CN112152345A - Motor cooling system and motor - Google Patents

Motor cooling system and motor Download PDF

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Publication number
CN112152345A
CN112152345A CN202011121001.3A CN202011121001A CN112152345A CN 112152345 A CN112152345 A CN 112152345A CN 202011121001 A CN202011121001 A CN 202011121001A CN 112152345 A CN112152345 A CN 112152345A
Authority
CN
China
Prior art keywords
cooling
radial
motor
axial
magnetic steel
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
CN202011121001.3A
Other languages
Chinese (zh)
Inventor
张芳
龚高
王珊珊
彭利明
熊博文
龚从勇
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.)
Gree Electric Appliances Inc of Zhuhai
Original Assignee
Gree Electric Appliances Inc of Zhuhai
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 Gree Electric Appliances Inc of Zhuhai filed Critical Gree Electric Appliances Inc of Zhuhai
Priority to CN202011121001.3A priority Critical patent/CN112152345A/en
Publication of CN112152345A publication Critical patent/CN112152345A/en
Pending legal-status Critical Current

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    • 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
    • H02K1/00Details of the magnetic circuit
    • H02K1/06Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22Rotating parts of the magnetic circuit
    • H02K1/27Rotor cores with permanent magnets
    • H02K1/2706Inner rotors
    • H02K1/272Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/278Surface mounted magnets; Inset magnets
    • 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
    • H02K1/22Rotating parts of the magnetic circuit
    • H02K1/32Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium

Abstract

The invention relates to the technical field of surface-mounted permanent magnet motors, in particular to a motor cooling system and a motor. This motor cooling system includes: the cooling structure comprises a shell, a stator, a sheath, magnetic steel and a rotating shaft which are sequentially arranged from outside to inside, wherein the magnetic steel is formed by sequentially splicing a plurality of magnetic steel sections, two end faces of each magnetic steel section are respectively provided with a radial cooling groove, every two adjacent radial cooling grooves form a first radial cooling hole, and a plurality of cooling passages penetrate through the plurality of first radial cooling holes in the direction towards the shell; when needs cool off the rotor, only need with in the coolant lets in the cooling passage can, coolant will get into in the first radial cooling hole via the cooling passage this moment to the realization cools off the magnet steel, and then realizes the inside abundant cooling to the rotor, and will effectively reduce the turbine loss of magnet steel with the segmented design of magnet steel, and then effectively avoid the permanent magnet high temperature, guarantee the normal work of rotor.

Description

Motor cooling system and motor
Technical Field
The invention relates to the technical field of surface-mounted permanent magnet motors, in particular to a motor cooling system and a motor.
Background
Compared with an electrically excited motor, the permanent magnet motor has the advantages of small volume, simple structure, reliable operation, low loss, high efficiency and the like, so the permanent magnet motor is widely used, especially a rare earth permanent magnet motor; however, in the case of a permanent magnet motor, when the temperature of the rotor is too high, if the heat cannot be dissipated in time, the permanent magnet may be irreversibly demagnetized, and the rotor of the motor may not be used.
Disclosure of Invention
An object of the application is to provide a motor cooling system and motor to when solving among the prior art when the rotor temperature rise is too high, if this heat can't in time be dispelled, then can cause the permanent magnet to appear the problem of irreversible demagnetization phenomenon.
Technical scheme (I)
To achieve the above object, a first aspect of the present invention provides a motor cooling system including: casing, stator, sheath, magnet steel and pivot that from outer to interior set gradually, the magnet steel is spliced in proper order by a plurality of magnet steel section and is formed, every radial cooling bath has all been seted up to two terminal surfaces of magnet steel section, every adjacent two radial cooling bath all constitutes first radial cooling hole, along a plurality of first radial cooling hole to the direction of casing runs through has a plurality of cooling passage.
Optionally, the cooling passage includes:
the cooling medium inlet is arranged on the shell;
the second radial cooling hole is formed in the stator and communicated with the cooling medium inlet;
and the third radial cooling hole is formed in the jacket and is respectively communicated with the first radial cooling hole and the second radial cooling hole.
Optionally, the inner wall surface of the sheath is further provided with a plurality of axial cooling grooves, and each axial cooling groove is intersected with the corresponding third radial cooling hole.
Optionally, the end surface of the rotating shaft is further provided with a first axial cooling hole communicated with the axial cooling groove.
Optionally, a plurality of first circumferential cooling grooves are further formed in the outer wall surface of the matching section of the rotating shaft and the inner wall surface of the sheath.
Optionally, the outer wall surface of the sheath is provided with a second circumferential cooling groove communicated with the plurality of third radial cooling holes.
Optionally, the magnetic steel is annular magnetic steel, a plurality of second axial cooling holes are formed in the rotating shaft in the direction close to the end portion, and the second axial cooling holes are communicated with the first radial cooling holes.
Optionally, the second axial cooling hole is in contact with the magnetic poles on the annular magnetic steel, and the number of the second axial cooling holes is matched with that of the magnetic poles.
Optionally, a water cooling channel for cooling the stator is further disposed on the casing.
To achieve the above object, a second aspect of the present invention provides a motor comprising: the motor cooling system of any preceding claim.
(II) advantageous effects
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a motor cooling system and a motor, comprising: the cooling structure comprises a shell, a stator, a sheath, magnetic steel and a rotating shaft which are sequentially arranged from outside to inside, wherein the magnetic steel is formed by sequentially splicing a plurality of magnetic steel sections, two end faces of each magnetic steel section are respectively provided with a radial cooling groove, every two adjacent radial cooling grooves form a first radial cooling hole, and a plurality of cooling passages penetrate through the plurality of first radial cooling holes in the direction towards the shell; when needs cool off the rotor, only need with in the coolant lets in the cooling passage can, coolant will get into in the first radial cooling hole via the cooling passage this moment to the realization cools off the magnet steel, and then realizes the inside abundant cooling to the rotor, and will effectively reduce the turbine loss of magnet steel with the segmented design of magnet steel, and then effectively avoid the permanent magnet high temperature, guarantee the normal work of rotor.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for a person skilled in the art that other drawings can be obtained according to the drawings without inventive exercise, wherein:
FIG. 1 is a schematic diagram of a cooling system for an electric machine according to one embodiment of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at position A;
FIG. 3 is a schematic structural view of one embodiment of a rotor according to the present invention;
FIG. 4 is a schematic structural diagram of one embodiment of a magnetic steel segment in the invention;
FIG. 5 is a schematic structural view of one embodiment of a rotating shaft according to the present invention;
FIG. 6 is a schematic view of the construction of the sheath of the present invention;
FIG. 7 is a schematic structural diagram of another embodiment of the motor cooling system of the present invention;
FIG. 8 is a schematic structural diagram of another embodiment of a magnetic steel segment according to the present invention;
fig. 9 is a schematic structural view of another embodiment of the hinge of the present invention.
In the figure: 1. a housing; 2. a stator; 3. a sheath; 4. a magnetic steel segment; 5. a rotating shaft; 6. a radial cooling groove; 7. a first radial cooling hole; 8. a cooling medium inlet; 9. a second radial cooling hole; 10. a third radial cooling hole; 11. an axial cooling groove; 12. a first axial cooling hole; 13. a first circumferential cooling bath; 14. a second circumferential cooling groove; 15. a second axial cooling hole.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The invention is described in further detail below with reference to the following figures and detailed description:
as shown in fig. 1 to 9, a first aspect of the present application provides an electric machine cooling system including: from outer casing 1 that sets gradually to interior, stator 2, sheath 3, magnet steel and pivot 5, the magnet steel is formed by a plurality of magnet steel section 4 concatenation in proper order, as shown in fig. 2 and fig. 4, radial cooling bath 6 has all been seted up to two terminal surfaces of every magnet steel section 4, every two adjacent radial cooling baths 6 all constitute first radial cooling hole 7, this first radial cooling hole 7 is used for introducing cooling medium inside the rotor, thereby realize cooling the magnet steel, it has a plurality of cooling passage to run through to casing 1's direction along the first radial cooling hole 7 of a plurality of, in addition, radial cooling bath 6 can also play the parallel positioning action that magnetizes, and the segmented design of magnet steel plays the effect that can also reduce the rotor loss.
When needs cool off the rotor, only need with in the coolant lets in the cooling passage can, coolant will get into in the first radial cooling hole via the cooling passage this moment to the realization cools off the magnet steel, and then realizes the inside abundant cooling to the rotor, and will effectively reduce the turbine loss of magnet steel with the segmented design of magnet steel, and then effectively avoid the permanent magnet high temperature, guarantee the normal work of rotor.
Specifically, the cooling passage includes:
the cooling medium inlet 8 is arranged on the machine shell 1;
the cooling medium circulating outlet can be arranged on the shell or on the end cover according to actual needs.
The second radial cooling hole 9 is formed in the stator 2 and communicated with the cooling medium inlet 8;
the third radial cooling holes 10 are formed in the sheath 3 and are respectively communicated with the first radial cooling holes 7 and the second radial cooling holes 9, and the outer wall surface of the sheath 3 is provided with second circumferential cooling grooves 14 communicated with the plurality of third radial cooling holes 10; in addition, in this embodiment, the design of slotting in the sheath can further reduce the loss of the rotor, and preferably, the sheath is made of an alloy material or a fiber composite material.
When needs cool off the rotor, only need with in the coolant lets in the cooling passage can, coolant will be via coolant import 8, the radial cooling hole of second 9, the radial cooling hole of third 10 in proper order this moment, get into in the first radial cooling hole 7 at last, thereby realize cooling the magnet steel, and then realize the abundant cooling to the rotor inside, and will effectively reduce the turbine loss of magnet steel with the segmented design of magnet steel, and then effectively avoid the permanent magnet high temperature, guarantee the normal work of rotor.
According to an embodiment of the present invention, in order to further cool the inside of the rotor, that is, the rotating shaft, as shown in fig. 6, the inner wall surface of the sheath 3 is further provided with a plurality of axial cooling grooves 11, and each axial cooling groove 11 intersects with a corresponding third radial cooling hole 10; as shown in fig. 5 and 9, the end surface of the rotating shaft 5 is further provided with a first axial cooling hole 12 communicated with the axial cooling groove 11; as shown in fig. 1, during cooling, a cooling medium enters the axial cooling groove 11 through the third radial cooling hole 10, and then the cooling medium flows to the end portion of the rotating shaft along the axial cooling groove 11 until the cooling medium flows into the first axial cooling hole 12, so as to achieve sufficient cooling of the rotating shaft, as shown in fig. 9, the embodiment is a solid magnetic steel surface-mounted motor, the rotating shaft is provided with a front short shaft and a rear short shaft, the two short shafts are arranged at two ends of the solid magnetic steel, and in order to ensure sufficient cooling of the two short shafts, the first axial cooling hole 12 is formed in each of the two short shafts.
According to an embodiment of the present invention, in order to further achieve sufficient cooling of the rotating shaft, as shown in fig. 5 and 9, a plurality of first circumferential cooling grooves 13 are further formed on an outer wall surface of a matching section of the rotating shaft 5 and an inner wall surface of the sheath 3, specifically, the first circumferential cooling grooves 13 are communicated with the axial cooling grooves 11, and a cooling medium flowing out through the axial cooling grooves 11 enters the first circumferential cooling grooves 13, so as to further achieve further cooling of the rotating shaft.
According to an embodiment of the present invention, as shown in fig. 5, the embodiment is an annular magnetic steel surface-mount motor, the magnetic steel is configured as annular magnetic steel, a plurality of second axial cooling holes 15 are formed in the rotating shaft 5 along a direction close to the end, and the second axial cooling holes 15 are communicated with the first radial cooling holes 7; preferably, the number of the second axial cooling holes 15 is matched with the number of the magnetic poles arranged on the annular magnetic steel; the second axial cooling hole 15 guides the cooling medium introduced from the first radial cooling hole 7 to the position between the magnetic steel and the rotating shaft, and simultaneously changes the trend of magnetic lines of force near the magnetic pole, thereby improving the self demagnetization resistance of the rotating shaft.
According to an embodiment of the present invention, in order to cool the stator, a water cooling channel for cooling the stator 2 is further provided on the casing 1; the water cooling channel can be arranged on the shell in a circumferential or spiral mode.
A second aspect of the present application provides an electric machine comprising: a motor cooling system as in any preceding claim.
The embodiments in the present description are all described in a progressive manner, and some of the embodiments are mainly described as different from other embodiments, and the same and similar parts among the embodiments can be referred to each other.
In the description of the present invention, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", and the like are used for descriptive purposes only and are not to be construed as indicating or implying importance; the words "bottom" and "top", "inner" and "outer" refer to directions toward and away from, respectively, a particular component geometry.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the communication may be direct, indirect via an intermediate medium, or internal to both elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. An electric machine cooling system, comprising: casing (1), stator (2), sheath (3), magnet steel and pivot (5) that set gradually by outer to interior, the magnet steel is spliced in proper order by a plurality of magnetic steel section (4) and is formed, every radial cooling bath (6), every adjacent two radial cooling bath (6) all constitute first radial cooling hole (7), along a plurality of first radial cooling hole (7) to the direction of casing (1) is run through and is had a plurality of cooling passage.
2. The electric machine cooling system of claim 1, wherein the cooling passage comprises:
the cooling medium inlet (8) is arranged on the shell (1);
the second radial cooling hole (9) is formed in the stator (2) and communicated with the cooling medium inlet (8);
and the third radial cooling hole (10) is formed in the sheath (3) and is communicated with the first radial cooling hole (7) and the second radial cooling hole (9) respectively.
3. The motor cooling system according to claim 2, wherein the inner wall surface of the sheath (3) is further provided with a plurality of axial cooling grooves (11), and each axial cooling groove (11) intersects with the corresponding third radial cooling hole (10).
4. The motor cooling system according to claim 3, wherein the end face of the rotating shaft (5) is further provided with a first axial cooling hole (12) communicated with the axial cooling groove (11).
5. The motor cooling system according to claim 1, wherein a plurality of first circumferential cooling grooves (13) are further formed in the outer wall surface of the matching section of the rotating shaft (5) and the inner wall surface of the sheath (3).
6. The motor cooling system according to claim 2, wherein the outer wall surface of the jacket (3) is provided with a second circumferential cooling groove (14) communicating with the plurality of third radial cooling holes (10).
7. The motor cooling system according to claim 1, wherein the magnetic steel is annular magnetic steel, a plurality of second axial cooling holes (15) are formed in the rotating shaft (5) along a direction close to the end portion, and the second axial cooling holes (15) are communicated with the first radial cooling holes (7).
8. The motor cooling system according to claim 7, characterized in that the second axial cooling holes (15) are in contact with the poles of the annular magnetic steel, and the number of the second axial cooling holes is adapted to the number of the poles.
9. The motor cooling system according to claim 1, characterized in that a water cooling channel for cooling the stator (2) is further provided on the casing (1).
10. An electric machine, comprising: the motor cooling system of any one of claims 1-9.
CN202011121001.3A 2020-10-19 2020-10-19 Motor cooling system and motor Pending CN112152345A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011121001.3A CN112152345A (en) 2020-10-19 2020-10-19 Motor cooling system and motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011121001.3A CN112152345A (en) 2020-10-19 2020-10-19 Motor cooling system and motor

Publications (1)

Publication Number Publication Date
CN112152345A true CN112152345A (en) 2020-12-29

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ID=73953255

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011121001.3A Pending CN112152345A (en) 2020-10-19 2020-10-19 Motor cooling system and motor

Country Status (1)

Country Link
CN (1) CN112152345A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113172655A (en) * 2021-05-10 2021-07-27 福德机器人(成都)有限责任公司 Integrated joint device and seven-axis robot thereof
CN115173602A (en) * 2022-07-28 2022-10-11 小米汽车科技有限公司 Rotor subassembly, motor and vehicle

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113172655A (en) * 2021-05-10 2021-07-27 福德机器人(成都)有限责任公司 Integrated joint device and seven-axis robot thereof
CN115173602A (en) * 2022-07-28 2022-10-11 小米汽车科技有限公司 Rotor subassembly, motor and vehicle
CN115173602B (en) * 2022-07-28 2023-08-29 小米汽车科技有限公司 Rotor assembly, motor and vehicle

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