WO2022215965A1

WO2022215965A1 - Motor comprising cooling module and motor cooling system

Info

Publication number: WO2022215965A1
Application number: PCT/KR2022/004753
Authority: WO
Inventors: 박일석; 장연욱; 전종욱
Original assignee: 경북대학교 산학협력단
Priority date: 2021-04-06
Filing date: 2022-04-04
Publication date: 2022-10-13
Also published as: KR102597645B1; KR20220138629A

Abstract

A motor according to an embodiment comprises: a rotor rotatable around a rotary shaft; a stator surrounding the rotor; a winding wound inside the stator to form a magnetic field by a current to rotate the rotor; and a cooling case coupled to an end of the stator, wherein the cooling case is formed to surround a tip portion of the winding protruding to the outside of the end of the stator, and cools the winding by using a cooling fluid circulating from the outside.

Description

Motor and motor cooling system including cooling module

Disclosed is a motor and a motor cooling system including a cooling module. Specifically, a cooling module for cooling a closed winding tip using a cooling fluid, a motor provided with the cooling module, and a motor cooling system for generating heat exchange while circulating the cooling fluid are disclosed.

In general, a motor consists of a stator and a rotor. The stator has windings wound around it, and when current flows through the windings, a magnetic field can be formed. When a magnetic field is generated in this way, the rotor rotates to generate power of the motor. At this time, heat is generated inside the motor due to an electrical loss caused by current flowing through the winding and a mechanical loss occurring according to the rotation of the motor. In particular, when the motor is running, the highest heat is generated at the end of the winding, which generally protrudes in the axial direction of the motor. If the motor is not properly cooled against such heat, problems such as a shortened bearing life or deterioration of an internal insulation part may cause problems such as insulation damage. Ultimately, these issues can affect the performance of the motor. Therefore, in order to improve the performance of the motor, it is necessary to efficiently cool the heat generated inside the motor.

The above-mentioned background art is possessed or acquired by the inventor in the process of derivation of the present invention, and cannot necessarily be said to be a known technology disclosed to the general public prior to the filing of the present invention.

Prior art document: Japanese Patent Publication No. 5267750

An object according to an embodiment is to cool the winding tip using a cooling case that surrounds the entire winding tip of the motor and can accommodate cooling oil inside, and improves the cooling efficiency of the motor, thereby ultimately improving the performance of the motor. and to provide a motor cooling system.

The problems to be solved in the embodiments are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

A motor according to an embodiment for achieving the above object includes a rotor rotatable about a rotation axis; a stator surrounding the rotor; a winding wound inside the stator to form a magnetic field by an electric current to rotate the rotor; and a cooling case coupled to an end of the stator, wherein the cooling case is formed to surround a tip portion of the winding protruding outward from the end of the stator, and uses a cooling fluid circulating from the outside to cool the winding. can be cooled

According to one side, the cooling case may include a receiving portion surrounding the tip portion of the winding to be sealed; an inlet for allowing the inflow of the cooling fluid from the outside into the accommodating part; and an outlet for discharging the cooling fluid from the accommodating part to the outside, wherein the cooling fluid may cause heat exchange between the winding and the outside while moving the accommodating part.

According to one side, the inlet and the outlet may be disposed to face each other on the outer surface of the cooling case.

According to one side, the inlet and the outlet may be disposed adjacent to each other on the outer surface of the cooling case.

According to one side, the stator may include: donut-shaped end plates stacked on both ends of the stator, respectively; and a plurality of winding portions formed on the end plate, wherein the winding is wound on the end plate over both ends so that a tip portion of the winding protrudes outwardly of the end, and the winding portion is inside the stator. Or it may only allow passage of the winding to the outside.

A cooling module according to an embodiment for achieving the above object includes: an end plate stacked on both ends of a stator constituting a motor and wound with a winding; a plurality of windings formed on the end plate and allowing only passage of the windings; an accommodating part forming a ring-shaped opening inside the cooling case coupled to the end of the stator and enclosing the tip of the winding protruding to the outside of the end; an inlet for allowing a cooling fluid to flow into the accommodating part from the outside of the motor; and an outlet for discharging the cooling fluid from the accommodating part to the outside, wherein the end plate and the accommodating part are coupled to correspond to each other to seal the tip of the winding, and the cooling fluid is moved along the accommodating part with the winding and It can cause heat exchange between the outside.

A motor cooling system according to an embodiment for achieving the above object includes a motor into which a cooling fluid is introduced; a filter for filtering the cooling fluid discharged from the motor to the outside; and a cooler that cools the cooling fluid that has absorbed the heat of the motor, wherein the cooling fluid cooled by the cooler flows back into the motor to cool the motor, and the motor is rotatable about a rotating shaft rotor; a stator surrounding the rotor; a winding wound inside the stator to form a magnetic field by an electric current to rotate the rotor; and a cooling case coupled to an end of the stator so as to surround a tip portion of the winding protruding outside the end of the stator, wherein the cooling fluid passes through the inside of the cooling case and absorbs heat generated in the winding can absorb.

According to one side, the motor cooling system may further include a pump for moving the cooling fluid from the filter to the cooler or from the cooler to the motor.

According to the motor and motor cooling system according to an embodiment, the winding tip is cooled using a cooling case that surrounds the entire winding tip of the motor and can accommodate cooling oil therein, and ultimately improves the cooling efficiency of the motor, thereby improving the performance of the motor has the effect of improving

Effects of the motor and the motor cooling system according to an embodiment are not limited to those mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the following description.

1 shows a motor according to an embodiment.

2 shows a stator of a motor according to an embodiment;

3 shows a cooling case of a motor according to an embodiment.

FIG. 4 shows a cooling case having a structure different from that of the cooling case of FIG. 3 .

5 schematically shows a motor cooling system according to an embodiment.

The following drawings attached to the present specification illustrate a preferred embodiment of the present invention, and serve to further understand the technical spirit of the present invention together with the detailed description of the present invention, so the present invention is limited to the matters described in those drawings It should not be construed as being limited.

Hereinafter, embodiments will be described in detail with reference to exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same components are given the same reference numerals as much as possible even though they are indicated on different drawings. In addition, in the description of the embodiment, if it is determined that a detailed description of a related known configuration or function interferes with the understanding of the embodiment, the detailed description thereof will be omitted.

In addition, in describing the components of the embodiment, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the elements from other elements, and the essence, order, or order of the elements are not limited by the terms. When it is described that a component is “connected”, “coupled” or “connected” to another component, the component may be directly connected or connected to the other component, but between each component another component It will be understood that may also be "connected", "coupled" or "connected".

Components included in one embodiment and components having a common function will be described using the same names in other embodiments. Unless otherwise stated, descriptions described in one embodiment may be applied to other embodiments as well, and detailed descriptions within the overlapping range will be omitted.

1 shows a motor 10 according to an embodiment.

Referring to FIG. 1 , a motor 10 according to an embodiment includes a rotor 101 , a stator 102 , a winding 103 , and a cooling case 104 .

The rotor 101 may rotate about a rotation axis of the motor 10 . For example, the rotor 101 may have a cylindrical shape.

The stator 102 may surround the rotor 101 . For example, the stator 102 may have a hollow cylindrical shape.

The winding 103 is wound inside the stator 102 and may form a magnetic field by an electric current. The magnetic field formed by the winding 103 may rotate the rotor 101 . For example, the winding 103 may be provided as a coil. In addition, the winding 103 may be wound such that the tip portion protrudes outside the end of the stator 102 as shown in FIG. 1 . At this time, although not shown in FIG. 1 , the tip of the winding 103 may protrude outward from the rear end as well as the front end of the stator 102 .

The cooling case 104 may be coupled to an end of the stator 102 . For example, the pair of cooling cases 104 may be respectively coupled to both ends of the stator 102 . In this case, the cooling case 104 may surround the tip portion of the protruding winding 103 . In addition, the inside of the cooling case 104 may accommodate a cooling fluid. The cooling fluid may cool the tip portion of the winding 103 while moving inside the cooling case 104 .

Hereinafter, the structures of the stator 102 and the cooling case 104 for cooling the winding 103 will be described in more detail with reference to FIGS. 2 to 4 .

2 shows a stator 102 of a motor 10 according to one embodiment.

Fig. 2(a) is a front view of the stator 102, and Fig. 2(b) is a perspective view of the stator 102 cut along the line B-B of Fig. 2(a).

Referring to FIG. 2 , the stator 102 includes an end plate 1021 , a winding portion 1022 , and an exposed portion 1023 .

Referring to FIG. 2A , the end plate 1021 may be formed in a donut shape. The end plate 1021 may constitute both ends of the stator 102 . Alternatively, the end plates 1021 are donut-shaped flat plates provided as a pair, and may be respectively stacked on the front and rear ends of the stator 102 .

The winding portion 1022 may be formed on the end plate 1021 . The winding portion 1022 is a square or circular through-hole, and a plurality of windings may be formed in the end plate 1021 . The winding 103 may be wound on the stator 102 through the winding portion 1022 . For example, one winding 103 includes a pair of winding portions 1022 formed on the front end plate 1021 and the winding portion 1022 of the front end plate 1021 and the stator 102 in the longitudinal direction. It may be wound over a pair of windings 1022 of the rear end plate 1021 formed at corresponding positions. The motor 10 of FIG. 1 shows a state in which the windings 103 are wound around all the windings 1022 . At this time, as shown in FIG. 1, a part of the winding may protrude to the outside of the front or rear end plate 1021, which is referred to as a tip of the winding.

In addition, the winding portion 1022 may be formed in a shape and size that allows only the winding to pass therethrough. That is, the winding unit 1022 does not allow other materials including a cooling fluid other than the winding to flow into the stator.

As a result, when the cooling case 104 is respectively coupled to both ends of the stator 102 , the tip portion of the winding 103 may be sealed between the end plate 1021 and the cooling case 104 .

Referring to FIG. 2B , the exposed portion 1023 may be formed on the inner surface of the stator 102 . The exposed portion 1023 may be provided with a plurality of elongated openings. The exposed portion 1023 may expose the winding wound on the stator 102 through the winding portion 1022 to the outer surface of the rotor 101 . That is, even if the tip of the winding 103 is sealed by the coupling of the cooling case 104 as described above, the magnetic field generated by the winding may be transmitted to the rotor 101 through the exposed portion 1023 .

3 shows a cooling case 104 of the motor 10 according to an embodiment.

3 (a) is a front view of the cooling case 104, FIG. 3 (b) is a rear view of the cooling case (104).

Referring to FIG. 3 , the cooling case 104 includes an accommodating part 1041 , an inlet 1042 , an outlet 1043 , and a coupling part 1044 .

The receiving portion 1041 may receive a tip portion of the winding 103 . When the cooling case 104 is coupled to the stator 102, the receiving portion 1041 surrounds the tip portion to seal. In addition, the accommodating part 1041 may accommodate the cooling fluid. At this time, the cooling fluid may move along the accommodating part 1041 .

The inlet 1042 may be formed on one side of the cooling case 104 . The inlet 1042 may communicate the outside of the cooling case 104 with the accommodating part 1041 . Accordingly, the cooling fluid may be introduced into the accommodating part 1041 from the outside.

The outlet 1043 may be formed on the other side of the cooling case 104 . For example, the outlet 1043 may be disposed to face the inlet 1042 on the outer surface of the cooling case 104 . This outlet 1043 may also communicate the outside of the cooling case 104 and the accommodating portion 1041 . Accordingly, the cooling fluid may be discharged from the accommodating part 1041 to the outside.

A plurality of coupling portions 1044 may be formed on the outer or inner surface of the cooling case 104 . Each of these coupling portions 1044 may be coupled to an outer surface or an inner surface of an end of the stator 102 . Accordingly, the cooling case 104 may be fixed to the end of the stator 102 with the tip of the winding 103 sealed.

As shown in FIG. 3B , the cooling fluid enters the receiving portion 1041 through the inlet 1042 and may move along the receiving portion 1041 in the direction of the arrow. At this time, the cooling fluid may absorb heat generated in the winding 103 while in contact with the tip of the winding 103 sealed by the accommodating part 1041 . The cooling fluid absorbing heat may be discharged to the outside through the outlet 1043 by moving in the direction of the arrow. The cooling fluid may radiate heat from the outside and circulate back to the cooling case 104 .

As described above, the cooling case 104 may seal the tip of the winding 103 and accommodate the cooling fluid to be in contact with the tip, thereby cooling the tip of the winding 103 . In addition, the cooling fluid is formed to circulate through the outside and the cooling case 104 to cause heat exchange between the winding 103 and the outside.

FIG. 4 shows a cooling case 114 having a structure different from that of the cooling case 104 of FIG. 3 .

4 (a) is a front view of the cooling case (114), FIG. 4 (b) is a rear view of the cooling case (114).

Referring to FIG. 4 , the cooling case 114 includes an accommodating part 1141 , an inlet 1143 , an outlet 1142 , and a coupling part 1144 .

The receiving portion 1141 may receive a tip portion of the winding 103 . When the cooling case 114 is coupled to the stator 102, the receiving portion 1141 surrounds the tip portion to seal. In addition, the accommodating part 1141 may accommodate the cooling fluid. At this time, the cooling fluid may move along the accommodating part 1141 .

The inlet 1143 may be formed on one side of the cooling case 114 . The inlet 1143 may communicate the outside of the cooling case 114 with the accommodating part 1141 . Accordingly, the cooling fluid may be introduced into the accommodating part 1141 from the outside.

The outlet 1142 may be formed on the other side of the cooling case 114 . For example, the outlet 1142 may be disposed adjacent to the inlet 1143 on the outer surface of the cooling case 114 . This outlet 1142 may also communicate the outside of the cooling case 114 with the receiving portion 1141 . Accordingly, the cooling fluid may be discharged from the accommodating part 1141 to the outside.

A plurality of coupling portions 1144 may be formed on the outer or inner surface of the cooling case 114 . Each of these coupling portions 1144 may be coupled to an outer surface or an inner surface of an end of the stator 102 . Accordingly, the cooling case 114 may be fixed to the end of the stator 102 with the tip of the winding 103 sealed.

As shown in FIG. 2(b) , the cooling fluid enters the receiving part 1141 through the inlet 1143 and may move along the receiving part 1141 in the direction of the arrow. At this time, the cooling fluid may absorb heat generated in the winding 103 while in contact with the tip of the winding 103 sealed by the accommodating part 1141 . The cooling fluid absorbing heat may be discharged to the outside through the outlet 1142 by moving in the direction of the arrow. The cooling fluid may radiate heat from the outside and circulate back to the cooling case 114 .

As described above, the cooling case 114 may seal the tip of the winding 103 and accommodate the cooling fluid to be in contact with the tip, thereby cooling the tip of the winding 103 . In addition, the cooling fluid is formed to circulate through the outside and the cooling case 114 to cause heat exchange between the winding 103 and the outside.

In addition, it is possible to configure the cooling module by integrating the components of the stator 102 and the cooling case 104 described above.

For example, the cooling module may include an end plate 1021 , a winding portion 1022 , a receiving portion 1041 , an inlet 1042 , and an outlet 1043 .

Specifically, the end plate 1021 may be laminated on both ends of the stator 102 constituting the motor 10 , respectively, and the winding 103 may be wound.

A plurality of winding units 1022 may be formed on the end plate 1021 . This winding 1022 may only allow passage of the winding 103 .

The receiving portion 1041 may form a ring-shaped opening inside the cooling case 104 coupled to the end of the stator 102 and surround the tip portion of the winding 103 protruding to the outside of the end.

The inlet 1042 may allow the inflow of the cooling fluid from the outside of the motor 10 to the accommodating part 1041 .

The outlet 1043 may discharge the cooling fluid from the receiving part 1041 to the outside.

In this case, the inlet 1042 and the outlet 1043 may be disposed to face each other or disposed adjacent to each other on the outer surface of the cooling case 104 .

The cooling module configured as described above may seal the tip of the winding 103 by coupling the end plate 1021 and the receiving portion 1041 to correspond to each other. In addition, the cooling fluid may cause heat exchange between the winding 103 and the outside while moving along the receiving portion 1041.

Hereinafter, the motor cooling system 1 for cooling the motor 10 provided with the above-described cooling module will be described.

5 schematically shows a motor cooling system 1 according to an embodiment.

Referring to FIG. 5 , the motor cooling system 1 according to an embodiment may include a motor 10 , a filter 20 , a pump 30 , and a cooler 40 .

Specifically, the motor 10 may receive a cooling fluid circulating therein.

In addition, the motor 10 may include a rotor 101 , a stator 102 , a winding 103 , and a cooling case 104 . At this time, the rotor 101 , the stator 102 , the winding 103 and the cooling case 104 are the rotor 101 , the stator 102 , and the winding of the motor 10 described with reference to FIGS. 1 to 4 . 103 and the cooling case 104 may have the same configuration.

The rotor 101 may rotate about a rotation axis.

The stator 102 may surround the rotor 101 .

The winding 103 is wound inside the stator 102 and forms a magnetic field by current to rotate the rotor 101 .

The cooling case 104 may be coupled to the end of the stator 102 so as to surround the tip portion of the winding 103 protruding outside the end of the stator 102 . At this time, the tip of the winding 103 may be sealed between the end of the stator 102 and the cooling case 104 . In addition, the cooling case 104 may accommodate a cooling fluid therein. The cooling fluid may contact the tip of the winding 103 while passing through the inside of the cooling case 104 and absorb heat generated from the winding 103 . In addition, the cooling fluid absorbing the heat emits the heat absorbed from the winding 103 while passing through the filter 20 , the pump 30 and the cooler 40 , and the cooling case 104 to cool the motor 10 again. ) can enter the interior.

The filter 20 may filter the cooling fluid discharged from the motor 10 .

The pump 30 may be disposed between the filter 20 and the cooler 40 . The pump 30 may move the cooling fluid from the filter 20 to the cooler 40 . In addition, the pump 30 may be additionally disposed between the cooler 40 and the motor 10 . The pump 30 may move the cooling fluid from the cooler 40 to the motor 10 . That is, the cooling fluid may be moved toward the inlet 1042 of the cooling case 104 by the pump 30 .

The cooler 40 may cool the cooling fluid that has absorbed the heat of the motor 10 . The cooling fluid cooled by the cooler 40 is introduced into the cooling case 104 of the motor 10 again to absorb heat from the tip portion of the winding 103 to cool the motor 10 .

As described above, the motor cooling system 1 according to an embodiment may circulate a cooling fluid to effectively cool the motor 10 . At this time, the cooling fluid may be introduced into the cooling case 104 of the motor 10 to absorb the heat of the winding 103 , and may be discharged to the outside of the cooling case 104 . The discharged cooling fluid may discharge heat absorbed while passing through the filter 20 , the pump 30 , and the cooler 40 . The cooled cooling fluid may flow back into the cooling case 104 to cool the motor 10 .

In the motor 10 and the motor cooling system 1 including the same according to an embodiment, a cooling case 104 sealing the tip portion of the winding 103 is coupled to the end of the stator 102 of the motor 10, so that the motor ( 10), in particular, the heat generated in the winding 103 can be effectively cooled. In addition, the motor 10 and the motor cooling system 1 including the same according to an embodiment may have the above-described cooling module, so that the tip of the winding 103 may be oil-cooled using a cooling fluid, and the motor 10 ) to prevent the cooling fluid from leaking inside. In addition, the motor 10 and the motor cooling system 1 having such a structure are easy to manufacture because the pressure of the cooling fluid required is lower than that of the injection method.

As a result, the motor 10 and the motor cooling system 1 including the same according to an embodiment may have a uniform and high cooling performance by having a cooling module that allows the entire tip portion of the winding 103 to be immersed in oil. And, it is possible to prevent deterioration of the performance of the motor 10 .

As described above, the embodiment of the present invention has been described with specific matters such as specific components and limited embodiments and drawings, but these are only provided to help a more general understanding of the present invention, and the present invention is limited to the above embodiments Various modifications and variations are possible from these descriptions by those of ordinary skill in the art to which the present invention pertains. For example, the described techniques are performed in an order different from the described method, and/or the described components of structures, devices, etc. are combined or combined in a different form than the described method, or other components or equivalents. Appropriate results can be achieved even if substituted or substituted by Therefore, the spirit of the present invention should not be limited to the described embodiments, and not only the claims to be described later, but also all those with equivalent or equivalent modifications to the claims will be said to belong to the scope of the spirit of the present invention. .

Claims

a rotor rotatable about an axis of rotation;

a stator surrounding the rotor;

a winding wound inside the stator to form a magnetic field by an electric current to rotate the rotor; and

a cooling case coupled to an end of the stator;

including,

The cooling case is formed to surround a tip portion of the winding that protrudes outward from the end of the stator, and cools the winding using a cooling fluid circulating from the outside.
According to claim 1,

The cooling case is

a receiving portion enclosing the tip portion of the winding to seal it;

an inlet for allowing the inflow of the cooling fluid from the outside into the accommodating part; and

an outlet for discharging the cooling fluid from the receiving unit to the outside;

including,

The cooling fluid causes heat exchange between the winding and the outside while moving the receiving portion, the motor.
3. The method of claim 2,

The inlet and the outlet are disposed to face each other on the outer surface of the cooling case, the motor.
3. The method of claim 2,

The inlet and the outlet are disposed adjacent to each other on the outer surface of the cooling case, the motor.
According to claim 1,

The stator is

donut-shaped end plates stacked on both ends of the stator, respectively; and

a plurality of windings formed on the end plate;

including,

The winding is wound on the end plate over both ends such that a tip portion of the winding protrudes outward of the end,

the winding only permits passage of the winding into or out of the stator.
an end plate stacked on both ends of a stator constituting the motor, respectively, on which windings are wound;

a plurality of windings formed on the end plate and allowing only passage of the windings;

a receiving part forming a ring-shaped opening inside the cooling case coupled to the end of the stator and enclosing a tip portion of the winding protruding outward from the end;

an inlet for allowing a cooling fluid to flow into the accommodating part from the outside of the motor; and

an outlet for discharging the cooling fluid from the receiving unit to the outside;

including,

The end plate and the receiving portion are coupled to correspond to sealing the tip of the winding,

The cooling module causes heat exchange between the winding and the outside while the cooling fluid moves along the accommodating part.
7. The method of claim 6,

The inlet and the outlet are disposed to face each other on the outer surface of the cooling case, the cooling module.
7. The method of claim 6,

The inlet and the outlet are disposed adjacent to each other on the outer surface of the cooling case, the cooling module.
a motor into which cooling fluid is introduced;

a filter for filtering the cooling fluid discharged from the motor to the outside; and

a cooler for cooling the cooling fluid that has absorbed the heat of the motor;

including,

The cooling fluid cooled by the cooler flows back into the motor to cool the motor,

The motor is

a rotor rotatable about an axis of rotation;

a stator surrounding the rotor;

a winding wound inside the stator to form a magnetic field by a current to rotate the rotor; and

a cooling case coupled to an end of the stator to surround a tip portion of the winding protruding outside the end of the stator;

including,

The cooling fluid passes through the inside of the cooling case, and absorbs heat generated in the windings.
10. The method of claim 9,

The motor cooling system further comprising a pump for moving the cooling fluid from the filter to the cooler or from the cooler to the motor.