KR20170068641A

KR20170068641A - Electric motor

Info

Publication number: KR20170068641A
Application number: KR1020150174669A
Authority: KR
Inventors: 최장운; 김완기; 김근웅; 김승연
Original assignee: 현대일렉트릭앤에너지시스템(주)
Priority date: 2015-12-09
Filing date: 2015-12-09
Publication date: 2017-06-20
Also published as: KR102056238B1

Abstract

The motor includes a motor body having a plurality of radiating fins protruded along a circumference of an outer circumferential surface of the motor, an end shield disposed at one side of the motor body, And a guide part formed in the end shield and converting the fluid introduced through the cooling fan into a rectilinear component and guiding the fluid to the radiating fins of the motor body. With this configuration, the effect of improving the cooling efficiency can be obtained by converting the fluid introduced by the cooling fan into the rectilinear component.

Description

ELECTRIC MOTOR

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric motor, and more particularly, to an electric motor having improved cooling performance.

Generally, the motor has a structure in which it is rotated by the interaction between the coil part and the permanent magnet. Here, since a current flows in the coil portion, considerable heat is generated. Such heat may increase the internal temperature of the motor, which may degrade the performance of the motor or may cause malfunctions. For example, if the internal temperature of the motor is outside the range of the temperature rise standard, insulation breakdown may occur inside the motor or there may be a change in the material of the component. Therefore, a plurality of heat dissipating fins are formed on the outer surface of the electric motor to effectively dissipate heat therein.

Since the cooling structure using the radiating fins cools the motor only by the temperature of the surrounding air, the cooling efficiency of the motor is lowered. Therefore, most of the motors are equipped with cooling fans. The cooling fan is mounted on the motor rotation shaft and blows cool air to the radiating fins to cool the motor.

However, when cooling is performed using a cooling fan, there is a problem that the cooling performance is remarkably lowered because the cooling fan rotates and the external fluid flows, and the fluid does not flow to the rear end of the radiating fin due to the flow of the fluid.

It is an object of the present invention to provide an electric motor capable of improving the cooling efficiency by converting an inflow fluid into a rectilinear component and supplying it to the radiating fin.

According to an aspect of the present invention, there is provided an electric motor including: a motor body having a plurality of radiating fins protruding from a periphery of an outer circumferential surface thereof; An end shield disposed at one side of the electric motor body; A cooling fan mounted on the motor body and disposed behind the end shield; And a guide portion formed in the end shield and configured to convert a fluid introduced through the cooling fan into a rectilinear component and guide the fluid to a radiating fin of the motor body.

The guide portion may include a plurality of diaphragms provided along the periphery of the end shield, and the plurality of diaphragms may be formed to have the same height as the radiating fins formed on the outer peripheral surface of the motor body.

The guide portion may be disposed such that any one of the plurality of diaphragms is in line with any one of the plurality of the heat radiating fins.

The guide portion may include an upper diaphragm protruded above the end shield to guide the fluid to an upper portion of the motor body, Side diaphragms protruding from both sides of the end shield to guide the fluid to the side of the motor body; And a lower diaphragm protruded to a lower side of the end shield and guiding the fluid to a lower portion of the motor body.

Further, the guide portion may be formed such that one side of the upper diaphragm and the side diaphragm protrude from the surface of the end shield toward the cooling fan.

In addition, in the guide portion, the interval between the lower diaphragms is the same as the interval between the heat radiating fins of the electric motor body, the interval between the side diaphragms is larger than the interval between the lower diaphragms, May be arranged larger than the interval between the diaphragms.

According to the motor of the present invention, the effect of improving the cooling efficiency can be obtained by converting the fluid introduced by the cooling fan into the rectilinear component.

1 is a perspective view schematically showing an electric motor according to an embodiment of the present invention,
FIG. 2 is a perspective view schematically showing an essential part of an electric motor according to an embodiment of the present invention,
FIG. 3 is a schematic view showing a state of a fluid flowing through a conventional motor and a radiating fin of an electric motor according to an embodiment of the present invention; FIG.
FIG. 4 is a view schematically showing a speed distribution of a fluid passing through a radiator fin of a motor according to a conventional motor and an embodiment of the present invention. FIG.

In order to facilitate understanding of the features of the present invention, the motor related to the embodiment of the present invention will be described in more detail.

It should be noted that, in order to facilitate understanding of the embodiments described below, reference numerals are added to the components of the accompanying drawings, so that the same components are denoted by the same reference numerals even though they are shown in different drawings . In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

Hereinafter, a specific embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a perspective view schematically showing an electric motor according to an embodiment of the present invention, and FIG. 2 is a perspective view schematically showing a main part extracted from the electric motor.

1 and 2, an electric motor 100 according to an embodiment of the present invention includes an electric motor body 110 having a plurality of heat dissipating fins 111 protruding from a periphery of the electric motor 100, A cooling fan 130 mounted on the motor body 110 and disposed behind the end shield 120 and a cooling fan 130 formed on the end shield 120 and disposed on the rear side of the end shield 120, And a guide unit 140 for converting the fluid introduced through the heat sink 130 into linear components and guiding the fluid to the heat radiating fins 111 of the motor body 110.

The electric motor 100 includes a driving shaft 112 for transmitting rotational power to an external device, a sub-shaft 113 for rotating the cooling fan 130, and a cooling fan cover 130 for protecting the cooling fan 130. [ (131).

The thus configured motor 100 may be used in connection with a backup auxiliary generator, a pump, an air compressor, and the like.

The electric motor body 110 may include a rotor (not shown) and a stator (not shown). For example, the permanent magnet may be mounted on the inner surface of the motor body 110 and may be provided as a stator, and the coil may be mounted on the driving shaft 112 and provided as a rotor. Of course, the arrangement of the permanent magnet and the coil is not limited to this, and the position of the permanent magnet and the coil may be changed depending on the type of the electric motor.

The end shield 120 is disposed so as to close one side of the motor body 110 and is inserted and disposed so that its center passes through and the auxiliary shaft 113 rotates.

The heat radiating fins 111 may be formed along a circumference of the outer circumferential surface of the motor body 110 and may extend along the longitudinal direction of the driving shaft 112.

The radiating fins 111 may be vertically arranged in the vertical direction of the electric motor body 110 by dividing the electric motor body 110 vertically and horizontally and horizontally in the left and right direction.

In addition, the radiating fins 111 may be formed at different heights. That is, the radiating fins 111 of the relatively high temperature portion of the motor body 110 are formed to be high, and the radiating fins of the relatively low temperature portion may be formed to be low.

The heat dissipation fins 111 are preferably made of a material having excellent thermal conductivity such as copper, aluminum, or the like. However, if necessary, the radiating fin 111 may be made of the same material as the motor body 110. In this case, the heat radiating fins 111 can be integrally formed with the motor body 110, thereby reducing manufacturing time and cost.

One end of the drive shaft 112 protrudes from the motor body 110 and a power is supplied to the motor 100 to rotate the drive shaft 112.

The auxiliary shaft 113 protrudes from one side of the electric motor body 110 and is rotatable in association with the driving shaft 112.

The cooling fan 130 is coupled to the auxiliary shaft 113 and rotates together with the rotation of the auxiliary shaft 113 to generate a fluid flow toward the electric motor body 110.

The cooling fan cover 131 is disposed on one side of the motor body 110 and encloses the cooling fan 130 so as to protect the cooling fan 130. The cooling fan cover 131 is formed with a plurality of ventilation holes to generate a fluid flow by the rotation of the cooling fan 130.

The guide part 140 is formed of a plurality of diaphragms provided along the periphery of the end shield 120 and the plurality of diaphragms are formed to have the same height as the heat radiating fins 111 formed on the outer peripheral surface of the motor body 110 . Of course, the diaphragm may be formed higher than the radiating fins 111.

Any one of the plurality of diaphragms may be disposed so as to be in line with any one of the plurality of the radiating fins 111. That is, the radiating fins 111 are formed in a straight line and are elongated in the longitudinal direction of the motor body 110, and the diaphragm is extended from the radiating fins 111 and flows through the cooling fan 130 And the fluid is converted into a straight component of the diaphragm and guided to the radiating fins (111).

The guide part 140 includes an upper diaphragm 141 protruding upward from the end shield 120 and guiding the fluid to the upper portion of the motor body 110 and an upper diaphragm 141 protruding from both sides of the end shield 120 A side diaphragm 142 for guiding the fluid to the side of the electric motor body 110 and a lower diaphragm 143 protruded to the lower side of the end shield 120 and guiding the fluid to the lower portion of the electric motor body 110, .

One side of the upper diaphragm 141 and the side diaphragm 142 may protrude from the surface of the end shield 120 toward the cooling fan 130. This is effective in increasing the flow path length of the fluid and enhancing the conversion performance of the fluid into the linear component.

However, it is preferable that the lower diaphragm 143 does not protrude from the surface of the end shield 120. This is because the upper diaphragm 141 and the side diaphragm 142 protruding from the surface of the end shield 120 act as a resistance against the flow of the fluid so that a small amount of flow is supplied to the lower portion. Preferably, the lower diaphragm 143 is formed so as not to protrude from the surface of the end shield 120.

The flow rate between the lower side radiating fins 111 and the lower side radiating fins 111 is larger than that between the lower side radiating fins 111 and the lower side radiating fins 111. In general, when the electric motor is installed on the floor and the flow rate between the radiating fins 111 is measured, Relatively low.

The guide device of the present invention increases the flow straightness of the fluid introduced by the cooling fan 130, but may act as a flow resistance, so that the spacing between the diaphragms is an important design factor. The upper radiating fins 111 of the electric motor body 110 are caused not only by the forced convection but also by the natural convection due to the flow generated by the cooling fan 130, So that the interval between the upper diaphragms 141 is larger than the interval between diaphragms at other positions.

In the case of the side portion of the electric motor body 110, if the actual flow velocity is measured, the flow velocity of the upper portion is similar to that of the average velocity but an irregular flow velocity is generated with time. Therefore, the interval of the side diaphragms 142 It is preferable to arrange it in a smaller size.

Further, in the case of the lower portion of the electric motor body 110, a flow path through which the ascending air current can pass can not be ensured, a large amount of flow must flow between the radiating fins 111, and the flow of the rectilinear component must be secured. 142 and the lower diaphragm 143 of the number equal to the number of the lower heat-dissipating fins 111 of the electric motor body 110 are formed.

The lower diaphragm 143 is formed in a number equal to the number of the lower radiating fins 111 of the electric motor body 110 and the gap between the lower diaphragms 143 is formed between the radiating fins 111 of the electric motor body 110 The spacing between the side diaphragms 142 is greater than the spacing between the lower diaphragms 143 and the spacing between the upper diaphragms 141 is greater than the spacing between the side diaphragms 142 .

With this configuration, the motor according to the embodiment of the present invention includes a plurality of diaphragms formed on the end shield disposed at one side of the motor body, converting the fluid flowing through the cooling fan into linear components, and guiding the fluid to the radiating fins of the motor body The cooling efficiency can be improved.

In order to confirm the improved cooling effect of the motor according to the embodiment of the present invention, FIGS. 3 and 4 show the flow of the cooling fluid of the conventional motor and the motor according to the embodiment of the present invention.

FIG. 3 and FIG. 4 are views schematically showing a fluid flow state and a velocity distribution of a fluid passing through a radiator fin of a motor according to a conventional motor and an embodiment of the present invention.

3 and 4, FIG. 3 (a) shows a fluid flowing state in which the fluid introduced by the cooling fan flows toward the motor body in a conventional motor in which no diaphragm is formed, The phenomenon that the fluid flows unevenly can be confirmed. 3 (b) shows the flow of fluid through the body of the electric motor of the present invention. It can be seen that the fluid flows uniformly along the flow path of the heat radiating fin of the electric motor body.

4 (a) shows the speed distribution of the fluid that has flowed through the motor body by the fluid introduced by the cooling fan in the conventional motor in which the diaphragm is not formed. The velocity of the fluid passing through the upper and the side of the motor body It can be confirmed that the distribution is uneven. 4 (b) shows the velocity distribution of the fluid passing through the motor body of the present invention. It can be seen that the fluid uniformly flows along the flow path of the heat radiating fin of the motor body, have.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It is to be understood that various changes and modifications may be made without departing from the scope of the appended claims.

100: electric motor 110: electric motor body
111: heat radiating fin 112: drive shaft
113: auxiliary shaft 120: end shield
130: cooling fan 131: cooling fan cover
140: guide portion 141: upper diaphragm
142: side diaphragm 143: lower diaphragm

Claims

An electric motor body having a plurality of radiating fins protruded along the periphery of the outer circumferential surface;
An end shield disposed at one side of the electric motor body;
A cooling fan mounted on the motor body and disposed behind the end shield; And
A guiding part formed on the end shield for guiding the fluid introduced through the cooling fan to a linear component and guiding the fluid to the radiating fins of the motor body;
&Lt; / RTI >

The method according to claim 1,
The guide portion
And a plurality of diaphragms provided along the circumference of the end shield, wherein the plurality of diaphragms are formed to have the same height as the heat radiating fins formed on the outer circumferential surface of the motor body.

3. The method of claim 2,
The guide portion
Wherein one of the plurality of diaphragms is arranged so as to form a straight line with any one of the plurality of the radiating fins.

The method of claim 3,
The guide portion
An upper diaphragm protruded above the end shield to guide the fluid to the upper portion of the motor body;
Side diaphragms protruding from both sides of the end shield to guide the fluid to the side of the motor body; And
A lower diaphragm protruded to a lower side of the end shield and guiding the fluid to a lower portion of the motor body;
And an electric motor.

5. The method of claim 4,
The guide portion
And one side of the upper diaphragm and the side diaphragm protrude from the surface of the end shield in the direction of the cooling fan.

5. The method of claim 4,
The guide portion
Wherein a distance between the lower diaphragms is equal to a distance between the heat dissipating fins of the motor body and an interval between the side diaphragms is larger than an interval between the lower diaphragms and an interval between the upper diaphragms is larger than an interval between the side diaphragms .