CN110912299A - Air gap heat radiation structure of high-speed motor - Google Patents
Air gap heat radiation structure of high-speed motor Download PDFInfo
- Publication number
- CN110912299A CN110912299A CN201911341846.0A CN201911341846A CN110912299A CN 110912299 A CN110912299 A CN 110912299A CN 201911341846 A CN201911341846 A CN 201911341846A CN 110912299 A CN110912299 A CN 110912299A
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- China
- Prior art keywords
- rotor
- air gap
- speed
- stator
- heat dissipation
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/20—Stationary parts of the magnetic circuit with channels or ducts for flow of cooling medium
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/24—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors with channels or ducts for cooling medium between the conductors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/08—Arrangements for cooling or ventilating by gaseous cooling medium circulating wholly within the machine casing
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
- H02K2201/03—Machines characterised by aspects of the air-gap between rotor and stator
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Cooling System (AREA)
Abstract
The invention discloses a structure for dissipating heat by utilizing an air gap of a high-speed motor, which utilizes the energy of a rotor driving air in the air gap to rotate around, so that the air obtains the speed of moving along the axial direction of the rotor, and the exchange of the air and heat in the air gap with the outside is completed. The invention has the advantages that the heat dissipation structure is fixed on the stator and does not rotate along with the rotor, and the requirement on material strength is low. As long as the rotor rotates to drive airflow, the structure can have a guiding effect to generate circulation between the inside and the outside of the air gap and generate a heat dissipation effect, and the process is physical and very reliable. In addition, along with the increase of the rotating speed, the heat generation of the motor is increased, the circulating speed of the airflow is also increased, and the heat dissipation effect is also improved, so that the heat dissipation structure is very reliable. Finally, the structure utilizes the large air gap of the motor, and has small volume and low cost.
Description
Technical Field
The application relates to the field of high-speed motors and provides a high-speed motor air gap heat dissipation structure.
Background
The high-speed motor has high power density and small volume, and heat generated in the rotor, heat generated by gas friction in the air gap and parts generated on the stator must be timely discharged during operation so as to prevent the motor from being burnt due to overhigh temperature rise. This is usually achieved by blowing air into the air gap using an external blower. However, if the external blower fails, the high speed motor burns out in a short period of time. There is also a solution in which an impeller for blowing air is added to the rotor, but the presence of this impeller increases the length of the rotor, so that the critical speed of the rotor is reduced, limiting the maximum speed of the high-speed motor. Meanwhile, the requirement on the strength of the material of the impeller rotating at high speed is high, the cost of the high-speed motor is increased, and the reliability is reduced.
Disclosure of Invention
In order to reduce gas friction loss heating in an air gap and eddy current loss heating caused by space harmonics of a stator magnetic pole in a rotor of a high-speed motor, the air gap between the rotor and the stator is large.
Based on the large air gap characteristic of the high-speed motor, the invention discloses a structure for dissipating heat by utilizing the air gap of the high-speed motor. A flow guide structure is disposed in the air gap and is fixed to the stator without mechanical connection to the rotor. When the rotor rotates at a high speed, the gas in the air gap is driven by the rotor to rotate around the rotor in the flow guide structure. Because of the guiding function of the flow guide structure, the gas rotating in the flow guide structure moves along the direction of the rotating shaft of the rotor, and is discharged from the end part of the rotor after moving to the end part of the rotor. At the same time, the other end of the rotor will continuously suck in new gas. The gas is driven by the continuous rotor and guided by the guide structure to circulate with the outside through the air gap between the rotor and the stator, so that the heat generated by the motor is taken away.
The invention has the advantages that the flow guide structure is fixed on the stator and does not rotate along with the rotor, so that no special requirement is imposed on the strength of materials. Secondly, as long as the rotor rotates and drives the airflow, the guide structure can have a guide effect to generate a heat dissipation effect, and the process is physical and has a very reliable heat dissipation function. In addition, along with the increase of the rotating speed, the heat production of the motor is increased, the air flow speed in the flow guide structure is also increased, and the heat dissipation performance is also improved, so that the heat dissipation performance of the flow guide structure is very reliable. Finally, the flow guide structure utilizes the self large air gap of the motor, and has small volume and low cost.
Drawings
Fig. 1 shows a cross section of a motor including a heat dissipation structure of a flow guide structure.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Fig. 1 shows the structure of a high-speed motor, which is composed of a rotor 1 and a stator 2. The rotating magnetic field generated by the current in the stator 2 exerts a torque on the rotor 1 through the air gap between the rotor 1 and the stator 2. Eddy current hysteresis loss heat generation of the high-speed motor rotor 1 and air flow friction loss in the air gap are considerable, and the heat generation is difficult to be dissipated to the outside through the stator 2 and generally needs to be dissipated to the outside through the air gap.
The invention discloses a heat dissipation structure, which is composed of a flow guide structure 3 arranged in an air gap. The flow guiding structure 3 is mounted on the stator 2 in good thermal contact with the stator 2. The flow guiding structure 3 is not in direct mechanical contact with the rotor 1. The flow guiding structure 3 is provided with a structure with flow guiding function at the side of the rotor 1. When the motor rotor 1 rotates at a high speed, the gas in the air gap is driven by the rotor 1 to rotate along with the rotor. During the rotation of the gas around the rotor 1, the gas will obtain a velocity along the rotation axis of the rotor 1 while rotating around the rotor 1 due to the flow guiding effect of the flow guiding structure 3, move towards one end of the rotor and finally be discharged from the end 5 of the rotor 1. At the same time, gas will be sucked into the air gap from the other end 4 of the rotor. Thus, as gas continues to enter the air gap from one end 4 of the rotor and exits the air gap from the other end 5, a circular flow of gas and ambient gas within the air gap is established, taking heat away from the air gap. This process occurs as the rotor 1 rotates, and the faster the rotor 1 rotates, the faster the gas circulation rate will be.
In order to increase the heat dissipation effect of the gas circulation, the flow guiding structure 3 may also be placed in the gap between the winding 6 and the rotor 1. The gap is provided with a flow guiding structure, so that the gap also has a circulating heat dissipation effect, and is considered as a component of an air gap between the rotor and the stator in the invention.
The advantage of the invention is that the flow guiding structure is fixed to the stator 2 and does not rotate with the rotor 1, so that no special requirements are imposed on the strength of the material of the flow guiding structure.
The invention has the advantages that as long as the rotor 1 rotates to drive airflow, the flow guide structure 3 can generate gas circulation action to generate a heat dissipation function, and the process is physical and very reliable. Along with the increase of the rotating speed, the heat production of the motor is increased, the circulating speed of the air flow in the flow guide structure 3 is correspondingly increased, and the heat dissipation effect is improved along with the increase of the circulating speed, so that the heat dissipation effect of the flow guide structure is very guaranteed.
The invention has the advantages that the flow guide structure utilizes the large air gap of the high-speed motor, and has small volume and low cost.
The invention discloses a high-speed motor air gap heat dissipation structure, and discloses a flow guide structure 3 arranged in an air gap. The basic principle of the invention is that the rotor 1 rotates to drive the airflow to rotate around the rotor 1, the airflow in the air gap obtains the speed along the axial direction of the rotor by utilizing the energy of the airflow rotating around the rotor 1 and the mechanical structure arranged in the air gap, the circulation of the air in the air gap and the outside air is established, and the heat dissipation function is realized. Therefore, designs based on this working principle are all within the protection scope of the present invention.
The flow guiding structure 3 may be implemented by a cylinder with a spiral groove on the inner wall. This embodiment has been shown more visually in figure 1.
A plurality of separate guide vanes may be provided in the air gap, which vanes have a non-zero pitch angle to the plane of rotation, which pitch angle causes the gas rotating around the rotor to obtain a velocity of movement in the axial direction, thereby establishing a circulation of the gas in the air gap with the environment. This is another embodiment of the invention.
The shape of the magnetic pole of the stator 2 can also be directly modified, so that the magnetic pole directly acts on the gas rotating around the rotor, and the gas obtains the speed of moving along the axial direction, thereby establishing the circulation of the gas in the air gap and the outside. This is yet another embodiment of the present invention.
It is also possible to provide a jacket over the windings 6, so that the gas between the windings 6 and the rotor 1 obtains a speed of movement in the axial direction when rotating around the rotor, etc.
It can be understood by those skilled in the art that the patent is not limited to this embodiment, and the gas in the air gap can be moved around the rotor by the energy of the gas in the air gap and the axial movement speed of the gas can be obtained by a mechanical structure.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (6)
1. A heat radiation structure of a high-speed motor comprises a rotor 1, a stator 2 and a flow guide structure 3.
2. Flow guiding structure 3 according to claim 1, placed in the air gap between the rotor 1 and the stator 2, and further placed in the gap between the winding 6 and the rotor 1.
3. Flow directing structure 3 according to claim 1, characterised in that it is mechanically connected to the stator 2 in good thermal contact.
4. Flow directing structure 3 according to claim 1, characterised in that there is no mechanical connection to the rotor 1.
5. Flow directing structure 3 according to claim 1, characterized in that the energy of the rotation of the rotor 1 is used to rotate the gas around the rotor, so that the gas obtains a velocity in the direction of the rotor axis.
6. Flow-guiding structure 3 as claimed in claim 1, which can be formed by individual spiral grooves, by a plurality of separate guide vanes, or directly by the poles of stator 2, or by being arranged on winding 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911341846.0A CN110912299A (en) | 2019-12-24 | 2019-12-24 | Air gap heat radiation structure of high-speed motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911341846.0A CN110912299A (en) | 2019-12-24 | 2019-12-24 | Air gap heat radiation structure of high-speed motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110912299A true CN110912299A (en) | 2020-03-24 |
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ID=69827254
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911341846.0A Pending CN110912299A (en) | 2019-12-24 | 2019-12-24 | Air gap heat radiation structure of high-speed motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110912299A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102025222A (en) * | 2010-11-08 | 2011-04-20 | 肖富凯 | Motor air cooling structure and horizontal motor |
| CN103026597A (en) * | 2010-07-28 | 2013-04-03 | 西门子公司 | Fluid-cooled electric machine |
| CN205429914U (en) * | 2015-10-30 | 2016-08-03 | 天津中德职业技术学院 | Spiral self cooling rotor structure of high speed permanent magnet motors |
| CN110311511A (en) * | 2019-07-16 | 2019-10-08 | 珠海格力电器股份有限公司 | Water conservancy diversion end ring, motor stator, motor and the household electrical appliance of motor |
-
2019
- 2019-12-24 CN CN201911341846.0A patent/CN110912299A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103026597A (en) * | 2010-07-28 | 2013-04-03 | 西门子公司 | Fluid-cooled electric machine |
| CN102025222A (en) * | 2010-11-08 | 2011-04-20 | 肖富凯 | Motor air cooling structure and horizontal motor |
| CN205429914U (en) * | 2015-10-30 | 2016-08-03 | 天津中德职业技术学院 | Spiral self cooling rotor structure of high speed permanent magnet motors |
| CN110311511A (en) * | 2019-07-16 | 2019-10-08 | 珠海格力电器股份有限公司 | Water conservancy diversion end ring, motor stator, motor and the household electrical appliance of motor |
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| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200324 |