KR101961615B1 - Electric motors - Google Patents

Abstract

A stator core unit fixed to the housing to be disposed in an inner space of the housing, and a rotor unit including a driving magnet for generating a rotating force by an electromagnetic interaction between the stator core unit and the stator core unit And a cooling water flow path through which cooling water flows is formed in the housing.

Description

[0001]

The present invention relates to an electric motor.

Generally, an electric motor includes a stator having a coil wound thereon and a rotor rotated by an electromagnetic force of the coil.

In addition, the electric motor generates heat due to friction between air and various members during driving. Such a heat lowers the efficiency of the electric motor and shortens the service life of the product.

On the other hand, an AFPM (Axial Flux Permanent Magnet) motor is a type of electric motor, and generally refers to an electric motor in which the main magnetic flux flows parallel to the mechanical axis.

Such an AFPM motor mainly has permanent magnets in the rotor, and a stator in which a coil is wound around the bracket or the housing is disposed.

In addition, conventionally, air cooling type cooling methods for circulating and cooling air by the cooling method of the AFPM motor have been widely used. However, such air cooling type cooling method has a disadvantage in that cooling efficiency is low.

Korean Patent Publication No. 2009-0001045

An electric motor capable of improving the cooling efficiency is provided.

An electric motor according to an embodiment of the present invention includes a housing having an inner space, a stator core unit fixed to the housing so as to be disposed in an inner space of the housing, and an electric motor And a cooling water flow path through which cooling water flows may be formed in the housing.

The housing includes first and second housings assembled to form an internal space, the first and second housings including first and second base portions having a disk shape, first and second base portions extending from the first and second bases, Two extension portions may be provided.

The cooling water flow path may have a spiral shape in the first and second base portions.

Wherein the stator core unit includes a stator core formed by assembling a plurality of unit cores, and a coil wound around each of the plurality of unit cores, wherein the plurality of unit cores are fixed to the plurality of unit cores, Holes may be formed.

The housing may have a pinhole corresponding to the fixing hole, and the cooling water channel may be disposed radially inward and outward of the pinhole.

The rotor unit may have a circular plate shape and may include a rotor spider on at least one surface of which the driving magnet is installed along a circumferential direction and a rotating shaft rotated in conjunction with the rotor spider.

The cooling efficiency can be improved.

1 is a schematic sectional view showing an electric motor according to an embodiment of the present invention.
2 is a partially cutaway perspective view showing a housing and a stator core unit of an electric motor according to an embodiment of the present invention.
3 is an explanatory diagram for explaining a flow path provided in a housing of an electric motor according to an embodiment of the present invention.
4 is a perspective view showing a stator core unit of an electric motor according to an embodiment of the present invention.
5 is a perspective view showing a rotor unit of an electric motor according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. Further, the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art. The shape and size of elements in the drawings may be exaggerated for clarity.

FIG. 1 is a schematic sectional view showing an electric motor according to an embodiment of the present invention, FIG. 2 is a partial cutaway perspective view showing a housing and a stator core unit of an electric motor according to an embodiment of the present invention, FIG. 2 is an explanatory view for explaining a cooling water passage provided in a housing of an electric motor according to an embodiment of the present invention; FIG.

1 to 3, an electric motor 100 according to an embodiment of the present invention may include a housing 120, a stator core unit 140, and a rotor unit 160.

The housing 120 forms an outer surface of the electric motor 100 and may include a first housing 122 and a second housing 124 coupled to the first housing 122 to form an inner space.

A cooling water flow path 130 through which cooling water flows is formed in the housing 120. That is, the first and second housings 120 are formed with cooling water flow paths 130.

The structure of the first housing 122 and the second housing 124 are substantially the same as those of the first housing 122 and the second housing 124, 120 will be described in detail with reference to the second housing 124.

The first housing 122 may include a first base portion 122a having a substantially disk shape and a first extension portion 122b extending from the first base portion 122a.

On the other hand, the cooling water flow path 130 is formed to have a spiral shape in the first base portion 122a.

The first extended portion 122b has a substantially cylindrical shape and the stator core 142 of the stator core unit 140 is inserted into the inner space formed by the first extended portion 122b.

A shaft hole 122c is formed in the center of the first housing 122 to receive the rotation shaft 164 of the rotor unit 160. The rotation shaft 164 is installed to penetrate the first housing 122 and is connected to an external device.

The first housing 122 is formed with a pin hole 122d in which a fixing pin 146 for fixing the stator core 142 of the stator core unit 140 to be described later is installed.

As described above, the cooling water passage 130 for cooling the electric motor 100 may be provided on the base portion 122a of the first housing 122 so as to have a spiral shape in the circumferential direction.

Here, the term "circumferential direction" refers to the direction of rotation about the rotation axis 164 with reference to FIG. 1, and the "radial direction" refers to the leftward direction and the rightward direction with reference to FIG.

The cooling water flow path 130 is formed so as to be disposed radially inward and outward of the pinhole 122d. The cooling water can flow along the cooling water flow path 130 to cool the electric motor 100 as a whole and also to cool the stator core 142 of the stator core unit 140 fixedly installed in the extension part 122b. It is possible to effectively remove heat generated in the heat exchanger.

Here, the cooling water flow path 130 is provided in the circumferential direction around the insertion hole 122c of the first housing 122 so that the cooling water can rotate clockwise and counterclockwise inside the first housing 122 .

The first housing 122 may be provided with a cooling water outlet (not shown) connected to the cooling water flow path 130 and through which the cooling water circulated through the inlet port 132 and the cooling water flow path 130, through which the cooling water flows, is discharged.

That is, the cooling water inlet 132 is connected to a cooling water supply unit (not shown) separately provided by the hose to supply the cooling water to the inside of the first housing 122. The cooling water heated while circulating the cooling water channel 130 is cooled And can be discharged to the outside of the first housing 122 by the discharge port.

As a result, the electric motor 100 according to an embodiment of the present invention includes the cooling water flow path 130 passing through the inside of the first and second housings 122 and 124, The cooling water channel 130 may be formed to be opposed to the stator core unit 140 to effectively remove the heat generated by the stator core 142. [

The stator core unit 140 is fixed to the housing 120 so as to be disposed in the inner space of the housing 120. 4, the stator core unit 140 includes a stator core 142 in which a plurality of unit cores 142a are assembled, and a plurality of unit cores 142a, (Not shown).

On the other hand, the plurality of unit cores 142a are formed with fixing holes 142b through which the fixing pins 146 for fixing to the housing 120 pass.

A plurality of unit cores 142a may be assembled and the stator core 142 may have a ring shape as a whole.

The rotor unit 160 has a drive magnet 162 for generating a rotational force by an electromagnetic interaction with the stator core unit 140.

5, the rotor unit 160 may have a circular plate shape and may have a rotor spider 166 mounted on at least one side thereof along the circumferential direction of the drive magnet 162 have. The rotation shaft 164 described above is fixed to the rotor spider 166 and can be rotated in conjunction with the rotor spider 166.

The driving magnet 162 may include a first driving magnet 162a magnetized to the N pole and a second driving magnet 162b magnetized to the S pole. The first and second driving magnets 162a and 162b, Can be inserted and installed in the installation groove 166a formed in the rotor spider 166 alternately.

The rotation shaft 164 may be inserted into the shaft hole 122c of the first housing 122 to be supported by the bearing member 102 and may be connected to an external device to transmit power to the external device.

Here, various types of bearings may be used as the bearing member 102. For example, the bearing member 102 may be a ball bearing.

As described above, the cooling function can be performed when the electric motor 100 is driven through the cooling water flow path 130 passing through the inside of the first and second housings 122 and 124. More specifically, The flow path 130 can be formed to be opposed to the stator core unit 140 to effectively remove the heat generated in the stator core 142. [

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, but, on the contrary, It will be obvious to those of ordinary skill in the art.

100: Electric motor
120: Housing
140: stator core unit
160: Rotor unit

Claims (6)

A housing having an inner space;
A stator core unit fixed to the housing to be disposed in an inner space of the housing; And
A rotor unit having a drive magnet for generating a rotational force by an electromagnetic interaction with the stator core unit;
/ RTI >
The stator core unit
A stator core formed by assembling a plurality of unit cores; And
A coil wound around each of the plurality of unit cores;
And,
A cooling water flow path through which cooling water flows is formed in the housing,
The housing is composed of first and second housings assembled to form an internal space,
The first and second housings include first and second base portions having a disk shape and first and second extending portions extending from the first and second bases,
Wherein the cooling water flow path is formed in a spiral shape in the first and second base portions disposed adjacent to both ends of the stator core,
Wherein the cooling water passage is connected to an inlet through which cooling water flows and an outlet through which cooling water circulated through the cooling water passage is discharged.
delete delete The method according to claim 1,
Wherein the plurality of unit cores are provided with fixing holes through which fixing pins for fixing to the housing pass.
5. The method of claim 4,
A pinhole corresponding to the fixing hole is formed in the housing,
And the cooling water flow path is formed so as to be disposed on the inside and outside of the pin hole in the radial direction.
The rotor unit according to claim 1, wherein the rotor unit
A rotor spider having a circular plate shape, the rotor spider being installed on at least one side of the driving magnet along a circumferential direction; And
A rotating shaft that rotates in conjunction with the rotor spider;
.

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