KR19990002231U - Cooling structure of the motor - Google Patents

Abstract

The present invention relates to a cooling structure of an electric motor, a plurality of ribs protruding from the inner diameter surface of the frame toward the outer peripheral surface of the stator core so that the outer peripheral surface of the stator core can be spaced apart from the inner diameter surface of the frame, and a second end bracket. And a built-in fan mounted on a rotating shaft located between the rotor cores and one end of the rotating shaft located in the shaft hole of the first end bracket so that external cold air can be sucked into the frame by the rotation of the built-in fan. A plurality of holes drilled outwardly from the air intake grooves recessed and molded to the inner center of the rotating shaft on which the built-in fan is mounted, and the air intake grooves in the rotary shaft positioned between the built-in fan and the rotor core. The air passage hole and external cold air sucked from the air suction groove Since it includes a plurality of air discharge holes drilled on the first end bracket to be discharged to the outside after performing the negative cooling function, it is possible to maximize the cooling efficiency of the motor, as well as miniaturization of the product and There is an excellent effect that can bring down the weight.

Description

Cooling structure of the motor

The present invention relates to a cooling structure of an electric motor, and in particular, the outside cold air is sucked through the air intake groove and the air passage hole of the rotating shaft, and then cooled in the whole of various parts including the rotor core and stator core embedded in the frame. It relates to a cooling structure of the motor that can further maximize the cooling efficiency of the motor by improving the cooling structure to perform the function.

A cooling structure of a general electric motor will be described with reference to FIGS. 1 and 2 as follows.

1 is a front view including a half-section showing a motor with a cooling structure according to the prior art, Figure 2 is a side view showing a motor with a cooling structure according to the prior art, reference numeral 900 in the drawing is a terminal box for supplying power Instruct.

As shown in FIGS. 1 and 2, the cooling structure of the motor according to the prior art includes a frame 30 having a stator core 10 and a rotor core 20, a shaft hole 41 in the center thereof, and ( 51 and the bearing grooves 42 and 52 are formed at the same time, the first and second end brackets 40 and 50 coupled to both ends of the frame 30 and the rotor core 20. Bearing 60 mounted on the bearing grooves 42 and 52 while being fitted into the shaft holes 41 and 51 of the first and second end brackets 40 and 50. External fan 80, which is mounted to one end of the rotating shaft 70 is supported by a) and the rotating shaft 70 protruded outwardly to the outside of the first end bracket 40 to generate a cooling wind (冷却 風) And a fan cover 90 which is formed on the first end bracket 40 and protects the external fan 80 at the same time as the fan and the air inlet 91 and the air outlet 92 are formed. .

In this case, a plurality of cooling pieces 31 are radially protruded on the outer circumferential surface of the frame 30, and a cover part 32 is integrally formed on the outermost surfaces of the plurality of cooling pieces 31 to form an air passage 33. ) Will be provided.

Referring to Figure 3 the operation and action of the cooling structure of the electric motor according to the prior art made of the above configuration as follows.

3 is an installation diagram showing a state of use of a general electric motor.

First, when power is applied to the motor through the terminal box 900, the rotating shaft 70 is rotated, at this time, the external fan 80 mounted on one end of the rotating shaft 70 outside the first end bracket 40 ) Is also rotated together to suck the outside air through the inlet 91 of the fan cover 90 and then discharged through the outlet 92.

At this time, when the external cold air is sucked through the inlet 91 of the fan cover 90 by the rotation of the external fan 80 according to the driving of the electric motor, and then is discharged through the outlet 92, the cold cooling is performed. The wind is discharged to the outside via the air passage 33 of the frame 30 communicated with the discharge port 92 as shown by the arrow shown in Figure 1 to discharge the internal heat generated when the motor is driven.

Here, the cooling wind discharged to the outside via the air passage 33 of the frame 30, the air passage between the cooling piece 31 of the frame 30 to dissipate the heat generated when the electric motor is driven. (33) Perform a predetermined cooling function in direct contact with the surface.

By the way, the cooling structure of the motor according to the prior art is predetermined cooling only by the cooling wind passing while the internal heat generated when the motor is driven is in surface contact with the air passage between the cooling piece and the cover portion protruding to the outer peripheral surface of the frame. Due to the action, substantially no heat generated from the rotor core and the stator core can be cooled, but only the heat transferred to the surface of the frame can be cooled, thereby limiting the problem of increasing the cooling efficiency of the motor. there was.

In addition, since the external fan mounted at one end of the rotary shaft is located outside the first end bracket, a fan cover for protecting the external fan must be separately provided, which has a disadvantage in that it is counteract in miniaturization and light weight of the electric motor.

Therefore, the present invention has been devised to solve the above problems, and its purpose is to apply external cold air to various parts including the rotor core and stator core embedded in the frame to perform a predetermined cooling function. It is to provide a cooling structure of the motor that can maximize the cooling efficiency of the motor by forming an air intake groove and an air passage hole on the rotating shaft and equipped with a built-in fan and at the same time reduce the size and weight of the product.

1 is a front view including a half section showing an electric motor to which a cooling structure according to the prior art is applied.

Figure 2 is a side view showing an electric motor to which the cooling structure according to the prior art is applied

3 is a half sectional view showing an electric motor to which a cooling structure is applied according to the present invention;

FIG. 4 is a sectional view showing the principal parts of the frame of section A indicated in FIG. 3; FIG.

Explanation of symbols on the main parts of the drawings

100: stator core 200: rotor core

300: frame 310: rib

400: first end bracket 410 510: shaft hole

420,520: Bearing groove 430: Air exhaust hole

500: second end bracket 600: bearing

700: rotating shaft 710: air suction groove

720: air passage hole 800: built-in fan

The cooling structure of the motor according to the present invention for achieving the above object, the frame having a stator core, the shaft hole is formed in the center and the first and second end brackets coupled to both ends of the frame, the rotor core A cooling structure of an electric motor including a rotating shaft press-fitted into a shaft hole of the first and second end brackets, wherein the outer circumferential surface of the stator core can be spaced apart from the inner diameter surface of the frame. A plurality of ribs protruded toward the outer circumferential surface of the stator core, a built-in fan mounted on the rotating shaft positioned between the second end bracket and the rotor core, and external cold air is formed by the rotation of the built-in fan. From one end of the rotating shaft located in the shaft hole of the first end bracket to be sucked into the interior of the A plurality of air drilled outwardly from the air suction groove recessed to the inner center of the rotary shaft to which the built-in fan is mounted, and the air intake groove in the rotary shaft located between the built-in fan and the rotor core And a passage hole and a plurality of air discharge holes drilled on the first end bracket so that external cold air sucked from the air suction groove can be discharged to the outside after performing a cooling function inside the motor.

Hereinafter, a preferred embodiment of the cooling structure of the electric motor according to the present invention will be described with reference to FIGS. 3 and 4.

FIG. 3 is a half sectional view showing an electric motor to which a cooling structure according to the present invention is applied, and FIG. 4 is a sectional view showing main parts of a frame of section A indicated in FIG.

As shown in FIGS. 3 and 4, the cooling structure of the motor according to the present invention includes a frame 300 in which a stator core 100 and a rotor core 200 are embedded, and a shaft hole 410 in a central portion thereof. 510 is formed and at the same time bearing grooves 420 and 520 are formed, respectively, and the first and second end brackets 400 and 500 coupled to both ends of the frame 300 and the rotor core ( A bearing mounted in the bearing grooves 420 and 520 while being inserted into the shaft holes 410 and 510 of the first and second end brackets 400 and 500. It consists of a rotating shaft 700 supported by 600.

In this case, a plurality of ribs 310 protrude from the inner diameter surface of the frame 300 in the direction of the outer circumferential surface of the stator core 100 so that the outer circumferential surface of the stator core 100 is spaced apart from the inner diameter surface of the frame 300. It is configured to be, the rotation shaft 700 is located between the second end bracket 500 and the rotor core 200 has a built-in fan 800 is mounted.

In addition, the rotary shaft 700 is located in the shaft hole 410 of the first end bracket 400 so that external cold air can be sucked into the frame 300 by the rotation of the internal fan 800. The air intake groove 710 recessed and molded from one end of the rotating shaft 700 to the inner center of the rotating shaft 700 on which the built-in fan 800 is mounted, and the built-in fan 800 and the rotor core ( It consists of a plurality of air passage holes 720 which are bored to communicate in an outward direction from the air intake groove 710 in the rotating shaft 700 located between the 200.

In addition, a plurality of air discharge holes 430 are provided on the first end bracket 400 to allow the external cold air sucked from the air suction groove 710 to be discharged to the outside after performing a cooling function inside the motor. It is constructed through.

Referring to the operation and action of the cooling structure of the electric motor according to the present invention made of the above configuration as follows.

When power is applied to the motor through the terminal box, the rotating shaft 700 rotates. At this time, the built-in fan 800 mounted on the rotating shaft 700 inside the second end bracket 500 also rotates together. After sucking outside cold air through the air suction groove 710 and the air passage hole 720 of the 700, a part of the stator core 100 and the rotor core 200 as shown by the arrow direction shown in FIG. Direct cooling), and the other part of the inside of the motor via the gap between the stator core 100 and the rotor core 200 and the gap between the plurality of ribs 310 of the frame 300 After performing the overall cooling function is finally discharged with the heat inside through the air discharge hole 430 bored on the first end bracket 400.

According to the cooling structure of the electric motor according to the present invention as described above, after the external cold air is sucked through the air intake groove and the air passage hole of the rotary shaft of the various components including the rotor core and stator core built into the frame By constructing a structure that can perform the cooling function as a whole, not only can the cooling efficiency of the motor be maximized, but also the built-in fan is constructed inside the rotor core and the second end bracket, thereby miniaturizing the product. There is an excellent effect that can bring down the weight.

Claims (1)

A frame having a stator core, a shaft hole formed at a center thereof, and first and second end brackets coupled to both ends of the frame, and pressed into the rotor core and fitted into the shaft holes of the first and second end brackets. In the cooling structure of the electric motor including a rotating shaft, A plurality of ribs protruding from the inner diameter surface of the frame in the direction of the outer peripheral surface of the stator core so that the outer peripheral surface of the stator core can be spaced apart from the inner diameter surface of the frame; A built-in fan mounted to the rotating shaft located between the second end bracket and the rotor core, Recession molding from one end of the rotary shaft located in the shaft hole of the first end bracket to the inner center of the rotary shaft on which the internal fan is mounted so that external cold air can be sucked into the frame by the rotation of the internal fan. Air suction groove, A plurality of air passage holes drilled outwardly from the air suction grooves in the rotating shaft positioned between the built-in fan and the rotor core; The electric motor comprising a plurality of air discharge holes drilled on the first end bracket so that the external cold air sucked from the air suction groove can be discharged to the outside after performing the cooling function inside the motor. Cooling structure.