KR100666437B1 - Rotor of moter - Google Patents

Abstract

A rotor of a high speed motor is provided to easily cool the inside of a housing by flowing air in a lengthwise direction through a spiral impeller formed on the circumferential surface of a core. A rotor of a high speed motor includes a motor shaft(11a), a core(11b), a coil wire, two impeller fixing bodies(11d), and a plurality of impellers(11e). The coil wire is wound around the core(11b) which is fixedly installed on the motor shaft(11a). Two impeller fixing bodies(11d) warp both ends of the core(11b). The plurality of impellers(11e) are formed to be apart from each other between the two impeller fixing bodies(11d). The impellers(11e) are protrudedly formed to have a screw shape on an outer plane of the core(11b). The impeller fixing bodies(11d) and the impellers(11e) are integratedly formed on the motor shaft(11a) and the core(11b) wound by the coil wire through the insert molding.

Description

Rotor of high speed motor

1 is a perspective view showing an example of a handpiece to which a rotor of a high speed motor according to the present invention is applied;

2 is an exploded perspective view of FIG. 1;

3 is a cross-sectional view showing an example of a motor showing a rotor of a high speed motor according to the present invention;

4 is a cross-sectional view taken along the line A-A of FIG.

5 is a cross-sectional view of a motor illustrating another example of a rotor of a high speed motor according to the present invention;

6 and 7 are cross-sectional views and perspective views showing a rotor of a motor according to the related art.

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

1: motor 11: rotor

11a: motor shaft 11b: core

11c: coil wire 11d: impeller fixed body

11e: impeller

The present invention relates to a rotor of a high speed motor, and more particularly, to a high speed motor that improves the structure of the rotor to easily cool the inside of the motor with air and to smoothly flow the air to easily reduce noise. Relates to the rotor.

In general, a motor is composed of a rotor and a stator, and is used in an electric device that requires rotational force by rotating the rotor under electric supply. For example, a high-speed motor is installed inside a hand piece to facilitate a worker's work. Let's do it.

As an example, a motor is provided with a stator on an inner surface of the motor housing, a rotor is disposed between the stators, and a terminal installation tool is installed on one side of the motor housing, the terminal being coupled to a terminal for applying electricity to the rotor. On the other side of the motor housing has a structure in which the motor shaft located in the center of rotation of the rotor protrudes.

Here, since the rotor rotates at a high speed, a lot of heat is generated inside the housing, and thus, as shown in FIGS. 6 and 7, an impeller (one end) of the core 102 which is a component of the rotor 101 is conventionally used. 103 is integrally bonded, and thus the impeller 103 is rotated together with the rotor 101 to cool the inside of the housing 104.

That is, as the impeller 103 is rotated together with the rotor 101, outside air flows into the interior of the housing 104, and the introduced air flows out through the through holes 104a formed at both ends of the housing 104. The inside of the housing 104 is cooled by the air flowing out and circulated inside the housing by the impeller 103.

However, since the air flowing by the rotational force of the impeller flows outward from the center of the impeller, the air moves to the outside through a hole close to the circumference of the impeller, thereby cooling the space around the impeller but not cooling the inside of the housing as a whole. There are disadvantages.

In addition, since the through hole is formed at a position coincident with the circumferential surface of the impeller in order to move the air from the inside to the outside of the housing, there is a disadvantage in that a rapid vortex is generated between the impeller and the through hole to generate noise.

Of course, if the through-hole is not formed in the housing, the occurrence of noise can be reduced, but the impeller does not smoothly transport the air therein, and there is a disadvantage in that the inside of the housing cannot be cooled due to a lot of air circulated therein.

In particular, since the process of manufacturing the rotor is additionally generated due to the operation of attaching the impeller, the production time and the unit cost due to the manufacturing process are increased.

In addition, since the rotation speed of the motor is about 50000 rpm in the case of the motor installed in the dental handpiece, the heat generated from the motor of the handpiece is generated when the handpiece is held by the worker because the heat of the conventional motor cannot be cooled. It is delivered to the hand of a dentist and can give discomfort and anxiety as well as create anxiety in the patient due to noise.

The present invention has been made to solve the problems of the prior art as described above, the object of the present invention is to improve the structure of the impeller formed on the rotor, and also to simplify the manufacturing process of the impeller to facilitate the inside of the motor by air It is to provide a rotor of a high-speed motor that can cool the air and smooth the flow of air to reduce the noise and can easily reduce the manufacturing time of the product.

In order to realize this, the present invention, in the rotor consisting of rotating in the housing of the motor, after winding the coil wire to the core fixedly installed on the motor shaft, forming two impeller fixed body surrounding both ends of the core In addition, it is composed of a plurality of impeller integrally spaced apart between the two impeller stationary body, the impeller provides a rotor of a high-speed motor consisting of protruding in a spiral shape on the outer surface of the core.

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

1 and 2 are diagrams showing an example of a motor 1 used in a hand piece which is a transmission mechanism to which the rotor of the high speed motor according to the present invention is applied. The rotor 11 of the present invention is a housing 12. It is rotatably installed on the inner surface of the structure is rotated in the interior of the housing 12 by the electricity applied from the terminal installation member 13 is installed at one end of the housing (12).

Here, the rotor 11 according to the present invention winds the coil wire 11c around the core 11b fixedly mounted on the motor shaft 11a as shown in Figs.

In the present invention, in the core (11b) and the motor shaft (11a) in which the coil wire (11c) is wound, forming two impeller fixing bodies (11d) surrounding both ends of the core (11b) and two impeller height A plurality of impellers 11e are formed integrally spaced apart between the bodies 11d.

In particular, in order to allow air to flow in the longitudinal direction of the core 11b, as shown in FIGS. 2 to 4, the impeller 11e is formed in a spiral shape on the outer surface of the core 11b and protrudes outward in diameter. do.

Meanwhile, the impeller fixing body 11d and the impeller 11e may be attached to the core 11b. However, since the attaching process is very inferior in workability, in the present invention, the coil 11c is wound around the core 11b. And the impeller stationary body 11d and the impeller 11e are integrally formed by insert molding on the motor shaft 11a.

Then, by wrapping the coil wire 11c protruding at both ends of the core 11b by the impeller fixing body 11d, the coil wire 11c can be efficiently protected, and the molding of the insert into the mold reduces the production time. .

Here, even if the impeller 11e is formed by insert molding, since the material of the core 11b and the impeller 11e is different, the impeller 11e cannot be attached to the circumferential surface of the core 11b.

That is, when the rotor 11 having the impeller 11e is installed in the housing 12 and all the motors are assembled, the driving and stopping of the motor is repeated, and the impeller 11e is rotated by the rotor 11. If the repeated deformation occurs due to the rotation and fixation of the impeller (11e) will be damaged due to the fatigue stress.

Therefore, in the present invention, in consideration of the life of the impeller 11e, as shown in Figure 5 to form a spiral groove 11bb in the longitudinal direction on the outer surface of the core (11b) and a plurality of grooves (11bb) ) Is formed side by side on the circumferential surface of the core (11b) side by side, and then the impeller fixing body (11d) and the impeller (11e) is formed by insert molding, the lower part of the impeller (11e) is a groove of the core (11b) It includes a structure inserted into 11bb.

That is, the core 11b is formed with a plurality of grooves 11bb for winding the coil as in the prior art, and the lower part of the impeller 11e is inserted into the grooves 11bb, so that the impeller 11e into the mold. ) Is formed at the same position as the groove 11bb of the core 11b, the synthetic resin is filled in the groove 11bb and cooled to fix the position of the impeller 11e on the core 11b.

Of course, in the rotor 11 of the present invention, the terminal 11f is installed on the motor shaft 11a as in the prior art, and the stator 14 close to the circumferential surface of the rotor 11 has an interior of the housing 12. It is formed on the side.

The rotor of the high speed motor according to the present invention thus formed acts as follows.

The stator 14 is installed inside the housing 12, the rotor 11 is rotatably installed, and the terminal mounting member 13 is installed at one end of the housing 12. 1) In the assembled state, when the rotor 11 is rotated by applying electricity, the impeller 11e is rotated together with the motor shaft 11a and the core 11b to force the air in the longitudinal direction inside the housing. do.

Then, since the housing 12 of the motor 11 is not normally completely sealed, the ventilation hole 13a formed in the gap and the terminal installation member 13 generated by the processing error at one end of the housing 12 is not. Inflow to the outlet through the gap generated by the processing error at the other end of the housing 12 to cool the housing 12 as a whole.

In particular, the air flow is smooth and the friction noise generated around the impeller is not generated.

As described above, the rotor of the high speed motor according to the present invention smoothly flows air and cools the inside of the housing as a whole.

As described above, the rotor of the high-speed motor according to the present invention has a spiral impeller formed in the longitudinal direction on the circumferential surface of the core so that air flows in the longitudinal direction from the inside of the housing to easily cool the entire inside of the housing, It can smoothly reduce the noise by smoothing the flow of the impeller, and the impeller fixture and the impeller are formed around the motor shaft and the core by insert molding. There is this.

In addition, the motor installed in the dental handpiece operates at a speed of about 50000 rpm, but since it efficiently cools the heat inside the motor, heat is not transmitted to the dentist's hands, which does not create discomfort and anxiety. The occurrence of noise is greatly reduced, reducing the anxiety of the patient.

Claims (3)

In a rotor consisting of rotating inside a housing of a motor, The coil wire 11c is wound around the core 11b fixedly installed on the motor shaft 11a, and then two impeller fixing bodies 11d are formed to surround both ends of the core 11b. Consists of forming a plurality of impellers 11e integrally spaced between the stagnation 11d, The impeller (11e) is a rotor of a high-speed motor consisting of protruding in a spiral form on the outer surface of the core (11b). The method of claim 1, A rotor of a high speed motor, characterized in that the impeller fixing body (11d) and the impeller (11e) are integrally formed by insert molding on the core (11b) on which the coil wire (11c) is wound and the motor shaft (11a). The method of claim 2, After forming a plurality of spiral grooves 11bb in the core 11b, the impeller fixing body 11d and the impeller 11e are formed by insert molding, and the lower part of the impeller 11e is formed in the core 11b. The rotor of the high speed motor comprising inserting into the groove 11bb of the.

Images