JP2023150379A - Heat exchanger - Google Patents

Abstract

To provide a heat exchanger that does not impede drive of an electric motor, enables efficient cooling, and has excellent durability and handling performance.SOLUTION: The present invention that solves the above problems relates to a heat exchanger X provided on a motor 1 including permanent magnets 12 rotated around a rotation axial center 11. The heat exchanger X includes a pipeline 22 surrounding the rotation axial center 11, has magnetic fluid M1 and magnetic particles M3 inside the pipeline 22, and uses leakage magnetic flux emitted from the motor 1 to cause rotation inside the pipeline 22.SELECTED DRAWING: Figure 1

Description

The present invention relates to a heat exchanger for an electric motor that uses a magnetic material.

An electric motor is a machine that generates rotational force through the interaction of a current flowing in a predetermined direction and a magnetic field generated by a magnet. On the other hand, it is known that when an electric motor operates, heat is generated due to eddy currents and the like, which causes the temperature of the internal magnet to rise and the magnetic force to decrease, resulting in a sudden decrease in the efficiency of the electric motor.
In order to deal with such problems, Patent Document 1 describes an electric motor that is provided with a heat pipe inside for cooling the magnet.

Moreover, as a heat exchanger using a magnetic material, one that utilizes the magnetocaloric effect is widely known. The magnetocaloric effect is a phenomenon in which removing a magnetic field from a paramagnetic material increases entropy and causes an endothermic reaction. As an example, Patent Document 2 describes a heating and cooling device that controls heat radiation and heat absorption by adding and removing magnetism.

Further, as a heat exchanger using a magnetic material, there is one that utilizes the relationship between the magnetic force of a magnetic material and temperature. In other words, by taking advantage of the fact that the magnetic force of a magnetic material decreases at high temperatures, a magnetic fluid is sealed in a conduit and a magnetic field is applied to a predetermined position on the low temperature side to generate a unidirectional flow. A CPU cooling device is described in Patent Document 3.

Japanese Patent Application Publication No. 2019-161785 Re-table No. 2012-157708 Patent No. 7012404

As mentioned above, cooling the electric motor is important for efficient rotation, and in order to apply a heat exchanger that utilizes the effect of magnetic force as described in Patent Document 2 and Patent Document 3. In this case, it is necessary to place the ferromagnetic material unevenly near the electric motor. This is not preferable because it may affect the behavior of the electric motor and may even hinder the movement of the electric motor.
In addition, especially in vehicles, a heat exchanger that uses an oil pump that operates together with the engine is often installed to cool the engine, but since a portion of the engine's power is used, the efficiency of the engine decreases. Also, because the number of moving parts increases, failures are more likely to occur.

In view of the above-mentioned problems, an object of the present invention is to provide a heat exchanger, etc. that does not inhibit the drive of an electric motor, enables efficient cooling, and has excellent durability and handling performance.

The present invention that solves the above problems is a heat exchanger provided in a motor equipped with a magnet that rotates around a rotation axis, the heat exchanger including a pipe line surrounding the rotation axis, and a magnetic It is a heat exchanger with a body.
With such a configuration, it is possible to use a magnetic body as a refrigerant, and since the refrigerant is driven using leakage magnetic flux emitted from the electric motor, efficient cooling of the motor is possible.

In a preferred form of the invention, the conduit has a check valve for controlling flow within the conduit, and the check valve is provided in close proximity to the motor.
Such a configuration can reduce backflow caused by the magnetism of the motor.

In a preferred form of the invention, the conduit has a check valve for controlling flow within the conduit, and the check valve is a Tesla valve.
With such a configuration, it is possible to prevent backflow caused by the magnetism of the motor without providing a separate drive mechanism.

In a preferred embodiment of the present invention, the magnetic body is a sphere.
Such a configuration allows the magnetic material to flow easily in the pipe.

In a preferred embodiment of the present invention, the magnetic material is a magnetic fluid.
Such a configuration allows the magnetic material to flow easily in the pipe.

In a preferred form of the invention, the heat exchanger is removably provided to the electric motor.
Such a configuration can improve the handling performance of the heat exchanger.

The present invention is an electric motor provided with the heat exchanger.
Such a configuration makes it possible to provide an electric motor with high cooling performance.

The present invention is a vehicle provided with the electric motor.
With this configuration, it is possible to provide a vehicle with excellent electric motor efficiency, durability, and handling performance. In particular, the heat exchanger is resistant to vibrations and a certain degree of tilt, and the heat exchanger operates in response to the operation of the electric motor, making it compatible with vehicles.

The present invention, which solves the above problems, can provide a heat exchanger that does not inhibit the drive of an electric motor, enables efficient cooling, and has excellent durability and handling performance.

FIG. 1 is a schematic diagram of a heat exchanger according to a first embodiment of the present invention. FIG. 1 is a schematic cross-sectional view of a heat exchanger according to a first embodiment of the present invention. FIG. 1 is a schematic cross-sectional view of a heat exchanger according to a first embodiment of the present invention. FIG. 1 is a perspective view of a heat exchanger according to a first embodiment of the present invention. FIG. 2 is a schematic diagram of a check valve of a heat exchanger according to a first embodiment of the present invention. FIG. 3 is a schematic diagram showing an example of how the heat exchanger is attached according to the first embodiment of the present invention. FIG. 3 is a schematic cross-sectional view of a heat exchanger according to a second embodiment of the present invention. FIG. 3 is a perspective view of a heat exchanger according to a third embodiment of the present invention.

Hereinafter, heat exchangers according to each embodiment of the present invention will be described using the drawings. The description will be detailed in the order of the configuration of the embodiment, the method of implementation, and other examples.
In addition, each embodiment shown below is an example of this invention, and this invention is not limited to each following embodiment.

≪First embodiment≫
As shown in FIG. 1, the heat exchanger X according to this embodiment includes a motor 1 having a rotating magnetic body inside, a bulk 2 surrounding the motor 1, and an oil cooler 3 connected to the bulk 2. , is provided.
As will be described later, the bulk 2 has a conduit 22 in which a magnetic fluid M1 as a refrigerant M flows.

The motor 1 is a motor having a rotating rotor therein, and is assumed to be a brushless motor such as a servo motor or a stepping motor.
In this embodiment, the motor 1 includes a rotation axis 11 provided at the center of the motor 1, a permanent magnet 12 provided to surround the rotation axis 11, and a plurality of stators provided at equal intervals around the rotation axis 11. 13, and a controller 14 that supplies power to the stator 13 at a predetermined timing.
Further, the case of the motor 1 is desirably made of a thin non-ferrous metal or resin that is difficult to shield magnetic force.

The rotation axis 11 is an iron core portion provided at the center of the motor 1, and protrudes from the motor 1 to output rotational power to the outside. A plurality of bearings are provided inside the motor 1 to support the rotation axis 11 and fix its position.

The permanent magnet 12 functions as a rotor by surrounding the rotation axis 11 and being fixed in the direction in which the rotation axis 11 rotates. Further, the permanent magnet 12 is divided into a plurality of magnets, and the magnets having different polarities are arranged adjacent to each other. In addition, in the drawings, the difference in polarity is expressed by the difference in the hatching direction.
In this embodiment, as shown in FIG. 2, the rotational axis 11 is provided so as to be surrounded by four permanent magnets 12, and the adjacent permanent magnets 12 are arranged such that the polarity of the magnetic force directed toward the outer circumference is different from each other. be.

The stator 13 is provided on the inner peripheral surface of the case of the motor 1 as an electromagnet whose magnetic force can be controlled. That is, the stator 13 is configured by winding a wire 132, which is a conductor, around a winding core 131.
In this embodiment, the stators 13 are arranged at equal intervals, and in this embodiment, six (three pairs) stators 13 are provided within the circumference formed by the case.
Further, a Hall element (not shown) is provided at a predetermined position of the stator 13, so that the position of the permanent magnet 12 can be confirmed by the generated induced current.

The winding core 131 is an iron core member provided on the inner peripheral surface of the case of the motor 1, and is preferably provided integrally with the case. The winding core 131 protrudes from the inner circumferential surface toward the inside of the motor 1, and has an anchor-like shape with its end portion extending in the circumferential direction. This makes it difficult for the wound wire 132 to come off.

The wire rods 132 are copper wires wound around the winding core 131, and are electrically connected to the controller 14, respectively. Further, the wire rod 132 of the stator 13 located at the opposing position is electrically connected to the opposing stator 13 so as to have the same magnetism.

When the Hall element detects that the permanent magnet is at a predetermined position, the controller 14 supplies an appropriate current to the wire 132 as described later. That is, the magnetic force emitted by the stator 13 is controlled so that the permanent magnet rotates in one direction.

As shown in FIG. 4, the bulk 2 is a member that fits around the outer peripheral surface of the motor 1, and functions as a so-called water jacket. The bulk 2 includes an outer ring portion 21 into which the motor 1 is fitted, and a conduit 22 through which the refrigerant M flows inside the bulk 2.
On the other hand, the bulk 2 may be configured integrally with the motor 1, or may be configured such that the outer ring portion 21 is not provided and the conduit 22 is incorporated inside the motor 1.

The outer ring part 21 is an annular member made of a material with high thermal conductivity such as thin metal, and has an inner diameter that is approximately the same as the outer diameter of the motor 1, so that the motor 1 can be fitted into the outer ring part 21. It is configured so that it can be done. The outer ring portion 21 is provided with a heat absorption pipe 221, which will be described later, and is configured to receive heat released from the motor 1.

The conduit 22 is a conduit made of thin metal, resin, or the like with a small magnetic shielding effect and high thermal conductivity, and is a component that encloses a refrigerant M inside, thereby enabling exchange of heat. . The pipe line 22 includes a heat absorption pipe line 221 that absorbs heat from the motor 1, a heat radiation pipe line 222 that releases heat to the oil cooler 3, and a connection pipe line 223 that connects the heat absorption pipe line 221 and the heat radiation pipe line 222. are connected in an oil-tight manner, and a check valve 23 may be provided in the middle of the pipe line 22. Note that in the drawings, the thickness of the conduit 22 is not shown for simplification.

In this embodiment, the coolant M is a magnetic fluid M1.
The magnetic fluid M1 is a substance in which fine particles (1 nm to 100 μm) of ferromagnetic or paramagnetic material are dispersed in a liquid, and it reacts to magnetic force and remains in a liquid state or becomes a semi-solid state. It acts like it's being drawn in.
The magnetic fluid M1 does not need to fill the inside of the conduit 22, but is preferably enclosed together with a small amount of air or a non-magnetic fluid M2 that is separated from the magnetic fluid to facilitate flow. Particularly preferably, the density of the non-magnetic fluid M2 is approximately the same as that of the magnetic fluid M1, so that they can easily influence each other due to their flow.

As shown in FIGS. 2 and 3, the heat absorption pipe line 221 is provided so as to substantially closely surround the side surface of the motor 1 via the outer ring portion 21. That is, it is provided so as to surround the rotation axis of the rotation axis 11, and thereby acts appropriately on the magnetic fluid M1 inside the heat absorption pipe line 221.
Preferably, the heat absorption pipe 221 is provided directly above and surrounding the stator 13 . As a result, the magnetic force generated from the stator 13 can be strongly received, thereby increasing the cooling effect.

The heat radiation pipe line 222 is attached to the oil cooler 3, as shown in FIG. By providing the heat radiation pipe line 222 so as to reciprocate in the oil cooler 3 a plurality of times, the heat accumulated in the magnetic fluid M1 can be efficiently discharged.

As shown in FIG. 5, the connection pipe 223 includes a supply connection pipe 224 that supplies refrigerant M from the heat radiation pipe 222 to the heat absorption pipe 221, and a supply connection pipe 224 that supplies the refrigerant M from the heat absorption pipe 221 to the heat radiation pipe 222. and a discharge connection pipe 225 for carrying out.
The conduit 22 is connected such that these members communicate in one direction.

In this embodiment, a so-called Tesla valve 231 is provided as the check valve 23. This makes it possible to prevent the magnetic fluid M1 from flowing backwards without providing any new movable parts.
Preferably, the installation position of the Tesla valve 231 is a position close to the endothermic pipe 221 in the discharge connection pipe 225. This can prevent backflow caused by the sixth stator 13W', which will be described later, drawing the magnetic fluid M1.

Furthermore, as shown in FIG. 5(b), the check valve 23 may be a switch 232 that responds to magnetic force. That is, although it is normally in an open state, when the sixth stator 13W', which will be described later, generates magnetic force, the switch 232, which is a paramagnetic material, closes to prevent backflow.
Note that the check valve 23 is not limited to the above position, but may be provided anywhere. For example, the check valve 23 may be attached to the supply connection pipe line 224 as well, or the check valve 23 may be bent in the middle of the heat absorption pipe line 221.

Fins 24 may be provided on the outer peripheral surface of the bulk 2, as shown in FIG. The fins 24 are a plurality of thin plate-shaped members that contact the outer peripheral surface of the bulk 2 and protrude in the radial direction. In this embodiment, adjacent thin plates are connected at their ends to form a truss. . This increases the surface area of the bulk 2, allowing efficient heat exchange here as well.

The flow of the magnetic fluid M1 inside the endothermic pipe line 221 will be described below with reference to FIGS. 2 and 3.
2 and 3 show schematic cross-sectional views of the motor 1 to which the bulk 2 is attached, and the state changes in the order of FIG. 2(a), FIG. 2(b), and FIG. 3.
There is. Here, adjacent stators 13 are referred to as a first stator 13U, a second stator 13V, and a third stator 13W, and stators provided at positions facing these are respectively a fourth stator 13U', a fifth stator 13V', and a sixth stator 13W. It is assumed that the stator is 13W'. The opposing stators are made to have the same magnetism. Of these, the one closest to the supply connection pipe 224 is the first stator 13U, and the one closest to the discharge connection pipe 225 is the sixth stator 13W'.

In the state shown in FIG. 2(a), magnetic force is generated in the first stator 13U, second stator 13V, fourth stator 13U', and fifth stator 13V', which causes the permanent magnet 12 to rotate clockwise. let
Here, each stator generates a leakage magnetic flux in the outer circumferential direction, and draws the magnetic particles M3 flowing inside the pipe line 22 as shown by the arrow in the figure. At this time, in particular, the first stator 13U acts to draw in the magnetic fluid M1 from the supply connection conduit 224, and induces a counterclockwise flow within the conduit 22.

Next, when the motor 1 transitions to the state shown in FIG. Generates a clockwise rotating action.
Also in this case, each stator generates leakage magnetic flux in the outer circumferential direction, and the magnetic particles M3 flowing inside the pipe line 22 are attracted as shown by the arrows in the figure. At this time, the second stator 13V and the fifth stator 13V' act to attract the magnetic fluid M1 located directly above the first stator 13U and the fourth stator 13U', which are no longer under the influence of leakage magnetic flux. A counterclockwise flow is created in the conduit 22.

Next, when the motor 1 transitions to the state shown in FIG. Generates a rotating action.
Also in this case, each stator generates leakage magnetic flux in the outer circumferential direction, and the magnetic particles M3 flowing inside the pipe line 22 are attracted as shown by the arrows in the figure. At this time, the third stator 13W and the sixth stator 13W' act to attract the magnetic fluid M1 located directly above the second stator 13V and the fifth stator 13V', which are no longer under the influence of leakage magnetic flux. A counterclockwise flow is created in the conduit 22.

By repeating such actions, the magnetic fluid M1 flows in the pipe line 22 in one direction.
It should be noted that although the leakage magnetic flux causes a partial effect of attracting the magnetic fluid M1 clockwise, the magnetic fluid M1 directly above the first stator 13U does not receive the effect of the sixth stator 13W'. The occurrence of such a flow is prevented by the check valve 23 provided nearby, and the area where leakage magnetic flux is generated changes counterclockwise, so that the overall flow is counterclockwise. Become.

The oil cooler 3 is a member that comes into close contact with the heat radiation pipe line 222, and in this embodiment, as shown in FIG. 6, it is provided at the tip of the vehicle B in the traveling direction. Thereby, by taking in airflow from the outside during running, heat exchange of the fluid flowing into the heat radiation pipe 222 is performed.
Preferably, the oil cooler 3 is provided at a position close to the bulk 2 and at approximately the same height as the bulk 2. This makes it possible to generate a flow of appropriate strength even if the flow pressure and velocity are low.

Hereinafter, a method of implementing the present invention will be described in detail using the drawings. The present invention is implemented by a user who cools a motor 1 attached to a vehicle B. Further, the implementation method shown below is an example, and the implementation method is not limited to this, and the order may be changed.

First, the user attaches the motor 1 by fitting it into the bulk 2, as shown in FIG.
Next, the user generates a predetermined leakage magnetic flux by driving the motor 1, causing the flow of the refrigerant M inside the pipe 22.
This allows the user to provide a heat exchanger that does not impede the drive of the electric motor and that utilizes leakage magnetic flux, which is normally preferable to eliminate, for efficient cooling, and that is highly durable. become able to.

≪Second embodiment≫
A second embodiment of the present invention will be described below using FIG. 7. Note that the same components as in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.
The invention according to this embodiment includes a motor 1 having a rotating magnetic body therein, and a bulk 2 surrounding the motor 1. FIG. 7 shows a schematic cross-sectional view of the bulk 2 according to this embodiment attached to the motor 1.

The bulk 2 includes an outer ring portion 21 on the inner peripheral surface into which the motor 1 is fitted, a conduit 22 through which the refrigerant M flows inside the bulk 2, and a plurality of fins 24 provided on the outer peripheral surface.
Here, a refrigerant M is sealed inside the pipe line 22.

The coolant M includes a non-magnetic fluid M2, and a plurality of magnetic particles M3 and non-magnetic particles M4.
The non-magnetic fluid M2 is oil that fills the inside of the pipe line 22.
Further, it is assumed that the magnetic particles M3 are made of a magnetic material such as an iron ball, and the non-magnetic particles M4 are made of a non-magnetic material such as brass or aluminum. It is preferable that these particles have approximately the same overall density as the non-magnetic fluid M2 by providing a cavity therein, so that the flow inside the conduit 22 can be made smooth.

The magnetic particles M3 are particles that move due to being attracted by the leakage magnetic flux, and are sealed inside the conduit 22 with appropriate weight and volume to cause a flow that causes the non-magnetic fluid M2 to flow.
The shape of the particles is assumed to be prismatic, pyramidal, polyhedral, or spherical, and the particle size may be any shape as long as it is smaller than the inner diameter of the conduit 22, and may be powder.
The non-magnetic grains M4 are grains having substantially the same shape as the magnetic grains M3 and have no magnetism.

In this embodiment, both the magnetic particles M3 and the non-magnetic particles M4 are spherical members spread inside the pipe line 22, and the diameter thereof is smaller than the inner diameter of the pipe line 22. It is set so that it is larger than half of the This makes it possible to arrange the magnetic grains M3 and the non-magnetic grains M4 at regular intervals, and to apply leakage magnetic flux appropriately. Preferably, the inner diameter of the conduit 22 is about 0.1 to 3 mm smaller.
In addition, as shown in FIG. 7, the magnetic grains M3 are arranged in alignment in the length corresponding to the region where the leakage magnetic flux of the two stators 13 acts, and the non-magnetic grains M4 are arranged in other regions. arranged and arranged.

The bulk 2 is composed of an outer ring part 21 that is attached to the motor 1 on the inner peripheral surface, a pipe line 22 through which the refrigerant M flows inside, and fins 24 that are attached to the outer peripheral part.

The outer ring part 21 is a member attached to the peripheral surface of the motor 1, and as described later, a magnetic shielding part 211 having a magnetic shielding effect is provided between the heat absorption pipe line 221 and the heat radiation pipe line 222, This prevents the influence of leakage magnetic flux from reaching the heat radiation pipe line 222.

The pipe line 22 has a heat absorption pipe line 221, a heat radiation pipe line 222, and a connecting pipe line 223. The pipe line 22 has a heat absorption pipe line 221 that absorbs heat from the motor 1, and a heat radiation pipe that releases heat to the oil cooler 3. The pipe 222 and a connecting pipe 223 that connects the heat absorption pipe 221 and the heat radiation pipe 222 are connected in an oil-tight manner.
Preferably, a groove is provided inside the conduit 22 to guide the traveling direction of the magnetic particles M3 and the non-magnetic particles M4.

The heat radiation pipe line 222 is provided outside the heat absorption pipe line 221 that is provided around the motor 1 so as to surround the outer periphery of the outer ring part 21 .

In this embodiment, the connecting pipe line 223 is provided so as to connect the heat absorption pipe line 221 and the heat radiation pipe line 222 by extending in the radial direction of the motor 1. As a result, the conduit 22 has a shape that surrounds the motor 1 in a double manner.

Hereinafter, the flow of the refrigerant M inside the pipe line 22 will be explained using FIG.
In FIG. 7(a), each stator of the motor generates leakage magnetic flux in the outer circumferential direction in substantially the same manner as in FIG. 3. As a result, the magnetic particles M3 flowing inside the pipe line 22 are attracted in the direction of the arrow in the figure. At this time, the first stator 13U attracts the magnetic particles M3 located in the connecting pipe line 223, and the third stator 13W and the sixth stator 13W' attract the second stator 13V, which is no longer under the influence of leakage magnetic flux. By acting to attract the magnetic particles M3 located directly above the fifth stator 13V', the magnetic particles M3 move counterclockwise in the pipe line 22.

In the case of FIG. 7(b), each stator of the motor generates leakage magnetic flux in the outer circumferential direction in substantially the same manner as in the case of FIG. 2(a). As a result, the magnetic particles M3 flowing inside the pipe line 22 are attracted in the direction of the arrow in the figure. At this time, the first stator 13U attracts the magnetic particles M3 located in the connecting pipe line 223, and the fourth stator 13U' attracts the magnetic particles M3 located directly above the third stator 13W, which is no longer under the influence of leakage magnetic flux. By acting to attract the particles M3, the magnetic particles M3 move counterclockwise inside the pipe 22.
Preferably, the non-magnetic particles M4 are arranged so that the permanent magnet 12 and the magnetic particles M3 rotate in synchronization with each other.

By repeating such action, the magnetic particles M3 move counterclockwise in the conduit 22, and the non-magnetic fluid M2 flows counterclockwise accordingly. In this embodiment, since the non-magnetic grains M4 are provided between the magnetic grains M3, it is easier to operate more appropriately.
It should be noted that although the leakage magnetic flux causes a partial effect of attracting the magnetic grains M3 clockwise, in addition to the effect described in the first embodiment, in this embodiment, the magnetic particles M3 are attracted to each other in a clockwise direction. The magnetic particles M4 are now directly above the magnetic particles M3, and the effect of moving the magnetic particles M3 clockwise becomes difficult to reach.

The fin 24 is a metal member that has a wide surface area relative to the outside air to promote heat radiation, and is provided on the heat radiation pipe 222 or provided on the outer peripheral surface of the outer ring portion 21 in close proximity to the heat radiation pipe 222. Further, they are connected through a substance with high thermal conductivity.

In addition, in the second embodiment, the magnetic shielding part 211 is not provided, the connecting pipes 223 are crossed, and the heat-absorbing pipe 221 and the heat-radiating pipe 222 at the opposing position are connected, so that the inner side of the heat-radiating pipe 222 is It is also possible to adopt a configuration in which the magnetic particles M3 are rotated by the influence of leakage magnetic flux.

A user fits and attaches the motor 1 to the bulk 2 and drives the motor 1 to generate a predetermined leakage magnetic flux and cause the flow of the refrigerant M inside the pipe 22.
This allows the user to provide a heat exchanger that not only enables efficient cooling but also has excellent durability. Furthermore, in this embodiment, the length of the pipe line 22 is shortened to reduce the overall size, and changes in the height of the pipe line 22 are minimized, thereby enabling efficient heat transport.

《Third embodiment》
A third embodiment of the present invention will be described below using FIG. 8. Note that the same components as in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.
The heat exchanger X according to the present embodiment includes a motor 1 having a rotating magnetic body therein, and a pipe line 22 surrounding the motor 1. That is, the conduit 22 directly surrounds the motor 1 . FIG. 8 shows a perspective view of the conduit 22 according to this embodiment attached to the motor 1.

The pipe line 22 has a heat absorption pipe line 221, a heat radiation pipe line 222, and a connection pipe line 223. Here, the heat absorption pipe line 221 has some flexibility and is provided by being wound directly around the outer peripheral surface of the case of the motor 1. This reduces the distance between the heat absorption pipe line 221 and the stator 13, making it easier to capture leakage magnetic flux.

In the embodiment shown in FIG. 8A, the endothermic pipe line 221 surrounds the side surface of the motor 1 by winding around it in a coil shape. This increases the contact area between the motor 1 and the heat absorption pipe line 221 to improve the heat absorption efficiency, and also increases the amount of leakage magnetic flux from the motor 1 and allows the internal magnetic material to flow more efficiently. I can do it. Note that the endothermic pipe line 221 may be wound around the rotation axis 11 of the motor 1 at an angle.

In the embodiment shown in FIG. 8(b), there are a plurality of heat absorption pipes 221 that wrap around the side surface of the motor 1, a heat radiation pipe 222 having a larger diameter than the heat absorption pipes 221, and a flow that flows into the heat radiation pipe 222. It is composed of a supply connection pipe 224 that divides and connects the refrigerant M to a plurality of heat absorption pipes 221 and a discharge connection pipe 225 that joins the refrigerant M flowing in the plurality of heat absorption pipes 221 and connects it to the heat radiation pipe 222. has been done. This increases the contact area between the motor 1 and the heat absorption pipe line 221 to improve the heat absorption efficiency, and also increases the amount of leakage magnetic flux from the motor 1 and allows the internal magnetic material to flow more efficiently. I can do it. Note that the heat absorption pipe line 221 may have a flat shape with respect to the outer peripheral surface of the motor 1.

As shown in FIG. 8, the user fits and attaches the motor 1 to the inside of the cylinder formed by the conduit 22, and drives the motor 1 to generate a predetermined leakage magnetic flux, thereby discharging the refrigerant M inside the conduit 22. cause a flow. This allows the user to provide a heat exchanger that not only allows efficient cooling of the motor 1 but also has excellent durability. Furthermore, in this embodiment, since the attachment portion of the heat-absorbing pipe 221 can be deformed, it becomes easier to fit in, and the adhesion can be improved to improve heat exchange efficiency.

Note that the configuration may be such that each element described in the first to third embodiments is extracted as appropriate and combined.

1 Motor 11 Rotation axis 12 Permanent magnet 13 Stator 131 Wound core 132 Wire 14 Controller 2 Bulk 21 Outer ring 211 Magnetic shielding section 22 Pipe 221 Heat absorption pipe 222 Heat radiation pipe 223 Connection pipe 224 Supply connection pipe 225 Discharge Connection pipe 23 Check valve 231 Tesla valve 232 Switch 24 Fin 3 Oil cooler M Refrigerant M1 Magnetic fluid M2 Non-magnetic fluid M3 Magnetic particles M4 Non-magnetic particles X Heat exchanger

Claims (8)

A heat exchanger provided in a motor equipped with a magnet that rotates around a rotation axis,
comprising a conduit surrounding the rotation axis,
A heat exchanger having a magnetic material inside the pipe line. The conduit has a check valve that controls flow within the conduit,
The heat exchanger according to claim 1, wherein the check valve is provided close to the motor. The conduit has a check valve that controls flow within the conduit,
The heat exchanger according to claim 1 or 2, wherein the check valve is a Tesla valve. The heat exchanger according to any one of claims 1 to 3, wherein the magnetic body is a sphere. The heat exchanger according to claim 1, wherein the magnetic material is a magnetic fluid. The heat exchanger according to any one of claims 1 to 5, wherein the heat exchanger is removably provided to the motor. An electric motor provided with the heat exchanger according to any one of claims 1 to 6. A vehicle provided with the electric motor according to claim 7.