CN113644784B - Oil cooling driving motor and automobile - Google Patents
Oil cooling driving motor and automobile Download PDFInfo
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- CN113644784B CN113644784B CN202010393781.0A CN202010393781A CN113644784B CN 113644784 B CN113644784 B CN 113644784B CN 202010393781 A CN202010393781 A CN 202010393781A CN 113644784 B CN113644784 B CN 113644784B
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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
- H02K9/19—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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- 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
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/32—Rotating 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
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
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- Motor Or Generator Cooling System (AREA)
Abstract
The invention provides an oil-cooled driving motor and an automobile, wherein the oil-cooled driving motor comprises a shell, a stator core, a stator winding coil and a rotor core which are sequentially arranged from outside to inside, and further comprises an oil cooling system, at least one stator partition plate and at least one rotor partition plate; the stator partition plate divides the stator iron core into at least two sections along the axial direction and forms a stator cooling gap; the rotor clapboard divides the rotor iron core into at least two sections along the axial direction, and the rotor clapboard and the stator clapboard are arranged in one-to-one correspondence; the oil cooling system comprises an oil inlet, a cooling oil cavity, a cooling loop, a motor cavity and an oil outlet; the cooling circuit comprises an end portion cooling circuit and a middle portion cooling circuit, and is used for cooling two ends of the stator winding coil, two ends of the stator iron core and two ends of the rotor iron core respectively, and cooling the middle portion of the stator winding coil and the middle portion of the stator iron core respectively. The motor provided by the invention improves the temperature field distribution of the driving motor, thereby improving the output capability of the motor.
Description
Technical Field
The invention relates to the field of motor manufacturing, in particular to an oil-cooled driving motor and an automobile comprising the same.
Background
The driving motor used on the new energy automobile has the performance requirements of high power density and high torque density, and how to enhance the cooling and heat dissipation of the motor so as to improve the output capacity of the motor is an important research field. At present, the cooling of the driving motor for the vehicle is developing from water cooling of a motor shell to oil spraying cooling inside the motor, and particularly, the driving motor with high power and high rotating speed generally adopts an oil cooling mode.
The prior oil-spray cooling motor generally only carries out oil-spray cooling on the end part of the stator winding coil and the outer surface of the stator core (or an equivalent fixed shell). The end winding of the motor is directly contacted with the cooling medium in the cooling mode, and the temperature is relatively low; the heat dissipation path of a winding coil in a stator slot is long, the highest winding temperature usually occurs in an approximate axial center position in the stator slot, and the insulation material around the winding coil becomes the weakest heat-resistant link. The winding temperature shows a serious axial phenomenon of low two ends and high middle, and the uniformity of axial heat dissipation is poor. In order to facilitate manufacturing, a temperature sensor for monitoring the operating temperature of the motor needs to be arranged at the end part of the winding, the temperature difference between the highest temperature point in the slot and the temperature measuring point at the end part of the winding is very large, and the motor is difficult to be accurately monitored and controlled to work, so that the operating capacity of the motor is generally required to be reduced in order to protect the motor from thermal failure of the weakest insulating material in the slot, and the temperature resistance of an insulating system cannot be fully utilized.
The prior art also has a motor with the bottom immersed in oil, because the rotor core and the stator winding coil directly contact with cooling oil, the temperature is relatively low during operation, but the winding temperature in the stator core slot positioned above is relatively high, which is not uniform in axial heat dissipation in the stator core slot, but also has the problem of non-uniform heat dissipation in the circumferential direction, and is not beneficial to balance the temperature resistance of the insulating material.
Disclosure of Invention
The invention aims to solve the problem of unbalanced heat dissipation of the motor in the prior art. The utility model provides a cold driving motor of sectional type oil, the axial different positions set up cooling circuit, have improved driving motor's temperature field distribution for the temperature field distribution of motor is according to more even, thereby promotes the output capability of motor.
In order to solve the technical problem, the invention provides an oil-cooled driving motor which comprises a shell, a stator core, a stator winding coil and a rotor core, wherein the shell, the stator core, the stator winding coil and the rotor core are sequentially arranged from outside to inside, a gap is formed between the inner wall surface of the stator winding coil and the outer wall surface of the rotor core, two ends of the stator core are respectively close to two ends of the stator winding coil, two ends of the rotor core are respectively close to two ends of the stator winding coil, and the oil-cooled driving motor further comprises an oil cooling system.
The oil-cooled driving motor also comprises at least one stator partition plate and at least one rotor partition plate; the stator core is divided into at least two sections of stator cores by at least one stator partition plate along the axial direction of the stator core, and the stator partition plate in the at least one stator partition plate is fixed between any two adjacent sections of stator cores to form a stator cooling gap; and the rotor core is divided into at least two sections of rotor cores by at least one rotor partition plate along the axial direction of the rotor core, the rotor partition plate in the at least one rotor partition plate is fixed between any two adjacent sections of rotor cores, the at least one rotor partition plate and the at least one stator partition plate are arranged in a one-to-one correspondence manner, and the rotor partition plate of the at least one rotor partition plate and the corresponding stator partition plate are aligned in the axial direction of the rotor partition plate.
The oil cooling system comprises an oil inlet, a cooling oil cavity, a cooling loop, a motor cavity and an oil outlet; the shell comprises an outer shell and an inner shell which are sleeved from outside to inside, and the inner shell surrounds the peripheries of the stator iron core, the stator winding coil and the rotor iron core; the cooling oil cavity is arranged between the outer shell and the inner shell and surrounds the periphery of the inner shell along the circumferential direction of the inner shell, the cooling oil cavity extends along the axial direction of the inner shell, and two ends of the cooling oil cavity are close to two ends of the inner shell respectively; the oil inlet and the oil outlet are arranged on the outer shell, the oil inlet is communicated with the cooling oil cavity, the oil outlet is arranged at the position, which is not connected with the inner shell, of the outer shell and is communicated with the motor cavity, so that cooling oil entering the cooling oil cavity from the oil inlet flows to the motor cavity after cooling each section of stator core, each section of stator winding coil and each section of rotor core through the cooling circuit, and finally flows out through the oil outlet.
The cooling loop comprises end cooling loops and a middle cooling loop, the end cooling loops are respectively arranged corresponding to the two ends of the stator winding coil, the middle cooling loop corresponds to the position of the stator winding coil, which is adjacent to the at least one stator partition plate, and the end cooling loops are used for respectively spraying cooling oil in the cooling oil cavity to the two ends of the stator winding coil from the positions, close to the two ends of the stator winding coil, of the cooling oil cavity so as to cool the two ends of the stator winding coil, the two ends of the stator core and the two ends of the rotor core; the middle cooling loop is used for spraying cooling oil in the cooling oil cavity to the middle of the stator winding coil from the position, adjacent to the at least one stator partition plate, of the cooling oil cavity through the corresponding stator cooling gaps respectively so as to cool the middle of the stator winding coil and the middle of the stator iron core.
By adopting the scheme, the cooling loops are arranged at different axial positions by arranging the axial sections, and the cooling loops comprise the end cooling loop and the middle cooling loop, so that the uniformity of the motor oil cooling axis direction can be obviously improved, the temperature field distribution of the driving motor is improved, the temperature field distribution of the motor is more uniform, and the output capacity of the motor is improved.
According to another specific embodiment of the invention, the oil-cooled driving motor disclosed by the embodiment of the invention is characterized in that a plurality of end oil injection holes are respectively arranged at two ends of the inner shell corresponding to the stator winding coil; a plurality of middle oil spray holes are formed in the position, corresponding to the stator cooling gap between two adjacent sections of stator iron cores, of the inner shell; and the end oil spray holes and the middle oil spray holes are uniformly arranged along the circumferential direction of the inner shell at intervals and are communicated with the cooling oil cavity, so that the cooling oil in the cooling oil cavity is sprayed to the stator winding coil from the cooling oil cavity.
And cooling oil in the cooling oil cavity flows out from end oil spray holes positioned at two ends and is respectively sprayed to two ends of the stator winding coil, flows through the end parts of the stator core and the rotor core and enters the motor cavity to form an end part cooling loop.
The cooling oil in the cooling oil cavity flows out from the middle oil injection hole, passes through the stator cooling gap and the stator core adjacent to the stator cooling gap, is sprayed to the middle part of the stator winding coil, flows through the outer surface of the rotor core under the action of gravity, and enters the motor cavity to form a middle cooling loop. By adopting the scheme, the cooling loop cools the two ends and the middle subsection of the stator winding coil, the two ends and the middle subsection of the stator iron core, the two ends and the upper surface of the rotor iron core, and the uniformity of motor oil cooling is improved.
According to another specific embodiment of the invention, the oil-cooled driving motor disclosed by the embodiment of the invention has a rotor cooling gap formed between any two adjacent sections of rotor cores; in the middle cooling loop, cooling oil flows into the rotor cooling gap from the outer surface of the rotor core, then flows through the flow channel in the rotor core and enters the motor cavity.
By adopting the scheme, the cooling loop also cools the middle section of the rotor core, so that the uniformity of motor oil cooling is further improved.
According to another specific embodiment of the invention, the oil-cooled driving motor disclosed by the embodiment of the invention has the advantages that the center of the rotor partition plate is annular and is matched with the center of the rotor core; the periphery of the rotor partition plate is of a uniformly distributed gear-shaped structure, and a rotor cooling gap is formed between two adjacent sections of rotor cores through tooth grooves of the gear-shaped structure; the rotor cooling gap is communicated with a flow passage inside the rotor core.
According to another specific embodiment of the invention, the oil-cooled driving motor disclosed in the embodiment of the invention is characterized in that the stator partition plate adopts an annular partition plate, a plurality of grooves uniformly arranged at intervals along the circumferential direction of the stator partition plate are respectively arranged on two sides of the stator partition plate, and each groove penetrates through the stator partition plate along the radial direction of the stator partition plate; and the plurality of grooves on one side of the stator partition plate and the plurality of grooves on the other side of the stator partition plate are arranged in a staggered manner, so that a stator cooling gap is formed between two adjacent sections of stator cores.
According to another embodiment of the invention, the oil-cooled driving motor is disclosed in the embodiment of the invention, the inner circumference of the stator partition plate is provided with a uniformly distributed gear-shaped structure.
By adopting the scheme, the winding sequentially penetrates through the tooth grooves of the tooth-shaped structures of the stator core and the stator clapboard wheel, and the stator clapboard is favorably positioned and fixed.
According to another specific embodiment of the invention, the oil cooling system of the oil-cooled driving motor disclosed in the embodiment of the invention further comprises a circulating part arranged outside the housing, wherein the circulating part comprises an oil pump, a cooling and filtering mechanism and an oil storage mechanism which are sequentially connected; the oil pump is connected with the oil inlet and can drive cooling oil to enter the oil inlet; the oil storage mechanism is connected with the oil outlet and receives cooling oil flowing out of the oil outlet.
By adopting the scheme, the cooling oil is recycled, and the waste is reduced.
According to another specific embodiment of the invention, the stator partition and the rotor partition of the oil-cooled driving motor disclosed in the embodiment of the invention are made of non-magnetic high-strength oil-resistant materials.
According to another specific embodiment of the invention, the oil-cooled driving motor, the thickness of the stator partition and the rotor partition is 2-5mm.
According to another specific embodiment of the invention, the oil-cooled driving motor is disclosed in the embodiment of the invention, the number of the stator partition plates is 1-3, so that the stator core is divided into 2-4 sections in the axial direction; the number of the rotor clapboards is 1-3, and the rotor clapboards divide the axial direction of the rotor iron core into 2-4 sections.
The invention further provides an automobile which comprises the oil cooling driving motor.
By adopting the scheme, the temperature field distribution of the motor used in the automobile is more uniform, so that the output capacity of the motor is improved.
The invention has the beneficial effects that:
according to the oil-cooled driving motor, the axial sections are arranged, and the cooling loops are arranged at different axial positions and comprise the end cooling loop and the middle cooling loop, so that the axial uniformity of oil cooling of the motor can be obviously improved, the temperature field distribution of the driving motor is improved, the temperature field distribution of the motor is more uniform, and the output capacity of the motor is improved.
Drawings
Fig. 1 is a schematic cross-sectional view of an oil-cooled drive motor according to embodiment 1 of the present invention;
fig. 2 is a structural view showing a flow state of cooling oil of the oil-cooled drive motor according to embodiment 1 of the present invention;
fig. 3 is a schematic structural view of a rotor partition plate of an oil-cooled driving motor according to embodiment 1 of the present invention;
fig. 4 is a schematic structural view of a stator partition plate of the oil-cooled drive motor according to embodiment 1 of the present invention;
FIG. 5 is a schematic structural view of another stator partition (including a wheel tooth structure) of the oil-cooled drive motor according to embodiment 1 of the present invention;
fig. 6 is a block diagram schematically illustrating an oil cooling system of an oil-cooled driving motor according to embodiment 1 of the present invention.
Description of the reference numerals:
100: a housing;
110: a housing; 120: an inner shell; 130: an end cap;
200: a stator core;
210: a stator diaphragm; 211: a groove; 212: a gear tooth-like structure;
300: a stator winding coil;
400: a rotor core;
410: a rotor diaphragm;
510: an oil inlet; 520: cooling the oil cavity; 530: a cooling circuit; 531: an end cooling circuit; 5311: an end oil spray hole; 532: a middle cooling loop; 5321: a middle oil spray hole; 5322: a stator cooling gap; 5323: a rotor cooling gap; 5324: a flow channel; 540: a motor chamber; 550: an oil outlet; 560: a circulating member; 561: an oil pump; 562: a cooling and filtering mechanism; 563: an oil storage mechanism;
600: a rotating shaft;
700: and a bearing.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure. While the invention will be described in conjunction with the preferred embodiments, it is not intended that the features of the invention be limited to that embodiment. On the contrary, the invention is described in connection with the embodiments for the purpose of covering alternatives or modifications that may be extended based on the claims of the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be practiced without these particulars. Moreover, some of the specific details have been left out of the description in order to avoid obscuring or obscuring the focus of the present invention. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
It should be noted that in this specification, like reference numerals and letters refer to like items in the following drawings, and thus, once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings.
In the description of the present embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships that the product of the present invention is usually placed in when used, and are only used for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and operate, and therefore, should not be construed as limiting the present invention.
The terms "first," "second," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
In the description of the present embodiment, it should be further noted that, unless explicitly stated or limited otherwise, the terms "disposed," "connected," and "connected" are to be interpreted broadly, e.g., as a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. Specific meanings of the above terms in the present embodiment can be understood as specific cases by those of ordinary skill in the art.
To make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Example 1
The invention provides an oil-cooled driving motor, as shown in fig. 1, which comprises a shell 100, a stator core 200, a stator winding coil 300 and a rotor core 400 which are arranged in sequence from outside to inside, wherein a gap is formed between the inner wall surface of the stator winding coil 300 and the outer wall surface of the rotor core 400, two ends of the stator core 200 are respectively close to two ends of the stator winding coil 300, two ends of the rotor core 400 are respectively close to two ends of the stator winding coil 300, and the oil-cooled driving motor further comprises an oil cooling system.
The oil-cooled driving motor further includes at least one stator partition 210 and at least one rotor partition 410; the stator core 200 is divided into at least two sections of stator cores 200 by at least one stator partition 210 along the axial direction of the stator core 200, and one stator partition 210 is fixed between any two adjacent sections of stator cores 200 and forms a stator cooling gap 5322; moreover, at least one rotor diaphragm 410 divides the rotor core 400 into at least two sections of rotor cores 400 along the axial direction of the rotor core 400, one rotor diaphragm 410 of the at least one rotor diaphragm 410 is fixed between any two adjacent sections of rotor cores 400, the at least one rotor diaphragm 410 and the at least one stator diaphragm 210 are arranged in a one-to-one correspondence manner, and the rotor diaphragm 410 of the at least one rotor diaphragm 410 is aligned with the corresponding stator diaphragm 210 in the axial direction of the rotor diaphragm 410.
More specifically, the center of the motor is further provided with a rotating shaft 600 extending axially, and bearings 700 at two ends of the rotating shaft 600, the rotating shaft 600 is connected to the motor by virtue of the bearings 700, and the rotating shaft 600 drives the rotor core 400 to rotate axially around the rotating shaft 600 relative to the housing 100; the motor is further provided with an end cap 130, the end cap 130 being provided at one end of the housing 100. According to different types of motors, the motor also comprises a stator slot, a stator insulation system, rotor magnetic steel and the like. Since the stator core 200 and the corresponding rotor core 400 are divided into a plurality of sections, the motor is also divided into a plurality of sections in the corresponding axial direction; in order to reduce the encroachment of axial space, the number of segments, the thickness size and the shape of the stator partition 210 and the rotor partition 410 can be reasonably selected in combination with the application of an oil-cooled driving motor.
The oil cooling system comprises an oil inlet 510, a cooling oil chamber 520, a cooling circuit 530, a motor chamber 540 and an oil outlet 550; the housing 100 includes an outer shell 110 and an inner shell 120 sleeved from outside to inside, and the inner shell 120 surrounds the outer peripheries of the stator core 200, the stator winding coil 300 and the rotor core 400; the cooling oil chamber 520 is disposed between the outer casing 110 and the inner casing 120, and surrounds the outer periphery of the inner casing 120 in the circumferential direction of the inner casing 120, and the cooling oil chamber 520 extends in the axial direction of the inner casing 120, and both ends of the cooling oil chamber 520 are respectively close to both ends of the inner casing 120; the oil inlet 510 and the oil outlet 550 are disposed on the outer shell 110, the oil inlet 510 is communicated with the cooling oil chamber 520, the oil outlet 550 is disposed at a position of the outer shell 110, which is not connected to the inner shell 120, and is communicated with the motor chamber 540, so that the cooling oil entering from the oil inlet 510 into the cooling oil chamber 520, as shown in fig. 6, flows to the motor chamber 540 after cooling each section of the stator core 200, the stator winding coil 300 and each section of the rotor core 400 through the cooling circuit 530, and finally flows out through the oil outlet 550.
Specifically, motor chamber 540 surrounds a cavity in outer case 110 except for components such as stator core 200, stator winding coil 300, and rotor core 400, and inner case 120 circumferentially surrounds stator core 200 and is open at both ends to communicate both ends of stator core 200, stator winding coil 300, and rotor core 400 with motor chamber 540. The oil outlet 550 is formed in the housing 110 and is communicated with the motor chamber 540, and is specifically arranged at the bottom end of the housing 110, and one or more oil outlets may be arranged; as shown in fig. 1, the inner casing 120, the stator core 200, and the like are disposed in the middle of the outer casing 110 along the axial direction, and a motor chamber 540 is correspondingly formed at both ends of the outer casing 110, so that two oil outlets 550 are correspondingly disposed at the bottom end of the motor chamber 540 corresponding to the outer casing 110. The oil inlet 510 and the oil outlet 550 should be connected to a device outside the motor housing 110 for promoting the entry and storage of cooling oil, so that new cooling oil can be continuously injected, and the cooling oil can be recycled.
The cooling circuit 530 includes end cooling circuits 531 provided corresponding to both ends of the stator winding coil 300, respectively, and a middle cooling circuit 532 corresponding to a position of a portion of the stator winding coil 300 adjacent to the at least one stator diaphragm 210, the end cooling circuits 531 being configured to spray cooling oil in the cooling oil chamber 520 from positions of the cooling oil chamber 520 near both ends of the stator winding coil 300 to both ends of the stator winding coil 300, respectively, to cool both ends of the stator winding coil 300, both ends of the stator core 200, and both ends of the rotor core 400; the middle cooling circuit 532 is configured to spray cooling oil in the cooling oil chamber 520 from a position of the cooling oil chamber 520 adjacent to the at least one stator partition 210 to a middle portion of the stator winding coil 300 through the corresponding stator cooling gap 5322, respectively, to cool the middle portion of the stator winding coil 300 and the middle portion of the stator core 200.
Specifically, cooling oil cavity 520 provides a conductive structure with stator winding coil 300 end and middle stator cooling gap 5322. In the end portion cooling circuit 531, the cooling oil may be sprayed to the front end and the rear end of the stator winding coil 300 by means of the oil spray holes, and splashed to the stator core 200 and the rotor core 400 at the end portion, and the heat of the end portion of the stator winding coil 300, the stator core 200, and the rotor core 400 is taken away and then collected into the motor cavity 540. In the middle cooling loop 532, cooling oil can be sprayed into all or some of the stator cooling gaps 5322 to directly contact the middle of the stator winding coil 300 and the segmented position of the stator core 200 to remove heat, and can flow to the surface of the motor rotor to remove heat from the rotor core 400.
It should be noted that the cooling circuit 530 may be designed according to the specific design of the motor, and in the motor with less heat generation of the motor rotor and less cooling requirement, the cooling circuit 530 is relatively simple. The oil cooling driving motor can be a flat wire winding motor, a round copper wire winding motor and the like, and the corresponding rotor can be a permanent magnet rotor, a cage rotor, a winding rotor and the like.
By adopting the scheme, the cooling loops are arranged at different axial positions by arranging the axial sections, and the cooling loops comprise the end cooling loop and the middle cooling loop, so that the axial uniformity of the motor oil cooling can be obviously improved, the temperature field distribution of the driving motor is improved, the temperature field distribution of the motor is more uniform, and the output capacity of the motor is improved.
According to another embodiment of the present invention, as shown in fig. 1, a plurality of end oil spray holes 5311 are respectively disposed at two ends of the inner case 120 corresponding to the stator winding coil 300; a plurality of middle oil spray holes 5321 are formed in the inner shell 120 corresponding to the position of a stator cooling gap 5322 between two adjacent sections of stator cores 200; the plurality of end oil spray holes 5311 and the plurality of middle oil spray holes 5321 are respectively uniformly spaced along the circumferential direction of the inner case 120 and communicate with the cooling oil chamber 520, so that the cooling oil in the cooling oil chamber 520 is sprayed from the cooling oil chamber 520 toward the stator winding coil 300.
Fig. 2 identifies the routes of the cooling oil flowing through the end cooling circuit 531 and the middle cooling circuit 532, wherein the routes of the end cooling circuit 531 are indicated by black arrows and the routes of the middle cooling circuit 532 are indicated by white arrows. Cooling oil enters the cooling oil cavity 520 from the oil inlet 510, flows out of the end oil injection holes 5311 at the two ends of the cooling oil cavity 520 and is respectively sprayed to the two ends of the stator winding coil 300 and flows through the end portions of the stator core 200 and the rotor core 400 to take away heat at the two ends of the stator winding coil 300, the end portions of the stator core 200 and the rotor core 400, and finally enters the motor cavity 540 to form an end portion cooling loop 531. It should be noted that a small amount of cooling oil flows along the axial direction of the stator winding coil 300 to the outer surface of the rotor core after passing through the end of the stator winding coil 300.
The cooling oil in the cooling oil cavity 520 flows out from the middle oil injection hole 5321, passes through the stator cooling gap 5322 and the stator core 200 adjacent to the stator cooling gap 5322, is sprayed to the middle of the stator winding coil 300, takes away heat of the middle of the stator core 200 and the middle of the stator winding coil 300, flows through the outer surface of the rotor core 400 under the action of gravity, takes away heat of the surface of the rotor core 400, and finally enters the motor cavity 540 to form a middle cooling loop 532.
It should be noted that the stator winding coil 300 is wound by insulated wires (copper/aluminum, etc.) and embedded in stator slots extending from the inner periphery of the stator core, so that a gap and a stator slot structure are formed between the wires, so that the cooling oil sprayed to the stator winding coil can flow through the stator winding coil and the outer surface of the rotor core under the action of gravity. End nozzle opening 5311 and a plurality of middle part nozzle opening 5321 can be according to the size of motor, and the specific quantity and the aperture size of setting for of the condition of generating heat.
By adopting the above scheme, the cooling circuit 530 cools the two ends and the middle section of the stator winding coil 300, the two ends and the middle section of the stator core 200, the two ends and the upper surface of the rotor core 400, and improves the uniformity of motor oil cooling.
According to another embodiment of the present invention, in the oil-cooled driving motor disclosed in the embodiment of the present invention, as shown in fig. 1, a rotor cooling gap 5323 is formed between any two adjacent segments of rotor cores 400; in middle cooling circuit 532, cooling oil flows into rotor cooling gap 5323 from the outer surface of rotor core 400, carries away heat inside the middle section of rotor core 400, flows through flow channel 5324 inside rotor core 400, and enters motor cavity 540.
Specifically, the flow channel 5324 inside the rotor core 400 is a gap of the rotor core 400 near the motor shaft 600, and is communicated with the motor cavity 540. It should be noted that the rotor cooling gap 5323 is suitable for a motor with a large heat generation of the motor rotor and a high cooling requirement, and the rotor cooling gap 5323 may be formed by the structure of the rotor partition 410.
By adopting the scheme, the cooling loop also cools the middle section of the rotor core, so that the cooling uniformity of the motor oil is further improved.
According to another embodiment of the present invention, as shown in fig. 3, the center of rotor diaphragm 410 is annular and matches the center of rotor core 400; the periphery of the rotor clapboard 410 is in a uniformly distributed gear-shaped structure, and a rotor cooling gap 5323 is formed between two adjacent sections of the rotor iron cores 400 by tooth grooves between the gear-shaped structures; the rotor cooling gap 5323 communicates with a flow passage 5324 inside the rotor core 400.
Specifically, the inner diameter of the annular structure at the center of the rotor partition 410 is equal to the inner diameter of the center of the rotor core 400, and the rotor partition 410 is disposed between two adjacent rotor cores 400 and sleeved on the rotating shaft 600 together. The outer circumference of the rotor partition 410 is a gear-shaped structure extending outward from the ring-shaped structure, and the gear-shaped structure has a longer radial length than the inner circumference, so that the tooth grooves on the gear-shaped structure are communicated with the flow passage 5324, and the formed rotor cooling gap 5323 is communicated with the flow passage 5324.
According to another embodiment of the present invention, as shown in fig. 4, the stator partition 210 is an annular partition, two sides of the stator partition 210 are respectively provided with a plurality of grooves 211 uniformly spaced along the circumferential direction of the stator partition 210, each groove 211 penetrates through the stator partition 210 along the radial direction of the stator partition 210, and the plurality of grooves 211 located on one side of the stator partition 210 and the plurality of grooves 211 located on the other side of the stator partition 210 are staggered, so that a stator cooling gap 5322 is formed between two adjacent sections of the stator cores 200.
According to another embodiment of the present invention, as shown in fig. 5, the inner circumference of the stator spacer 210 is provided with uniformly distributed gear tooth-like structures 212.
By adopting the above scheme, the winding sequentially passes through the tooth slots of the gear tooth-shaped structure 212 of the stator core 200 and the stator partition 210, which is beneficial to positioning and fixing the stator partition 210.
According to another embodiment of the present invention, as shown in FIG. 6, the oil cooling system further includes a circulation part 560 provided outside the housing 100; the circulating component 560 comprises an oil pump 561, a cooling and filtering mechanism 562 and an oil storage mechanism 563 which are connected in sequence; the oil pump 561 is connected with the oil inlet 510 and can drive cooling oil to enter the oil inlet 510; oil storage mechanism 563 is connected to oil outlet 550 and receives the cooling oil flowing out of oil outlet 550.
By adopting the scheme, the cooling oil enters the oil inlet 510 by virtue of the oil pump 561, and enters the cooling oil cavity 520 through the oil inlet 510, so that the cooling oil is distributed circumferentially, and then enters the end cooling loop 531 and the middle cooling loop 532 through the communication structures arranged on the cooling oil cavity 520, such as the end oil spray holes 5311 and the middle oil spray holes 5321, so as to cool the components in the motor, collect in the motor cavity 540, and flow out from the oil outlet 550. After the cooling oil flows into the oil storage mechanism 563 from the oil outlet 550 for recycling and storing, the cooling oil enters the cooling and filtering mechanism 562 to be cooled and filtered to remove impurities, and then enters the oil inlet 510 again through the oil pump 561 to complete circulation.
By adopting the scheme, the cooling oil is recycled, and the waste is reduced.
According to another embodiment of the present invention, the stator barrier 210 and the rotor barrier 410 are made of a non-magnetic, high-strength, oil-resistant material. Specifically, the material may be a metal or nonmetal non-magnetic high-strength oil-resistant material, such as high-strength polyurethane.
According to another embodiment of the present invention, the thickness of the stator barrier 210 and the rotor barrier 410 is 2-5mm. Specifically, the stator diaphragm 210 and the rotor diaphragm 410 are uniform in thickness.
According to another embodiment of the present invention, the number of the stator partitions 10 is 1-3 to divide the axial direction of the stator core 200 into 2-4 sections; the number of the rotor diaphragms 410 is 1-3, and the rotor core 400 is divided into 2-4 sections in the axial direction. Specifically, the number of stator partitions 210 and rotor partitions 410 is the same and corresponds one to one.
Example 2
The invention also provides an automobile which comprises the oil cooling driving motor provided by the embodiment 1.
By adopting the scheme, the temperature field distribution of the motor used in the automobile is more uniform, so that the output capacity of the motor is improved.
While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that the foregoing is a more detailed description of the invention, taken in conjunction with the specific embodiments thereof, and that no limitation of the invention is intended thereby. Various changes in form and detail, including simple deductions or substitutions, may be made by those skilled in the art without departing from the spirit and scope of the invention.
Claims (9)
1. An oil-cooled driving motor comprises a shell, a stator core, a stator winding coil and a rotor core which are sequentially arranged from outside to inside, wherein a gap is formed between the inner wall surface of the stator winding coil and the outer wall surface of the rotor core, two ends of the stator core are respectively close to two ends of the stator winding coil, two ends of the rotor core are respectively close to two ends of the stator winding coil, and the oil-cooled driving motor further comprises an oil cooling system; it is characterized in that the preparation method is characterized in that,
the oil-cooled drive motor further comprises at least one stator partition and at least one rotor partition; the stator core is divided into at least two sections of stator cores by the at least one stator partition plate along the axial direction of the stator core, and the stator partition plate in the at least one stator partition plate is fixed between any two adjacent sections of the stator cores; the stator partition board is an annular partition board, a plurality of grooves which are uniformly arranged at intervals along the circumferential direction of the stator partition board are respectively arranged on two sides of the stator partition board, and each groove penetrates through the stator partition board along the radial direction of the stator partition board; the plurality of grooves on one side of the stator partition plate and the plurality of grooves on the other side of the stator partition plate are arranged in a staggered mode, so that a stator cooling gap is formed between two adjacent sections of stator iron cores; the rotor core is divided into at least two sections of rotor cores by the at least one rotor partition plate along the axial direction of the rotor core, the rotor partition plate in the at least one rotor partition plate is fixed between any two adjacent sections of the rotor cores, the at least one rotor partition plate and the at least one stator partition plate are arranged in a one-to-one correspondence manner, and the rotor partition plate of the at least one rotor partition plate and the corresponding stator partition plate are aligned in the axial direction of the rotor partition plate;
the oil cooling system comprises an oil inlet, a cooling oil cavity, a cooling loop, a motor cavity and an oil outlet;
the shell comprises an outer shell and an inner shell which are sleeved from outside to inside, and the inner shell surrounds the peripheries of the stator iron core, the stator winding coil and the rotor iron core;
the cooling oil cavity is arranged between the outer shell and the inner shell and surrounds the periphery of the inner shell along the circumferential direction of the inner shell, the cooling oil cavity extends along the axial direction of the inner shell, and two ends of the cooling oil cavity are close to two ends of the inner shell respectively; the oil inlet and the oil outlet are arranged on the outer shell, the oil inlet is communicated with the cooling oil cavity, the oil outlet is arranged at the position, which is not connected with the inner shell, of the outer shell and is communicated with the motor cavity, so that cooling oil entering the cooling oil cavity from the oil inlet flows to the motor cavity after cooling each section of the stator core, the stator winding coil and each section of the rotor core through the cooling circuit, and finally flows out through the oil outlet;
the cooling circuit comprises end cooling circuits which are respectively arranged corresponding to two ends of the stator winding coil and a middle cooling circuit which corresponds to the position of the stator winding coil adjacent to the at least one stator clapboard; a plurality of end oil spray holes are respectively formed in the inner shell corresponding to two ends of the stator winding coil; a plurality of middle oil injection holes are formed in the inner shell corresponding to the position of the stator cooling gap between two adjacent sections of the stator cores; the end oil injection holes and the middle oil injection holes are uniformly arranged along the circumferential direction of the inner shell at intervals and are communicated with the cooling oil cavity, so that cooling oil in the cooling oil cavity is sprayed to the stator winding coil from the cooling oil cavity;
cooling oil in the cooling oil cavity flows out of the end oil injection holes at the two ends and is respectively sprayed to the two ends of the stator winding coil, flows through the end parts of the stator core and the rotor core and enters the motor cavity to form the end part cooling loop so as to cool the two ends of the stator winding coil, the two ends of the stator core and the two ends of the rotor core;
and cooling oil in the cooling oil cavity flows out from the middle oil spray hole, passes through the stator cooling gap and the stator core adjacent to the stator cooling gap, is sprayed to the middle part of the stator winding coil, flows through the outer surface of the rotor core under the action of gravity, enters the motor cavity, and forms a middle cooling loop so as to cool the middle part of the stator winding coil and the middle part of the stator core.
2. The oil-cooled drive motor of claim 1, wherein a rotor cooling gap is formed between any two adjacent segments of the rotor cores; in the middle cooling loop, the cooling oil flows into the rotor cooling gap from the outer surface of the rotor core, then flows through the flow channel in the rotor core and enters the motor cavity.
3. The oil-cooled drive motor of claim 2, wherein the center of the rotor diaphragm is annular and matches the center of the rotor core; the periphery of the rotor partition plate is of a uniformly distributed gear-shaped structure, and a rotor cooling gap is formed between two adjacent sections of the rotor iron cores through tooth sockets of the gear-shaped structure; the rotor cooling gap is communicated with the runner inside the rotor core.
4. An oil cooled drive motor as claimed in claim 1 wherein the inner periphery of the stator diaphragm is provided as a uniformly distributed gear tooth like structure.
5. The oil-cooled driving motor according to claim 1, wherein the oil cooling system further comprises a circulating part disposed outside the housing, the circulating part including an oil pump, a cooling filter mechanism, and an oil storage mechanism connected in sequence; wherein the content of the first and second substances,
the oil pump is connected with the oil inlet and can drive cooling oil to enter the oil inlet; the oil storage mechanism is connected with the oil outlet and receives the cooling oil flowing out of the oil outlet.
6. The oil-cooled drive motor of any one of claims 1-5, wherein the stator diaphragm and the rotor diaphragm are made of a non-magnetic, high-strength, oil-resistant material.
7. An oil cooled drive motor as claimed in claim 6 wherein said stator diaphragm and said rotor diaphragm have a thickness of 2-5mm.
8. The oil-cooled driving motor as claimed in any one of claims 1 to 5, wherein the number of the stator diaphragms is 1 to 3 to divide the axial direction of the stator core into 2 to 4 sections;
the number of the rotor clapboards is 1-3, and the rotor clapboard axially divides the rotor iron core into 2-4 sections.
9. An automobile, characterized by comprising the oil-cooled drive motor according to any one of claims 1 to 8.
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| CN114448151A (en) * | 2021-12-23 | 2022-05-06 | 湖南聚源电驱智能装备有限公司 | Cooling system of new energy automobile hub motor |
| CN114337015B (en) * | 2021-12-31 | 2023-07-25 | 华中科技大学 | High-power density motor with stator oil immersion cooling structure |
| CN114567102B (en) * | 2022-03-03 | 2023-07-11 | 苏州睿控电动有限公司 | Oil cooling motor rotor cooling structure |
| CN115133718A (en) * | 2022-06-21 | 2022-09-30 | 亿航智能设备（广州）有限公司 | External rotor motor |
| CN115967208B (en) * | 2023-03-16 | 2023-05-12 | 四川宜宾力源电机有限公司 | New energy automobile mixes cooled motor |
| CN116054441A (en) * | 2023-04-01 | 2023-05-02 | 博格华纳汽车零部件（武汉）有限公司 | Driving motor stator oil cooling structure and oil cooling method thereof |
| CN117318356A (en) * | 2023-11-30 | 2023-12-29 | 小米汽车科技有限公司 | Motor and vehicle |
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| JP2007215307A (en) * | 2006-02-08 | 2007-08-23 | Shinko Electric Co Ltd | Cooling mechanism and cooling method of rotary electric machine |
| CN202142920U (en) * | 2011-07-20 | 2012-02-08 | 苏州泰铎电气有限公司 | An inner rotor core of a surface-mount permanent magnet motor, and segmental assemblies of the inner rotor core |
| CN103746485B (en) * | 2013-12-24 | 2016-08-31 | 上海电机系统节能工程技术研究中心有限公司 | A kind of cooling structure of permagnetic synchronous motor |
| CN105322717B (en) * | 2014-07-28 | 2018-08-07 | 重庆美的通用制冷设备有限公司 | Centrifugal compressor motor |
| CN107276266B (en) * | 2017-08-02 | 2019-04-23 | 华中科技大学 | A kind of two-way cooling oil-cooled motor |
| CN208691089U (en) * | 2018-09-07 | 2019-04-02 | 东莞骏捷机电设备有限公司 | A kind of cold servo motor of oil |
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