KR20060031272A - Heat radiator of rotater for an outer rotater type motor - Google Patents

Abstract

Disclosed is a heat radiator for an outer rotor type motor capable of improving cooling efficiency of a motor by discharging air inside a motor when the rotor rotates in a forward direction and sucking air outside the motor when rotating in a reverse direction. The heat dissipation device is provided with a plurality of radiators radially with respect to the center of the rotor to induce heat radiation by moving the air during the rotation of the rotor. The heat dissipation unit may include a portion of the forward heat dissipation hole formed in the rotor to bend and extend toward one side of the rotor to move air to the forward heat dissipation hole in the forward rotation of the rotor; And a reverse braid for extending a portion of the reverse heat dissipation hole formed in the rotor to the other side of the rotor so as to face the opposite direction to the forward braid to move air to the reverse heat dissipation hole when the rotor rotates in the reverse direction. . According to this heat dissipation device, when the rotor rotates in the forward direction, the air inside the motor is discharged to the outside through the forward heat radiating hole by the forward braid, and when the rotor rotates in the reverse direction, the air outside the motor is reversed by the reverse braid. Since it is introduced into the interior through the hot hole is provided an effect of improving the cooling efficiency of the motor.

Rotor, outer, motor, cooling, heat dissipation

Description

Heat radiator for rotor for outer rotor type motor {HEAT RADIATOR OF ROTATER FOR AN OUTER ROTATER TYPE MOTOR}

1 is a partially cutaway perspective view showing a preferred embodiment according to the present invention.

FIG. 2 is a schematic plan view of the heat dissipation device shown in FIG. 1. FIG.

3A and 3B are views for explaining the operation of the heat dissipation device shown in FIG. 1, and 3A and 3B are enlarged cross-sectional views taken along line A-A of FIG. 2.

Figure 4 is a perspective view showing a radiator of the rotor according to the prior art.

5 is an enlarged cross-sectional view of a portion of the heat dissipation device shown in FIG. 4.

<Description of Symbols for Main Parts of Drawings>

10: rotor 20: rotor

21: incision 22A: forward braid

22B: Reverse Braid

The present invention relates to a heat radiator of a rotor for an outer rotor type motor, and in particular, a forward braid for inducing heat radiation when the rotor rotates in the forward direction, and a reverse braid for inducing heat radiation when the rotor rotates in the reverse direction, respectively. By forming, the heat dissipation is performed by the forward braid when the rotor rotates in the forward direction, and relates to the heat dissipation device of the rotor that can be radiated by the reverse braid when rotating in the reverse direction.

In general, among the various motor starting methods, an induction electromotive force-type motor synchronized with an induction electromotive force is a kind of AC motor in which rotation force is generated by interaction between a rotating magnetic field generated in the stator portion and an induction magnetic field generated in the rotor portion. Belongs to the rotating magnetic field.

It can be variously designed as single phase, three phase induction motor, three phase winding type induction motor, etc., and is one of the most easy-to-use motors among AC motors. Such induction electric motors are suitable as power motors due to the characteristics of rotational speed and long lifespan according to the load, and among the small ones, single phase condenser motors are most widely used.

In the basic configuration of the induction electric motor as described above, the induction magnet generated from the stator is supported by a rotating shaft supported by the housing and a stator that is fixed to the housing and receives power from the outside through a coil wound to generate the induction magnet, and a bearing installed in the housing. It is provided with a rotor that rotates with the rotary shaft coupled by.

Such an induction electric motor is a current induced in the secondary winding by the electromagnetic induction of the primary winding connected to the power source, and obtains the rotational force by the interaction of the current and the rotating magnetic field induced in the secondary winding, the stator and the rotor It is divided into inner rotor type and outer rotor type according to the relative position.

Inner rotor-type induction motors have a limited rotor radius as the rotor rotates through the inside of the stator, which reduces the utility of the internal space with the disadvantage of less torque produced in the same volume. Recently, an outer rotor type induction motor has been disclosed in which a rotor is provided outside the stator to increase torque at the same volume and utilize the internal space of the stator for other purposes.

The outer rotor type induction motor has a characteristic in which a rotor composed of a drive shaft, a magnet, a rotor case, etc., rotates outside the stator composed of an iron core, a core, a base, a bearing, and the like, that is, the rotor rotates around the stator.

The outer rotor type induction motor is recently employed as a drive motor of a drum washing machine, and the rotor of the outer rotor type induction motor used in such a drum washing machine is shown in FIG. 4.

In the conventional outer rotor type induction motor, the rotor is manufactured by forming a shape of the iron plate frame 510 by pressing or the like, and then placing a piece of permanent magnet 540 on the back yoke 513 of the iron plate frame 510. Pieces of permanent magnet 540 to wear resin is fixed to the back yoke (513).

Then, the connecting member 530 is fastened to the fastening means insertion hole 511b of the rotor 512 installed on the bottom of the iron plate frame 510 with a bolt 532 to connect the connecting member 530 to the iron plate frame 510. To combine.

On the other hand, the rotor 512 is formed by cutting a plurality of braids (512A), the braid 512A moves the air during the rotation of the rotor 512 to heat the heat generated inside the steel plate frame 510 It has a function to discharge to the discharge hole (512B).

However, since the braid 512A of the conventional rotor-type motor having such a structure is bent in one direction as shown in FIG. 5, the rotor 512 is oriented in one direction (for example, forward or clockwise). Air was only moving when it was rotated.

Therefore, when the rotor 512 is rotated in the reverse direction, it is a problem that the heat radiation efficiency is lowered due to insufficient air movement.

That is, since the braid 512A according to the prior art is bent inclined only in one direction (for example, in the forward direction), only a large amount of air is guided to the heat radiating hole 512B when the rotor 512 is rotated in the forward direction. . However, the braid 512A has a problem in that the rotor 512 is not rotated in the reverse direction and thus does not receive resistance, thereby insufficiently generating air movement necessary for heat radiation, thereby lowering the cooling efficiency of the motor.

The present invention has been made to solve the problems of the prior art as described above, the technical problem of the present invention is the air required for cooling the motor even if the rotor of the motor rotates in the forward or reverse direction (or clockwise, counterclockwise) To sufficiently induce the flow of the heat dissipation effect, that is to provide a heat dissipation device of the rotor that can maximize the cooling effect.

The present invention for solving the above technical problem, in the rotor for outer rotor type motor,

A plurality of radiators are provided radially with respect to the center of the rotor to induce heat radiation by moving the air during the rotation of the rotor,

The heat dissipation unit,

A portion of the forward heat radiating hole formed in the rotor is bent and extended to one side of the rotor to move air to the forward heat radiating hole when the rotor rotates forward; And

A portion of the reverse heat dissipation hole formed in the rotor is bent and extended to the other side of the rotor so as to face in the opposite direction to the forward braid; a reverse braid for moving the air to the reverse heat dissipation hole during the reverse rotation of the rotor; Provided is a heat dissipation device of a rotor for an outer rotor type motor.

On the other hand, the forward braid and the reverse braid is characterized in that the bent at an angle of inclination with respect to the rotor.

In this way, since the forward braid and the reverse braid are bent to face different directions on one side and the other side of the rotor, when the rotor rotates in the forward direction, the forward braid moves air to induce heat dissipation, and the rotor in the reverse direction. When rotating, the reverse heating plate moves air to induce heat dissipation.

Therefore, sufficient heat dissipation effect can be expected even if the rotor rotates in any direction. The heat dissipation action (cooling action generated by moving air) of each braid efficiently cools the heat generated during operation of the motor, so that the life of the component can be extended.

When described in detail with reference to the accompanying drawings a preferred embodiment of the present invention having such features as follows.

In the accompanying drawings, Figure 1 is a partially cutaway perspective view showing a preferred embodiment according to the present invention, Figure 2 is a schematic plan view of the heat dissipation device shown in Figure 1, Figure 3a, 3b is a heat dissipation device shown in Figure 1 AA line enlarged sectional drawing of FIG. 2 for demonstrating operation | movement of.

Hereinafter, 'one side' refers to the upper surface of the rotor 20 based on FIG. 1 or FIGS. 3A and 3B, and 'other side' refers to the bottom surface of the rotor 20. In addition, since the outer rotor-type motor to which the present embodiment is applied is a known technology, a detailed description thereof is replaced by the prior art.

As shown in FIGS. 1 to 3A and 3B, the heat dissipation device of the rotor according to the present embodiment includes a heat dissipation part 22 formed of a forward braid 22A and a reverse braid 22B having a center of the rotor 20. It has a structure that is formed in a plurality radially on the basis.

In more detail, as shown in FIG. 2, a portion of the edge of the forward heat dissipation hole 24A is bent to one side of the rotor 20 to form the forward braid 22A, as shown in FIG. 2. A portion of the edge of the hot hole 24A extends and bends to the other side of the rotor 20 to form the reverse braid 22B.

That is, as shown in FIG. 2, the forward heat dissipation hole 24A and the reverse heat dissipation hole 24B have a structure formed by cutting in opposite directions with each other between the center connection parts. Accordingly, the forward braid 22A is formed by bending a portion of the forward heat radiating hole 24A to one side of the rotor 20, and the reverse braid 22B is a cutting part of the reverse heat radiating hole 24B. A part is formed by bending to the other side of the rotor (20).

At this time, the forward braid 22A and the reverse braid 22B each have a constant inclination angle to face the direction of rotation. That is, the forward braid 22A is bent to have a constant inclination angle to face in the forward direction (for example, clockwise), and the reverse braid 22B has a constant inclination angle to face in the reverse direction (for example, counterclockwise). It is bent to have.

This inclination angle is intended to allow air to be guided to the inclined braids 22A and 22B when the rotor 20 rotates to the heat dissipation holes 24A and 24B.

At this time, the forward braid 22A and the reverse braid 22B are bent to have a constant angle with respect to the horizontal plane (one side or the other side) of the rotor 20. That is, each of the forward braid 22A and the reverse braid 22B is bent at an angle of 40 ° to 90 ° with respect to one side (upper surface) or the other side (lower surface) of the rotor 20. This is for each braid 22A, 22B to guide air easily to each of the heat radiating holes 24A, 24B. At this time, when the angles of the braids 22A and 23B are less than 40 ° or 90 ° or more, the air cannot be sufficiently led to the heat radiating holes 24A and 24B. Therefore, each of the braids 22A and 22B preferably has an inclination angle of 45 ° to 60 ° with respect to the horizontal plane of the rotor 20 to move air to the heat radiating holes 24A and 24B.

Referring to the operation of the present embodiment configured as described above are as follows.

A plurality of forward braids 22A are formed to be bent toward one side of the rotor 20, and a reverse braid 22B bent in a direction opposite to the forward braids 22A is formed at the other side of the rotor 20. When the rotor 20 is rotated in the forward direction as shown in 3a in the formed state, the forward braid 22A rotates in the forward direction to induce air to move to the forward heat radiating hole 24A.

As such, the forward braid 22A moves the air to the forward heat radiating hole 24A so that the air inside the motor can be discharged to the outside.

At this time, since the reverse braid 22B is bent at a predetermined inclination angle in a direction opposite to the direction in which the rotor 20 rotates, the reverse braid 22B is not subjected to air resistance, and thus does not move the air to the reverse heat generating hole 24B. can not do it.

That is, when the rotor 20 rotates in the forward direction, the forward braid 22A is bent at a predetermined angle of inclination toward the direction of rotation, thereby receiving air resistance, and as a result, as shown in FIG. 3A. Air is guided to the forward braid 22A and moved to the forward heat dissipation hole 24A, but since the reverse braid 22B is bent at a predetermined angle of inclination toward the opposite direction of rotation, it is not subjected to air resistance, This results in blocking the air from entering the reverse heat dissipation hole 24B.

In this process, when the rotor 20 rotates in the forward direction, air inside the motor (air on the upper side of the rotor) is discharged to the outside through the forward heat radiating hole 24A by the forward braid 22A.

On the other hand, when the rotor 20 rotates in the reverse direction, as shown in FIG. 3B, air is guided to the reverse braid 22B and flows into the reverse heat dissipation hole 24B. This is because the reverse braid 22B is bent at an angle of inclination toward the reverse direction, so that when the reverse braid 22B rotates in the reverse direction, air collides with the reverse braid 22B and then goes to the reverse heat radiating hole 24B. Inflow occurs. Accordingly, air is introduced into the motor through the reverse heat dissipation hole 24B by the reverse braid 22B.

As such, when the rotor 20 rotates in the forward direction, air inside the motor is discharged to the outside through the forward heat radiating hole 24A by the forward braid 22A, and when the rotor 20 rotates in the reverse direction. As the outside air flows into the inside through the reverse heat dissipation hole 24B by the reverse braid 22B, the cooling efficiency of the inside of the motor is increased.

That is, even if the rotor 20 rotates in any direction (forward or reverse), the heat radiating action occurs by the respective braids 22A and 22B, thereby improving the cooling efficiency of the motor.

If the forward braid 22A is bent in the reverse direction and the reverse braid 22B is bent in the forward direction, air is introduced into the motor by the reverse braid 22B during the forward rotation of the rotor 20. In the reverse rotation of the rotor 20, air is discharged to the outside of the motor by the forward braid 22A.

In the radiator of the rotor for an outer rotor type motor according to the present invention, a plurality of radiators comprising a forward braid and a reverse braid are formed radially on the rotor. According to the present invention, the forward braid and the reverse braid are formed on one side of the rotor. Since it is bent to be inclined to face different directions from the other side and the other side, the air around the rotor smoothly moves through the forward heat sink or the reverse heat sink by the forward braid or the reverse braid no matter which direction the rotor rotates. Therefore, the cooling efficiency of the motor is improved.

While the invention has been shown and described with respect to specific preferred embodiments thereof, the invention is not limited to the embodiments described above, and is commonly used in the art to which the invention pertains without departing from the spirit of the invention as claimed in the claims. Anyone with knowledge will be able to make various variations.

Claims (2)

In the rotor for the outer rotor type motor, A plurality of radiators 22 are provided radially with respect to the center of the rotor 20 to induce heat radiation by moving air during the rotation of the rotor 20, The heat dissipation unit 22, A portion of the forward heat dissipation hole 24A formed in the rotor 20 is bent and extended to one side of the rotor 20 to move air to the forward heat dissipation hole 24A during the forward rotation of the rotor 20. Forward braid 22A; And A part of the reverse heat dissipation hole 24B formed in the rotor 20 is bent and extended to the other side of the rotor 20 so as to face the opposite direction to the forward braid 22A, so that the rotor 20 rotates in the reverse direction. A reverse braid 22B for moving air to the reverse heat dissipation hole 24B; Heat dissipation device of the rotor for the outer rotor type motor comprising a. The heat radiator of claim 1, wherein the forward braid and the reverse braid are bent at an inclined angle with respect to the rotor 20.

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