WO2017145313A1

WO2017145313A1 - Dynamo-electric machine

Info

Publication number: WO2017145313A1
Application number: PCT/JP2016/055566
Authority: WO
Inventors: 康太郎塩田; 丈典馬場
Original assignee: 三菱電機株式会社
Priority date: 2016-02-25
Filing date: 2016-02-25
Publication date: 2017-08-31

Abstract

This dynamo-electric machine 10 solves the conventional problems of deterioration of radiation performance and reduction in insulation performance due to an increase in the weight of the dynamo-electric machine itself and the structure thereof, and comprises: a stator 53 having a core back portion 25 provided with a plurality of holes 21; and a fan 13. The dynamo-electric machine 10 is configured by comprising: a plurality of electrically and heat conductive solid or hollow heat lanes 2 each having a rod-like, elongated shape which are inserted into the holes 21; and a thermal diffusion unit 3 which is joined to the heat lanes 2 and arranged to face the fan 13.

Description

Rotating electric machine

The present invention relates to a rotating electrical machine including a heat dissipation component.

In recent years, miniaturization and high output of rotating electrical machines have progressed, and accordingly, improvement of heat dissipation of the rotating electrical machines has become important. Conventional rotating electrical machines are cooled by installing a cooling fan near the rotating shaft on the anti-load side, but in the case of variable-speed rotating electric rotating machines such as servo motors, In many cases, sufficient cooling performance cannot be obtained, and a cooling fan having an independent electric motor is provided (for example, see Patent Document 1).

Further, as another method for cooling the rotating electrical machine, a method has been proposed in which a cooling pipe as a cooling tube is disposed in a space on the slot center side inside the rotating electrical machine (see, for example, Patent Document 2).

On the other hand, high-frequency sensors such as encoders for detecting the rotational position, such as servo motors, have recently increased with the cooling of rotating electrical machines, and high frequency noise has been applied from the outside like rotating electrical machines driven by inverters. The importance of noise countermeasures for rotating electrical machines is increasing as the number of rotating electrical machines equipped with CPUs and ASICs for signal processing increases.

Japanese Patent Application Laid-Open No. 08-289505 (page 7, FIG. 1) Japanese Patent Laid-Open No. 2003-230253 (page 7, FIG. 2)

The conventional rotating electric machine is configured as described above, and when the cooling fan having the electric motor is separated by a partition in the metal container in which the rotating electric machine is stored, the weight of the rotating electric machine itself is increased and the heat dissipation performance is increased. There is a problem of incurring deterioration. On the contrary, when the separation is not performed by the partition walls, noise is emitted through the power source of the fan or the input / output port of the electronic device, which has a problem in that it adversely affects the rotating electrical machine control.

Furthermore, there is a problem that the cooling pipe itself deteriorates the insulation performance of the rotating electrical machine due to the influence of the surge voltage generated by increasing the operating voltage of the rotating electrical machine and combining the rotating electrical machine and the drive driver.

The present invention has been made to solve the above-described problems, and without damaging the insulation performance, by simply installing a heat lane as a heat transfer section, it is possible to exhibit high heat dissipation performance. The purpose is to shield noise from an electromagnetic noise source without installing a shielding partition wall that leads to a significant increase in the weight of the rotating electrical machine itself.

In the rotating electrical machine according to the present invention, a plurality of heat transfer portions that are in contact with the core back portion that constitutes the stator and that have heat conductivity and are solid or hollow inside, and heat transfer that has heat conductivity A thermal diffusion part joined to the part.

According to the present invention, a heat transfer portion is inserted or brought into contact with the core back portion, and cooling by heat radiation from the outer frame of the rotating electrical machine or forced air cooling by a fan is performed on the heat diffusion portion joined to the heat transfer portion. Furthermore, the heat diffusing unit is installed so as to face the noise source and the fan or position detecting unit that becomes the noise propagation path, and at least the heat transfer unit or the heat diffusing unit is grounded. While improving, the tolerance with respect to electromagnetic noise can be strengthened, As a result, it becomes possible to provide a rotary electric machine with a small size and high output.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a structural diagram of a heat dissipation component showing Example 1 of the present invention. It is sectional drawing of the rotary electric machine which attached the thermal radiation component which shows Example 1 of this invention. It is a shape schematic diagram of the stator core which shows Example 1 of this invention. It is sectional drawing of the rotary electric machine which attached the thermal radiation component which shows Example 1 of this invention. It is a shape schematic diagram of the stator core which shows Example 1 of this invention. It is a structural diagram of the heat dissipation component showing Example 2 of the present invention. It is sectional drawing of the rotary electric machine which attached the heat radiating component which shows Example 2 of this invention. It is a structural diagram of the heat dissipation component showing Example 3 of the present invention. It is a structural diagram of the heat dissipation component showing Example 3 of the present invention. FIG. 6 is a structural diagram of a heat dissipation component showing Embodiment 4 of the present invention. FIG. 6 is a structural diagram of a heat dissipation component showing Embodiment 4 of the present invention.

Example 1.
FIG. 1 is a structural diagram of a heat dissipation component showing Embodiment 1 of the present invention. The heat dissipating component 1 is composed of a heat lane 2 which is a rod-like and elongated inside and a plurality of solid heat transfer parts and a disk-like heat diffusion part 3, and on one side of the heat diffusion part 3, along the outer periphery One end of the heat lane 2 is joined at equal intervals. Both the heat lane 2 and the thermal diffusion unit 3 have good thermal conductivity, and are made of, for example, a material that shields radio waves such as copper, or a metal material that can be magnetically shielded such as an iron-based material. The heat diffusion part 3 shown in FIG. 1 has a disk shape, but may have a structure in which a metal net is stretched in a cup-like or annular hollow part.

FIG. 2 is a cross-sectional view of a rotating electrical machine to which a heat dissipating component showing Embodiment 1 of the present invention is attached. As shown in FIG. 2, the rotating electrical machine 10 includes a stator 53 that is wound, a rotor 51 that rotates inside the stator 53, and a rotating shaft 52 that is attached to the rotor 51.

Reference numerals

56 a and 56 b denote bearings for holding the rotating shaft 52. The stator 53 is energized and controlled by the drive driver 54. As a result, the rotor 51 rotates and the rotating shaft 52 rotates.

Most of the heat generated in the rotating electrical machine 10 is due to Joule heat of the windings applied to the stator 53 and eddy currents and hysteresis loss generated in the plurality of stator cores 11 constituting the stator 53. The child core 11 corresponds to a main heat dissipation path for the generated heat. The plurality of rod-shaped heat lanes 2 are attached to the inside of the stator core 11 and serve to guide the generated heat to the outside of the rotating electrical machine 10.

The heat guided to the outside of the rotating electrical machine 10 is transmitted to the heat diffusing unit 3 joined to the heat lane 2, and the heat diffusing unit 3 serves as a heat radiating plate. The heat diffusing unit 3 is installed at a position facing the fan 13 driven by the fan power supply 55 and is forcibly cooled by the fan 13.

The heat diffusing unit 3 is installed at a position facing the encoder 12 that is a position detecting unit that functions as a sensor of the rotating electrical machine 10, and the stator core 11 and the heat lane 2 are grounded. In addition, an electromagnetic shield is formed around the encoder 12 by the heat diffusion unit 3. By forming this electromagnetic shielding, electromagnetic radiation noise caused by the clock of the encoder 12 is prevented from propagating to the fan power supply 55 and released to the outside of the rotating electrical machine 10, or conversely, noise propagated from the fan power supply 55 is Can be prevented.

Further, in order to enhance the electromagnetic shielding effect, a ground terminal is provided in the heat diffusing section 3, and this ground terminal is connected to the ground of the rotating electrical machine 10, the ground of the heat lane 2, the ground of the encoder 12, and the ground of the fan 13, respectively. Also good.

In FIG. 2, the heat lane 2 is attached so as to penetrate the end cover 14 provided at the opposite end of the rotating electrical machine 10, but in order to prevent water and dust from entering the rotating electrical machine 10, By sealing the penetration portion where the heat lane 2 penetrates the end cover 14 with a rubber bush or resin, it is possible to configure the fully-closed rotating electrical machine 10.

FIG. 3 is a schematic diagram of the shape of the stator core showing the first embodiment of the present invention. The stator 53 is configured by connecting a plurality of stator cores 11 in an annular shape. The stator core 11 includes a core back portion 25 corresponding to the outer peripheral portion of the stator 53 and a teeth portion 26 to which a winding is applied. In the first embodiment of the present invention, the magnetic path of the core back portion 25 is blocked. A hole 21 for inserting the heat lane 2 is provided in a portion that is not present. Since a gap generated when the heat lane 2 is inserted into the hole 21 becomes a thermal resistance, the thermal resistance value can be reduced by sealing the gap with a resin or grease having a good thermal conductivity. When the heat lane 2 is a hollow conduit and is made of a soft material, one end of the heat lane 2 is closed, the inside of the pipe line is pressurized from the other end, and the heat lane 2 itself is expanded and deformed. By doing so, the gap generated when the heat lane 2 is inserted into the hole 21 can be sealed, and the heat lane 2 can be fixed to the stator core 11.

FIG. 4 is a cross-sectional view of a rotating electrical machine to which a heat dissipating component showing Embodiment 1 of the present invention is attached. In FIG. 4, the fan 13 is installed on the side surface of the rotating electrical machine 10 along the direction of the rotating shaft 52 in order to shorten the overall length of the rotating electrical machine 10. When the fan 13 is installed on the side surface along the direction of the rotating shaft 52 of the rotating electrical machine 10, since the heat lane 2 is a rod-shaped metal material, the heat diffusing unit 3 is placed on the front surface of the fan 13 by bending the heat lane 2. Can be installed. Also in this case, similarly to the configuration shown in FIG. 2, it is possible to prevent the high-frequency noise mainly transmitted from the drive driver 54 from the rotating electrical machine 10 from propagating to the fan power supply 55.

In this way, the heat lane 2 is inserted into the hole 21 provided in the core back portion 25, the air diffusion portion 3 connected to the heat lane 2 is subjected to forced air cooling by the fan 13, and the heat diffusion portion 3 is further connected to the noise source and Since it is installed so as to face the fan 13 and the encoder 12 serving as a noise propagation path, and at least the heat lane 2 or the heat diffusion unit 3 is grounded, the heat radiation is improved and the resistance to electromagnetic noise is enhanced. As a result, it is possible to provide a rotating electric machine that is small and has high output.

In the first embodiment of the present invention, the case where the heat lane 2 is inserted into the hole 21 provided in the core back portion 25 as shown in FIG. 3 has been described. However, as shown in FIG. A similar effect can be obtained by providing a notch 61 in the part and inserting the heat lane 21 so as to contact the notch 61. Furthermore, the same effect can be obtained even if the heat lane 21 is brought into direct contact with the outer peripheral surface of the core back portion 25.

Example 2
FIG. 6 is a structural diagram of a heat dissipating component showing Embodiment 2 of the present invention. The heat dissipating component 100 is composed of a plurality of rod-like and elongate heat lanes 21 and a disk-shaped heat diffusing portion 31, and one end of the heat lane 21 is joined to one side of the heat diffusing portion 31 along the outer periphery at equal intervals. Is done. Each of the heat lanes 21 has a hollow cylindrical shape having a through hole inside, and the through hole of the hollow portion penetrates through the heat diffusing portion 31.

FIG. 7 is a sectional view of a rotating electrical machine to which a heat dissipating component showing Embodiment 2 of the present invention is attached. As shown in FIG. 7, an opening 15 exists in a part of the load side opposite to the mounting side of the heat dissipating component 100 that is the anti-load side of the rotating electrical machine 10. By moving the air inside, the plurality of stator cores 11 constituting the stator 53 can be cooled more efficiently, and the same effect as in the first embodiment of the present invention can be obtained.

Example 3 FIG.
FIG. 8 is a cross-sectional view of a rotating electrical machine to which a heat dissipation component showing Embodiment 3 of the present invention is attached. In the first embodiment of the present invention, the heat diffusing unit 3 is installed at a position facing the fan 13 driven by the fan power supply 55 and is forcibly cooled by the fan 13, but in the third embodiment of the present invention, As shown in FIG. 8, the heat diffusion part 32 is directly joined to the outer frame 71 of the rotating electrical machine 10. By adopting such a configuration, the heat of the heat diffusing unit 32 can be transmitted to the outer frame 71, the stator 53 can be cooled, and the fan 13 can be made unnecessary. Furthermore, since the heat diffusion unit 32 is grounded, an electromagnetic shield is formed around the encoder 12, and the same effect as in the first embodiment of the present invention can be obtained.

In FIG. 8, the heat lane 2 is attached so as to penetrate the inside of the stator core 11, but as shown in FIG. 9, the heat lane 22 is attached so as to be in contact with the end face on the counterload side of the stator 53. The same effects as those of the first embodiment of the present invention can be obtained.

Example 4
10 and 11 are structural diagrams of heat dissipating parts showing Embodiment 4 of the present invention. The heat dissipating component 101 is composed of a plurality of rod-shaped and elongated heat lanes 23 and a disk-shaped heat diffusing portion 33, and one end of the heat lane 23 is joined at equal intervals along the outer periphery on one surface of the heat diffusing portion 33. Is done. Each of the heat lanes 23 has a hollow cylindrical shape having a through hole inside, and the through hole of the hollow portion penetrates to the heat diffusion portion 33. As shown in FIGS. 9 and 10, a hollow heat lane 23 is attached in advance to the inside of the plurality of stator cores 11 constituting the stator 53, and the adjacent heat lanes 23 are alternately connected to the pipe connection member 41 and the heat diffusion. The pipes are formed by connecting the adjacent heat lanes 23 provided in the inside of the section 33 with a cavity 42 that connects the adjacent heat lanes 23. The joining is performed by welding or pipe screws, and by flowing cooling water, a refrigerant, or the like in the formed pipe line, the plurality of stator cores 11 constituting the stator 53 can be cooled. The same effect as in the first embodiment can be obtained.

In Embodiment 4 of the present invention, adjacent heat lanes 23 are connected to form a pipe line, but the connection order is not limited to this method.

In the present invention, the servo motor having the encoder 12 is taken as an example, but electronic devices such as a tension control motor having a torque sensor and a so-called intelligent motor having a switching element and a drive driver are mounted. The present invention can also be applied to a rotating electric machine having a noise source such as a rotating electric machine or a brush of a DC motor.

1, 100, 101

Heat dissipation component

2, 21, 22, 23

Heat lane

3, 31, 32, 33 Heat diffusion part 10, Rotary electric machine, 11 Stator core, 12 Encoder, 13 Fan, 14 End cover, 15 Opening , 21 hole, 25 core back part, 26 tooth part, 41 pipe connection member, 42 hollow part, 51 rotor, 52 rotating shaft, 53 stator, 54 drive driver, 55 fan power supply, 56a, 56b bearing, 61 cut Missing, 71 outer frame.

Claims

A plurality of heat transfer parts which are in contact with the core back part constituting the stator and have a thermal conductivity and are solid or hollow inside;
A thermal diffusion part having thermal conductivity and joined to the heat transfer part;
A rotating electrical machine comprising:
2. The rotating electrical machine according to claim 1, wherein the heat transfer unit is brought into contact with the heat transfer unit by being inserted into a hole provided in the core back unit.
The rotating electrical machine according to claim 1, wherein the heat transfer unit and the heat diffusion unit have conductivity, and at least the heat transfer unit or the heat diffusion unit is grounded.
The rotating electrical machine according to any one of claims 1 to 3, wherein the heat diffusion portion is joined to an outer frame of the rotating electrical machine.
The rotating electrical machine according to claim 4, wherein the outer frame is grounded.
4. The rotating electrical machine according to claim 1, wherein the rotating electrical machine includes a fan, and the heat diffusion unit is disposed to face the fan.
The rotating electrical machine according to any one of claims 1 to 6, wherein the rotating electrical machine includes a position detection unit, and the heat diffusion unit is disposed to face the position detection unit.
The rotating electrical machine according to claim 7, wherein the position detection unit is grounded.
The rotating electrical machine according to any one of claims 1 to 8, wherein the heat diffusion portion has a pipe line inside.