Oil-cooled stator with non-uniformly arranged oil guide grooves in circumferential direction

Abstract

An oil cooling stator with oil guide grooves unevenly distributed in the circumferential direction comprises a machine shell, a concave groove is formed in the bottom of the inner surface of the machine shell, an oil inlet is formed in the bottom of the concave groove, a stator iron core is arranged in the machine shell, an oil guide transverse groove and a plurality of oil guide longitudinal grooves are formed in the outer circumferential face of the stator iron core, and the concave groove is communicated with the oil guide transverse groove and corresponds to the oil guide transverse groove in position. The oil guide longitudinal grooves are communicated with the oil guide transverse grooves, the oil guide transverse grooves extend in the circumferential direction to form a ring shape, and the oil guide longitudinal grooves are formed in the circumferential direction at intervals, extend in the axial direction and are distributed on the two sides of the oil guide transverse grooves; the oil guide longitudinal grooves comprise wide grooves and narrow grooves which are distributed in the circumferential direction at intervals, the width of the wide grooves is larger than that of the narrow grooves, and the wide grooves are distributed in the 0-degree direction, the 90-degree direction and the 270-degree direction. According to the utility model, through the design of the oil guide longitudinal grooves, the oil guide transverse grooves, the wide grooves and the narrow grooves, the up-and-down oil injection condition of the motor is adjusted, so that the effect of uniformly cooling the stator core and the end winding is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical field especially relates to motor particularly oil cooling stator of circumferential uneven arrangement oil guide groove. BACKGROUND

[0002] With the continuous innovation of new energy market, the market demand for motor power density is continuously improved, and the size of motor is continuously reduced, so that there is great demand for a stator cooling scheme which meets the motor cooling effect and low performance loss. In the prior art, under the action of gravity in actual working condition, the motor cooling oil pressure is uneven up and down, which leads to uneven cooling effect of the stator core, end winding and motor. SUMMARY

[0003] The utility model discloses a kind of oil cooling stators of circumferential uneven arrangement oil guide groove, and the oil cooling stator of this circumferential uneven arrangement oil guide groove solves the technical problem of uneven cooling effect of the stator core, end winding and motor in the prior art.

[0004] The utility model discloses a kind of oil cooling stators of circumferential uneven arrangement oil guide groove, and the oil cooling stator of this circumferential uneven arrangement oil guide groove solves the technical problem of uneven cooling effect of the stator core, end winding and motor in the prior art.

[0005] The oil guide longitudinal groove includes wide groove and narrow groove distributed along the circumferential direction, and the width of the wide groove is greater than the width of the narrow groove.

[0006] The stator core end surface is provided with cover plate, and the cover plate is provided with a plurality of oil injection ports along the circumferential direction, wherein the part of oil injection port of the cover plate corresponds to the wide groove of the stator core one by one, and the cross-sectional area is less than the cross-sectional area of the wide groove.

[0007] Further, the bottom surface of the recessed groove is arc surface, and the arc angle of the arc surface is a, and 60°≤a≤120°.

[0008] Further, the groove depth of the oil guide transverse groove and the oil guide longitudinal groove is ≤1.5mm.

[0009] Further, the oil guide transverse groove is located in the middle of the stator core.

[0010] Further, the width of the wide groove is more than twice the width of the narrow groove.

[0011] Further, the top of the stator core is arranged at 0° orientation, the right part is arranged at 90° orientation, the bottom is arranged at 180° orientation, and the left part is arranged at 270° orientation, wherein the wide slots are distributed at 0°, 90° and 270° orientations; the oil injection ports at the top of the cover plate correspond to the wide slots at the 0° orientation of the stator core one by one, and the sectional area of the oil injection ports is smaller than that of the wide slots.

[0012] Further, the number of the wide slots at the 0° orientation is more than two, and the distribution angle range of the wide slots at the 0° orientation is b, 45°≤b≤60°.

[0013] Compared with the prior art, the utility model has the positive and obvious effect. The utility model discloses through the design of shallow slot (oil guide longitudinal groove, oil guide horizontal groove) and wide slot, narrow slot, adjusts the oil injection situation on the motor, thereby reaches the effect that the stator core and end winding are uniformly cooled, greatly reduces the loss of motor performance while satisfying the motor cooling demand. Meanwhile, through the variable cross section design of the top oil injection port on the cover plate, the top cooling oil spraying speed is improved. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the casing schematic diagram in the oil-cooled stator of the utility model of a circumferential non-uniform arrangement oil guide groove.

[0015] Figure 2 It is the distribution angle range schematic diagram of the wide slot in the oil-cooled stator of the utility model of a circumferential non-uniform arrangement oil guide groove.

[0016] Figure 3 It is the stator core schematic diagram in the oil-cooled stator of the utility model of a circumferential non-uniform arrangement oil guide groove.

[0017] Figure 4 It is the stator core mounting cover plate schematic diagram in the oil-cooled stator of the utility model of a circumferential non-uniform arrangement oil guide groove.

[0018] Figure 5 It is the oil injection port schematic diagram in the oil-cooled stator of the utility model of a circumferential non-uniform arrangement oil guide groove. DETAILED DESCRIPTION

[0019] The utility model is further described below in combination with embodiments, but the utility model is not limited to the embodiments, and any similar change using the utility model should be included in the protection scope of the utility model. The use of up, down, front, back, left, right, middle, inner and outer directions in the utility model is only for the convenience of clear description, and not for the limitation of the technical scheme of the utility model.

[0020] As Figures 1-5As shown, the oil cooling stator with circumferentially unevenly arranged oil guide grooves comprises a shell 1, a concave groove 4 is arranged on the bottom of the inner surface of the shell 1, an oil inlet 3 is arranged on the bottom of the concave groove 4, a stator core 2 is arranged in the shell 1, an oil guide horizontal groove 5 and a plurality of oil guide vertical grooves 6 are arranged on the outer circumferential surface of the stator core 2, the concave groove 4 is communicated with the oil guide horizontal groove 5 and the positions are corresponding, the oil guide vertical grooves 6 are communicated with the oil guide horizontal groove 5, the oil guide horizontal groove 5 extends along the circumferential direction to form a ring shape, the oil guide vertical grooves 6 are arranged at intervals along the circumferential direction and extend along the axial direction and are distributed on both sides of the oil guide horizontal groove 5, and the width of the concave groove 4 is greater than the width of the oil guide horizontal groove 5.

[0021] The oil guide vertical groove 6 comprises a wide groove 7 and a narrow groove 8 which are arranged at intervals along the circumferential direction, and the width of the wide groove 7 is greater than the width of the narrow groove 8.

[0022] The stator core 2 is provided with a cover plate 9, a plurality of oil injection ports 10 are arranged at intervals along the circumferential direction in the cover plate 9, and the part of the oil injection ports 10 of the cover plate 9 corresponds to the wide groove 7 of the stator core 2 one by one and the cross-sectional area is smaller than that of the wide groove 7.

[0023] Further, the bottom surface of the concave groove 4 is an arc surface, the arc angle of the arc surface is a, and 60°≤a≤120°.

[0024] Further, the groove depth of the oil guide horizontal groove 5 and the oil guide vertical groove 6 is ≤1.5mm.

[0025] Further, the oil guide horizontal groove 5 is located in the middle part of the stator core 2.

[0026] Further, the width of the wide groove 7 is more than twice the width of the narrow groove 8.

[0027] Further, the top of the stator core 2 is arranged as 0° orientation, the right part is arranged as 90° orientation, the bottom is arranged as 180° orientation, and the left part is arranged as 270° orientation, wherein the wide groove 7 is distributed at 0°, 90° and 270° orientations; the oil injection port 10 at the top of the cover plate 9 corresponds to the wide groove 7 at 0° orientation of the stator core 2 one by one and the cross-sectional area is smaller than that of the wide groove 7.

[0028] Further, the number of the wide groove 7 at 0° orientation is more than two, the distribution angle range of the wide groove 7 at 0° orientation is b, and 45°≤b≤60°.

[0029] Specifically, the shell 1, the stator core 2 and the like in the embodiment all adopt the known scheme in the prior art, and those skilled in the art are all familiar with it, which will not be described here.

[0030] The working principle of the embodiment is as follows:

[0031] The cooling oil enters from the oil inlet 3 of the casing 1, firstly fills the concave groove 4 of the inlet, then enters the oil guide transverse groove 5 of the stator core 2, enters the oil guide longitudinal groove 6 of the stator core 2 after passing through the oil guide transverse groove 5, and finally is sprayed from the oil outlet 10.

[0032] The angle a of the concave groove 4 is greater than or equal to 60 degrees, so as to reduce the pressure drop of the oil path, and the angle a is less than or equal to 120 degrees, so as to ensure a certain pressure, and make the oil amount of the top oil outlet meet the cooling requirement.

[0033] The distribution angle b of the wide groove 7 is greater than or equal to 45 degrees, so as to make the oil sprayed from the top meet the requirement of spraying and cooling the winding, and the distribution angle b is less than or equal to 60 degrees, based on the oil pressure, and too large distribution angle will reduce the oil pressure or uneven distribution.

[0034] The utility model discloses a shallow slot (oil guide longitudinal groove 6, oil guide transverse groove 5) and wide groove 7, narrow groove 8 are designed to adjust the oil spraying situation of the upper and lower motor, thereby achieving the effect that the stator core 2 and the end winding are uniformly cooled, the motor cooling requirement is met, and the loss of motor performance is greatly reduced. Meanwhile, through the variable cross-section design of the top oil outlet 10 on the cover plate 9, the spraying speed of the top cooling oil is improved.

Claims

1. An oil-cooled stator in which oil grooves are arranged circumferentially unevenly, characterized in that, The machine shell is internally provided with a concave groove, the bottom of the concave groove is provided with an oil inlet, the machine shell is provided with a stator core, the outer circumferential surface of the stator core is provided with an oil guide horizontal groove and a plurality of oil guide vertical grooves, the concave groove is in communication with the oil guide horizontal groove and is in position correspondence, the oil guide vertical grooves are in communication with the oil guide horizontal groove, the oil guide horizontal groove extends in a circular direction to form a ring, the oil guide vertical grooves are arranged in a circular direction and extend in an axial direction and are distributed on both sides of the oil guide horizontal groove, and the width of the concave groove is greater than the width of the oil guide horizontal groove. The oil guide vertical grooves include wide grooves and narrow grooves which are arranged in a circular direction, and the width of the wide grooves is greater than the width of the narrow grooves. The stator core is provided with a cover plate, the cover plate is provided with a plurality of oil injection ports which are arranged in a circular direction, and the cover plate is provided with a plurality of oil injection ports which are in one-to-one correspondence with the wide grooves of the stator core and have a cross-sectional area smaller than the cross-sectional area of the wide grooves.

2. The oil-cooled stator of claim 1, wherein: The bottom surface of the concave groove is an arc surface, the arc angle of the arc surface is a, and 60°≤a≤120°.

3. The oil-cooled stator of claim 1, wherein: The groove depth of the oil guide horizontal groove and the oil guide vertical groove is ≤1.5mm.

4. The oil-cooled stator of claim 1, wherein: The oil guide horizontal groove is located in the middle of the stator core.

5. The oil-cooled stator of claim 1, wherein: The width of the wide groove is more than twice the width of the narrow groove.

6. The oil-cooled stator of claim 1, wherein: The top of the stator core is provided with a 0° orientation, the right part is provided with a 90° orientation, the bottom is provided with a 180° orientation, and the left part is provided with a 270° orientation, and the wide grooves are distributed in the 0°, 90° and 270° orientations; the oil injection ports of the top of the cover plate are in one-to-one correspondence with the wide grooves of the 0° orientation of the stator core and have a cross-sectional area smaller than the cross-sectional area of the wide grooves.

7. The oil-cooled stator of claim 6, wherein: The number of the wide grooves of the 0° orientation is more than two, the distribution angle range of the wide grooves of the 0° orientation is b, and 45°≤b≤60°.

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