CN112994322A - Permanent magnet motor liquid cooling structure and permanent magnet motor - Google Patents
Permanent magnet motor liquid cooling structure and permanent magnet motor Download PDFInfo
- Publication number
- CN112994322A CN112994322A CN201911212804.7A CN201911212804A CN112994322A CN 112994322 A CN112994322 A CN 112994322A CN 201911212804 A CN201911212804 A CN 201911212804A CN 112994322 A CN112994322 A CN 112994322A
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- Prior art keywords
- water channel
- end cover
- housing
- rear end
- hose
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Cooling System (AREA)
Abstract
The invention provides a liquid cooling structure of a permanent magnet motor and the permanent magnet motor adopting the cooling structure. The cooling structure includes: casing water course, front end housing water course and rear end housing water course, the casing water course with the front end housing water course with the rear end housing water course is through many hose connections, many hoses are including being used for connecting the first hose of front end housing coolant liquid import and casing water course front end export, being used for connecting the second hose of front end housing coolant liquid export and casing water course front end import, being used for connecting the third hose of rear end housing coolant liquid export and casing water course rear end import and being used for connecting the fourth hose of rear end housing coolant liquid import and casing water course rear end export.
Description
Technical Field
The invention relates to a liquid cooling structure of a permanent magnet motor, in particular to a liquid cooling structure which is used for a new energy automobile and can effectively cool a stator, a rotor and a bearing of the permanent magnet motor and the permanent magnet motor adopting the cooling structure.
Background
At present, the whole vehicle light weight of a new energy automobile is an important development direction. The new energy permanent magnet motor as a component is imperative to be small and light. With the continuous improvement of the requirements on the new energy permanent magnet motor, the continuous miniaturization, high efficiency and high speed development of the new energy permanent magnet motor is promoted, so that the new energy permanent magnet motor has more severe working conditions, the load capacity born by the unit volume of the motor is increased, and the heat generated by the unit volume is greatly increased to make the cooling condition worse. The heat dissipation effect of the new energy permanent magnet motor directly restricts the improvement of the power density of the motor, the overall performance and the service life. The existing permanent magnet motor generally adopts natural air cooling with a cooling water channel in a shell and a heat dissipation rib outside the shell. The cooling modes can well reduce the temperature of the motor under low load in the motor, but can not fully take away the heat generated by the motor under the working conditions of high load or high rotating speed, thereby influencing the power density, the performance potential and the service life of the permanent magnet motor.
The invention aims to effectively reduce the internal temperature of the motor and control the temperature rise of a motor bearing. By improving the heat dissipation effect, the power density, the overall performance and the service life of the motor can be obviously improved.
At present, the liquid cooling structure is arranged inside the shell of the motor of the new energy permanent magnet motor which adopts liquid cooling, and the structure mainly has two forms, namely a baffling type cooling structure and a spiral type cooling structure. The working principle of the cooling structure is as follows: the cooling liquid flows into the water channel in the machine shell from the water inlet of the machine shell of the motor through the cooling water pipe, and the cooling liquid flowing through the water channel in the machine shell flows out from the water outlet of the machine shell after absorbing the heat transferred to the machine shell from the stator core from the machine shell to take away the heat, so that the motor is cooled circularly. Because of the characteristics of the motor cooling structure, the temperature of the end part of the motor stator winding, the temperature of the rotor and the temperature of the bearing are higher than that of the stator core, and the existing motor cooling structure cannot effectively dissipate heat of the end part of the motor stator winding, the rotor and the bearing, so that the improvement of the power density, the overall performance and the service life of the motor is directly limited.
Disclosure of Invention
This summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.
The invention aims to solve the technical problems of high internal temperature of a motor and high bearing temperature rise of a new energy permanent magnet motor, provides a cooling structure of the new energy permanent magnet motor, particularly relates to a cooling structure capable of effectively cooling a winding and a bearing, and aims to reduce the internal temperature of the motor, control the bearing temperature rise, improve the power density and the overall performance of the motor and prolong the service life of the motor.
According to an aspect of the present invention, there is provided a liquid cooling structure of a permanent magnet motor, wherein the cooling structure includes:
a housing water channel arranged in a housing (6) of the permanent magnet machine, and
either one or both of a front end cover water channel provided in a front end cover (4) of the permanent magnet motor and a rear end cover water channel provided in a rear end cover (10) of the permanent magnet motor.
According to a further embodiment of the invention, the housing water channel is provided with a coolant inlet, a coolant outlet, a housing water channel front end inlet (202), a housing water channel front end outlet (201), a housing water channel rear end inlet (203), and a housing water channel rear end outlet (204);
the front end cover water channel is provided with a front end cover cooling liquid inlet and a front end cover cooling liquid outlet; and is
The rear end cover water channel is provided with a rear end cover cooling liquid inlet and a rear end cover cooling liquid outlet.
According to a further embodiment of the present invention, the housing water channel is connected to the front end cover water channel and the rear end cover water channel by a plurality of hoses.
According to a further embodiment of the invention, the plurality of hoses comprises a first hose (1) for connecting the front end cover coolant inlet with the housing water channel front end outlet (201), a second hose (5) for connecting the front end cover coolant outlet with the housing water channel front end inlet (202), a third hose (9) for connecting the rear end cover coolant outlet with the housing water channel rear end inlet (203), and a fourth hose (12) for connecting the rear end cover coolant inlet with the housing water channel rear end outlet (204).
According to a further embodiment of the invention, at least one of the plurality of hoses is wound around at least one winding head of a stator (7) of the permanent magnet motor for cooling the winding head.
According to a further embodiment of the invention, at least one of the first (1), second (5), third (9) and fourth (12) hoses is evenly banded on the winding heads in the circumferential direction of the winding heads.
According to a further embodiment of the present invention, the housing waterway is of a folded waterway structure.
According to another aspect of the present invention, there is provided a liquid cooling structure for a permanent magnet motor, wherein the cooling structure includes:
the permanent magnet motor comprises a shell water channel arranged in a shell (6) of the permanent magnet motor, wherein a cooling liquid inlet, a cooling liquid outlet, a shell water channel outlet and a shell water channel inlet are formed in the shell water channel; and
a hose connected between the housing water channel outlet and the housing water channel inlet, the hose being wound around at least one winding head of a stator (7) of the permanent magnet motor such that the winding head is cooled when coolant in the housing water channel flows through the hose via the housing water channel outlet and the housing water channel inlet.
According to a further embodiment of the invention, the hose is evenly bound on the winding heads in the circumferential direction of the winding heads.
According to still another aspect of the present invention, there is provided a permanent magnet motor for a new energy automobile, in which the cooling structure as described in the above embodiments is employed.
The above describes the liquid cooling structure of the permanent magnet motor of the present invention, and compared with the prior art, the present invention has at least the following advantages:
(1) the front end cover, the shell and the rear end cover of the motor are all liquid-cooled and are connected into a circulating water channel through the elastic hose, and the elastic hose is tightly attached to the end part of the winding to directly cool the winding, so that the cooling effect in the motor can be improved, the heat generated by the winding at the end part of the motor, the permanent magnet, the rolling bearing, the rotor core and the shaft is effectively reduced, the safety performance of the motor is improved, and the service life of the motor is prolonged.
(2) The invention is provided with the cooling water channel at the rear end cover, and utilizes the cooling liquid to circularly cool the rear bearing, thereby not only controlling the temperature rise of the rear bearing, but also reducing the working temperature of the rotor and effectively preventing the permanent magnet from demagnetizing.
(3) The front end cover is provided with the cooling water channel, and the front bearing is circularly cooled by using the cooling liquid, so that the temperature rise of the front bearing can be controlled, the working temperature of the rotor can be reduced, and the demagnetization of the permanent magnet can be effectively prevented.
(4) The invention can design the motor more compactly and occupy smaller space under the same new energy automobile platform; meanwhile, the material cost of the motor is directly reduced, and the consumption of silicon steel sheets, permanent magnets, coils and the like is reduced.
These and other features and advantages will become apparent upon reading the following detailed description and upon reference to the accompanying drawings. It is to be understood that both the foregoing general description and the following detailed description are explanatory only and are not restrictive of aspects as claimed.
Drawings
So that the manner in which the above recited features of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to embodiments, some of which are illustrated in the appended drawings. It is to be noted, however, that the appended drawings illustrate only some typical aspects of this invention and are therefore not to be considered limiting of its scope, for the description may admit to other equally effective aspects.
Fig. 1 is a schematic diagram of a permanent magnet motor cooling configuration according to an embodiment of the present invention.
Fig. 2 is an expanded view of a cooling water channel in a cooling structure of a permanent magnet motor according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the attached drawings, and the features of the present invention will be further apparent from the following detailed description.
Fig. 1 is a schematic diagram of a cooling structure of a permanent magnet motor according to an embodiment of the present invention. As shown in fig. 1, the permanent magnet motor may include a housing 6, a front end cap 4, a rear end cap 10, a stator 7, a rotor 8, a front bearing 3, a rear bearing 11, a rotating shaft 2, and the like. As an example, the present invention provides cooling channels in each of the front end cover 4, the housing 6, and the rear end cover 10, hereinafter referred to as front end cover channels, housing channels, and rear end cover channels, respectively. The front end cover water channel and the rear end cover water channel are respectively connected with the machine shell water channel through hoses.
In the non-limiting example shown in fig. 1, a coolant inlet and a coolant outlet are provided in the enclosure water channel that communicate with the exterior of the enclosure. In one example, the coolant inlet and the coolant outlet may be disposed on opposite sides of the enclosure 6, such as the top and bottom of the enclosure, respectively. According to an example of the present invention, the housing waterway may be provided with a housing waterway front end outlet 1 and a housing waterway front end inlet 2 near a front end cover side, and may be provided with a housing waterway rear end inlet 3 and a housing waterway rear end outlet 4 near a rear end cover side. The front end cover water channel is provided with a front end cover cooling liquid inlet and a front end cover cooling liquid outlet, wherein the front end cover cooling liquid inlet is connected to the front end outlet 1 of the machine shell water channel through a first hose 1, and the front end cover cooling liquid outlet is connected to the front end inlet 2 of the machine shell water channel through a second hose 5. Similarly, the rear end cover water channel has a rear end cover coolant inlet and a rear end cover coolant outlet, wherein the rear end cover coolant outlet is connected to the housing water channel rear end inlet 3 by a third hose 9, and the rear end cover coolant inlet is connected to the housing water channel rear end outlet 4 by a fourth hose 12. In an alternative embodiment, the first hose 1, the second hose 2, the third hose 9 and the 4 th hose 12 may be wound several times (for example, 3 times) in the circumferential direction of each end of the motor winding, and the cooling hoses are uniformly bound to the ends of the motor winding by using a binding rope in the circumferential direction, and then the housing water channel and the front and rear end covers are connected, so that the winding ends can be effectively cooled. For this purpose, the positions of the water inlet and outlet ports of the front and rear ends of the water passage of the housing and the water inlet and outlet ports of the front and rear end covers may be set near the winding head, respectively. It will also be understood by those skilled in the art that although the present invention has been described in the example of winding each of the winding ends, only a portion of the winding ends may be wound as desired. In other words, it is not limited that each hose must be wound and banded to the winding ends for cooling, nor that each winding end must be cooled (e.g., for practical cooling needs and cost savings).
By the above connection, a complete cooling water channel of the cooling structure of the present invention is formed, and fig. 2 shows an expanded view of the cooling water channel (arrows indicate the flow direction of the cooling liquid). The cooling principle and process of the cooling structure of the present invention will be described below with reference to fig. 1 and 2.
When the motor works, cooling liquid flows in from a cooling liquid inlet on the shell 6. Under pressure, the coolant flows from the rear waterway outlet 204 of the housing 6 into the elastic fourth hose 12. Since the fourth flexible tube 12 is wound and bound on the winding end, the heat of the winding end can be taken away. Subsequently, the coolant flows into the cooling water passage of the rear end cover 10 via the rear end cover coolant inlet, thereby cooling the rear bearing 11.
The cooling liquid flowing out of the cooling liquid outlet of the rear end cover flows through the third hose 9 and takes away the heat of the winding end part, and then returns to the inlet 203 at the rear end of the shell water channel to enter the shell water channel. As shown in fig. 2, the housing waterway of the present invention adopts a folding waterway. Those skilled in the art will appreciate that the hull flume may take other configurations, such as a spiral flume or other suitable flume configuration. Through the machine shell water channel, the cooling liquid takes away the heat generated by the stator iron core.
Then, the cooling liquid flows out from the front end outlet 201 of the housing water channel, takes away the heat of the winding end portion through the first hose 1, and flows into the front end cover water channel through the front end cover cooling liquid inlet, so that the front bearing 3 is cooled, and the heat generated by the front bearing 3 is taken away. The cooling liquid flowing out from the cooling liquid outlet of the front end cover takes away the heat of the winding end part through the second hose 5, returns from the inlet 202 at the front end of the casing water channel to enter the casing water channel, and finally flows out through the cooling liquid outlet of the casing to finish the water channel circulation. It will be appreciated by those skilled in the art that although the water channel circulation is illustrated in fig. 2 as coolant inlet → housing water channel → rear end housing water channel → front end housing water channel → coolant outlet, other suitable water channel circulation designs may be used, such as coolant may flow through the front end housing water channel first and then through the rear end housing water channel, as long as the water channel circulation is capable of flowing through each of the housing water channel, front end housing water channel and rear end housing water channel for cooling the respective portions.
The structure of the cooling water channel of the permanent magnet motor is described above, and different from the existing scheme, the front end cover, the shell and the rear end cover of the permanent magnet motor are all provided with the cooling water channels, the shell water channel can cool the stator core, the front end cover and the rear end cover can directly cool the bearing through liquid cooling, so that the temperature of the rotor is reduced, the hose bound and fixed at the winding end can directly cool the winding end of the stator of the motor, and the working temperature of the rotating shaft, the rotor, the permanent magnet and other parts is jointly reduced through the water channels, so that the demagnetization phenomenon of the permanent magnet can be effectively prevented. The use of the cooling structure can reduce the highest temperature in the motor on one hand, and avoid the motor from reaching the system protection temperature too early due to the stator winding, so that the running time of the motor under the high-power working condition or the high-speed working condition is prolonged, and the potential of the motor can be further explored. On the other hand, the use of the cooling structure can reduce the average working temperature of the motor, control the temperature rise of the bearing, and improve the power density, the overall performance and the service life of the motor.
However, it will be understood by those skilled in the art that although in the above-described examples, the front end cover, the cabinet, and the rear end cover are provided with liquid-cooled cooling water channels, and hoses connected to different water channels are used for cooling the winding ends, the front end cover water channels, the rear end cover water channels, and the hose-wound winding end portions need not be provided at the same time, and one or more of them may be provided according to actual needs, for example, the cooling water channels may only include one of the cabinet water channels and the front end cover water channels or the rear end cover water channels, and the hoses may or may not be wound around the winding end portions. Furthermore, even if the front end cover water channel and the rear end cover water channel are not provided, it is possible to add a hose for cooling the winding head portion only on the basis of the conventional cabinet water channel. For example, a housing water channel outlet and a housing water channel inlet can be provided on the housing water channel for connecting a hose, so that the hose forms part of the cooling water channel, so that the winding head is cooled when the cooling liquid passes through the hose bound to the winding head. The above embodiments and any combination thereof have an additional cooling effect with respect to the conventional case where only the cooling water passage is provided on the cabinet.
Furthermore, it will be understood by those skilled in the art that although the above embodiments assume the permanent magnet motor is used in a new energy automobile, the permanent magnet motor and the cooling structure thereof of the present invention are also applicable to permanent magnet motors used in any other applications.
What has been described above includes examples of aspects of the claimed subject matter. It is, of course, not possible to describe every conceivable combination of components or methodologies for purposes of describing the claimed subject matter, but one of ordinary skill in the art may recognize that many further combinations and permutations of the claimed subject matter are possible. Accordingly, the disclosed subject matter is intended to embrace all such alterations, modifications and variations that fall within the spirit and scope of the appended claims.
Claims (10)
1. The utility model provides a permanent-magnet machine liquid cooling structure which characterized in that, cooling structure includes:
a housing water channel arranged in a housing (6) of the permanent magnet machine, and
either one or both of a front end cover water channel provided in a front end cover (4) of the permanent magnet motor and a rear end cover water channel provided in a rear end cover (10) of the permanent magnet motor.
2. The cooling structure according to claim 1, wherein the housing waterway has a coolant inlet, a coolant outlet, a housing waterway front inlet (202), a housing waterway front end outlet (201), a housing waterway rear end inlet (203), and a housing waterway rear end outlet (204) disposed therein;
the front end cover water channel is provided with a front end cover cooling liquid inlet and a front end cover cooling liquid outlet; and is
The rear end cover water channel is provided with a rear end cover cooling liquid inlet and a rear end cover cooling liquid outlet.
3. The cooling structure of claim 2, wherein the enclosure water channel is connected to the front end cover water channel and the back end cover water channel by a plurality of hoses.
4. The cooling structure according to claim 3, wherein the plurality of hoses includes a first hose (1) for connecting the front end cover coolant inlet and the housing water channel front end outlet (201), a second hose (5) for connecting the front end cover coolant outlet and the housing water channel front end inlet (202), a third hose (9) for connecting the rear end cover coolant outlet and the housing water channel rear end inlet (203), and a fourth hose (12) for connecting the rear end cover coolant inlet and the housing water channel rear end outlet (204).
5. A cooling structure according to claim 3, characterized in that at least one of said plurality of hoses is wound around at least one winding head of a stator (7) of said permanent magnet machine for cooling said winding head.
6. A cooling structure according to claim 5, characterized in that at least one of the first hose (1), the second hose (5), the third hose (9), and the fourth hose (12) is uniformly bound on the winding ends in a circumferential direction of the winding ends.
7. The cooling structure of claim 1, wherein said cabinet waterway is of a folded waterway structure.
8. The utility model provides a permanent-magnet machine liquid cooling structure which characterized in that, cooling structure includes:
the permanent magnet motor comprises a shell water channel arranged in a shell (6) of the permanent magnet motor, wherein a cooling liquid inlet, a cooling liquid outlet, a shell water channel outlet and a shell water channel inlet are formed in the shell water channel; and
a hose connected between the housing water channel outlet and the housing water channel inlet, the hose being wound around at least one winding head of a stator (7) of the permanent magnet motor such that the winding head is cooled when coolant in the housing water channel flows through the hose via the housing water channel outlet and the housing water channel inlet.
9. The cooling structure according to claim 8, wherein the flexible tubes are uniformly bound on the winding overhang in a circumferential direction of the winding overhang.
10. A permanent magnet motor for a new energy automobile, characterized in that the cooling structure of any one of claims 1-9 is adopted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911212804.7A CN112994322A (en) | 2019-12-02 | 2019-12-02 | Permanent magnet motor liquid cooling structure and permanent magnet motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911212804.7A CN112994322A (en) | 2019-12-02 | 2019-12-02 | Permanent magnet motor liquid cooling structure and permanent magnet motor |
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| Publication Number | Publication Date |
|---|---|
| CN112994322A true CN112994322A (en) | 2021-06-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911212804.7A Pending CN112994322A (en) | 2019-12-02 | 2019-12-02 | Permanent magnet motor liquid cooling structure and permanent magnet motor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114567126A (en) * | 2022-03-07 | 2022-05-31 | 杭州桢正玮顿运动控制技术有限公司 | Oil-cooled permanent magnet synchronous motor |
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| US8093770B1 (en) * | 2010-09-15 | 2012-01-10 | Ford Global Technologies, Llc | Electric motor with liquid-cooled end windings |
| CN103545986A (en) * | 2013-10-12 | 2014-01-29 | 中国核动力研究设计院 | Cooling structure of stator bore of shield motor |
| CN106133855A (en) * | 2014-03-28 | 2016-11-16 | 雷米技术有限公司 | Motor with heat transfer reinforcement |
| CN109428422A (en) * | 2017-08-31 | 2019-03-05 | 中车株洲电力机车研究所有限公司 | A kind of electric motor winding end cooling device and cooling system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101043169A (en) * | 2006-03-14 | 2007-09-26 | 通用汽车环球科技运作公司 | Method and apparatus for heat removal from electric motor winding end-turns |
| CN101764454A (en) * | 2008-12-10 | 2010-06-30 | 抚顺煤矿电机制造有限责任公司 | Water cooling structure of motor |
| US8093770B1 (en) * | 2010-09-15 | 2012-01-10 | Ford Global Technologies, Llc | Electric motor with liquid-cooled end windings |
| CN103545986A (en) * | 2013-10-12 | 2014-01-29 | 中国核动力研究设计院 | Cooling structure of stator bore of shield motor |
| CN106133855A (en) * | 2014-03-28 | 2016-11-16 | 雷米技术有限公司 | Motor with heat transfer reinforcement |
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Application publication date: 20210618 |