JPH05207704A - Electric rotating machine - Google Patents

Abstract

PURPOSE:To obtain a small-sized rotary electric machine having a totally enclosed frame structure by using heat pipes for cooling a stator so as to make any cooling fan and ventilating duct unnecessary. CONSTITUTION:A plurality of heat pipes 14 in which a coolant is enclosed for absorbing the heat generated by a stator iron core 2 are buried in a plurality of outer peripheral grooves formed on the surface of the core 2 and connected to a condenser 16 for cooling the coolant through two short-circuit ring pipes 15 and communicating pipes 17 so that the coolant can be circulated due to the expansion of the heated coolant in the pipes 14 and condensation of the cooled coolant in the condenser 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary electric machine using a heat pipe for cooling a stator.

[0002]

2. Description of the Related Art FIG. 8 is a cross-sectional view showing a conventional open type rotating electric machine. In the figure, 1 is an open type frame, 2 is a stator core made of laminated steel plates, and 3 is made of laminated steel plates. A stator clamper for axially supporting the stator core 2, 4 a stator coil, 5 a rotor shaft, 6 a cooling fan,
The cooling fan 6 is rotated by driving the rotor shaft 5,
Cool the inside of the machine.

Reference numeral 7 is a bracket, 8 is a bearing, 9 is a rotor core, 10 is a rotor coil, 11 is a slip ring, and 12 is a slip ring.
Indicates a flow of cooling air that sucks air into the open frame 1, cools each device, and is discharged to the outside of the open frame 1, and 13 is a ventilation duct provided between the stator cores 2.

Next, the operation will be described. The heat generated from the rotor and the stator by the operation of the rotating electric machine, that is, the heat generated from the rotor core 9, the rotor coil 10, the stator core 2 and the stator coil 4, is as shown by arrows in FIG. The cooling air 12 circulated by the cooling fan 6 is deprived of through the ventilation duct 13 and discharged outside the rotary electric machine.

[0005]

Since the conventional rotary electric machine is constructed as described above, the cooling fan 6 must be provided in order to obtain the cooling air 12, and the space between the stator cores 2 must be provided. Since the ventilation duct 13 must be provided in the above, there is a problem that the structure becomes large. Further, in the high speed rotating electric machine, there is a problem that the mechanical loss of the cooling fan 6 becomes large and the efficiency of the rotating electric machine is lowered. Furthermore, since the cooling air 12 is sucked into the machine and discharged to the outside of the machine, it is not possible to form a fully closed structure, and the open frame 1 must be used, which causes a problem that the inside of the machine is contaminated. It was

The invention of claim 1 has been made in order to solve the above-mentioned problems. A heat pipe is used for cooling the stator, a cooling fan is not required, and a ventilation duct is not required. The object is to obtain a rotating electric machine having a fully closed frame structure.

Further, in addition to the object of the invention of claim 1, the inventions of claims 2, 3 and 4 are to provide a rotating electric machine which has a high cooling efficiency of the stator core and an even cooling effect. And

Further, the invention of claim 5 is a combination of a permanent magnet rotor having no excitation loss and the structure described in the invention of claims 1 to 4, and further, a fully closed frame using a heat pipe. It is an object to obtain a rotating electric machine that can exert a structured effect.

[0009]

According to a first aspect of the present invention, there is provided a rotating electric machine having a plurality of heat pipes, each of which has a plurality of heat pipes in which a refrigerant for absorbing heat generated by a stator core is enclosed. Embedded in, connected to a condenser that cools the refrigerant via a heat pipe and a short-circuiting ring tube and a conducting tube, the refrigerant expands due to the heat absorption of the heat pipe, and the refrigerant condenses due to the cooling of the condenser, thereby circulating the refrigerant. It cools the stator core.

According to a second aspect of the present invention, there is provided a rotating electric machine in which a plurality of outer peripheral grooves are provided on the outer periphery of the stator core so as to correspond to the stator coil which is inclined at a skew angle with respect to the axial direction. A plurality of heat pipes containing a refrigerant that absorbs the generated heat is embedded in a plurality of outer peripheral grooves of the stator core, and a heat pipe and a half-split short-circuit ring pipe and a conducting pipe that are divided into two in the axial direction are provided. It is connected to a condenser that cools the refrigerant through the expansion of the refrigerant due to the heat absorption of the heat pipe and the condensation of the refrigerant by cooling the condenser, so that the refrigerant is divided into two systems on the left and right and the directions of the refrigerant on the left and right are reversed. It circulates to cool the stator core.

In the rotating electric machine according to the invention of claim 3, a plurality of axial holes are provided in the stator core near the stator coil, and a refrigerant for absorbing heat generated by the stator core is sealed inside.
In addition, a plurality of heat pipes made of a good heat conductive insulating material are penetrated through a plurality of axial holes of the stator core.

In the rotating electric machine according to the invention of claim 4, a plurality of axial holes are provided near the stator coil of the stator core, and a refrigerant that absorbs the heat generated from the stator core is sealed inside.
In addition, a plurality of heat pipes coated with a good heat conductive insulating material on a metallic material are passed through the plurality of axial holes of the stator core, and at least one of the plurality of heat pipes and the short-circuit ring pipe is provided. It is connected with an insulated connector.

According to a fifth aspect of the present invention, in addition to the first to fourth aspects of the present invention, a rotating electric machine is provided with a permanent magnet rotor having a field pole of the rotor as a permanent magnet.

[0014]

In the rotating electric machine according to the invention of claim 1, the heat generated by the stator core is absorbed by the coolant by embedding a plurality of heat pipes in which coolant is enclosed in a plurality of outer circumferential grooves of the stator core. Cool the stator core that has generated heat.
Furthermore, by connecting the heat pipe to the condenser via the short-circuit ring pipe and the conducting pipe, and circulating the refrigerant by expansion and condensation, the cooling efficiency of the stator core that has generated heat is further enhanced, and the heat pipe is used inside the machine. The more absorbed heat is released to the outside of the machine by the condenser.

In the rotating electric machine according to the invention of claim 2, the refrigerant is supplied to a plurality of outer peripheral grooves provided on the outer periphery of the stator core, corresponding to the stator coils provided with a skew angle with respect to the axial direction. By embedding multiple heat pipes enclosed inside, the refrigerant evenly absorbs heat from the stator coil, which is the source of heat generation of the stator core, and also improves heat absorption efficiency, cooling the heat-generating stator core. To do. Further, the plurality of heat pipes provided in the plurality of outer peripheral grooves accelerate the flow of the refrigerant due to the inclination of the heat pipes and further enhance the heat transport efficiency. Furthermore, the heat pipe, the half-split short-circuit ring pipe, and the conduction pipe are connected to the condenser, and the refrigerant is circulated to the left and right two systems by expansion and condensation, and the refrigerant in the left and right systems is circulated in the opposite direction. As a result, the stator core that has generated heat is evenly cooled, the cooling efficiency is further enhanced, and the heat absorbed from the inside of the machine by the heat pipe is released to the outside of the machine by the condenser.

In the rotating electric machine according to the third aspect of the present invention, the plurality of axial holes near the stator coil of the stator core are made to penetrate the plurality of heat pipes in which the refrigerant is sealed so that the stator core generates heat. The refrigerant evenly absorbs the heat generated from the stator coil, which is the source of the heat generation, and enhances the heat absorption efficiency to cool the heat-generating stator core. Furthermore, by making the heat pipe material a good heat conductive insulating material, a circulating current that circulates through the heat pipe and the short-circuit ring pipe due to the magnetic influence from the rotor is prevented.

In the rotating electric machine according to the fourth aspect of the present invention, the heat generation of the stator core is achieved by penetrating a plurality of heat pipes in which coolant is enclosed in a plurality of axial holes near the stator coil of the stator core. The refrigerant evenly absorbs the heat generated from the stator coil, which is the source of the heat generation, and enhances the heat absorption efficiency to cool the heat-generating stator core. Furthermore, the material of the heat pipe is a metallic material coated with a good heat conductive insulating material, and by connecting an insulating connector to at least one of the plurality of heat pipes and the short-circuit ring pipe,
It further prevents the circulating current circulating in the heat pipe and the short-circuit ring pipe due to the magnetic influence from the rotor.

The rotating electric machine according to the invention of claim 5 is provided with a permanent magnet rotor in which the field poles of the rotor are permanent magnets, whereby heat generation in the machine due to excitation loss of the rotor is eliminated, and In combination with the configurations of the inventions of claims 1 to 4, the effect of adopting the fully closed frame and cooling the stator core by the heat pipe is further enhanced.

[0019]

EXAMPLES Example 1. An embodiment of the present invention will be described below with reference to the drawings. 1 is a sectional view showing a rotating electric machine according to one embodiment of the invention of claims 1 to 4, and FIG. 2A is a partial plan view showing a stator according to one embodiment of the invention of claim 1. 2 (b) is an axial sectional view of FIG. 2 (a).

In FIGS. 1 and 2, 1a is a fully closed frame for hermetically sealing the inside of the machine, 2 is a stator core having a plurality of outer circumferential grooves, and steel plates are layered, and 3 is a plate steel layered and fixed. A stator clamper that axially supports the child iron core 2.
4 is a stator coil, 5 is a rotor shaft, 7 is a bracket, 8
Is a bearing, and 14 is a plurality of heat pipes embedded in a plurality of outer circumferential grooves of the stator core 2 and having a refrigerant for absorbing heat generated by the stator core 2 enclosed therein.

Numeral 15 is connected to the inlet and outlet of a plurality of heat pipes 14, respectively.
4 are two short-circuiting ring pipes that collect the refrigerant from 4 and distribute the refrigerant to the plurality of heat pipes 14. Reference numeral 16 denotes a condenser which is guided by an electric conduction pipe 17 from the upper portions of the two short-circuit ring pipes 15 and absorbs heat generated by the stator core 2 to cool and condense the expanded refrigerant. In addition, a so-called loop heat pipe is configured to circulate the refrigerant in a closed circuit connected to the condenser 16 through the heat pipe 14, the short-circuit ring pipe 15 and the conduction pipe 17 by the expansion of the refrigerant due to the heat absorption and the condensation due to the cooling. is doing. 18 shows the flow of the refrigerant.

Next, the operation will be described. The heat generated from the stator of the rotating electric machine, that is, the heat generated from the stator core 2 and the stator coil 4 is absorbed by the heat pipe 14 embedded in the stator core 2 and cooled.
When the refrigerant in the heat pipe 14 absorbs the heat of the stator core 2, the refrigerant expands and is collected in the short-circuit ring pipe 15 as shown by the refrigerant flow 18 in FIG.
It flows into 6. The refrigerant that has flowed into the condenser 16 and expanded is cooled and condensed by a heat exchanger (not shown) in the condenser 16. The cooled and condensed refrigerant flows into the rotary electric machine via the conduction pipe 17, is distributed to the plurality of heat pipes 14 by the short-circuit ring pipe 15, and cools the stator core 2 and the stator coil 4 again.

As described above, since the heat pipe 14 is used to cool the stator core 2 and the stator coil 4, the cooling efficiency is good, and the heat absorbed in the machine is released outside the machine. The ventilation duct 13 is not necessary for the cooling fan 6, and the effect is obtained that a rotary electric machine that is small in size and can be used for the fully closed frame 1a and has little pollution.

Example 2. 3A is a partial plan view showing a stator according to an embodiment of the invention of claim 2, FIG. 3B is an axial sectional view of FIG. 3A, and FIG. FIG. 3 is a perspective view showing a condenser according to an embodiment of the present invention.

In FIGS. 3 and 4, 1a is a fully closed frame for sealing the inside of the machine, 2 is a plurality of outer peripheral grooves corresponding to the stator coil 4 which is provided at a skew angle with respect to the axial direction. Is a plurality of heat pipes that are embedded in a plurality of outer circumferential grooves of the stator core 2 and that are filled with a refrigerant that absorbs the heat generated by the stator core 2. 15a and 15b are vertically divided into two parts in the axial direction, and are connected to the inlet and the outlet of a plurality of heat pipes 14a in two left and right systems, respectively, to collect the refrigerant from the plurality of heat pipes 14a and the plurality of heat pipes 14a. It is four half-split short-circuit ring tubes that distribute the refrigerant to.

Reference numeral 16 denotes four half-split short-circuit ring tubes 15a,
A condenser that cools the refrigerant that has been expanded by absorbing the heat generated from the stator core 2 and guided by the conduits 17a and 17b from the upper portion of 15b by the heat exchanger 20 to condense it. It should be noted that the heat pipe 14a and the half-split short-circuit ring pipe 15 are caused by the expansion of the refrigerant due to the heat absorption and the condensation due to the cooling.
A so-called two-loop type heat pipe is constructed in which the refrigerant is circulated in a closed circuit connected to the condenser 16 and two left and right systems via a and 15b and conducting tubes 17a and 17b.
Further, the circulation directions of the refrigerant in the left and right systems are opposite. 18 shows the flow of the refrigerant.

Next, the operation will be described. Generally, when the rotating electric machine is, for example, a generator, if the stator coils are provided in the same direction with respect to the rotation axis, the output waveform obtained from the generator will be a sinusoidal wave with distortion (trapezoid) due to magnetic interference. Becomes Therefore, the stator coil is provided with a skew angle α with respect to the rotation axis to eliminate the distortion of the output waveform due to a magnetic obstacle.

Therefore, in this embodiment, heat pipes are provided in a plurality of outer peripheral grooves provided on the outer periphery of the stator core 2 in correspondence with the stator coil 4 which is provided with a skew angle with respect to the axial direction. Due to the embedding, the heat generated from the stator coil 4, which is the source of heat generation of the stator core 2, is evenly absorbed by the refrigerant enclosed in the heat pipe, and the heat absorption efficiency is improved.

Further, in the plurality of heat pipes provided in the plurality of outer peripheral grooves, the flow of the refrigerant becomes smooth due to the inclination of the heat pipes, the flow of the refrigerant is accelerated, and the heat transfer efficiency is improved. Furthermore, by circulating the refrigerant in the left and right two systems and reversing the circulation directions of the refrigerant in the left and right systems, it is possible to more evenly cool the stator core that has generated heat and to further enhance the cooling efficiency.

Example 3. 5A is a sectional view showing a stator according to an embodiment of the invention of claim 3, and FIG.
It is an axial sectional view of (a).

In FIG. 5, reference numeral 2 denotes a stator core provided with a plurality of axial holes in the vicinity of the stator coil 4, and 14b penetrates a plurality of axial holes of the stator core 2 to generate heat from the stator core 2. The heat pipe 14b is a heat pipe in which a refrigerant that absorbs the generated heat is enclosed. The heat pipe 14b is made of a good heat conductive insulating material such as ceramic.

Next, the operation will be described. In the present embodiment, the heat pipe 14b is pierced through the plurality of axial holes near the stator coil of the stator core 2 so that the heat generated from the stator coil 4 which is the source of heat generation of the stator core 2 is cooled by the refrigerant. Absorbs heat evenly and enhances heat absorption efficiency. Further, the magnetic field generated by the rotor cuts the heat pipe 14b, and due to this action, a circulating current that circulates through the heat pipe 14b and the short-circuit ring pipe 15 flows.
By making the material of b a good heat conductive insulating material such as ceramic, this circulating current is prevented.

Example 4. 6 (a) is a sectional view showing a stator according to an embodiment of the invention of claim 4, and FIG. 6 (b) is FIG.
It is an axial sectional view of (a).

In FIG. 6, reference numeral 2 denotes a stator core provided with a plurality of axial holes near the stator coil 4, and 14c penetrates a plurality of axial holes of the stator core 2 to generate from the stator core. The heat pipe 14c is a heat pipe in which a refrigerant that absorbs heat is enclosed, and the heat pipe 14c is formed by coating a metallic material with a good heat conductive insulating material such as ceramic. 23 is a plurality of heat pipes 14c
And an insulating connector connected between the one short-circuit ring tube 15 and the other.

Next, the operation will be described. In this embodiment, the heat pipe 14c is made of a metallic material coated with a good heat conductive insulating material such as ceramic, and the plurality of heat pipes 14c and one of the short-circuit ring pipes 1 are used.
By connecting the insulation connector 23 between the heat pipe 14 and the rotor 5, the heat pipe 14c is further influenced by the rotor magnetically.
And to prevent a circulating current circulating in the short-circuit ring tube 15.

Example 5. FIG. 7 is a sectional view showing a rotary electric machine according to an embodiment of the invention of claim 5, and in FIG.
Reference numeral 9 is a permanent magnet rotor in which the field pole of the rotor is a permanent magnet.

Next, the operation will be described. Generally, the loss generated from a rotating electric machine includes copper loss, iron loss and stray loss of the stator, excitation loss and mechanical loss of the rotor, but most of these losses are converted to heat. Therefore, with the configurations of Examples 1 to 4, the stator side was cooled, and further, by eliminating the cooling fan, the mechanical loss on the rotor side could be significantly reduced. However, measures against the excitation loss due to the rotor remain, and the excitation loss due to the rotor generates heat and is radiated into the machine. Therefore, in the present embodiment, by combining with the permanent magnet rotor 19 having no excitation loss, the effect of cooling the stator core 2 with a further heat pipe can be exhibited, and an effect that a small rotating electric machine can be obtained is obtained. .. The structure of the permanent magnet rotor 19 is generally well known and will not be described, but it is shown in Japanese Utility Model Publication No. 60-24149 and Japanese Utility Model Publication No. 60-48345.

[0038]

As described above, according to the invention of claim 1, a plurality of outer peripheral grooves are provided in the stator core, and a plurality of heat pipes in which a refrigerant for absorbing the heat generated by the stator core is enclosed. Embedded in a plurality of outer peripheral grooves of the stator core, connected to a condenser for cooling the refrigerant through a plurality of heat pipes and a short-circuit ring pipe and a conduction pipe, expansion of the refrigerant due to heat absorption of the heat pipe, By condensing the refrigerant by cooling,
A structure that circulates a refrigerant to cool the stator core, efficiently cools the stator core that has generated heat with a heat pipe, does not require a cooling fan, does not require a ventilation duct, and is a compact and fully enclosed frame structure. There is an effect that the rotating electric machine can be obtained.

According to the second aspect of the present invention, a plurality of outer peripheral grooves are provided on the outer periphery of the stator core so as to correspond to the stator coil which is provided with a skew angle with respect to the axial direction. A plurality of heat pipes filled with a refrigerant that absorbs the generated heat is embedded in a plurality of outer peripheral grooves of the stator core, and a plurality of heat pipes and a half-split short-circuit ring pipe that is divided into left and right in the axial direction and conduction. Connected to a condenser that cools the refrigerant via a pipe, the refrigerant expands due to the heat absorption of the heat pipe, and the refrigerant condenses due to the cooling of the condenser, so that the refrigerant is divided into two systems on the left and right, and the direction of the refrigerant on the left and right systems is changed. Since the structure is such that the stator core is circulated in the opposite direction to cool the stator core, the heat pipe installed with the skew angle is inclined so that the refrigerant evenly absorbs heat from the stator coil, which is the source of heat generation of the stator core. , And endothermic effect Increase. Further, the inclination of the heat pipe accelerates the flow of the refrigerant and enhances the cooling effect of the stator core. Furthermore, by circulating the flow of the refrigerant in the left and right two systems and in the opposite direction of the flow of the refrigerant in the left and right systems, the stator core is evenly cooled, the cooling effect is further enhanced, and the cooling fan is There is an effect that a rotating electric machine having a fully closed frame structure can be obtained because the ventilation duct is not necessary as well as unnecessary.

Further, according to the invention of claim 3, a plurality of axial holes are provided near the stator coil of the stator core, a refrigerant for absorbing the heat generated from the stator core is sealed inside, and a good heat Since a plurality of heat pipes made of a conductive insulating material is made to penetrate through a plurality of axial holes of the stator core, the heat pipe penetrated near the stator coil is
The refrigerant evenly absorbs the heat generated from the stator coil, which is the source of heat generation of the stator core, and enhances the heat absorption effect. further,
The heat pipe made of a good heat conductive insulating material has an effect of preventing a circulating current circulating through the heat pipe and the short-circuit ring pipe due to a magnetic effect from the rotor and eliminating a loss due to the circulating current.

Further, according to the invention of claim 4, a plurality of axial holes are provided in the stator core near the stator coil, and a coolant for absorbing heat generated by the stator core is sealed inside and a metal is formed. Heat pipe coated with a good heat conductive insulating material on the heat conductive material is passed through the axial holes of the stator core, and at least one of the heat pipe and the short-circuit ring pipe is insulated. Since the heat pipe penetrated near the stator coil, the refrigerant evenly absorbs heat from the stator coil, which is the source of heat generation of the stator core, and enhances the heat absorption effect. Furthermore, the heat pipe, which is a metallic material coated with a good heat conductive insulating material, and the insulating connector prevent the circulating current that circulates in the heat pipe and the short-circuit ring pipe due to the magnetic effect from the rotor, It has the effect of eliminating the loss caused by.

Further, according to the invention of claim 5, in addition to the inventions of claims 1 to 4, the constitution is provided with a permanent magnet rotor in which the field pole of the rotor is a permanent magnet. There is an effect that a rotating electric machine can be obtained which eliminates the generation of heat in the machine due to the excitation loss and further enhances the effect of using the heat pipe to form the fully closed frame structure.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a rotating electric machine according to an embodiment of the present invention.

FIG. 2 (a) is a partial plan view showing a stator according to an embodiment of the present invention. 2 (b) is shown in FIG.
It is an axial sectional view of (a).

FIG. 3 (a) is a partial plan view showing a stator according to an embodiment of the invention of claim 2; 3 (b) is shown in FIG.
It is an axial sectional view of (a).

FIG. 4 is a perspective view showing a condenser according to an embodiment of the present invention.

FIG. 5 (a) is a partial plan view showing a stator according to an embodiment of the invention of claim 3; 5 (b) is shown in FIG.
It is an axial sectional view of (a).

FIG. 6 (a) is a partial plan view showing a stator according to an embodiment of the invention of claim 4; FIG. 6 (b) is shown in FIG.
It is an axial sectional view of (a).

FIG. 7 is a sectional view showing a rotary electric machine according to an embodiment of the invention of claim 5;

FIG. 8 is a cross-sectional view showing a conventional open-type rotating electric machine.

[Explanation of symbols]

 2 Stator core 4 Stator coil 14, 14a, 14b, 14c Heat pipe 15 Short-circuit ring pipe 15a, 15b Half-split short-circuit ring pipe 16 Condenser 17, 17a, 17b Conducting pipe 19 Permanent magnet rotor 23 Insulation connector

Claims (5)

[Claims] 1. A stator core provided with a plurality of outer peripheral grooves, and a plurality of refrigerants, which are embedded in the plurality of outer peripheral grooves of the stator core and which absorb the heat generated by the stator core, are enclosed inside. A heat pipe, a short-circuit ring pipe connected to the inlet and outlet of each of the plurality of heat pipes, for condensing the refrigerant from the plurality of heat pipes and distributing the refrigerant to the plurality of heat pipes, and the short-circuit ring pipe Condensation led by a conducting pipe from the upper part, cooling and condensing the expanded refrigerant by absorbing heat generated from the stator iron core, and circulating the refrigerant through the heat pipe, the short-circuit ring pipe and the conducting pipe. Electric machine equipped with 2. A stator core provided with a plurality of outer circumferential grooves corresponding to a stator coil provided at a skew angle with respect to the axial direction, and a plurality of outer circumferential grooves of the stator core. A plurality of heat pipes embedded with a refrigerant that absorbs heat generated from the stator core, and two inlet and outlet portions of the plurality of heat pipes are respectively connected to left and right systems, and the plurality of heat pipes are connected. A half-split short-circuit ring pipe that is divided into left and right in the axial direction to collect the coolant from the pipe and distribute the coolant to the plurality of heat pipes, and a stator pipe that is guided from above the half-split short-circuit ring pipe by a conduction pipe. The expanded refrigerant is cooled and condensed by absorbing the heat generated, and the refrigerant is circulated in the left and right two systems via the heat pipe, the half-split short-circuit ring pipe, and the conduction pipe, and A rotating electric machine comprising: a condenser in which the circulation directions of the refrigerant in the left and right systems are reversed. 3. A plurality of axial holes are provided near the stator coil of the stator core, and the plurality of heat pipes are passed through the plurality of axial holes of the stator core to generate heat from the stator core. A refrigerant which absorbs heat is enclosed inside and is made of a good heat conductive insulating material.
Or the rotating electric machine according to 2. 4. The stator core is provided with a plurality of axial holes near the stator coil, and the plurality of heat pipes are passed through the plurality of axial holes of the stator core to generate heat from the stator core. A refrigerant that absorbs heat is enclosed inside, and a metallic material is coated with a good heat conductive insulating material, and the plurality of heat pipes and short-circuit rings connected to the plurality of heat pipe inlets and outlets, respectively. The rotary electric machine according to claim 1 or 2, wherein an insulating connector is connected to at least one of the pipe and the pipe. 5. A rotating electric machine according to claim 1, 2, 3 or 4, further comprising a permanent magnet rotor having a field pole of the rotor as a permanent magnet.