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CN113746228A - Electric machine - Google Patents

Electric machine Download PDF

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Publication number
CN113746228A
CN113746228A CN202110967096.9A CN202110967096A CN113746228A CN 113746228 A CN113746228 A CN 113746228A CN 202110967096 A CN202110967096 A CN 202110967096A CN 113746228 A CN113746228 A CN 113746228A
Authority
CN
China
Prior art keywords
stator
stator core
channel
axial
electric machine
Prior art date
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.)
Pending
Application number
CN202110967096.9A
Other languages
Chinese (zh)
Inventor
林佳佳
林楚辉
林建洪
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangdong Jinba Intelligent Technology Co ltd
Original Assignee
Guangdong Jinba Intelligent Technology Co ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Guangdong Jinba Intelligent Technology Co ltd filed Critical Guangdong Jinba Intelligent Technology Co ltd
Priority to CN202110967096.9A priority Critical patent/CN113746228A/en
Publication of CN113746228A publication Critical patent/CN113746228A/en
Pending legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K1/00Details of the magnetic circuit
    • H02K1/06Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12Stationary parts of the magnetic circuit
    • H02K1/16Stator cores with slots for windings
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K1/00Details of the magnetic circuit
    • H02K1/06Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12Stationary parts of the magnetic circuit
    • H02K1/20Stationary parts of the magnetic circuit with channels or ducts for flow of cooling medium
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K5/00Casings; Enclosures; Supports
    • H02K5/04Casings or enclosures characterised by the shape, form or construction thereof
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K9/00Arrangements for cooling or ventilating
    • H02K9/19Arrangements 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)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

The invention relates to a motor, comprising a stator and a rotor; the stator comprises an annular shell, a stator core mounted on the inner wall of the shell and a stator winding wound on the stator core; the rotor is rotatably mounted to the stator and surrounded by the stator core; the motor further comprises a cooling structure and a cooling liquid, wherein the cooling structure comprises an external channel, an internal channel and a middle channel; the external channel is positioned on the periphery of the stator core and spans the circumferential direction and the axial direction of the stator core; the internal channel is located inside the stator core; the middle channel is connected between the outer channel and the inner channel in series; the cooling liquid is filled into the cooling structure and sealed inside the housing. The invention can quickly dissipate the heat generated by the stator winding and other heat sources, and effectively reduce the working temperature of the motor.

Description

Electric machine
[ technical field ] A method for producing a semiconductor device
The invention relates to the field of motors, in particular to a heat dissipation scheme of a motor.
[ background of the invention ]
One type of prior art electric machine includes an outer stator and an inner rotor rotatably mounted inside the outer stator. The outer stator includes a stator core and a stator winding. When the motor works, the stator winding can generate heat, the internal temperature of the motor is high, and if the temperature is too high, the motor is easy to break down, or the service life of the motor is obviously shortened.
[ summary of the invention ]
The invention aims to reduce the working temperature of the stator and the rotor of the motor.
To this end, the invention provides an electric machine comprising a stator and a rotor; the stator comprises an annular shell, a stator core mounted on the inner wall of the shell and a stator winding wound on the stator core; the rotor is rotatably mounted to the stator and surrounded by the stator core; the motor further comprises a cooling structure and a cooling liquid, wherein the cooling structure comprises an external channel, an internal channel and a middle channel; the external channel is formed by the depression of the outer peripheral surface of the stator core, and the external channel spans the circumferential direction and the axial direction of the stator core; the internal channel is positioned on the inner side of the stator core and is connected with the stator winding; the middle channel is positioned at the end part of the stator core and is connected in series between the external channel and the internal channel; the cooling liquid is filled into the cooling structure and sealed inside the housing.
Preferably, the cooling fluid in the external passage is in contact with an inner wall of the housing for transferring heat to the housing.
As a preferred scheme, the external passage includes an annular groove and a plurality of axial grooves formed in the outer peripheral surface of the stator core, the annular groove surrounds the outer peripheral surface of the stator core, the plurality of axial grooves are distributed in the circumferential direction of the stator core and communicated with the annular groove, and the axial grooves penetrate through the stator core in the axial direction of the stator core.
As a preferable scheme, two ends of the plurality of axial grooves are connected with the middle channel.
As a preferable scheme, the external passage further includes an axial guide groove, the axial guide groove penetrates through the stator core along an axial direction of the stator core, the axial guide groove intersects with the annular groove, and a recess depth of the axial guide groove and the annular groove is greater than a recess depth of the axial groove.
Preferably, the widths of the axial guide groove and the annular groove are both greater than the recess depth of the axial groove.
As a preferable scheme, the shell is provided with a liquid injection port for injecting the cooling liquid; the liquid injection port is opposite to the intersection of the annular groove and the axial guide groove.
As a preferred scheme, the stator core comprises an annular magnetic yoke and a plurality of stator teeth extending inwards from the magnetic yoke, and wire slots are formed between adjacent stator teeth; the stator winding is wound to the stator teeth and falls into the wire slot; the wire slots serve as or part of the internal passage to enable coolant located in the internal passage to contact the stator windings.
Preferably, a gap is formed between the rotor and the stator core to allow the rotor to rotate relative to the stator; the gap serves as a portion of the internal passage.
Preferably, the stator core is formed by stacking a plurality of stator laminations in the axial direction of the motor, and notches are arranged at corresponding positions on the periphery of the stator laminations to directly form the external channel after stacking.
The motor is filled with cooling liquid, and the internal cooling structure comprises the external channel, the internal channel and the middle channel, so that heat generated by a heat source in the motor can be quickly dissipated, and the working temperature of the motor is effectively reduced.
[ description of the drawings ]
Fig. 1 is a partial schematic view of an outer stator motor according to a first embodiment of the present invention;
FIG. 2 is a schematic plan view of the assembly shown in FIG. 1;
fig. 3 is a schematic view of a stator core of the motor shown in fig. 1.
[ detailed description ] embodiments
The invention is further described below with reference to the figures and examples.
Referring to fig. 1, a motor 100 according to an embodiment of the present invention includes a stator and a rotor, wherein the stator includes a housing 10, a stator core 20 mounted to an inner wall of the housing 10, a stator winding (not shown) wound around the stator core 20, and the like. End covers are arranged at two ends of the shell 10, and bearing seats are arranged on the end covers and used for mounting rotors. The rotor (not shown) includes a rotation shaft, a rotor core fixedly fitted to the rotation shaft, and a permanent magnet fixed to the rotor core. The rotor is rotatably mounted to the end cover of the housing 10 by a rotating shaft such that the rotor core is surrounded by the stator core 20.
The motor 100 also includes a cooling structure and a cooling fluid therein. The housing 10 is provided with a liquid injection port 11 for injecting a coolant into the motor 100, and the coolant can flow to the axial end portion of the stator core 20 through the axial groove 34 on the outer side of the stator core 20 and into the inner side of the stator core 20. In this way, the cooling liquid can transfer heat inside the motor to the housing 10 and finally be dissipated to the outside through the housing 10, thereby timely reducing the internal temperature of the motor 100. When the motor 100 operates, the rotating rotor disturbs the cooling fluid, thereby promoting the flow of the cooling fluid and further accelerating the heat dissipation of the motor 100.
Referring to fig. 1 to 3, the cooling structure of the motor 100 includes an outer passage, an inner passage, and a middle passage. The external passages are formed by depressions of the corresponding positions of the outer peripheral surface of the stator core 20, and the external passages span the circumferential direction and the axial direction of the stator core 20. Specifically, the external passage includes an annular groove 31 formed in the outer circumferential surface of the stator core 20 and a plurality of axial grooves 34, the annular groove 34 surrounding the outer circumferential surface of the stator core 20, the plurality of axial grooves 34 being distributed along the circumferential direction of the stator core 20 and communicating with the annular groove 31, the axial grooves 34 penetrating the stator core 20 in the axial direction of the stator core 20. In order to increase the liquid injection speed of the cooling liquid, an axial guide groove 32 may be additionally provided, the axial guide groove 32 is parallel to the axial groove 34 and penetrates through the stator core 20 along the axial direction of the stator core 20, and the axial guide groove 32 intersects with the annular groove 31. Preferably, the liquid injection port 11 of the housing 10 faces the annular groove 31 or the axial guide groove 32; more preferably, the pouring outlet 11 of the casing 10 faces the intersection of the annular groove 31 and the axial guide groove 32.
In this embodiment, the axial guide grooves 32 and the annular grooves 31 have a recess depth substantially the same as each other, and are larger than the recess depth of the axial grooves 34, so as to facilitate the flow of the cooling liquid. The widths of the axial guide grooves 32 and the annular grooves 31 are larger than the recessed depth of the axial grooves 34, so that the fluidity of the cooling liquid is improved. The number of the axial grooves 34 is large to increase the contact area of the cooling liquid with the stator core 20, and preferably, the width occupied by the adjacent three axial grooves 34 is equal to the width of the axial guide grooves 32.
Understandably, the cooling liquid located in the external passage is simultaneously in contact with the inner wall of the casing 10, facilitating the transfer of heat to the casing 10.
The internal passages are located inside the stator core 20 and are in contact with the stator windings. The middle passage is located outside the two ends of the stator core 20 and is connected in series between the outer passage and the inner passage. For example, the middle passages outside both end portions of the stator core 20 are connected to both ends of the axial grooves 34, respectively.
In this embodiment, the stator core 20 includes an annular yoke 21, and a plurality of stator teeth 23 extending inward from the yoke 21, and a slot 24 is formed between adjacent stator teeth 23. The stator winding is wound on the stator teeth 23 and falls into the wire slot 24; the wire slots 24 serve as internal passages or portions of internal passages to allow coolant located in the internal passages to contact the stator windings to dissipate heat from the stator windings. Because the stator windings are the primary heat source during operation of the motor 100, this design further enhances heat dissipation.
It will be appreciated that a gap is formed between the rotor core and the stator core 20 as part of the internal passage to permit rotation of the rotor relative to the stator. Thus, when the motor 100 operates, the rotating rotor disturbs the cooling liquid, thereby promoting the flow of the cooling liquid and further accelerating the heat dissipation of the motor 100.
In the present embodiment, the stator core 20 is formed by stacking a plurality of stator laminations in the axial direction of the motor 100. The corresponding position of the stator lamination periphery is provided with a notch to directly form an external channel after the lamination. In this embodiment, the stator core 20 shown in fig. 3 can be stacked using two types of stator laminations, specifically: one stator lamination forms the portion of the stator core 20 having the annular groove 31 and the other stator lamination forms the other portion of the stator core 20.
The above examples merely represent preferred embodiments of the present invention, which are described in more detail and detail, but are not to be construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications, such as combinations of different features in various embodiments, may be made without departing from the spirit of the invention, and these are within the scope of the invention.

Claims (10)

1. An electric machine comprising a stator and a rotor; the stator comprises an annular shell, a stator core mounted on the inner wall of the shell and a stator winding wound on the stator core; the rotor is rotatably mounted to the stator and surrounded by the stator core; the motor is characterized by further comprising a cooling structure and cooling liquid, wherein the cooling structure comprises an external channel, an internal channel and a middle channel; the external channel is formed by the depression of the outer peripheral surface of the stator core, and the external channel spans the circumferential direction and the axial direction of the stator core; the internal channel is located inside the stator core; the middle channel is positioned at the end part of the stator core and is connected in series between the external channel and the internal channel; the cooling liquid is filled into the cooling structure and sealed inside the housing.
2. The machine of claim 1 wherein the coolant in the external channel contacts an inner wall of the housing for transferring heat to the housing.
3. The electric machine of claim 1, wherein the external passage includes an annular groove formed in an outer peripheral surface of the stator core, the annular groove surrounding the outer peripheral surface of the stator core, and a plurality of axial grooves distributed in a circumferential direction of the stator core and communicating with the annular groove, the axial grooves penetrating the stator core in an axial direction of the stator core.
4. The electric machine of claim 3 wherein said axial grooves are connected at both ends to said central channel.
5. The electric machine of claim 3, wherein the outer channel further comprises an axial guide slot that extends through the stator core in an axial direction of the stator core, the axial guide slot intersecting the annular groove, a recess depth of the axial guide slot and the annular groove being greater than a recess depth of the axial groove.
6. The electric machine of claim 5 wherein the width of each of the axial guide slot and the annular groove is greater than the recess depth of the axial groove.
7. The electric machine of claim 5, wherein the housing is provided with a liquid injection port for injecting the cooling liquid; the liquid injection port is opposite to the intersection of the annular groove and the axial guide groove.
8. The electric machine of claim 1, wherein the stator core includes an annular yoke, a plurality of stator teeth extending inwardly from the yoke, adjacent stator teeth forming wire slots therebetween; the stator winding is wound to the stator teeth and falls into the corresponding wire slot; the wire slots serve as or part of the internal passage to enable coolant located in the internal passage to contact the stator windings.
9. The electric machine of claim 8 wherein a gap is formed between the rotor and the stator core to permit rotation of the rotor relative to the stator; the gap serves as a portion of the internal passage.
10. The electric machine of claim 1 wherein said stator core is formed by stacking a plurality of stator laminations in the axial direction of the machine, said stator laminations having notches at corresponding locations on the outer periphery thereof to form said external channels directly after stacking.
CN202110967096.9A 2021-08-23 2021-08-23 Electric machine Pending CN113746228A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110967096.9A CN113746228A (en) 2021-08-23 2021-08-23 Electric machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110967096.9A CN113746228A (en) 2021-08-23 2021-08-23 Electric machine

Publications (1)

Publication Number Publication Date
CN113746228A true CN113746228A (en) 2021-12-03

Family

ID=78732242

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110967096.9A Pending CN113746228A (en) 2021-08-23 2021-08-23 Electric machine

Country Status (1)

Country Link
CN (1) CN113746228A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114301216A (en) * 2021-12-22 2022-04-08 东部超导科技(苏州)有限公司 Heat radiation assembly and superconducting motor with built-in heat radiation assembly

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004112968A (en) * 2002-09-20 2004-04-08 Nissan Motor Co Ltd Cooling structure for rotary electric machine
CN210985872U (en) * 2019-12-24 2020-07-10 明程电机技术(深圳)有限公司 Iron core and motor formed by same
CN113178989A (en) * 2021-04-28 2021-07-27 哈尔滨工业大学 Evaporative cooling motor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004112968A (en) * 2002-09-20 2004-04-08 Nissan Motor Co Ltd Cooling structure for rotary electric machine
CN210985872U (en) * 2019-12-24 2020-07-10 明程电机技术(深圳)有限公司 Iron core and motor formed by same
CN113178989A (en) * 2021-04-28 2021-07-27 哈尔滨工业大学 Evaporative cooling motor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114301216A (en) * 2021-12-22 2022-04-08 东部超导科技(苏州)有限公司 Heat radiation assembly and superconducting motor with built-in heat radiation assembly

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Application publication date: 20211203