KR20120067855A - Electric motor and electric vehicle having the same - Google Patents

Abstract

PURPOSE: An electric motor and an electric vehicle having the same are provided to suppress the damage to a stator by intercepting the inflow of water. CONSTITUTION: A stator(110) comprises a stator core(111) having a plurality of slots and teeth, and a stator coil(121) wound on the stator core. A rotor(130) is pivotally arranged against the stator and is comprised of a rotary shaft(131), a rotor core(141) combined with the rotary shaft, and an induction rotor having a plurality of conductor bars(146) inserted into the rotor core. A thermoelectric element comprises a low temperature unit. A cooling unit(180) cools the stator.

Description

ELECTRIC MOTOR AND ELECTRIC VEHICLE HAVING THE SAME

The present invention relates to an electric motor and an electric vehicle having the same, and more particularly, to an electric motor and an electric vehicle having the same, which improves cooling performance to implement high power density and high efficiency.

As is well known, an electric motor is a device that converts electrical energy into mechanical energy.

Electric motors can be classified into direct current motors and alternating current motors according to their power source.

In addition, the AC motor may be divided into three-phase AC and single-phase AC, each of which has an induction motor and a synchronous motor.

Among them, induction motors can be directly connected to a power source, have a simple structure, and are robust, and are widely used because they are inexpensive and easy to handle.

On the other hand, in recent years, in order to prevent environmental pollution caused by harmful gases generated during fuel combustion of vehicles such as automobiles, electric motors are partially used as driving sources of vehicles.

Since the electric motor used as a driving source of the vehicle, that is, the electric vehicle electric motor generates high heat, a separate cooling means may be provided.

As the cooling means of the electric motor for such an electric vehicle, an air cooling type for forcibly blowing air to the electric motor and a water cooling type for supplying water to the electric motor for cooling may be used.

However, in such a conventional electric vehicle electric motor, when the air-cooled cooling means is used, the fan and / or the duct is provided to increase the size, and the cooling performance of the air is relatively insufficient compared to the heat generation of the electric motor. There is a limit to increasing the output.

In addition, when the water-cooled cooling means is used, the configuration becomes complicated and there is a fear of cracking (cracking) of the cooling flow path of the frame. When a crack occurs in the frame, leakage may occur inside the frame, thereby causing damage to the motor.

Accordingly, an object of the present invention is to provide an electric motor and an electric vehicle having the same, which can improve cooling performance and implement high power and high efficiency.

In addition, another object of the present invention is to provide an electric motor and an electric vehicle having the same capable of preventing damage to the stator by blocking the inflow of water when leakage occurs.

Another object of the present invention is to provide an electric motor capable of directly cooling the stator and an electric vehicle having the same.

The present invention, in order to achieve the above object, the stator; A rotor rotatably disposed with respect to the stator; And a cooling unit having a low temperature part disposed toward the stator to cool the stator.

The cooling unit may further include a heat transfer part interposed between the thermoelectric element and the stator.

The heat transfer part may include a heat transfer plate.

The heat transfer plate may be configured to include a contact surface that is in surface contact with the outer surface of the stator.

The heat transfer part may include a thermal grease or a thermal compound.

The electric motor may have a receiving space therein, and further include a frame for receiving the stator and the rotor.

The frame may include a through part, and the thermoelectric element may be provided inside the through part.

The high temperature portion of the thermoelectric element may be provided with a cooling member to promote heat dissipation.

The cooling member may be provided with a cooling passage to allow the cooling fluid to flow.

The frame may include a first frame having a through part and a second frame disposed outside the first frame, and the thermoelectric element may be configured to be provided in the through part.

A heat transfer part may be provided between the thermoelectric element and the second frame. Herein, the heat transfer part may be configured to include a heat transfer plate and / or a thermal grease or a thermal compound.

The through part may be provided with a sealing member.

A cooling flow path may be formed in the second frame to allow the cooling fluid to flow.

The second frame may be configured to be provided with a cooling fin.

On the other hand, according to another field of the present invention, an electric vehicle provided with the electric motor is provided.

As described above, according to one embodiment of the present invention, the surface of the stator can be directly cooled to rapidly cool the stator. Thereby, the cooling performance of the electric motor can be improved and an electric motor of high power density and high efficiency can be provided.

In addition, according to an embodiment of the present invention, since the cooling water and the stator are separated from each other, even if leakage of the cooling water occurs, the inflow of the cooling water may be suppressed. Thereby, the stator (winding) can be protected from water leakage when leakage of cooling water occurs.

1 is a cross-sectional view of an electric motor according to an embodiment of the present invention;
2 is an enlarged view illustrating main parts of FIG. 1;
3 is a perspective view illustrating a coupling state of the stator and the thermoelectric device of FIG. 1;
4 is a front view of FIG. 3;
5 is a perspective view of the cooling member of FIG.
6 is an enlarged cross-sectional view of the heat transfer plate of FIG. 5;
7 is a cross-sectional view of an electric motor according to another embodiment of the present invention;
8 is an enlarged view illustrating main parts of FIG. 7;
9 is an exploded perspective view of the thermoelectric element and the heat transfer plate of FIG. 7;
10 is a cross-sectional view of an electric motor according to another embodiment of the present invention;
FIG. 11 is an enlarged cross-sectional view taken along the line II-XI of FIG. 10.

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

[One]

As shown in Figure 1 and 2, the electric motor according to an embodiment of the present invention, the stator 110; A rotor (130) rotatably disposed with respect to the stator (110); And a cooling unit 180 that cools the stator 110 by including a thermoelectric element 150 disposed at a low temperature portion toward the stator 110.

The stator 110 may include a stator core 111 having a plurality of slots 116 and teeth 117, and a stator coil 121 wound around the stator core 111.

The stator core 111 has a plurality of electrical steel sheets through which the rotor accommodation hole 114 penetrates in the center, and a plurality of slots 116 and teeth 117 are provided along the circumferential direction of the rotor accommodation hole 114. The insulating layer 112 may be formed by insulation lamination.

The stator coil 121 may be configured to be connected to a three-phase AC power source.

The rotor 130 may be rotatably disposed at a predetermined air gap G in the rotor accommodation hole 114.

The rotor 130 has an induction rotor having a rotating shaft 131, a rotor core 141 coupled to the rotating shaft 131, and a plurality of conductor bars 146 inserted into the rotor core 141. ROTOR). Here, the stator 110 and the rotor 130 may be composed of a three-phase induction motor. In addition, the electric motor of the present invention may be used as a power source of an electric vehicle or a hybrid electric vehicle by being connected to an inverter that receives DC power from a battery and converts the AC power into three phases.

The rotor core 141 may be formed by insulating stacking a plurality of electrical steel plates 142 through which shaft holes 144 pass through.

The conductor bar 146 may be inserted in the axial direction of the rotor core 141. Both ends of the rotor core 141 may be provided with end rings 147 connecting the plurality of conductor bars 146 to be short-circuited.

The frame 160 may be provided outside the stator 110.

The frame 160 may be formed of a metal member or plastic to form an accommodation space therein.

The frame 160 may have a circular cross section.

The frame 160 may be formed so that both sides are open.

Covers 170 may be provided at both ends of the frame 160, respectively.

Each cover 170 may be provided with bearings 171 to rotatably support the rotation shafts 131, respectively.

On the other hand, the outer surface of the stator 110 may be provided with a cooling unit 180 having a thermoelectric cooler (TEC) (thermoelectric cooler, or thermoelectric element) 150.

The thermoelectric element 150 may be formed in a plate shape.

The thermoelectric element 150 may be formed of a rectangular parallelepiped having a thin thickness.

The thermoelectric element 150 may be configured as a Peltier device having a low temperature portion 152 and a high temperature portion 153.

The thermoelectric element 150 may be provided with a wire or a terminal so that DC power can be supplied. In this embodiment, it is assumed that the positive and negative terminals 155 are formed on one side of the thermoelectric element 150.

A plurality of thermoelectric elements 150 may be disposed on the outer surface of the stator 110. The thermoelectric element 150 may be disposed such that the low temperature portion 152 faces the surface of the stator 110. As a result, the heat generated by the stator 110 may be rapidly absorbed to radiate heat to the outside, thereby rapidly cooling the stator 110. In addition, since the temperature of the stator 110 does not increase significantly, the internal temperature of the frame 160 does not increase.

The cooling unit 180 may further include a heat transfer part 181 provided between the stator 110 and the thermoelectric element 150.

The heat transfer part 181 is present in the gap between the outer surface of the stator 110 and the thermoelectric element 150 and reduces the air (amount) having a very low heat transfer rate, thereby reducing the air flow between the stator 110 and the thermoelectric element 150. The heat transfer amount can be configured to increase.

The heat transfer part 181 may be composed of a thermal grease or a thermal compound (hereinafter, referred to as “thermal compound”).

As shown in FIG. 2, the heat transfer part 181 may be configured as a heat transfer plate 185.

The heat transfer plate 185 may be formed with a flat contact surface and a concave contact surface 187 to be in surface contact with the thermoelectric element 150 and the stator 110, respectively.

The concave contact surface 187 in contact with the stator 110 may be configured to have a radius of curvature corresponding to the outer diameter of the stator 110, as shown in FIG. 6.

The high temperature portion 153 of the thermoelectric element 150 may be provided with a cooling member 190 to promote heat dissipation of the thermoelectric element 150.

Meanwhile, a through part 162 may be formed in the frame 160 to accommodate the thermoelectric elements 150 protruding from the surface of the stator 110.

The cooling member 190 may be coupled to the through part 162.

As shown in FIGS. 3 and 4, the cooling member 190 may be disposed on the outer surface of the stator 110 to be spaced apart a predetermined distance along the circumferential direction.

The cooling member 190 may be larger than the through part 162.

As shown in FIG. 5, the cooling member 190 may be configured to be coupled to the frame 160 by a fastening member 194 such as a screw or bolt.

Fastening member insertion holes 192 are formed in the corner regions of the cooling member 190 so as to penetrate the fastening member 194.

The cooling member 190 may be provided with an insertion part 195 inserted into the through part 162. The insertion part 195 may be formed to protrude in a reduced size with respect to the main body of the cooling member 190.

The insertion unit 195 may have a thermoelectric element accommodating part 196 recessed to accommodate the thermoelectric element 150. Here, the thermoelectric element accommodating part 196 may be provided with a power supply part 157 to supply power to the thermoelectric element 150. The power supply unit 157 may be configured to be in contact with the positive and negative terminals 155 of the thermoelectric element 150, respectively. The power supply unit 155 may be connected to the power cable 158. Although FIG. 5 illustrates a state in which one power supply unit 157 is connected to the power cable 158, the power supply units 155 formed in the thermoelectric element accommodation units 196 are not shown in the drawing. However, each of the power cables 158 may be configured to be connected in parallel.

In addition, a thermal compound is provided inside the thermoelectric element accommodating part 196 such that air existing in the heat transfer system (for example, a gap formed between the thermoelectric element 150 and the peripheral parts) is discharged to increase the amount of heat transfer. Can be configured.

A cooling passage 205 may be formed in the cooling member 190 to allow the cooling fluid to flow. As a result, the temperature difference between the high temperature portion 153 of the thermoelectric element 150 and the cooling member 190 may be further increased to significantly promote heat dissipation of the high temperature portion 153 of the thermoelectric element 150.

The cooling fluid may be cooling water. Here, one side of the cooling member 190 is further provided with a pump (not shown) for promoting the flow of the cooling fluid of the cooling passage 205 and a cooling fluid cooling means (not shown) for cooling the cooling fluid. Can be.

A sealing member 166 may be provided in the mutual contact area between the cooling member 190 and the frame 160. As a result, when the cooling fluid leaks, the cooling fluid may be prevented from flowing into the frame 160 through the through part 162.

The sealing member 166 may be disposed along the circumference of the insertion unit 195.

A mounting portion 164 may be formed in the through portion 162 to allow the sealing member 166 to be seated. The seating portion 164 may be formed to extend a predetermined width compared to the through portion 162.

The cooling passage 205 may be formed through the cooling member 190.

The cooling passage 205 may include a straight section 206a penetrating the cooling member 190 and a connecting part 206b for connecting the straight section 206a to communicate with each other. The connecting portion 206b may be configured as a pipe having a “U” shape, as shown in FIG. 5.

The cooling passage 205 may be provided with an inlet tube 207 through which the cooling fluid flows and an outlet tube 208 through which the cooling fluid flows out. Here, in the present embodiment, the cooling passage 205 illustrates a case where the movement path of a single cooling fluid having one inlet pipe 207 and an outlet pipe 208 is formed. However, the cooling passage 205 may be configured to include a plurality of inlet and outlet tubes to form a movement path of the plurality of cooling fluids.

By this configuration, when power is applied to the stator coil 121, a magnetic field is generated, and the rotor 130 rotates about the rotation shaft 131 by interacting with the magnetic field. When power is applied to the stator coil 121, heat is generated to increase the temperature.

Meanwhile, a DC power may be supplied to the thermoelectric element 150 for cooling the stator 110. When power is supplied to the thermoelectric element 150, the low temperature portion 152 is cooled and the high temperature portion 153 has a temperature increase.

Accordingly, heat generated in the stator 110 is absorbed through the low temperature unit 152 of the thermoelectric element 150 and radiated through the high temperature unit 153. At this time, since the temperature difference between the low temperature unit 152 and the stator 110 of the thermoelectric element 150 is very large, heat exchange can be made quickly, and the stator 110 can be cooled very quickly. In addition, since the temperature difference between the high temperature portion 153 of the thermoelectric element 150 and the cooling member 190 cooled by the cooling fluid is very large, the high temperature portion 153 of the thermoelectric element 150 may be radiated very quickly. Can be.

 As a result, the thermoelectric element 150 directly acts on the stator 110 serving as a heat generating source, thereby allowing the stator 110 to be cooled very quickly. In addition, by continuously removing the heat generated in the stator 110, it is possible to suppress the heat of the stator 110 to spread to the surroundings. As a result, the internal temperature of the frame 160 may be prevented from rising. As described above, the present invention can prevent the temperature of the stator 110 and the rotor 130 from rising, thereby realizing a high power density and high efficiency electric motor.

[2]

Hereinafter, another embodiment of the present invention will be described with reference to FIGS. 7 and 8.

The same reference numerals and the same components as the above-described and illustrated configurations are denoted by the same reference numerals for convenience of description, and some overlapping descriptions will be omitted.

As shown in Figure 7 and 8, the electric motor according to another embodiment of the present invention, the frame 160; A stator 110 disposed inside the frame 160; A rotor (130) rotatably disposed with respect to the stator (110); And a cooling unit 180 for cooling the stator 110 by having a low temperature unit 152 having a thermoelectric element 150 disposed toward the stator 110.

The frame 160 may include a first frame 210 having a penetrating portion 212 and a second frame 220 disposed outside the first frame 210.

The first frame 210 may be configured to be in contact with the stator 110.

The first frame 210 may be formed in a cylindrical shape with an inner diameter corresponding to the outer diameter of the stator 110.

The first frame 210 may be formed so that both sides are open.

A plurality of through parts 212 may be formed on the circumferential surface of the first frame 210 so that the inside and the outside communicate. A plurality of through parts 212 may be formed on the circumferential surface of the first frame 210 to be spaced apart from each other along the axial direction and the circumferential direction.

The thermoelectric element 150 may be disposed in the through part 212. The through part 212 may be formed to accommodate one thermoelectric element 150 therein. The through part 212 may include a power supply unit 157 to supply DC power to the thermoelectric element 150. The power supply unit 157 may be configured to be in contact with the power terminal of the thermoelectric element 150, respectively.

The cooling unit 180 may include a heat transfer part 181 interposed between the stator 110 and the thermoelectric element 150.

The heat transfer part 181 may include a heat transfer plate 185 having a concave contact surface 187 in surface contact with the stator 110.

The heat transfer part 181 may be composed of a thermal compound interposed between the stator 110 and the thermoelectric element 150.

The heat transfer part 181 may include the heat transfer plate 185 and the thermal compound at the same time.

Meanwhile, the second frame 220 may have an inner diameter corresponding to the outer diameter of the first frame 210. The second frame 220 may be formed in a cylindrical shape with both sides open. The second frame 220 may be coupled in surface contact with the first frame 210. Here, the first frame 210 and the second frame 220 may be combined by applying a thermal compound to the mutual contact area before the coupling. As a result, the heat exchange amount between the first frame 210 and the second frame 220 may increase.

Here, the first frame 210 and the second frame 220 may be formed of the same length.

Covers 170 may be provided at both ends of the first frame 210 and the second frame 220, respectively. As a result, both ends of the first frame 210 and the second frame 220 may be blocked. The cover 170 may be provided with bearings 171 supporting the rotation shaft 131, respectively.

The cooling unit 180 may further include a heat transfer part 181 interposed between the second frame 220 and the thermoelectric element 150.

The heat transfer part 181 includes a heat transfer plate 231 having a high temperature portion 153 of the thermoelectric element 150 and a contact surface 233 in surface contact with an inner surface (inner diameter) of the second frame 220. Can be.

The heat transfer part 181 may be composed of a thermal compound.

The heat transfer part 181 may be configured to include the heat transfer plate 231 and the thermal compound.

As illustrated in FIG. 9, the heat transfer plate 231 may be provided with an arc-shaped contact surface 233 which is convex outwardly on one side to be in surface contact with the inner surface of the second frame 220.

The second frame 220 may be provided with a cooling passage 225 to allow the cooling fluid to flow.

The cooling passage 225 may be configured to include a straight section 226a penetrating the second frame 220 in the axial direction and a connecting part 226b for communicating the straight section 226a in communication. Can be. The connection part 226b may be formed to be recessed in the inner surface of the cover 170, respectively. The connection part 226b may be formed to connect two adjacent linear sections 226a adjacent to each other. In addition, the connection part 226b may be configured as a “U” -shaped connection pipe coupled through the cover 170.

By such a configuration, when operation is started, power may be applied to the stator coil 121 and the thermoelectric element 150, respectively.

When power is applied to the stator coil 121, a magnetic field is formed, and the rotor 130 rotates about the rotation shaft 131 by interacting with the stator 110.

When power is applied to the stator coil 121, heat is generated, and the temperature of the stator 110 increases.

On the other hand, when power is applied to the thermoelectric element 150, the low temperature portion 152 toward the stator 110 side decreases in temperature, and the high temperature portion 153 toward the second frame 220 side increases in temperature. do. Accordingly, since the temperature difference is very large between the stator 110 and the low temperature unit 152 of the thermoelectric element 150, heat exchange may be rapid. Thereby, the stator 110 can be cooled very quickly. In addition, since the temperature difference between the high temperature unit 153 of the thermoelectric element 150 and the cooling fluid is very large, the heat dissipation of the high temperature unit 153 of the thermoelectric element 150 is made very quickly. Can be. By repeatedly performing this process, heat generated in the stator 110 may be quickly moved and removed so that the stator 110 may always maintain a low temperature. In addition, since the temperature of the stator 110 does not increase, the temperature of the rotor 130 may also be operated in a low state.

[3]

Hereinafter, another embodiment of the present invention will be described with reference to FIGS. 10 and 11.

10 and 11, the motor according to another embodiment of the present invention, the frame 160; A stator 110 disposed inside the frame 160; A rotor (130) rotatably disposed with respect to the stator (110); And a cooling unit 180 for cooling the stator 110 by having a low temperature unit 152 having a thermoelectric element 150 disposed toward the stator 110.

The frame 160 may include a first frame 210 having a penetrating portion 212 and a second frame 240 disposed outside the first frame 210.

The first frame 210 may be formed in a cylindrical shape with an inner diameter corresponding to the outer diameter of the stator 110.

The first frame 210 may be formed so that both sides are open.

A plurality of through parts 212 may be formed on the circumferential surface of the first frame 210 so that the inside and the outside communicate.

The thermoelectric element 150 may be disposed in the through part 212.

The cooling unit 180 may include a heat transfer part 181 interposed between the stator 110 and the thermoelectric element 150.

The heat transfer part 181 may include a heat transfer plate 185 having a concave contact surface 187 in surface contact with the stator 110.

The second frame 240 may be formed to have an inner diameter corresponding to the outer diameter of the first frame 210. The first frame 210 and the second frame 240 may be formed to have the same length so that both sides have an open cylindrical shape. Covers 170 may be provided at both ends of the first frame 210 and the second frame 240, respectively.

The cooling unit 180 may include a heat transfer part 181 interposed between the thermoelectric element 150 and the inner diameter of the second frame 240.

The heat transfer part 181 interposed between the high temperature part 153 of the thermoelectric element 150 and the inner surface of the second frame 240 may be formed of a thermal compound.

Meanwhile, a plurality of cooling fins 242 may be provided on the outer surface of the second frame 240 to increase the heat dissipation area. As a result, the total heat dissipation area of the second frame 240 may increase, and as a result, heat dissipation of the high temperature portion 153 of the thermoelectric element 150 may be promoted.

The cooling fin 242 may be configured to protrude from the outer surface of the second frame 240 and extend in the longitudinal direction. The cooling fins 242 may be configured to be spaced apart from each other at predetermined intervals along the longitudinal direction.

A blowing fan (not shown) may be further provided around the cooling fins 242 to promote heat dissipation of the second frame 240 and the cooling fins 242.

By such a configuration, when operation is started, power may be applied to the stator coil 121 and the thermoelectric element 150, respectively.

When power is applied to the thermoelectric element 150, the low temperature portion 152 of the thermoelectric element 150 decreases in temperature and the high temperature portion 153 increases in temperature.

Accordingly, since the temperature difference between the stator 110 and the low temperature unit 152 of the thermoelectric element 150 having a high temperature is very large, heat exchange between the stator 110 and the low temperature unit 152 may be performed very quickly. Thereby, the stator 110 can be cooled very quickly.

The second frame 240, which is in contact with the high temperature portion 153 of the thermoelectric element 150, has a high temperature portion 153 of the thermoelectric element 150 with the surface area (heat dissipation area) significantly extended by the cooling fin 242. It can keep the temperature relatively low compared to). Accordingly, heat dissipation of the high temperature portion 153 of the thermoelectric element 150 may be performed very quickly.

By repeatedly performing this process, heat generated in the stator 110 may be quickly removed, so that the stator 110 may always maintain a low temperature.

In addition, since the temperature of the stator 110 does not increase high, the temperature of the rotor 130 does not increase, so the stator 110 and the rotor 130 may be operated at a relatively low temperature. Thereby, the efficiency decrease by the temperature rise can be prevented, and since the forced deterioration of the parts due to the temperature rise hardly occurs, the life of the parts can be extended.

In the above-described and illustrated embodiments, the case in which the heat transfer plate is provided between the stator and the thermoelectric element has been described as an example. It may be.

In addition, the heat transfer plate is provided between the thermoelectric element and the second frame, for example.

In the above, specific embodiments of the present invention have been shown and described. However, the present invention can be embodied in various forms without departing from the spirit or essential features thereof, so the embodiments described above should not be limited by the details of the detailed description.

Further, even when the embodiments not listed in the detailed description have been described, it should be interpreted broadly within the scope of the technical idea defined in the appended claims. It is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

110: stator 111: stator core
121: stator coil 130: rotor
131: rotation axis 141: rotor core
150: thermoelectric element 152: low temperature part
153: high temperature section 155: terminal
160: frame 162: through part
164: mounting portion 166: sealing member
170: cover 181: heat transfer part
185: heat transfer plate 187: contact surface
190: cooling member 195: insertion portion
196: thermoelectric element accommodating part 205: cooling flow path
206a: straight section 206b: connecting section
207: inlet pipe 208: outlet pipe

Claims (15)

Stator;
A rotor rotatably disposed with respect to the stator; And
A cooling unit for cooling the stator with a thermoelectric element having a low temperature portion disposed toward the stator;
Electric motor comprising a. The method of claim 1,
The cooling unit further comprises a heat transfer part interposed between the thermoelectric element and the stator. The method of claim 2,
The heat transfer unit is characterized in that it comprises a heat transfer plate. The method of claim 3,
And the heat transfer plate has a contact surface that is in surface contact with the outer surface of the stator. The method of claim 1,
The heat transfer unit is an electric motor, characterized in that it comprises a thermal compound. The method according to any one of claims 1 to 5,
The motor further includes an accommodation space, and further comprising a frame for accommodating the stator and the rotor. The method of claim 6,
The frame is provided with a through portion, the thermoelectric element is characterized in that the electric motor is provided in the through portion. The method of claim 7, wherein
The high temperature portion of the thermoelectric element is characterized in that the electric motor is provided with a cooling member for promoting heat dissipation. The method of claim 8,
The cooling member is provided with a cooling flow path for the cooling fluid flows. The method of claim 6,
The frame includes a first frame having a through portion, and a second frame disposed outside the first frame, wherein the thermoelectric element is provided in the through portion. The method of claim 10,
And a heat transfer part is provided between the thermoelectric element and the second frame. The method of claim 10,
The penetrating portion is provided with a sealing member electric motor. The method according to any one of claims 10 to 12,
The second frame is characterized in that the cooling flow path is provided so that the cooling fluid flows. The method of claim 10,
The second frame is characterized in that the cooling fin is provided with an electric motor. An electric vehicle provided with the electric motor of claim 1.

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