JPH09140098A - Cooling device of dynamo-electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dynamo-electric machine wherein the temperature rise and local hot point of its rotor field winding are suppressed and uniformed, cooling its rotor field winding by a heat pipe to make the reduction of its size possible. SOLUTION: A cooling device for absorbing the heat generated from a rotor yoke 8 and rotor field winding 9 of a dynamo-electric machine by thin-plate-form heat pipe 13 interposed between the rotor field winding 9 and a coil bracket 12 to cool the yoke 8 and winding 9, wherein after a coolant evaporated in the heat pipe 13 in case of its heat absorption is moved to the end portion of the heat pipe 13 by a pressure difference, the vapor of the coolant is exposed to the cooling wind by the rotations of both a ventilation fan 5 and the rotor of the rotating machine in the protruding portion of the heat pipe 13 to radiate its heat and be liquidized, and then, the liquidized coolant flows circularly through the heat generation portion of the rotor field winding 9 by the capillary force of a wick provided in the heat pipe 13 to cool again the rotor field winding 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device for a rotating electric machine that uses a heat pipe for cooling a rotor.

[0002]

2. Description of the Related Art A conventional open type electric rotating machine will be described with reference to FIG. In the figure, 1 is an open frame, 2 is a stator core formed by stacking silicon steel plates, 3 is a stator winding, 4 is a rotor shaft, 5 is a ventilation fan fitted and arranged on the rotor shaft 4,
6 is a bracket, 7 is a bearing, 8 is a rotor core, 9 is a field winding, 10 is a ventilation duct provided in the stator core, 11
Is cooling air that is sucked into the machine by the ventilation fan 5 and cools each part of the rotating electric machine.

When such a rotary electric machine is operated, heat generated from the stator core 2, the stator winding 3, the rotor core 8 and the field winding 9 is sucked into the machine by the operation of the ventilation fan 5. It is discharged to the outside by the cooling air 11. Normal,
In order to enhance the cooling effect, the stator core 2 is provided with a ventilation duct 10 as shown.

[0004]

In the conventional rotary electric machine having the above-mentioned structure, the ventilation fan 5 sucks the cooling air 11 into the machine. Cooling of the rotor is performed by passing cooling air 11 through a field winding 9 wound around a lumped iron core 8 which is a rotor iron core, but a plurality of coil brackets for fixing the windings are provided between the rotor iron cores. Individually provided to prevent ventilation,
Further, there is a problem that the cooling condition of the rotor is poor because the cooling air 11 is difficult to enter in the axial direction of the rotor rotating at high speed, and the temperature of the field winding 9 rises more than expected.

The present invention has been made to solve the above problems, and its object is to suppress the temperature rise and local hot point of the field winding by using a heat pipe for cooling the rotor field winding. The object of the present invention is to provide a rotating electric machine that can be downsized by making it uniform.

[0006]

In order to achieve the above object, the first aspect of the present invention is to provide a lump iron core arranged on the outer periphery of a rotary shaft and a field winding provided on the outer periphery of the lump iron core. Of a rotating electric machine, in which a fan is provided to cool a rotor including a rotor, a stator including a stator core disposed on the outer periphery of the rotor through a gap, and a stator winding housed in the stator core with a fan. In the device, disposed between the field winding of the rotor and the coil bracket that holds the field winding,
A thin plate-shaped heat pipe in which a refrigerant that absorbs the generated heat is enclosed, and one or both of the heat pipes in the axial direction are projected from the field winding, and the heat generated from the field winding is the heat. It is characterized in that heat is radiated from the protruding portion of the pipe.

According to a second aspect of the present invention, in the cooling device for a rotating electric machine according to the first aspect, the shape of the heat pipe inserted between the rotor field winding and the coil bracket is V-shaped.
Characterized by the character shape.

According to a third aspect of the present invention, in the cooling device for a rotating electric machine according to the first aspect, a heat radiating fin is attached to a heat radiating portion of the heat pipe axially protruding from the field winding, or a plurality of heat radiating fins are attached. The heat pipes are connected by heat radiation fins.

According to a fourth aspect of the present invention, in the cooling device for a rotating electric machine according to the first aspect, the ventilation fan that ventilates the rotor and the stator is made of a high heat conductive material such as aluminum, and the rotor field winding. The heat pipe inserted between the wire and the coil bracket and the ventilation fan are connected to each other and used as a heat radiating portion.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of the present invention.
2) is a plan view of the rotor shown in FIG.
FIG. 2B is a sectional view in the axial direction of FIG.

In the figure, 1 is an open frame, 2 is a stator core formed by laminating silicon steel plates, 3 is a stator winding, 4 is a rotor shaft, 5 is a ventilation fan fixed to the rotor shaft 4, 6 Is a bracket, 7 is a bearing, 8 is a massive rotor iron core laminated with silicon steel plates, 9 is a field winding, 10 is a ventilation duct, and 11 is cooling air which is sucked into the machine by a ventilation fan 5 and cools each part of the rotating electric machine. , 12 is a coil bracket for holding the field winding 9, 13 is a rotor field winding 9 and a coil bracket 12
Is a thin plate-shaped heat pipe that is disposed between the field winding 9 and the end portion so as to project from the field winding 9 in the axial direction.

When the rotating electric machine of this embodiment operates, heat is generated from the rotor core 8 and the field winding 9. This heat is absorbed by the thin plate heat pipe 13 arranged between the field winding 9 and the coil bracket 12, and the field winding 9 and the rotor core 8 are cooled. The refrigerant in the heat pipe 13 evaporates when absorbing heat and moves to the end of the heat pipe 13 due to the pressure difference. The protruding portion of the heat pipe 13 is a ventilation fan 5.
Also, the refrigerant vapor that has been exposed to the cooling wind caused by the rotation of the rotor and has moved to the end of the heat pipe 13 radiates heat and is liquefied. The liquefied refrigerant is returned to the heat generating portion of the field winding 9 by the capillary force of the wick provided in the heat pipe 13, and cools the field winding 9 again.

As described above, by disposing the thin plate-shaped heat pipe in which the refrigerant for absorbing the generated heat is enclosed between the rotor field winding and the coil bracket, the rotor and the field winding are separated from each other. The generated heat is absorbed, and the heat is radiated from the heat dissipation portion protruding from the field winding. The heat pipe can cool the field winding and can even out the temperature in the axial direction.

Therefore, since the heat generated by the rotor is cooled by the heat pipe 13, the temperature rise of the field winding 9 can be suppressed and the temperature of the field winding 9 can be made uniform, and It can be miniaturized or increased in capacity.

FIG. 3 (a) is a plan view of a rotor of a second embodiment (corresponding to claim 2) of the present invention, and FIG. 3 (b) is an axial sectional view of FIG. 3 (a). In the figure, 13 is a V-shaped heat pipe that matches the shape of the field winding 9 between the rotor cores 8. By disposing the V-shaped thin plate heat pipe having an included angle matching the shape of the field winding of the rotor between the field winding and the coil bracket in this way, Both field windings 9
Can be cooled and the temperature in the axial direction can be made uniform. By making the shape of the heat pipe 13 V-shaped as described above, heat can be efficiently absorbed from both field windings between the rotor cores 8 and a high cooling effect can be obtained.

FIG. 4 is a perspective view of a heat pipe heat radiating portion according to a third embodiment (corresponding to claim 3) of the present invention. In the figure, 13 is a heat pipe, and 14 is a radiation fin. The cooling effect can be enhanced by providing the radiation fins 14 on the heat radiation portion of the heat pipe. Since the heat radiation fins 14 using the high heat conductive material are installed in the heat radiation portion of the heat pipe 13, the performance of the heat pipe 13 can be improved.

FIG. 5 is a perspective view of a heat pipe heat radiation portion according to a fourth embodiment (corresponding to claim 3) of the present invention. In the figure, 13 is a heat pipe and 14 is a radiation fin. The cooling effect can be enhanced by providing the heat radiation fins 14 in the heat radiation portion of the heat pipe or by connecting a plurality of heat pipes with cooling fins. Since the heat radiation fins 14 using the high heat conductive material are installed in the heat radiation portion of the heat pipe 13, the performance of the heat pipe 13 can be improved.

FIG. 6 is a sectional view of a rotary electric machine according to a fifth embodiment (corresponding to claim 4) of the present invention. In the figure, a material having high thermal conductivity is used for the ventilation fan 5, and the heat pipe 13 is connected to the ventilation fan 5. With this configuration, the heat generated from the field winding 9 is absorbed by the heat pipe 13 and is radiated by the ventilation fan 5. As described above, the high heat conductive material is used as the material of the ventilation fan 5, and the heat pipe 13
By extending and connecting the fan to the ventilation fan 5 in the axial direction, the ventilation fan 5 also serves as a radiation fin, so that the cooling effect can be enhanced. Therefore, the area of the heat radiating portion can be increased, the performance of the heat pipe can be improved, and a higher cooling effect can be obtained.

[0019]

As described above, according to the present invention,
A thin plate-shaped heat pipe containing a refrigerant that absorbs the heat generated is placed between the rotor field winding and the coil bracket that holds the winding, and the heat pipe heat radiating section is axially wound into the field winding. The temperature rise of the rotor field winding is suppressed by cooling the rotor by projecting it from the wire and radiating the heat generated from the field winding from the heat pipe protruding part, and The temperature in the axial direction can be made uniform, and the size or capacity of the rotating electric machine can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view of a first embodiment of the present invention.

2 (a) is a plan view of the rotor of FIG. 1, and FIG. 2 (b) is a sectional view of FIG. 2 (a).

3 (a) is a plan view of a rotor according to a second embodiment of the present invention, and FIG. 3 (b) is a sectional view of FIG. 3 (a).

FIG. 4 is a perspective view of a heat pipe radiator according to a third embodiment of the present invention.

FIG. 5 is a perspective view of a heat pipe radiator according to a fourth embodiment of the present invention.

FIG. 6 is a sectional view of a fifth embodiment of the present invention.

FIG. 7 is a cross-sectional view of a conventional open-type rotating electric machine.

[Explanation of symbols]

1 ... Open type frame, 2 ... Stator core, 3 ... Stator winding, 4 ... Rotor shaft, 5 ... Ventilation fan, 6 ... Bracket,
7 ... Bearing, 8 ... Rotor core, 9 ... Field winding, 10 ... Ventilation duct, 11 ... Cooling air, 12 ... Coil bracket, 13
… Heat pipes, 14… Radiation fins.

Claims (4)

[Claims] 1. A rotor composed of a lump iron core arranged on the outer circumference of a rotary shaft, a field winding provided on the outer circumference of the lump core, and a rotor arranged on the outer circumference of the rotor with a gap therebetween. In a cooling device for a rotating electric machine, which cools a stator comprising a stator iron core and a stator winding housed in the stator iron core with a fan, holding a field winding of the rotor and the field winding. A thin plate-shaped heat pipe that is disposed between the coil brackets and that contains a refrigerant that absorbs the generated heat inside,
One or both of the heat pipes are projected in the axial direction from the field winding, and the heat generated from the field winding is radiated from the protruding portion of the heat pipe. 2. The rotating electric machine cooling device according to claim 1, wherein the shape of the heat pipe inserted between the rotor field winding and the coil bracket is V-shaped. Cooling system. 3. The cooling device for a rotating electric machine according to claim 1, wherein a heat radiating fin is attached to a heat radiating portion of the heat pipe axially protruding from the field winding, or a plurality of heat pipes are radiating fins. A cooling device for a rotating electric machine, characterized in that 4. The cooling device for a rotating electric machine according to claim 1, wherein a ventilation fan that ventilates the rotor and the stator is made of a high heat conductive material such as aluminum, and the rotor field winding and the coil bracket are provided. A cooling device for a rotating electric machine, comprising a heat pipe inserted between the ventilation fan and the ventilation fan, which is used as a heat radiating portion.