KR101864324B1 - Motor assembly - Google Patents

Abstract

The present invention discloses a motor assembly. The present invention relates to a stator comprising a stator, a rotor disposed inside the stator and rotating, a housing provided so as to surround the rotor and storing a coolant therein, and a first seal provided between the housing and the rotor .

Description

[0001]

The present invention relates to an assembly, and more particularly, to a motor assembly.

Generally, a motor assembly is provided with a stator and a rotor inside a case to generate rotational force by the electromagnetic force between the stator and the rotor. At this time, the motor assembly may be installed in various external devices to provide rotational force. Such a motor assembly may generate a lot of heat during operation.

Various methods can be used to remove such heat. For example, the temperature of the stator can be lowered by circulating the cooling water in the stator part, and the temperature of the rotor can be indirectly lowered by the circulating cooling water. Also, the temperature of the rotor can be lowered through circulation of air.

At this time, when the temperature is lowered by the circulation of cooling water and air as described above, the temperature of the stator can be easily lowered. On the other hand, in the case of the rotor, due to the air circulation or the indirect cooling through the cooling water, eddy current loss occurs due to the influence of the stator in the rotor, so that the temperature of the rotor is increased, which may affect the performance and lifetime of the motor assembly.

The general motor assembly as described above is specifically disclosed in Korean Patent Publication No. 1998-0041296 (entitled: Permanent Magnet Synchronous Motor, Applicant: Mando Machinery Co., Ltd.).

Korean Patent Publication No. 1998-0041296

Embodiments of the present invention provide a motor assembly capable of cooling a rotor.

One side of the rotor includes a stator, a rotor disposed inside the stator and rotating, a housing installed to surround the rotor and storing refrigerant therein, and a rotor disposed between the rotor and the housing. The motor assembly including the first sealing portion can be provided.

The housing includes a first housing spaced apart from a portion of an outer surface of the rotor and disposed to surround a part of the outer surface of the rotor, a second housing coupled with the first housing, And a sealing portion provided between at least two of the second housing and the rotor.

The first housing may have an insertion protrusion protruding toward the rotor, and the rotor may have an insertion groove into which the insertion protrusion is inserted.

Embodiments of the present invention can absorb the heat generated when the rotor rotates by arranging the coolant in the outer portion of the rotor, and can also discharge the heat to the outside to increase the lifetime of the rotor.

1 is a cross-sectional view illustrating a motor assembly according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing the coupling relationship between the rotor and the housing in FIG. 1;
3 is a cross-sectional view taken along the line III-III in Fig.
4 is a perspective view showing the housing shown in Fig.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. It is noted that the terms "comprises" and / or "comprising" used in the specification are intended to be inclusive in a manner similar to the components, steps, operations, and / Or additions. The terms first, second, etc. may be used to describe various elements, but the elements should not be limited by terms. Terms are used only for the purpose of distinguishing one component from another.

1 is a cross-sectional view illustrating a motor assembly 100 according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing the coupling relationship between the rotor 140 and the housing 150 in FIG. 3 is a cross-sectional view taken along the line III-III in Fig. 4 is a perspective view showing the housing 150 shown in FIG.

Referring to FIGS. 1 to 4, the motor assembly 100 may include a case 110 forming an outer appearance. At this time, a through hole may be formed in the case 110 so that the cooling water circulates therein. In addition, a plurality of cases 110 may be provided, and a plurality of cases 110 may be detachably coupled to each other. At this time, the plurality of cases 110 may be coupled to each other by a coupling member such as a bolt, a screw, or the like.

Meanwhile, the motor assembly 100 may include a stator 120 fixed to the inside of the case 110. At this time, the stator 120 may be formed in various shapes. For example, the stator 120 may have permanent magnets. The stator 120 may include a magnetic body 121 such as iron or the like and a coil portion 122 wound around the magnetic body 121. Hereinafter, the stator 120 includes a magnetic body 121 and a coil part 122 for convenience of explanation.

The motor assembly 100 may include a rotor 140 rotatably mounted within the stator 120. The rotor 140 may include a rotor body portion 141 into which the shaft 130 is inserted and a magnet portion 142 installed to be inserted into the rotor body portion 141. In particular, the magnet portion 142 may be formed by winding a general permanent magnet or a coil. Hereinafter, for convenience of explanation, the case where the magnet portion 142 includes a general permanent magnet will be described in detail.

A plurality of the magnet units 142 may be provided. At this time, the plurality of magnet parts 142 can be inserted into the outer body part of the rotor body part 141 with being separated from each other. The plurality of magnet portions 142 may be installed on the rotor body portion 141 while forming a certain angle with respect to the center of the rotor body portion 141.

The motor assembly 100 may include a housing 150 enclosing the rotor 140 and storing the refrigerant therein. The housing 150 may include a first housing 151 spaced from a portion of the outer surface of the rotor 140 and disposed to surround a portion of the outer surface of the rotor 140. In addition, the housing 150 may include a second housing 152 that engages the first housing 151.

The first housing 151 and the second housing 152 may be coupled to each other through a coupling member such as a bolt, a screw, or the like. The coupling protrusion (not shown) formed in one of the first housing 151 or the second housing 152 and the coupling protrusion formed on the other one of the first housing 151 or the second housing 152 (Not shown) and can be coupled to each other. The coupling protrusions are formed in the first housing 151 and the coupling protrusions are formed in the second housing 152 so that the first housing 151 and the second housing 152 are coupled to each other, Will be described in detail. The method of coupling the first housing 151 and the second housing 152 to each other is not limited to that described above and the method of coupling the first housing 151 and the second housing 152 to each other may be the same as that of the first housing 151 And the second housing 152 in combination with each other.

The first housing 151 and the second housing 152 may be coupled to each other to completely cover the rim of the rotor 140. At this time, the first housing 151 and the second housing 152 may be formed with a "C" shape so as to cover the rim of the rotor 140.

The motor assembly 100 may include a sealing portion 160 installed between at least two of the first housing 151, the second housing 152, and the rotor 140. More specifically, the sealing portion 160 includes a first sealing portion 161 provided at a portion where the first housing 151 and the second housing 152 are coupled to each other, a first sealing portion 161 formed between the first housing 151 and the rotor 140, And a third sealing part 163 provided between the second sealing part 162 and the rotor 140. The second sealing part 162 may be provided with a second sealing part 163 provided between the second sealing part 162 and the rotor 140.

At this time, the first to third sealing portions 161 to 163 may be formed in various shapes. For example, the first sealing portion 161 to the third sealing portion 163 may include an O-ring. The first sealing portion 161 to the third sealing portion 163 are not limited to the above and the refrigerant flowing between the first housing 151, the second housing 152, Or < / RTI >

The first housing 151 may include an insertion protrusion 153 protruding toward the rotor 140. At this time, the insertion protrusion insertion groove 143 may be formed in the rotor 140 so that the insertion protrusion 153 is inserted. A plurality of insertion projection insertion grooves 143 may be formed, and a plurality of insertion projection insertion grooves 143 may be formed to be spaced apart from each other. In particular, each insertion projection inserting groove 143 can be formed between adjacent magnet portions 142.

The insertion protrusion 153 is inserted into the insertion protrusion insertion groove 143 formed as described above to prevent the first housing 151 and the second housing 152 from being detached or rotated when the rotor 140 rotates .

The first housing 151 and the second housing 152 may be coupled to the rotor 140. The first housing 151 and the second housing 152 may be coupled to each other. At this time, the first to third sealing portions 161 to 163 may also be provided.

When the installation is completed as described above, a space is formed between the first housing 151, the second housing 152, and the rotor body 141, and a space between the first housing 151 and the second housing 152 And the refrigerant can be injected into the space through at least one of the two. At this time, the refrigerant may be formed of various materials. For example, the refrigerant may be cooling water and may be in the form of cooling oil. At this time, the cooling oil may include any type of oil which is generally used as a refrigerant.

The first housing 151, the second housing 152, the rotor body 141, the first sealing portion 161, the second sealing portion 162, And can be completely cut off from the outside by the third sealing portion 163.

Particularly, the first to third sealing portions 161 to 163 prevent the refrigerant from flowing out of the space, thereby allowing the refrigerant to stay in the rim of the rotor 140.

When the above operation is completed, the assembly of the motor assembly 100 can be completed by installing the rotor 140 inside the stator 120 and assembling the case 110.

Meanwhile, the assembled motor assembly 100 can be operated by receiving electricity from an external power source (not shown). Specifically, when electricity is supplied from the external power source, the polarity of the magnetic substance 121 is changed according to the power applied to the coil portion 122, and the rotor 140 can be rotated by the electromagnetic force. At this time, the temperature of the stator 120 can be prevented from rising due to the circulation of the cooling water in the case 110.

The housing 150 can be rotated together with the rotor 140. At this time, the refrigerant stored in the space can also be rotated. In addition, according to the rotation of the rotor 140, an eddy current loss occurs in the magnet portion 142 due to the stator 120, and the temperature of the magnet portion 142 can rise due to the eddy current loss. At this time, the refrigerant circulates around the magnet portion 142 to absorb the heat generated in the magnet portion 142. The absorbed heat is discharged to the outside through the housing 150 and may be discharged to the outside together with the air inside the rotor 140 and the stator 120.

On the other hand, a heat dissipating unit (not shown) may be formed on the surfaces of the first housing 151 and the second housing 152. At this time, the heat dissipating unit may have a concavo-convex shape or a heat dissipation fin shape. Also, the heat dissipation unit may have a small size and may have a surface roughness.

At this time, the heat dissipating unit can increase the cooling efficiency of the rotor 140 by increasing an area of contact between the outer surface of the first housing 151 and the outer surface of the second housing 152 and the outside air.

Therefore, the motor assembly 100 can effectively prevent the temperature rise of the rotor 140 by effectively discharging heat generated in the rotor 140 during operation. In addition, the motor assembly 100 can significantly increase the operating life of the motor assembly 100 by controlling the temperature of the rotor 140.

In addition, since the first housing 151 and the second housing 152 are provided on the rim of the rotor 140, the motor assembly 100 can shorten the working time during installation, The structure can be simplified.

Although the present invention has been described in connection with the above-mentioned preferred embodiments, it is possible to make various modifications and variations without departing from the spirit and scope of the invention. Accordingly, it is intended that the appended claims cover all such modifications and variations as fall within the true spirit of the invention.

100: Motor assembly
110: Case
120: stator
121: magnetic body
122: coil part
130: shaft
140: rotor
141: rotor body part
142: Magnet portion
143: insertion protrusion insertion groove
150: Housing
151: first housing
152: second housing
153: insertion projection
160: sealing part
161: first sealing portion
162: second sealing part
163: third sealing part

Claims (3)

Stator;
A rotor disposed inside the stator and rotating;
A housing installed to enclose the rotor and storing refrigerant therein; And
And a first sealing portion provided between the housing and the rotor,
The housing includes:
A first housing spaced apart from a part of the outer surface of the rotor and disposed to surround a part of the outer surface of the rotor;
A second housing coupled to the first housing; And
And a sealing portion provided between at least two of the first housing, the second housing and the rotor,
The first housing includes an insertion protrusion protruding toward the rotor,
Wherein the rotor has an insertion groove into which the insertion protrusion is inserted. delete delete

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