KR101066521B1 - Shaft connector for outer rotor type motor - Google Patents

Abstract

Disclosed is a shaft connecting structure of an outer rotor type motor, in which a shaft bushing connecting a rotor and a shaft is connected to the rotor in a simple process and stably assembled to prevent loss of rotational force while facilitating assembly of the rotor. According to the present invention, the shaft bushing mediated for transmitting the rotational force between the rotor and the rotating shaft is insert-molded at the center of the rotor to be coupled to the rotor, and a blade groove is formed at the bottom of the rotor to form the inside of the rotor. Blades for heat dissipation are respectively insert-molded, and the shaft bushing includes: a rotation hole in which serrations are formed to accumulate the shaft; Reinforcing ribs extending radially from an outer circumferential surface of the rotating hole; And an insert portion for insert molding the rotor while forming the bottom surface of the reinforcing rib, and provides a shaft connection structure of an outer rotor type motor having an insert attachment surface for forming the insert portion and the center portion of the rotor. . This makes it easy to manufacture the rotor of the outer rotor type motor and prevents the loss of rotational force, thereby improving the productivity and reliability of the motor.

Motor, outer rotor, bushing, insert,

Description

SHAFT CONNECTOR FOR OUTER ROTOR TYPE MOTOR}

1 is a perspective view of a conventional rotor.

Figure 2 is a cross-sectional view of the conventional rotor and the rotating shaft coupled state.

3 is a perspective view of a rotor according to the present invention.

Figure 4 is a cross-sectional view of the drive unit of the drum washing machine provided with the rotor of the present invention.

Fig. 5 is a sectional view of the main part of Fig. 4;

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

10: rotor 15: yoke part

17: blade groove 20: permanent magnet

25: combined boss 30: shaft bushing

31: Serration 32: Spinner

33: reinforcing rib 34: insert portion

40: blade

The present invention relates to a shaft coupling structure of an outer rotor type motor, and more particularly, to more stably and simply interconnect the shaft of the outer rotor type motor having the rotor rotating on the outer circumferential surface of the stator and to process the rotor. The present invention relates to a shaft connecting structure of an outer rotor-type motor that can easily prevent loss of rotational force.

Among the various motor starting methods, induction electromotive motors which are synchronized by induction electromotive force are a kind of rotational magnetic motor, which is a kind of AC motor in which rotational force is generated by interaction between the rotating magnetic field generated in the stator and the induction magnetic field generated in the rotor. .

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.

Among the motor types described above, an outer rotor type induction motor has recently been utilized 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 that a rotor composed of a drive shaft, a magnet, a rotor case, and the like rotates outside the stator composed of an iron core, a core, a base, and a bearing, that is, the rotor rotates around the stator.

The rotor of such an outer rotor type induction motor is shown in FIG. 1.

The rotor shown in FIG. 1 is a steel rotor (1) press-formed to form an exterior of a motor, a laminated iron core (2a) and a laminated iron core (2a) which are punched into the inner circumferential surface of the rotor (1) and forcibly pressed in. Rotor core (2) consisting of a ring-shaped ending member (2b) provided on the upper and lower surfaces of the), and a rotor bushing (3) for coupling the rotor (1) and a rotating shaft (not shown).

As such, the rotating rotor 1 is used with the rotor bushing 3 to transmit the rotational force to the axis of rotation, the combination of the rotor 1 and the rotor bushing 3 being shown in FIG. 2.

In FIG. 2, the rotor bushing 3 is fastened by a bolt 6 below after being laid out on the rotary shaft 4, and when the rotor bushing 3 is fastened, a fixing protrusion 7 formed on its outer circumferential surface or a separate The bolts 8 are fastened to each other in a manner that is coupled to the rotor 1.

However, in the structure of the rotor 1 as described above, the assembly process is difficult due to the press-fit of the rotor core 2 using the laminated iron core 2a and the ending member 2b, and the rotor bushing 3 and the rotor 1. By assembling the assembly by a separate bolt (6) a problem arises that the rotational force transmission between the rotor bushing (3) and the rotary shaft (4) is lost.

The present invention has been invented in view of the above problems, and an object of the present invention is to reliably assemble the shaft bushing connecting the rotor and the shaft to the rotor in a simple process to facilitate the assembly of the rotor while reducing the loss of rotational force. It is to provide a shaft connection structure of the outer rotor type motor that can be prevented.

In order to achieve the above object, the present invention, the rotating shaft is installed in the bearing housing, and a permanent magnet for magnetic action with the winding field of the stator is attached while rotating from the outside in a manner to accommodate the stator of the winding field A rotor of a drum washing machine comprising a rotor having a yoke surface and a shaft bushing for engaging the rotor and the rotating shaft, wherein the shaft bushing mediated for transmitting rotational force between the rotor and the rotating shaft is the rotor. The insert is molded in the center of the rotor and coupled to the rotor, a blade groove is formed in the bottom portion of the rotor is inserted into each of the blades for heat dissipating the inside of the rotor, the shaft bushing, the serration is formed so that the shaft is built up Formed rotating ball; Reinforcing ribs extending radially from an outer circumferential surface of the rotating hole; And an insert portion for insert molding the rotor while forming the bottom surface of the reinforcing rib, and provides a shaft connection structure of an outer rotor type motor having an insert attachment surface for forming the insert portion and the center portion of the rotor. .

According to the present invention, when the shaft bushings used for the connection between the rotor and the shaft outputting the rotational force of the motor are combined with the rotor, the process is simplified by press-fitting and insert injection, thereby simplifying the process and preventing the loss of the rotational force by increasing the tightening force. Has characteristics.

The rotor of the present invention having the above characteristics is shown in FIG. 3.

In FIG. 3, the rotor of the present invention has a rotary shaft 50 arranged in a bearing housing (not shown) in the center thereof, and the rotary shaft 50 is coupled to a shaft bushing 30 coupled to the rotor 10. The serration 31 is formed at the center of the shaft bushing 30 so that the rotation shaft 50 has a coupling force to prevent rotation loss.

On the other hand, the rotor 10 is rotated on the outside in a manner to accommodate the stator (not shown) of the winding field while the yoke surface 15 is attached to the permanent magnet 20 for magnetic action with the winding field of the stator Have

The shaft bushing 30 coupled to the rotor 10 is insert-molded at the center of the rotor 10 to be coupled to the rotor 10. The rotor (10) is formed by a coupling coupling force by insert molding of the shaft bushing 30. 10 and the shaft bushing 30 are completely combined to simplify the process.

In order to couple the shaft bushing 30 and the rotor 10 to each other, the shaft bushing 30 may include a rotation hole 32 in which a serration 31 is formed such that the shaft 50 is arranged therein, and the rotation ball 32. It includes a reinforcing rib 33 extending radially from the outer circumferential surface of the) and the insert portion 34 for insert-molding the rotor 10 while forming the bottom surface of the reinforcing rib 33.

In addition, an insert attaching surface 25 is formed at the center of the rotor 10 to be molded into the lower surface of the insert portion 34 at a corresponding position of the insert portion 34, and thus the insert portion 34 is formed. The insert attaching surface 25 is molded.

Meanwhile, according to the present invention, a blade groove 17 is formed in the bottom portion 18 of the rotor 10 in a long hole shape, and the blade groove 17 has a blade that radiates heat inside the rotor 10. 40 are each insert molded.

4 illustrates a state in which the rotor 10 having the shaft bushing 30 coupled thereto is used in the drum washing machine, and FIG. 5 is a cross-sectional view of the main part of FIG. 4.

The drum washing machine shown in FIG. 4 is not intended to limit the present invention, and as an embodiment of the motor installation unit of the drum washing machine in which the present invention can be installed, for example, the drum washing machine of the present embodiment is installed with an inclined drum. Regardless of the gist, it is well known that the rotor of the present invention can be applied even when the drum is installed horizontally, and various modified embodiments are possible.

The motor installation unit of the drum washing machine is installed at the rear of the cabinet 40 which forms the exterior of the washing machine, and the door 42 is installed at the front of the cabinet 40 to suspend laundry from the inside of the cabinet 40. It is possible to open and close so as to be introduced into the drum 44 and the tub 45 suspended by the ().                     

The drum 44 is rotatably installed inside the tub 45. The drum 44 is connected to a motor, and the rear end of the drum 44 is injection molded integrally with the shaft 50 of the motor. The rotational force of the motor is formed to be transmitted to the drum 44.

The shaft 50 connected to the drum 44 is supported at both ends by a bearing 53 installed inside the bearing housing 52, and an end of the bearing housing 52 is separated from the installation of the motor by a base plate ( 54) is installed.

The base plate 54 is installed in such a manner as to surround the outside of the bearing housing 52 and the tub 45 of the motor. The base plate 54 serves to fix the bearing housing 52 of the motor to the tub. While being installed to protect the outer surface of the tub 45, in particular serves to separate the motor installed to one side of the base plate 54 and the tub 45.

In the base plate 54, the stator 57 of the motor is fixed to the base plate 54 in a predetermined fixing manner, and the stator 57 is installed to perform magnetic action by a predetermined field winding.

In addition, the rotor 10 of the present invention installed in such a manner as to accommodate the stator 57 is installed to surround the stator 57 in a cylindrical shape while the permanent magnet 20 is attached to the inner surface of the stator 57. ) And self-action.

As shown in FIG. 5, the rotor 10 includes a bottom portion 18 forming a cylindrical bottom and a yoke surface 15 forming an upstanding outer surface, and a bottom portion of the rotor 10. (18) The insert surface 34 of the shaft bushing 30 is molded and integrally coupled to the insert attaching surface 25 formed at the center.

In addition, the blade 40 is integrally molded and coupled to the blade groove 17 formed on the bottom 18 of the rotor 10 to dissipate the interior when the rotor 10 is rotated.

In addition, the shaft bushing 30 has a reinforcing rib 33 formed at the periphery of the rotating hole 32 to prevent the twist of the shaft bushing 30 due to the rotational force of the rotating hole 32.

Thus, the shaft bushing 30 is integrally processed in the rotor 10, so that the shaft bushing 30 connects the shaft 50 and the rotor 10 so that the rotational force of the rotor 10 is transmitted to the shaft 50. Be sure to

By the motor provided with the rotor 10 of the present invention configured as described above, the permanent magnet in the yoke surface 15 on the inner surface of the rotor 10 of the present invention so as to act magnetically with the stator 57 when the washing machine is operated. 20 is attached and magnetically interacts with the rotor 10, whereby the rotor 10 rotates with a predetermined rotational force to transmit rotational force to the shaft bushing 30 integrally attached to the rotor 10. Done.

Thus, the rotational force transmitted to the shaft bushing 30 is axially supported by the bearing 53 supported inside the bearing housing 52 to rotate so that the drum 44 integrally molded with the shaft 50 rotates. The washing is performed.

Thus, in the present invention, the blade 40 is simultaneously molded and molded while inserting the lower and side yoke surfaces 15 and the shaft bushings 30 of the rotor 10 rotating in the motor of the drum washing machine into the rotor ( 10) will be easy to process.

 By the shaft connection structure of the outer rotor type motor of the present invention, the rotor manufacturing of the outer rotor type motor is easy, and the loss of rotational force is prevented, thereby improving the productivity and reliability of the motor.

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 (3)

Permanent magnet 20 for magnetic action with the winding field of the stator 57 while rotating from the outside in a manner that accommodates the rotary shaft 50 and the stator 57 of the winding field, which is built up in the bearing housing 12 In the rotor of the drum washing machine comprising a rotor (10) having a yoke surface (15) to which it is attached, and a shaft bushing (30) for engaging the rotor (10) with the rotating shaft (50). The shaft bushing 30 has a rotation hole 32 is formed with a serration 31 so that the rotary shaft 50 is built up; Reinforcing ribs (33) extending radially from the outer circumferential surface of the rotating hole (32); And an insert portion 34 for insert molding on the rotor 10 while forming a bottom surface of the reinforcing rib 33. An insert attaching surface 25 for forming with the insert portion 34 is formed in the center of the rotor 10, and a plurality of blade grooves 17 are formed in the outer bottom surface 18 of the insert attaching surface 25. Is formed, The shaft bushing 30 is insert-molded at the center of the rotor to be coupled with the rotor 10, The blade groove 17, the shaft connection structure of the outer rotor-type motor, characterized in that the insert inserting the blades 40 for radiating the inside of the rotor 10, respectively. delete delete

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