CN112671124B - Motor inner stator and motor - Google Patents
Motor inner stator and motor Download PDFInfo
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- CN112671124B CN112671124B CN202011570477.5A CN202011570477A CN112671124B CN 112671124 B CN112671124 B CN 112671124B CN 202011570477 A CN202011570477 A CN 202011570477A CN 112671124 B CN112671124 B CN 112671124B
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- inner stator
- end cover
- sealing sheath
- motor
- stator
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Abstract
The invention provides a motor inner stator which comprises a stator assembly, an inner stator support, an inner stator end cover and a sealing sheath, wherein the inner stator support is connected with a motor rotating shaft through a bearing. The inner stator end cover comprises a front end cover and a rear end cover, and an annular groove and a lubricating oil hole are formed in the surface of the inner stator end cover and are respectively fixed at two ends of the inner stator support. The sealing sheath is a thin-wall cylinder with a stepped structure in the middle, and two ends of the sealing sheath are respectively connected with the front end cover and the rear end cover through annular grooves. The stator assembly is arranged in the sealing sheath, a gap is reserved between the stator assembly and the inner stator end cover, and the stator assembly is arranged on the inner stator support. According to the invention, the stepped structure is additionally arranged in the middle of the sealing sheath, so that the mechanical strength of the sealing sheath is enhanced, and the strain of the middle position of the sheath is reduced, therefore, the sealing sheath can bear larger oil pressure than a common structure, the flow rate of cooling oil can be increased, the heat dissipation capability of the motor is improved, the structure is compact, and the reliability is strong.
Description
Technical Field
The invention relates to the field of motors, in particular to a motor inner stator and a motor.
Background
The heat dissipation capability is an important factor for restricting the further improvement of the motor performance, such as the power density, the torque density, the reliability and the like of the motor. In the design process of the motor, the determination of key parameters such as motor split ratio, winding current and the like depends on the heat load size and the heat dissipation capacity of the motor to a certain extent. The heat dissipation capacity of the motor is related to the cooling mode and the flow rate of the cooling medium, and the faster the flow rate is, the more timely the heat generated inside the motor can be carried away, so that the temperature rise of the motor is reduced. And the too fast velocity of flow of cooling medium can bring the oil pressure increase on the sealed sheath, can cause the deformation and the unstability of sealed sheath structure under some circumstances, leads to the trouble such as oil leak to take place.
The middle part of a sealing sheath structure in the existing motor inner stator is a thin-wall cylinder with uniform thickness, the pressure born by the sealing sheath structure is limited, and when the oil pressure of cooling oil is too large, buckling instability of the sealing sheath can be caused, so that internal faults occur in the running process of a motor. And the limit of the strength of the sealing sheath on the cooling oil pressure can limit the heat dissipation capacity of the motor, so that the performance of the motor is limited.
Disclosure of Invention
In order to solve the problems, the motor inner stator comprises a stator assembly 1, an inner stator support 2, an inner stator end cover and a sealing sheath 4, wherein the inner stator support 2 is connected with a motor rotating shaft 5 through a bearing. The inner stator end cover comprises a front end cover 32 and a rear end cover 31, and an annular groove and a lubricating oil hole are formed in the surface of the inner stator end cover and are respectively fixed at two ends of the inner stator support 2. The sealing sheath 4 is a thin-walled cylinder with a stepped structure in the middle, and two ends of the sealing sheath are respectively connected with the front end cover 32 and the rear end cover 31 through annular grooves. The stepped structure, i.e. the sealing boot 4 in axial direction, consists of two thin-walled cylinders of different radii. The stator assembly 1 is arranged in the sealing sheath 4, a gap is reserved between the stator assembly and the inner stator end cover, and the stator assembly is arranged on the inner stator support 2.
According to an embodiment of the present invention, the stepped structure of the sealing sheath 4 is equidistant from the front end cap 32 and the rear end cap 31.
According to one embodiment of the invention, the stepped structure of the sealing boot 4 is provided on both the inner and outer surfaces of the sealing boot 4.
According to one embodiment of the invention, the ratio of the step height of the stepped structure of the sealing boot 4 to the wall thickness of the sealing boot 4 is between 0.2 and 2.
According to one embodiment of the invention, the stator assembly 1 has a stepped structure corresponding to the stepped structure of the sealing sheath 4.
According to another aspect of the invention, an electric machine comprises the electric machine inner stator.
According to an embodiment of the invention, the motor further comprises a motor rotating shaft 5 and a motor outer rotor, the motor outer rotor comprises an outer rotor casing 61 and a rotor assembly 62, the outer rotor casing 61 is fixed on the motor rotating shaft 5, and the inner surface of the outer rotor casing is connected with the rotor assembly 62. The rotor assembly 62 and the stator assembly 1 are correspondingly arranged.
According to one embodiment of the invention, the rotor assembly 62 has a stepped configuration corresponding to that of the sealing sheath 4.
According to another aspect of the invention, an electric machine includes the sealing boot of any of the above embodiments, and the electric machine employs an outer stator inner rotor structure.
According to the invention, the stepped structure is additionally arranged in the middle of the sealing sheath, and because two ends of the sealing sheath are fixed, the middle position has larger deformation due to the extrusion of the cooling liquid, and the stepped structure strengthens the mechanical strength of the sealing sheath under the condition that the gap between the stator and the rotor is not enlarged and the flow of the cooling liquid is not influenced, so that the strain of the middle position of the sheath is reduced, and therefore, the sealing sheath can bear larger oil pressure than a common structure, the flow velocity of the cooling oil can be increased, the heat dissipation capability of the motor is improved, the structure is compact, and the reliability is strong.
Drawings
FIG. 1 is a schematic view of an electric machine inner stator;
fig. 2 is a schematic view of the motor.
Detailed Description
The preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals refer to like elements and techniques of the present invention so that advantages and features of the present invention may be more readily understood when implemented in a suitable environment. The following description is an embodiment of the present invention, and other embodiments related to the claims that are not explicitly described also fall within the scope of the claims.
Fig. 1 is a schematic view of an electric machine inner stator.
As shown in fig. 1, the motor inner stator comprises a stator assembly 1, an inner stator support 2, an inner stator end cover and a sealing sheath 4, wherein the inner stator support 2 is connected with a motor rotating shaft 5 through a bearing. The inner stator end cover comprises a front end cover 32 and a rear end cover 31, and an annular groove and a lubricating oil hole are formed in the surface of the inner stator end cover and are respectively fixed at two ends of the inner stator support 2. The sealing sheath 4 is a thin-walled cylinder with a stepped structure in the middle, and two ends of the sealing sheath are respectively connected with the front end cover 32 and the rear end cover 31 through annular grooves. The stepped structure, i.e. the sealing boot 4 in axial direction, consists of two thin-walled cylinders of different radii. The stator assembly 1 is arranged in the sealing sheath 4, a gap is reserved between the stator assembly and the inner stator end cover, and the stator assembly is arranged on the inner stator support 2.
The stator assembly 1 is a stator which is used for being matched with a rotor to convert mechanical energy of a prime motor into electric energy to be output by utilizing an electromagnetic induction principle that a wire cuts a magnetic line to induce electric potential. The sealing sheath 4 can be used for isolating cooling oil or other cooling liquid. Two ball bearings are sleeved on the motor rotating shaft 5, the distance between the two bearings is kept through a cylindrical bearing positioning sleeve, then the bearings are connected with the stator assembly 1, screw holes are formed in the stator support, the front end cover 31 and the rear end cover 31 are fixed on the stator assembly 1 through screws, and two ends of the sealing sheath 4 are clamped in circular grooves carved on the front end cover 31 and the rear end cover 31 to be fixed. Typically the step-down direction is the same as the coolant flow direction, i.e. the coolant flows from left to right as shown.
The sealing sheath 4 is clamped and installed through the front end cover 31 and the rear end cover 31 of the rotor, the stator assembly 1 is sealed together with the front end cover and the rear end cover of the stator, and after cooling liquid is introduced, the cooling liquid can fully contact with the stator core and the winding, so that heat generated by iron loss and copper loss is effectively taken away.
According to the invention, the stepped structure is additionally arranged in the middle of the sealing sheath, and two ends of the sealing sheath are fixed, so that the middle position has larger deformation due to the extrusion of cooling liquid, and the stepped structure strengthens the mechanical strength of the sealing sheath under the condition that the gap between the stator and the rotor is not enlarged and the flowing of the cooling liquid is not influenced, thereby reducing the strain of the middle position of the sheath, so that the sealing sheath can bear larger oil pressure than a common structure, the flow rate of the cooling oil can be increased, the heat dissipation capability of the motor can be improved, the structure is compact, and the reliability is strong.
According to one embodiment of the present invention, the stepped structure of the sealing boot 4 is equidistant from the front end cap 32 and the rear end cap 31. Because the two ends of the sealing sheath 4 are fixed, the middle position has larger deformation due to the extrusion of cooling liquid, and the instability risk exists after the oil pressure exceeds the allowable stress of the material, so that the stability can be improved to the maximum extent by arranging a step at the center.
As shown in fig. 1, the stepped structure of the sealing sheath 4 is disposed on the inner and outer surfaces of the sealing sheath 4, and the stepped directions are matched as shown in the figure, i.e., there are steps inside and outside, so as to save space under the condition of ensuring mechanical strength and facilitate processing.
According to one embodiment of the invention, the ratio of the step height of the stepped structure of the sealing boot 4 to the wall thickness of the sealing boot 4 is between 0.2 and 2.
The ratio of the height of the step to the wall thickness of the sealing sheath 4 is 0.2-2, so that the cooling liquid can not generate large turbulence at the step flowing position to influence the cooling effect. The wall thickness and the step height cannot be set as desired due to the limitation of the width of the air gap, and the ratio of the step height to the wall thickness of the sealing sheath 4 is 0.2-2 to ensure that the step structure does not affect the output of the motor sufficiently and improve the mechanical strength at the same time in order to increase the wall thickness or the step height and influence the output capability of the motor irrevocably.
According to one embodiment of the invention, the stator assembly 1 has a stepped structure corresponding to the stepped structure of the sealing sheath 4. I.e. the shape of the stator assembly 1 fits the stepped structure, leaving a gap between them that is smoother for the flow of the cooling liquid.
Fig. 2 is a schematic view of a motor.
As shown in fig. 2, an electric machine includes the electric machine inner stator described in any one of the above.
As shown in fig. 2, the motor further includes a motor shaft 5 and a motor outer rotor, the motor outer rotor includes an outer rotor casing 61 and a rotor assembly 62, the outer rotor casing 61 is fixed on the motor shaft 5, and the inner surface is connected with the rotor assembly 62. The rotor assembly 62 and the stator assembly 1 are correspondingly arranged. According to one embodiment of the invention, the rotor assembly 62 has a stepped configuration corresponding to that of the sealing boot 4.
According to another aspect of the invention, an electric machine includes the sealing boot of any of the above embodiments, and the electric machine employs an outer stator inner rotor structure. Similarly, the same sealing sheath may be employed on the outer stator inner rotor structure.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim.
Claims (8)
1. An inner stator of a motor comprises a stator assembly (1), an inner stator support (2), an inner stator end cover and a sealing sheath (4),
the inner stator support (2) is connected with a motor rotating shaft (5) through a bearing;
the inner stator end cover comprises a front end cover (32) and a rear end cover (31) which are respectively fixed at two ends of the inner stator support (2);
the surface of the inner stator end cover is provided with an annular groove and a lubricating oil hole;
the sealing sheath (4) is a thin-wall cylinder with a step structure in the middle, and two ends of the sealing sheath are respectively connected with the front end cover (32) and the rear end cover (31) through annular grooves;
the sealing sheath (4) is composed of two thin-wall cylinders with different radiuses along the axial direction;
the stator assembly (1) is arranged on the inner stator support (2), is positioned in the sealing sheath (4) and has a gap with the inner stator end cover;
the ratio of the step height of the step structure of the sealing sheath (4) to the wall thickness of the sealing sheath (4) is between 0.2 and 2.
2. The motor inner stator according to claim 1, wherein the stepped structure of the sealing sheath (4) is equidistant from the front end cap (32) and the rear end cap (31).
3. An electric machine inner stator according to claim 1, the stepped structure of the sealing sheath (4) being provided at both the inner and outer surfaces of the sealing sheath (4).
4. An electric machine inner stator according to claim 1, the stator assembly (1) having a stepped structure corresponding to the stepped structure of the sealing sheath (4).
5. An electric machine comprising an electric machine inner stator as claimed in any one of claims 1-4.
6. The electric machine according to claim 5, further comprising a motor shaft (5) and a motor outer rotor comprising an outer rotor housing (61), a rotor assembly (62),
the outer rotor casing (61) is fixed on the motor rotating shaft (5), and the inner surface of the outer rotor casing is connected with a rotor assembly (62);
the rotor assembly (62) and the stator assembly (1) are arranged correspondingly.
7. The electric machine according to claim 6, the rotor assembly (62) having a stepped structure corresponding to the stepped structure of the sealing boot (4).
8. An electric machine comprising the sealed sheath of any of claims 1-4, and employing an outer stator inner rotor configuration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011570477.5A CN112671124B (en) | 2020-12-26 | 2020-12-26 | Motor inner stator and motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011570477.5A CN112671124B (en) | 2020-12-26 | 2020-12-26 | Motor inner stator and motor |
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| Publication Number | Publication Date |
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| CN112671124A CN112671124A (en) | 2021-04-16 |
| CN112671124B true CN112671124B (en) | 2023-01-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011570477.5A Active CN112671124B (en) | 2020-12-26 | 2020-12-26 | Motor inner stator and motor |
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| CN (1) | CN112671124B (en) |
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| US3013500A (en) * | 1958-07-10 | 1961-12-19 | Westinghouse Electric Corp | Sealed dynamoelectric machine |
| EP1898054B1 (en) * | 2006-08-25 | 2018-05-30 | Ansaldo Energia IP UK Limited | Gas turbine |
| CN101662191A (en) * | 2009-09-25 | 2010-03-03 | 梁富泉 | Inner cooling and inner lubricating type double external rotor motor |
| CN102761195A (en) * | 2012-03-15 | 2012-10-31 | 哈尔滨电机厂有限责任公司 | Structure for inhibiting torsional vibration of motor rotor by damping |
| CN104410182B (en) * | 2014-10-13 | 2017-05-24 | 三禾电器(福建)有限公司 | Electric pump |
| CN206386282U (en) * | 2016-12-29 | 2017-08-08 | 山东颜山泵业有限公司 | High temperature No leakage heat-insulating and sealing mechanism |
| CN207559779U (en) * | 2017-08-31 | 2018-06-29 | 株洲联诚集团控股股份有限公司 | A kind of driving motor of moving vehicle set transformer cooling blower |
| CN108625917A (en) * | 2018-06-28 | 2018-10-09 | 西安交通大学 | A kind of supercritical carbon dioxide Brayton cycle power part coolant seal insulation system |
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| RU2004134011A (en) * | 2004-11-22 | 2006-05-10 | Зинаида Моисеевна Кучинска (RU) | HORIZONTAL CAPSULE HYDROGENERATOR AIR COOLING SYSTEM |
| CN201038850Y (en) * | 2007-04-17 | 2008-03-19 | 陈志瑞 | Torque motor with limited rotation angle |
| CN101087082A (en) * | 2007-05-25 | 2007-12-12 | 奇瑞汽车有限公司 | A cooling water cover of mixing drive motorcar electromotor and its making method |
| CN102723828A (en) * | 2012-06-29 | 2012-10-10 | 乐山东风汽车电器有限公司 | Portable permanent-magnet direct-drive double-stator wind power generator |
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| CN112671124A (en) | 2021-04-16 |
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