JPH10174371A - Cooler of motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small-sized high-output motor by a cooler with efficient stator winding, in a motor which has winding for a stator used generally for industry. SOLUTION: This cooler has a roughly cylindrical stator 101 where windings are installed in a plurality of slots, a frame 110 cylindrical in bore, a resin sheet 103 being an electric insulator and higher in heat conductivity than air and good in elasticity and adhesion, and a heat pipe 109, and one end of the heat pipe 109 is stuck close to the coil end 102 through a resin sheet 103, and the other end of the heat pipe 109 is stuck fast to the internal surface of the frame 110. Then, by conducting the heat generated in the winding to the frame 110 being a heat radiator efficiently, highly efficient cooling is performed, and a small-sized high-output motor can be materialized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to an electric motor used for industry.

[0002]

2. Description of the Related Art In recent years, it has been desired to reduce the size of a motor mounted thereon and to increase the output from the viewpoint of energy saving as well.

[0003] In a small high-output motor, the rated output and the life can be extended by efficiently cooling the heat generated by the motor, and a high-performance motor can be provided.

An example of a conventional motor cooling device will be described below. Conventionally, electric motor cooling devices have been
The one disclosed in JP-A-131170 is known.
FIG. 7 shows a structure of a conventional motor cooling device, in which a heat absorbing portion 71 of a heat pipe 7 is provided in an opening of a plurality of slots opened on an inner periphery of a stator core 2, and a heat radiating portion 7 is provided in a frame 1.
2 were brought into contact and fixed.

[0005] Regarding the electric motor configured as described above,
The operation will be described below.

[0006]

The cooling device for an electric motor has an effect of transmitting heat generated from a rotor to a heat absorbing portion of a heat pipe through a gap to increase the cooling efficiency of the rotor.

However, since the winding, which is the main heat source of the stator, is not directly cooled, the cooling efficiency cannot always be said to be high.

There is another conventional example in which a resin having high thermal conductivity is filled in the vicinity of the windings. However, it is necessary to prevent the resin from flowing to the inner diameter side of the stator until the resin is fixed. In addition, since it is difficult to arrange a necessary amount in a necessary place, there is a problem that the motor becomes heavy due to extra resin that does not achieve the purpose of increasing the thermal conductivity.

As described above, since the cooling efficiency is poor, sufficient cooling to a large output or the like cannot be performed, and it is difficult to increase the rated output, and necessary jigs and equipment for fixing the resin are required. There was a problem of increase.

[0010]

SUMMARY OF THE INVENTION In order to solve this problem, a cooling device for an electric motor according to the present invention comprises a substantially cylindrical stator having windings mounted in a plurality of slots, and rotatably supports and holds the rotor. And a resin sheet with electrical insulation and higher thermal conductivity than air and good elasticity and adhesion, and the resin sheet adheres between the end of the stator winding (coil end) and the bracket. Let it be arranged. Alternatively, a configuration in which a part of the resin sheet is disposed in close contact with a coil end portion and a part of the resin sheet is disposed in close contact with a groove of a frame having a circumferential groove by a substantially ring-shaped spring slightly larger than the inner diameter of the frame. It is.

Thus, the winding end (coil end), which is a main heat source of the stator, is efficiently cooled by a highly conductive resin sheet and a heat pipe having a very high thermal conductivity. A small high-output motor having a high rated output can be obtained.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION
A substantially cylindrical stator having a coil end portion mounted with windings in a plurality of slots and whose ends protrude in the axial direction,
A metal bracket for rotatably supporting the rotor, a resin sheet having a high thermal conductivity than air and a good elasticity and adhesion with air, and the resin sheet is provided between the coil end portion and the bracket. A cooling device for a motor that is closely attached to the motor. The heat generated by the coil end, which is the main heat source of the stator, can be efficiently transmitted to the bracket, which is the heat dissipating part, by a highly conductive resin sheet. Is high.

According to a second aspect of the present invention, there is provided a substantially cylindrical stator having a coil end portion in which a winding is mounted in a plurality of slots and whose ends protrude in the axial direction, and a cylindrical inner diameter. In the form, a metal frame with a circumferential groove, a substantially ring-shaped spring slightly larger than the inner diameter groove of the frame, and a resin sheet with electrical insulation and higher heat conductivity than air and good adhesion A cooling device for an electric motor, wherein a part of the resin sheet is disposed in close contact with the coil end portion, and a part is disposed in close contact with the groove of the frame by the ring-shaped spring. The resin sheet having good conductivity can efficiently transmit the heat to the frame, which is a heat radiating portion, and has an effect of high cooling efficiency.

According to a third aspect of the present invention, there is provided a substantially cylindrical stator having a coil end portion in which a winding is mounted in a plurality of slots and whose ends protrude in the axial direction, and a cylindrical inner diameter. A metal frame, a resin sheet made of an electrically insulating material having a higher thermal conductivity than air and having good elasticity and adhesion, and a heat pipe. The heat pipe is provided at the coil end portion via the resin sheet. This is a cooling device for an electric motor in which one end of the heat pipe is placed in close contact with the other end of the heat pipe so as to be in close contact with the inner surface of the frame. The high heat pipe has the effect that the heat can be efficiently transmitted to the frame, which is the heat radiating portion, and the cooling efficiency is high.

According to a fourth aspect of the present invention, one end of the heat pipe is brought into close contact with the coil end portion via a resin sheet, and the other end of the heat pipe is positioned above the end of the coil end portion. 4. The cooling device for an electric motor according to claim 3, wherein the internal heat transfer material is moved by providing the main heat generation of the stator with a resin having good conductivity and a heat radiating portion being higher than the heat absorbing portion. A good heat pipe having a very high thermal conductivity can efficiently transmit the heat to the frame, which is a heat radiating portion, and has an effect of high cooling efficiency.

The invention according to claim 5 of the present invention is the electric motor cooling device according to claim 3 or 4, wherein the heat pipe is disposed at a position not protruding in the axial direction from the coil end. By placing a high heat pipe below the coil end height, the main heat generation of the stator can be controlled by a resin with good conductivity and a heat with very high thermal conductivity without increasing the axial length of the motor. The pipe has a function of efficiently transmitting the heat to the frame, which is a heat radiating portion, and has a high cooling efficiency.

According to a sixth aspect of the present invention, the heat pipe is bent at least at one position, and one end thereof is closely attached to the coil end portion via the resin sheet, and the other end is closely adhered to the inner surface of the frame. The motor cooling device according to claim 3, wherein when the motor is installed so that the axis of the motor is in a vertical direction, the main heat generation of the stator is performed by the resin having good conductivity and the heat radiating portion is formed by the heat absorbing portion. The heat pipe having an extremely high thermal conductivity, in which the internal heat transfer material moves well, has an effect that the heat can be efficiently transmitted to the frame as the heat radiating portion, and the cooling efficiency is high.

According to a seventh aspect of the present invention, one end of the heat pipe is brought into close contact with a concave portion formed substantially in the middle of an adjacent coil end portion via a resin sheet, and the other end is brought into close contact with the inner surface of the frame. 7. The cooling device for an electric motor according to claim 3, wherein a contact area between the coil end and the heat pipe via the resin sheet is large and an increase in the coil end height is suppressed. The main heat generated by the heat transfer device can be efficiently transmitted to the frame, which is a heat radiating portion, by a highly conductive resin and a heat pipe having a very high thermal conductivity, and the cooling efficiency is high.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS This embodiment will be described below with reference to FIGS.

(Embodiment 1) FIG. 1 is a side sectional view of a motor cooling device according to a first embodiment of the present invention. In FIG. 1, reference numeral 101 denotes a stator having windings mounted thereon, 102 denotes an end portion (coil end) of the stator windings, and 103 denotes an electric insulator which is a resin sheet having higher heat conductivity than air and having good elasticity and adhesion. , 104 denotes a bracket, 105 denotes a rotor, and 105a denotes a bearing.

The heat generated by the coil end portion 102 of the winding, which is the main heat source of the stator, can be efficiently transmitted to the bracket 104, which is a heat radiating portion, by the highly conductive resin sheet 103, and the cooling efficiency is high. An electric motor cooling device that performs the function can be configured.

(Embodiment 2) FIG. 2A shows a second embodiment of the present invention.
FIG. 4 is a side sectional view of a motor cooling device according to an embodiment of the present invention. FIG. 2B is a partial cross-sectional view of a portion X in FIG. FIG.
, 101 is a stator having a winding attached thereto, 102 is a coil end, 103 is an electrically insulating resin sheet having a higher thermal conductivity than air and having good elasticity and adhesion, 105 is a rotor, and 106 is a cylinder having an inner diameter. Reference numeral 107 denotes a circumferential groove of the frame, and reference numeral 108 denotes a substantially ring-shaped spring slightly larger than the inner diameter of the frame.

A part of the resin sheet 103 having good conductivity is arranged in close contact with the coil end portion 102 and a part thereof is fitted in the groove 107 of the frame by a ring-shaped spring 108, so that it is a main heat source of the stator. The coil end of the winding can be efficiently transmitted to the frame 106, which is a heat radiating portion, by the highly conductive resin sheet 103, so that a cooling device for an electric motor that operates with high cooling efficiency can be configured.

It should be noted that the substantially ring-shaped spring 108 can be expected to have the same effect as a retaining ring for a hole used for fixing a bearing or the like, and can be replaced. Therefore, the shape of the circumferential groove may be circular or rectangular. FIG. 2 shows an example in which one substantially ring-shaped spring is used on one side, but it is also possible to use a plurality of grooves and springs arranged in the grooves to improve adhesion.

(Embodiment 3) FIG. 3 is a side sectional view of a motor cooling device according to a third embodiment of the present invention. In FIG. 3, reference numeral 101 denotes a stator having windings attached thereto, 102 denotes a coil end, 103 denotes an electric insulator, which is a resin sheet having higher thermal conductivity than air and having better elasticity and adhesion, 105 denotes a rotor, 1
Reference numeral 09 denotes a heat pipe in which a refrigerant is sealed in a hollow pipe having a capillary structure on the inner wall.

One end of the heat pipe 109 is brought into close contact with the coil end portion 102 via a resin sheet 103 of good conductivity, and the other end of the heat pipe 109 is connected to the frame 11.
0, the coil ends of the windings, which are the main heat sources of the stator, are connected to the resin 103 having good conductivity and a heat pipe having a very high thermal conductivity. With 109, it is possible to configure a cooling device for an electric motor that can efficiently transmit the heat to the frame 110 as a heat radiating portion and has a function of increasing the cooling efficiency.

(Embodiment 4) FIG. 3 is a side sectional view of a motor cooling device according to a fourth embodiment of the present invention, and FIG. 4 is a partial front view. 3 and 4, reference numeral 101 denotes a stator having windings attached thereto, 102 denotes a coil end, 103 denotes an electrical insulator, a resin sheet having higher heat conductivity than air and having better elasticity and adhesion, 105 denotes a rotor, Reference numeral 109 denotes a heat pipe in which a refrigerant is sealed in a hollow pipe having a capillary structure on an inner wall;
Reference numeral 11 denotes a heat absorbing portion of the heat hype, and 112 denotes a heat radiating portion of the heat pipe.

FIG. 4A shows the left side of FIG. 3 (opposite the output shaft side).
5 is a partial front view of the coil end portion of FIG. 5, in which a heat radiating portion 112 of a heat pipe is curved so as to be in contact with an axial direction of a frame inner diameter. When the motor is installed vertically (the output shaft is directed vertically downward), the heat radiating portion 112 of the heat pipe is always located above the heat absorbing portion 111, so that the heat transfer material inside the heat pipe moves well. Demonstrate excellent cooling efficiency.

FIG. 4B is a partial front view of the coil end portion on the right side (output shaft side) of FIG. 3, and the heat radiating portion 112 of the heat pipe is curved so as to be in contact with the inner diameter of the frame in the circumferential direction. . When the motor is installed horizontally (the output shaft is horizontal), the heat radiating section 112 can be positioned above the heat absorbing section 111 of the heat pipe, and the heat transfer material inside the heat pipe can move well. Yes, with excellent cooling efficiency.

That is, one end of the heat pipe 109 is adhered to the coil end portion 102 via the resin sheet 103, and the other end is located above the end of the coil end portion (the direction opposite to the direction in which gravity acts). Is arranged on the inner surface of the frame 110 outside the stator by the resin sheet 103 so that the coil end of the winding, which is the main heat source of the stator, is formed of a highly conductive resin sheet and a heat radiating portion. The heat pipe is located above the heat absorbing part, so the internal heat transfer material moves well.The heat pipe has a very high thermal conductivity. A cooling device for the electric motor to be performed can be configured.

(Embodiment 5) FIG. 5 is a side sectional view and a partial front view of a motor cooling device according to a fifth embodiment of the present invention. In FIG. 5, 101 is a stator having windings attached thereto, 102 is a coil end, 103 is a resin sheet which is an electrical insulator and has higher heat conductivity than air and has good elasticity and adhesion,
Reference numeral 109 denotes a heat pipe in which a refrigerant is sealed in a hollow pipe having a capillary structure on the inner wall, 111 denotes a heat absorbing portion of a heat hype, and 112 denotes a heat radiating portion of the heat pipe.

FIG. 5A is a side sectional view, and FIG. 5B is a partial front view, in which the heat radiating portion 112 of the heat pipe is curved so as to be inclined and contact with the axial direction of the inner diameter of the frame.
Irrespective of whether the motor is placed vertically or horizontally, the heat radiating portion 112 of the heat pipe can be always arranged above the heat absorbing portion 111, so that the heat transfer material inside the heat pipe moves well and the cooling efficiency is improved. The cooling device of the electric motor having the effect of high power can be configured.

(Embodiment 6) FIGS. 6 (a) and 6 (c) are partial sectional views of a motor cooling device according to a sixth embodiment of the present invention, and FIGS. 6 (b) and 6 (d) are partial front views. It is. In FIG. 6, reference numeral 101 denotes a stator having windings mounted thereon, 102 denotes a coil end, 103 denotes an electric insulator, which is a resin sheet having a higher thermal conductivity than air and having good elasticity and adhesion, and 109 denotes a capillary structure on an inner wall. 3 shows a heat pipe in which a refrigerant is sealed in a hollow pipe.

A heat pipe is arranged in a space within a range of the dimension H in the axial direction of the coil end from the stator end face.
09 is arranged below the coil end height H,
Without increasing the axial length of the motor, the coil end of the winding, which is the main heat source of the stator, can be efficiently radiated by a highly conductive resin sheet and a heat pipe with extremely high thermal conductivity. A cooling device for an electric motor, which can transmit to a frame and has a high cooling efficiency, can be configured.

By arranging one end of the heat pipe 109, which is a heat radiating portion, in a groove or a step of the frame, the heat pipe 109 has an effect of fixing the heat pipe and increasing the adhesion, thereby enabling efficient cooling. .

In particular, the configurations shown in FIGS. 6A and 6B are effective in the case of so-called concentrated winding in which the stator is wound around and mounted on the teeth between the slots. FIG. 6 (c),
The configuration (d) is effective in the case of so-called distributed winding or lap winding in which windings are mounted in slots separated by the stator.

It is needless to say that a suitable cooling device can be obtained by changing the diameter and the number of heat pipes according to the required cooling capacity.

[0038]

As described above, according to the present invention, the heat generated at the coil end, which is the main heat source of the stator, is made of an electrically insulating resin sheet having a higher thermal conductivity than air and a good elasticity and adhesion. Alternatively, the resin sheet and the heat pipe having a very good thermal conductivity can efficiently transmit the heat to the frame or the bracket, which is a heat radiating portion, and the effect of high cooling efficiency can be obtained. Since the resin sheet has high elasticity and adhesion, it does not require jigs or equipment like the resin that needs to be fixed, and can be arranged in the required amount in the required place. By arranging the heat pipe in a space within the range of the axial dimension of the coil end from the stator end face without increasing the weight, the cooling effect can be improved by a simple method without increasing the size of the motor.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a motor cooling device according to an embodiment of the present invention.

FIG. 2A is a side sectional view showing a motor cooling device according to another embodiment of the present invention. FIG. 2B is a partial sectional view showing a motor cooling device according to another embodiment of the present invention.

FIG. 3 is a side sectional view showing a motor cooling device according to another embodiment of the present invention.

FIG. 4A is a partial cross-sectional view illustrating a motor cooling device according to another embodiment of the present invention. FIG. 4B is a front view illustrating a motor cooling device according to another embodiment of the present invention.

FIG. 5 (a) is a partial sectional side view showing a motor cooling device according to another embodiment of the present invention. (B) A front view showing a motor cooling device according to another embodiment of the present invention.

FIG. 6A is a partial sectional side view showing a motor cooling device according to another embodiment of the present invention. FIG. 6B is a partial front view showing a motor cooling device according to another embodiment of the present invention. Partial sectional side view showing a motor cooling device according to another embodiment of the present invention. (D) Partial front view showing a motor cooling device according to another embodiment of the present invention.

FIG. 7 is a side sectional view showing a conventional motor cooling device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 101 Stator 102 Coil end part 103 Resin sheet 104 Bracket 105 Rotor 105a Bearing 106 Frame 107 Circumferential groove 108 Spring 109 Heat pipe 110 Frame 111 Heat absorption part 112 Heat radiation part

Claims (7)

[Claims] A stator having a substantially cylindrical stator having coil ends mounted in a plurality of slots and having ends protruding in an axial direction; a metal bracket for rotatably supporting a rotor; A cooling device for an electric motor, comprising: a resin sheet which is an electrical insulator, has a higher thermal conductivity than air, and has better elasticity and adhesion, and wherein the resin sheet is disposed in close contact between the coil end portion and the bracket. 2. A substantially cylindrical stator having a coil end mounted in a plurality of slots and having axially protruding coil ends, and a metal having a cylindrical inner diameter and a circumferential groove. Frame, a substantially ring-shaped spring slightly larger than the inner diameter of the frame, and a resin sheet having high thermal conductivity and better adhesion than air with an electric insulator, and a part of the resin sheet. A cooling device for an electric motor, wherein a part of the cooling device is disposed in close contact with the coil end portion by the ring-shaped spring. 3. A substantially cylindrical stator having a coil end mounted in a plurality of slots and having ends protruding in an axial direction, a metal frame having a cylindrical inner diameter, A resin sheet having a higher thermal conductivity than air with elasticity and good adhesiveness, and a heat pipe, and a heat pipe. A cooling device for an electric motor, the other end of which is arranged in close contact with the inner surface of the frame. 4. The heat pipe according to claim 3, wherein one end of the heat pipe is brought into close contact with the coil end portion via a resin sheet, and the other end is disposed on the inner surface of the frame located above the end of the coil end portion. Electric motor cooling device. 5. The cooling device for an electric motor according to claim 3, wherein the heat pipe is disposed at a position not protruding in the axial direction from the coil end. 6. The electric motor according to claim 3, wherein the heat pipe is bent at least at one position, one end of the heat pipe is in close contact with the coil end portion via the resin sheet, and the other end is in close contact with the inner surface of the frame. Cooling system. 7. A heat pipe is provided such that one end of the heat pipe is in close contact with a recess formed substantially in the middle of an adjacent coil end portion via a resin sheet, and the other end is in close contact with the inner surface of the frame. A cooling device for an electric motor as described in the above.