KR20090045468A - Dc motor for improving a commutation - Google Patents

Abstract

The present invention relates to a DC motor for automobiles with improved rectification, wherein a protrusion formed integrally with the stator yoke inner surface is formed in a space between the N and S pole permanent magnets of the main pole fixedly disposed on the inner side of the stator yoke. By constructing the protrusion to act as a conventional pole to improve the rectification by distortion of the magnetic field, it provides effects such as preventing arc generation and damage of the brush and commutator during rectification, improving the reliability of the DC motor and extending the lifespan. It relates to a DC motor for automobiles.

Automobile, DC motor, electric motor, stator, rotor, pole, permanent magnet, main pole, integral formation, protrusion

Description

DC motor for improving a commutation

The present invention relates to a DC motor with improved rectification, and more particularly, to form a protrusion integrally protruding from the inner side of the stator yoke in the space between the permanent magnets of the main magnetic poles fixedly disposed on the inner side of the stator yoke, the protrusion The present invention relates to a compact and lightweight automotive DC motor having improved rectification, which is configured to serve as a conventional pole pole to improve the rectification by distorting the magnetic field.

In general, in the small DC motor, as shown in the accompanying FIG. 1, the permanent magnet 3 is fixed to the yoke 2 to form a stator 1, and an iron core 5 into the stator 1. And a rotor 4 composed of a coil 6 is disposed.

In this case, a magnetic field in a predetermined direction is formed in the stator 1 by the permanent magnet 3 in a fixed position. Each coil wound in the rotor slot to generate torque corresponding to the magnetic field is attached to FIG. 2. As shown in Fig. 2, it is electrically connected to each side of the commutator 7 of the shaft end so that the magnetic field generated in the rotor remains constant even when the rotor rotates (mechanical switching- [commutation]).

In other words, DC motor has the principle of generating torque by mechanically switching the coil of the rotor. When the commutation action (current reversal by mechanical switching) generates an arc (flashover), the brush (8) and the commutator (7) is to act to damage and shorten the life.

In order to make up for this drawback, it is common to place the poles 9 between the main poles of the stator 1 and to improve the reliability of the DC motor by distorting the magnetic field by the main poles in a good direction, i.e., in the direction of improving rectification. to be.

However, a motor using such a pole is generally applied to a medium- and large-sized motor among DC motors. In the case of a small motor, applying the above-mentioned pole does not only increase the cost but also has a space problem. It is common to use it without applying it.

In the case of applying the pole, a separate process of installing the pole between the main poles of the inner side of the stator is necessary, which may cause excessive number of processes, parts, and cost.

Therefore, the present invention is invented to solve the above problems, by forming a protrusion formed integrally protruding from the inner side of the stator yoke in the space between the permanent magnets of the main magnetic pole fixedly disposed on the inner side of the stator yoke, the protrusion By forming the magnetic field to act as a conventional pole to improve the rectification action, it is possible to prevent the occurrence of arcs and prevent damage to the brush and commutator, improve the reliability of the DC motor and extend the life without the need to install a separate pole. The purpose is to provide a DC motor.

In order to achieve the above object, the present invention, in the DC motor comprising a stator and a rotor and the iron core and the coil is fixedly disposed on the inner surface,

The left and right protrusions have a rectifying action in the left and right spaces between the N pole and the S pole permanent magnets, which become the main poles, on the inner side of the stator yoke, and the protrusions integrally formed by protruding the inner side of the stator yoke inwardly. It is characterized in that it is configured to act as a pole to shape the magnetic field of the city.

In a preferred embodiment, each of the protrusions is characterized in that provided by integrally forming a protruding structure of the iron (凸) shape on the inner surface of the stator yoke.

In another preferred embodiment, the protruding portion is characterized in that it is provided to form a bent cross-sectional structure of each of the formed position portion of the stator yoke of the cylindrical can form indented inward.

According to the DC motor of the present invention having the above characteristics, a protrusion formed integrally with the stator yoke inner surface is formed in the space between the permanent magnets of the main magnetic poles fixedly disposed on the inner side of the stator yoke, and the protruding portion forms a magnetic field. By configuring it to act as a conventional pole to improve the rectifying action, it achieves the purpose of preventing the occurrence of arc during the rectifying action, preventing the damage of the brush and the commutator, improving the reliability of the DC motor and extending the life, as well as the purpose of miniaturization and lightening of the motor. You can do it.

In addition, in the DC motor of the present invention, as the protruding portion of the stator formed integrally protruding serves as a pole, there is no need for a separate step of installing the pole between the main poles of the inner side of the stator yoke, and thus the number of steps and parts This will reduce costs and reduce costs.

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

The present invention relates to a compact, lightweight automotive DC motor with improved rectification, and to a rectification improving technology suitable for use in a small motor while adopting the advantages of the pole.

Basically, as described above, the vortex plays a role of distorting the magnetic flux of the main stimulus.

3 is a view showing the distortion of magnetic flux with and without the pole, and as shown, when the poles 4a and 4b made of magnets of the north pole and the south pole are installed, the rectification is improved. The magnetic flux can be distorted in the direction so that the reliability of the DC motor can be improved.

The present invention is mainly characterized in replacing the role of the poles (4a, 4b) with a mechanical shape, Figure 4 is a cross-sectional view showing the stator structure of the DC motor according to an embodiment of the present invention.

As shown, permanent magnets 3a and 3b of the N pole and the S pole, which are main poles, are fixedly disposed on the inner side of the stator yoke 2 of the DC motor, and are fixedly disposed on the inner side of the stator yoke 2. Stator protrusions 2a and 2b integrally formed in both spaces between the two main magnetic poles are integrally formed.

Each of the protrusions 2a and 2b is formed by integrally forming an iron-shaped protrusion structure on the inner side of the stator yoke 2, and is formed by changing the shape of the inner side of the stator yoke and between the main magnetic poles. The inner surface of the stator yoke 2 is projected from the inner side of the stator yoke to a predetermined height to form protrusions 2a and 2b serving as conventional poles.

Referring to FIG. 4, the protrusions 2a and 2b protrude one by one in each space so as to face 180 ° in both spaces between the two main magnetic poles, when magnetic flux flows in the field of the permanent magnets 3a and 3b. In the drawing, when the left protrusion 2a becomes the S pole, the right protrusion 2b becomes the N pole.

Accordingly, the left and right protrusions 2a and 2b of the present invention have the same polarity as those of the left and right poles 3a and 3b respectively installed in the stator of FIG.

FIG. 5 is a distribution diagram of pore magnetic flux density according to the stator structure of FIG. 4, and shows a comparatively similar distribution when comparing the pore flux density distribution of the present invention and the pore flux density distribution of the pores of FIG. 3. Able to know.

As described above, in the present invention, the rectifying action of the DC motor is improved by modifying the shape of the stator yoke (G) 2 without using a pole formed by attaching separate magnets of the N pole and the S pole to the inner side of the stator yoke. In addition to improving the reliability of the DC motor, it is possible to extend the service life.

On the other hand, Figure 6 is a cross-sectional view showing a stator structure of the DC motor according to another embodiment of the present invention, it will be described as follows.

6 is a structure suitable for a small DC motor, and similarly to the embodiment of FIG. 4 so as to serve as a conventional pole, the protrusions 2a and 2b formed integrally with the inner surface of the stator yoke 2. ) Is formed in both spaces between the two main magnetic poles, respectively, and is formed to have a bent cross-sectional structure in which the stator yoke 2 in the form of a cylindrical can is recessed inwardly at each forming position, thereby forming a protrusion 2a, 2b).

The protrusions 2a and 2b of the stator formed integrally with the bent concave-convex structure as shown are projected one by one in each space so as to face 180 ° in both spaces between the two main magnetic poles. The same as described in the example, this structure is a structure that can implement the conventional pole at the lowest cost.

In this way, according to the DC motor improved the rectifying action of the present invention, by forming a protrusion integrally protruding from the inner side of the stator yoke in the space between the permanent magnet of the main magnetic pole fixedly disposed on the inner side of the stator yoke, the protrusion By configuring the conventional magnetic field to act as a pole to distort the magnetic field, it is possible to provide effects such as prevention of arc generation and damage of the brush and commutator during rectification, improvement of the reliability of the DC motor, and extension of life.

1 is a cross-sectional view showing a conventional DC motor structure,

2 is a view showing a brush and a commutator in a conventional DC motor,

3 is a view showing the distortion of the magnetic flux with and without the stator pole of the stator in the DC motor,

4 is a cross-sectional view showing a stator structure of a DC motor according to an embodiment of the present invention;

FIG. 5 is a distribution chart of void magnetic flux density according to the stator structure of FIG. 4;

6 is a cross-sectional view showing a stator structure of a DC motor according to another embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

1 stator 2 stator yoke

2a, 2b: protrusions 3a, 3b: permanent magnets

Claims (3)

In the DC motor comprising a stator (1) in which permanent magnets (3a, 3b) is fixedly arranged on the inner side, and a rotor (4) in which iron core (5) and coil (6) are arranged, The inner surface of the stator yoke 2 is projected in the left and right side spaces between the N pole and the S-pole permanent magnets 3a and 3b which become the main magnetic poles on the inner side of the yoke 2 of the stator 1, and are integrated. DC motor having a rectifying action, characterized in that the formed protrusions (2a, 2b), the left and right protrusions (2a, 2b) is configured to act as a pole to distort the magnetic field during the rectification action. The method according to claim 1, Each of the protrusions (2a, 2b) is a direct-current motor to improve the rectifying action, characterized in that provided by integrally forming an iron (돌출) protruding structure on the inner surface of the stator yoke (2). The method according to claim 1, The protruding portions 2a and 2b are formed by forming a bent cross-sectional structure in which each formed position portion of the stator yoke 2 in the cylindrical can form is recessed inward. Improved DC motor.

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