and winding the coil on the iron core, in the case of brushless In an electric motor in which iron cores and coils are formed, the iron cores and coils formed in the stator are formed of a film iron core and a film coil.

In addition, in the electric motor of the present invention, when the brush is used, the film iron core is wound on the rotating shaft of the rotor and the film coil is wound thereon to form the rotor, and when the brush is not used, After the film coil is wound on a large cylinder, the film core is wound on the outside and inserted into the cylindrical housing, thereby configuring the stator.

In addition, in the electric motor of the present invention, the film core is characterized in that the width is divided into a plurality of slits in order to reduce the eddy current.

In addition, in the electric motor of the present invention, the film core is divided into a plurality of slits are divided into a length corresponding to the interval of the two magnetic poles in the longitudinal direction and the start and end of the slit is characterized in that the staggered neighboring slits .

In addition, in the electric motor of the present invention, the length of the slit is characterized in that the relatively short where the radius of the film core is small and relatively long where the radius of the film core is large.

In addition, the generator includes a rotor, a stator, and a housing, and in the case of using a brush, an iron core is formed on the rotor and the coil is wound around the iron core. , The iron core and the coil formed on the stator are characterized in that consisting of a film iron core and a film coil.

In addition, in the generator of the present invention, when the brush is used, the film iron core is wound around the rotating shaft of the rotor and the film coil is wound thereon to form the rotor, and when the brush is not used, the rotor is used. After the film coil is wound on a large cylinder, the film core is wound on the outside and inserted into the cylindrical housing, thereby configuring the stator.

In addition, in the generator of the present invention, the film iron core is characterized in that the width is divided into a plurality of slits in order to reduce the eddy current.

In addition, in the generator of the present invention, the film cores divided into the plurality of slits are divided into lengths corresponding to the intervals of the two magnetic poles in the longitudinal direction, and the start and the end of the slits are configured to alternate with the neighboring slits. .

In addition, in the generator of the present invention, the length of the slit is characterized in that the relatively short where the radius of the film core is small and relatively long where the radius of the film core is large.

EXAMPLE

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The examples described below are intended to better understand the present invention and are not intended to limit the invention to these examples.

2A is a cross-sectional view of the motor cut along a direction perpendicular to the direction of the rotation axis of the rotor according to the embodiment of the present invention. As can be seen in the drawing, it can be seen that the film iron core 21, the film coil 22, the permanent magnet 23 and the housing 24 are formed concentrically in the outward direction about the rotation shaft 20. 2B is a cross-sectional view of the motor cut along the direction of the rotation axis. In this figure, it can be seen that a film iron core, a film coil, a permanent magnet, and a housing (yoke) are sequentially formed around the rotating shaft.

The film iron core 21 is made of the same material as the general iron core, such as steel containing silicon, but in the form of a film (thin film). The film iron core 21 is wound around the rotating shaft 20 a predetermined number of times. Subsequently, the film coil 22 in the form of a thin film is also wound outside the film core in a predetermined number of times. The rotor thus formed operates in a cylindrical stator in which a permanent magnet is fixed inside the stator, that is, in the housing. When electric power is transmitted from the outside to the coil of the rotor, the rotor rotates in the permanent magnet, and the motor uses this rotational force.

3A and 3B are cross-sectional views of a brushless electric motor according to another embodiment of the present invention. 2 shows that the film iron core and the film coil of the present invention are wound around the rotor, while the embodiment of FIG. 3 shows that the film iron core and the film coil of the present invention are wound around the stator. That is, in this embodiment, the film coil is wound on a cylinder having a diameter larger than that of the rotor, the film iron core is wound on the outside thereof, and then inserted into a cylindrical housing made of a nonmagnetic material to form a stator. Even in this case, when a current is transmitted to the film coil formed in the stator, the rotor, which is a permanent magnet, rotates, and the electric motor can use the rotational force.

4 is a diagram illustrating an eddy current 40 generated when applying a film iron core to a rotor or stator of an electric motor and a method of reducing the same. 4A is a diagram showing that eddy currents are generated on the surface of the iron core when the film core 21 is not processed, that is, without the slits 45 being formed. The eddy current is generated in the film core over the permanent magnets of two different poles (N, S pole). As can be seen in the figure, eddy currents occur in a number of ellipses throughout the width of the film core. The eddy current generated in the film core is largely generated when the magnetic pole is moved or the film core is inverted and the pole is reversed, resulting in heat loss, thereby raising the temperature of the magnetic material.

Therefore, in the present invention, in order to reduce or minimize such eddy current, the width of the film iron core is divided by using the slit 45 as shown in FIG. As such, when the slits are used to distinguish the film cores, the magnitude of the eddy current decreases in proportion to the square of the width of the film cores. In other words, if the width of the film iron core is divided by the slit, the loop of the eddy current forms a small ellipse as compared with the segment before it can be seen in the drawing. For example, as shown in (b) of FIG. 4, when the entire film core is separated into two film cores by using one slit in the center of the width of the film core, the amount of eddy current is reduced by half. In addition, if the film core is separated into three film cores using slits, the total amount of eddy current is reduced to 1/3. In this way, a slit that is as long as the distance between two magnetic poles is made on the film core, and the gap between the slits is separated into several enough to reduce the eddy current generated on the surface of the iron core as desired.

FIG. 5 is a view showing a film core formed by forming slits longer than two magnetic poles in the film core and separating the gaps between the slits sufficiently small according to the present invention. As can be seen in the figure, it can be seen that the start and end of the smaller divided slits are alternated with the slits of the neighbors. This is for the firmness of the film iron core. In addition, since the radius of the film iron core is changed when the film iron core is wound around the rotor or in the cylinder, the length of the slit is also changed according to the winding. That is, in the small radius, the length of the slit can be adjusted shorter than in the large radius.

The film coil is a coil pattern formed on a flat non-conductive plate. In the case of a motor with a brush, the coil is wound on the outside of the film core. In the case of a motor without a brush, the film coil is wound in a larger cylinder than the rotor and then The film core is wound around and inserted into the cylindrical housing which is nonmagnetic.

The above has been described by taking an electric motor as an embodiment of the present invention, but it can be seen that the same principle can be applied to a generator.

Thus, by applying the film iron core of the present invention to the rotor or stator of the motor or generator together with the film coil, the slot is eliminated, so that cogging caused by the slot can be prevented, and the configuration of the motor or generator can be simplified, resulting in miniaturization and The manufacturing process is simplified. In addition, according to the present invention it is possible to minimize the eddy current generated on the surface of the film iron core has the effect that it is possible to provide a good electric motor or generator.

Claims (4)

An electric motor comprising a rotor, a stator, and a housing, in which a brush is used to form an iron core on the rotor and wind the coil on the iron core, and in the case of a brushless brushless motor, an iron core and a coil on the stator. In The iron core and coil formed on the rotor or stator are composed of a film iron core and a film coil, wherein the film iron core and the film coil, when using a brush, the film iron core is wound on the rotation axis of the rotor and the film thereon The coil is wound to form a rotor. When the brush is not used, the film coil is wound around a cylinder larger than the rotor, and then the film core is wound around the outside to be inserted into a cylindrical housing to form a stator. The motor, characterized in that the width is divided into a plurality of slits to reduce the eddy current. The method of claim 1, The plurality of slit film core is divided into a length corresponding to the distance between the two magnetic poles in the longitudinal direction and the start and end of the slit is characterized in that the staggered neighboring slit is configured. 5. The motor according to claim 4, wherein the length of the slit is relatively short where the radius of the film core is small and relatively long where the radius of the film iron core is large. The generator which uses the film iron core and film coil used in any one of Claims 1, 4, and 5 as an iron core and a coil.