Liquid-cooled stator core and motor

Abstract

A liquid-cooled stator core relates to the technical field of electric motors. The outer wall of the stator core includes a plurality of straight grooves and a plurality of curved grooves. The groove depths of the straight grooves and the curved grooves are less than the wall thickness of the stator core. The plurality of straight grooves are parallel to the axis of the stator core and are spaced apart from each other. The plurality of curved grooves connect all the straight grooves end to end to form a cooling channel. The ends of the cooling channel are spaced apart from each other. The present invention also discloses a motor including a liquid-cooled stator core, which includes a casing, the stator core is fixedly disposed in the casing, and the inner wall of the casing seals the cooling channel. The liquid-cooled stator core and the motor of the present invention have ingenious stator core processing and simple manufacturing process. The cooling channel is disposed on the outer wall of the stator core, which improves the efficiency of heat dissipation and cooling.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a liquid-cooled stator core and a motor. Background Art

[0002] With the rapid development of motors, the requirements for motor heat dissipation are getting higher and higher. Traditional natural cooling and air cooling can no longer meet the heat dissipation requirements of motors, so more efficient liquid cooling is used instead. However, liquid cooling motors using liquid cooling have the following defects:

[0003] Liquid-cooled motors require a specialized liquid-cooling casing and liquid cooling channels in the casing, so the casing is usually larger in size. At the same time, because the liquid cooling channels in the casing are criss-crossed and complex, the design and manufacturing of the casing is more difficult, increasing the loss of manpower and material resources, and the price is expensive, which is not conducive to reducing the cost of the entire motor.

[0004] Therefore, developing a liquid-cooled motor with simpler processing technology and lower price is a technical problem that needs to be solved urgently by technical personnel in this field. Summary of the invention

[0005] In view of the defects existing in the prior art, the purpose of the present invention is to provide a liquid-cooled stator core and a motor, wherein the stator core is cleverly processed and has a simple manufacturing process; a cooling channel is arranged on the outer wall of the stator core, thereby improving the efficiency of heat dissipation and cooling.

[0006] The technical solution adopted is: a liquid-cooled stator core, characterized in that: the outer wall of the stator core comprises a plurality of straight grooves and a plurality of curved grooves, and the groove depths of the straight grooves and the curved grooves are less than the wall thickness of the stator core;

[0007] The plurality of straight grooves are parallel to the axis of the stator core and are spaced apart from each other; the plurality of curved grooves connect all the straight grooves end to end to form a cooling channel; the beginning and end ends of the cooling channel are spaced apart from each other.

[0008] On the basis of the above technical solution, the bottom surfaces of the straight groove and the curved groove are located on the same cylindrical surface, and the axis of the cylindrical surface is the axis of the stator core;

[0009] The stator core comprises a cylinder and two pressure plates respectively attached to the end surfaces of both sides of the cylinder. The pressure plate is in a flat ring shape, with an outer diameter equal to the outer diameter of the cylinder and an inner diameter smaller than the radius of the cylindrical surface.

[0010] On the basis of the above technical solution, the cylinder is formed by stacking a number of front punching sheets, a number of middle punching sheets and a number of rear punching sheets in sequence, and the front punching sheets, the middle punching sheets and the rear punching sheets are all circular thin steel plates, and a number of protruding sheets are processed in the outer circumference, and a circle of fan-shaped punching sheets are processed in the inner circumference;

[0011] After the front punch, the middle punch and the rear punch are stacked, the straight groove and the curved groove are formed between the protrusions in the outer circumferential direction, and the distance from the root of the fan-shaped punch located in the same radial direction to the outer edge of the protrusion is the wall thickness of the stator core.

[0012] On the basis of the above technical solution, the front end punching sheet is evenly distributed with N protrusions along the outer circle of the circular thin steel plate at equal angles, where N is an integer greater than or equal to 4;

[0013] The middle punching sheet is provided with 2N protrusions evenly distributed at equal angles along the outer circle of the circular thin steel plate;

[0014] The position of the protrusion of the rear punch is the same as that of the protrusion of the front punch, and an additional protrusion is provided in the middle of any two adjacent protrusions;

[0015] Any protrusion of the front end punching sheet, any protrusion of the middle punching sheet, and a protrusion added in the rear end punching sheet are superimposed and aligned.

[0016] On the basis of the above technical solution, the front punch, the middle punch and the rear punch are stacked, and a plurality of protruding pieces form a first partition, and the same number of second partitions and third partitions;

[0017] The length of the first partition is equal to the length of the cylinder, the lengths of the second partition and the third partition are equal and smaller than the length of the first partition, the second partition extends from one side end surface of the cylinder to the other side end surface, and the third partition is in the opposite direction to the second partition and is arranged in an alternating manner with each other.

[0018] The present invention also discloses a motor based on the above liquid-cooled stator core, the motor comprising a casing, the stator core being fixedly disposed in the casing, and the inner wall of the casing sealing the cooling channel;

[0019] At corresponding positions at both ends of the cooling channel, the casing is provided with holes for input and output of liquid cooling medium.

[0020] On the basis of the above technical solution, the bottom surfaces of the straight groove and the curved groove are located on the same cylindrical surface, and the axis of the cylindrical surface is the axis of the stator core;

[0021] The stator core comprises a cylinder and two pressure plates respectively attached to the end surfaces of both sides of the cylinder. The pressure plate is in a flat ring shape, with an outer diameter equal to the outer diameter of the cylinder and an inner diameter smaller than the radius of the cylindrical surface.

[0022] On the basis of the above technical solution, the cylinder is formed by stacking a number of front punching sheets, a number of middle punching sheets and a number of rear punching sheets in sequence, and the front punching sheets, the middle punching sheets and the rear punching sheets are all circular thin steel plates, and a number of protruding sheets are processed in the outer circumference, and a circle of fan-shaped punching sheets are processed in the inner circumference;

[0023] After the front punch, the middle punch and the rear punch are stacked, the straight groove and the curved groove are formed between the protrusions in the outer circumferential direction, and the distance from the root of the fan-shaped punch located in the same radial direction to the outer edge of the protrusion is the wall thickness of the stator core.

[0024] On the basis of the above technical solution, the front end punching sheet is evenly distributed with N protrusions along the outer circle of the circular thin steel plate at equal angles, where N is an integer greater than or equal to 4;

[0025] The middle punching sheet is provided with 2N protrusions evenly distributed at equal angles along the outer circle of the circular thin steel plate;

[0026] The position of the protrusion of the rear punch is the same as that of the protrusion of the front punch, and an additional protrusion is provided in the middle of any two adjacent protrusions;

[0027] Any protrusion of the front end punching sheet, any protrusion of the middle punching sheet, and a protrusion added in the rear end punching sheet are superimposed and aligned.

[0028] On the basis of the above technical solution, the front punch, the middle punch and the rear punch are stacked, and a plurality of protruding pieces form a first partition, and the same number of second partitions and third partitions;

[0029] The length of the first partition is equal to the length of the cylinder, the lengths of the second partition and the third partition are equal and smaller than the length of the first partition, the second partition extends from one side end surface of the cylinder to the other side end surface, and the third partition is in the opposite direction to the second partition and is arranged in an alternating manner with each other.

[0030] The beneficial effects of the present invention are:

[0031] 1. The outer wall of the liquid-cooled stator core of the present invention comprises a plurality of straight grooves and a plurality of curved grooves, which are connected to form a single cooling channel, and the cooling channel is sealed by the casing to form a cooling channel for the circulation of the cooling medium; the cooling channel is formed by stacking a plurality of front punching sheets, a plurality of middle punching sheets and a plurality of rear punching sheets, with ingenious design, simple structure, simple manufacturing process and low manufacturing cost; and the front punching sheets, the middle punching sheets and the rear punching sheets are all processed from circular thin steel plates of the same size, which is conducive to standardized mass production and accelerates production efficiency.

[0032] 2. The present invention includes a motor with a liquid-cooled stator core, which transfers the cooling channel existing in the casing in the prior art to the outer wall of the stator core; relatively speaking, the cooling channel is closer to the rotor that generates the heat source, thereby improving the efficiency of heat dissipation and cooling; at the same time, the stator core of the present invention is formed by stacking front-end punching sheets, middle punching sheets and rear-end punching sheets, and can adapt to different motor requirements by changing the number of stackings. It has flexible design, convenient adjustment, and is conducive to popularization. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a front view of the stator core according to an embodiment of the present invention.

[0034] Figure 2 Schematic diagram of the structure of the stator core according to an embodiment of the present invention.

[0035] Figure 3 for Figure 1 AA cross-sectional view (i.e. schematic diagram of front end punching).

[0036] Figure 4 for Figure 1 BB cross-sectional view (i.e. schematic diagram of the middle punch).

[0037] Figure 5 for Figure 1 CC cross-sectional view (i.e. schematic diagram of rear-end punching).

[0038] Figure 6 Schematic diagram of a motor cross section according to an embodiment of the present invention.

[0039] Figure numerals: 1-stator core, 2-casing, 10-cylinder, 11-pressure plate, 12-front punching sheet, 13-middle punching sheet, 14-rear punching sheet, 15-cooling channel, 16-protrusion, 31-first partition, 32-second partition, 33-third partition. DETAILED DESCRIPTION

[0040] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0041] like Figure 1 As shown, a liquid-cooled stator core, the outer wall of the stator core 1 includes a plurality of straight grooves and a plurality of curved grooves, and the groove depths of the straight grooves and the curved grooves are less than the wall thickness of the stator core 1.

[0042] The plurality of straight grooves are parallel to the axis of the stator core 1 and are spaced apart from each other. Preferably, the plurality of straight grooves are arranged at equal intervals. The plurality of curved grooves connect all the straight grooves end to end to form a cooling channel 15; the first and last ends of the cooling channel 15 are spaced apart from each other and are not connected.

[0043] In this embodiment, the bottom surfaces of the straight groove and the curved groove are located on the same cylindrical surface, and the axis of the cylindrical surface is the axis of the stator core 1. In other embodiments, the axis of the cylindrical surface can also be parallel to the axis of the stator core 1.

[0044] The stator core 1 comprises a cylinder 10 and two pressure plates 11, and the two pressure plates 11 are respectively attached to the two side end surfaces of the cylinder 10. The pressure plate 11 is in a flat ring shape, and its outer diameter is equal to the outer diameter of the cylinder 10. Specifically, the outer diameter of the pressure plate 11 is equal to the maximum outer diameter of the cylinder 10. The inner diameter of the pressure plate 11 is smaller than the radius of the cylindrical surface, and is used to seal the cooling channel 15. In this embodiment, the plurality of curved grooves are adjacent to the pressure plate 11.

[0045] like Figure 2 As shown, the cylinder 10 is formed by stacking a plurality of front punching sheets 12, a plurality of middle punching sheets 13 and a plurality of rear punching sheets 14 in sequence. The front punching sheets 12, the middle punching sheets 13 and the rear punching sheets 14 are all circular thin steel plates, and a plurality of protrusions 16 are processed in the outer circumference of the three, and a circle of fan-shaped punching sheets are processed in the inner circumference. Preferably, the front punching sheets 12, the middle punching sheets 13 and the rear punching sheets 14 are processed from circular thin steel plates of the same size, and the fan-shaped punching sheets of the inner circle of the three are of the same size.

[0046] After the front punching sheet 12, the middle punching sheet 13 and the rear punching sheet 14 are stacked, straight grooves and curved grooves are formed between the protruding pieces 16 in the outer circumferential direction, and a cooling channel 15 is formed. The distance from the root of the fan-shaped punching sheet to the outer edge of the protruding piece 16 in the same radial direction is the wall thickness of the stator core 1. The groove depths of the straight grooves and the curved grooves are both less than the wall thickness of the stator core 1; preferably, the groove depth is half of the wall thickness of the stator core 1.

[0047] like Figure 3 As shown, the front end punching piece 12 is provided with N protrusions 16 evenly distributed at equal angles along the outer circle of the circular thin steel plate, where N is an integer greater than or equal to 4.

[0048] like Figure 4 As shown, the middle punching piece 13 is provided with 2N protrusions 16 evenly distributed at equal angles along the outer circle of the circular thin steel plate.

[0049] like Figure 5 As shown, the position of the protrusion 16 of the rear end punch 14 is the same as the position of the protrusion 16 of the front end punch 12, and an additional protrusion 16 is provided in the middle of any two adjacent protrusions 16; that is, the rear end punch 14 is provided with an additional protrusion 16 on the basis of the front end punch 12, and the protrusion 16 is located in the middle of any two adjacent protrusions 16.

[0050] Any protrusion 16 of the front punch 12, any protrusion 16 of the middle punch 13, and an additional protrusion 16 of the rear punch 14 are superimposed and aligned, so as to form a Figure 2 The barrel 10 is shown.

[0051] In this embodiment, N is 8, that is, the front punch 12 has 8 protrusions 16 , the middle punch 13 has 16 protrusions 16 , and the rear punch 14 has 9 protrusions 16 .

[0052] like Figure 1 As shown, the front punch 12, the middle punch 13 and the rear punch 14 are stacked, and a plurality of protrusions 16 form a first partition 31, and the same number of second partitions 32 and third partitions 33. The first partition 31 separates the first and last ends of the cooling channel 15, specifically, separates the first and last straight grooves, so as to form a single but non-circulating cooling channel 15.

[0053] The length of the first partition 31 is equal to the length of the cylinder 10, the lengths of the second partition 32 and the third partition 33 are equal and smaller than the length of the first partition 31, the second partition 32 extends from one side end surface to the other side end surface of the cylinder 10, and the third partition 33, on the contrary, extends from the other side end surface of the cylinder 10. The third partition 33 is in the opposite direction to the second partition 32 and is arranged alternately.

[0054] like Figure 6 As shown, the motor includes a housing 2, a stator core 1 is fixedly disposed in the housing 2, and the inner wall of the housing 2 seals the cooling channel 15. Specifically, the inner diameter of the housing 2 is equal to the outer diameter of the stator core 1 (ie, the outer diameter of the cylinder 10 and the outer diameter of the pressure plate 11).

[0055] The housing 2 is provided with holes for inputting and outputting the liquid cooling medium at the corresponding positions at the head and tail ends of the cooling channel 15. When the motor is working, the liquid cooling medium directly flows in from the head end of the cooling channel 15, passes through a plurality of straight grooves and a plurality of curved grooves, and then flows out from the tail end of the cooling channel 15, thereby achieving the purpose of cooling.

[0056] The bottom surfaces of the straight grooves and the curved grooves are located on the same cylindrical surface, and the axis of the cylindrical surface is the axis of the stator core 1; the stator core 1 includes a cylinder 10 and two pressure plates 11 respectively attached to the end surfaces of both sides of the cylinder 10, and the pressure plate 11 is flat and annular, and its outer diameter is equal to the outer diameter of the cylinder 10, and its inner diameter is smaller than the radius of the cylindrical surface.

[0057] The cylinder 10 is formed by stacking a plurality of front punching sheets 12, a plurality of middle punching sheets 13 and a plurality of rear punching sheets 14 in sequence. The front punching sheets 12, the middle punching sheets 13 and the rear punching sheets 14 are all circular thin steel plates, and a plurality of protrusions 16 are processed in the outer circumferential direction, and a circle of fan-shaped punching sheets are processed in the inner circumferential direction. After the front punching sheets 12, the middle punching sheets 13 and the rear punching sheets 14 are stacked, straight grooves and curved grooves are formed between the protrusions 16 in the outer circumferential direction, and the distance from the root of the fan-shaped punching sheet located in the same radial direction to the outer edge of the protrusion 16 is the wall thickness of the stator core 1.

[0058] The front end punching piece 12 is provided with N protrusions 16 evenly distributed at equal angles along the outer circle of the circular thin steel plate, N is an integer and is greater than or equal to 4; the middle punching piece 13 is provided with 2N protrusions 16 evenly distributed at equal angles along the outer circle of the circular thin steel plate; the position of the protrusion 16 of the rear end punching piece 14 is the same as the position of the protrusion 16 of the front end punching piece 12, and an additional protrusion 16 is provided in the middle of any two adjacent protrusions 16; any protrusion 16 of the front end punching piece 12, any protrusion 16 of the middle punching piece 13 and an additional protrusion 16 in the rear end punching piece 14 are superimposed and aligned.

[0059] The front end punch 12, the middle punch 13 and the rear end punch 14 are stacked, and a plurality of protrusions 16 form a first partition 31, and the same number of second partitions 32 and third partitions 33; the length of the first partition 31 is equal to the length of the cylinder 10, the lengths of the second partition 32 and the third partition 33 are equal and smaller than the length of the first partition 31, the second partition 32 extends from one side end surface of the cylinder 10 to the other side end surface, and the third partition 33 is in the opposite direction to the second partition 32 and is staggered and spaced apart from each other.

[0060] Preferably, the front punching sheet 12, the middle punching sheet 13 and the rear punching sheet 14 are all made of 304 stainless steel plates; the front punching sheet 12, the middle punching sheet 13 and the rear punching sheet 14 are all processed by automatic CNC lathes. A plurality of front punching sheets 12, a plurality of middle punching sheets 13 and a plurality of rear punching sheets 14 are stacked together by welding.

[0061] The present invention is not limited to the above-mentioned embodiments. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention. The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

Claims

1. A liquid-cooled stator core, characterized in that: The outer wall of the stator core (1) comprises a plurality of straight grooves and a plurality of curved grooves, and the groove depths of the straight grooves and the curved grooves are less than the wall thickness of the stator core (1); The plurality of straight grooves are parallel to the axis of the stator core (1) and are arranged at equal intervals; the plurality of curved grooves connect all the straight grooves end to end to form a cooling channel (15); the first and last ends of the cooling channel (15) are separated from each other; The bottom surfaces of the straight grooves and the curved grooves are located on the same cylindrical surface, and the axis of the cylindrical surface is the axis of the stator core (1); the stator core (1) comprises a cylinder (10) and two pressure plates (11) respectively attached to the end surfaces of both sides of the cylinder (10), the pressure plates (11) are flat ring-shaped, the outer diameter of which is equal to the outer diameter of the cylinder (10), and the inner diameter of which is smaller than the radius of the cylindrical surface; the plurality of curved grooves are adjacent to the pressure plates (11); The cylinder (10) is formed by laminating a plurality of front punching sheets (12), a plurality of middle punching sheets (13) and a plurality of rear punching sheets (14) in sequence, wherein the front punching sheets (12), the middle punching sheets (13) and the rear punching sheets (14) are all annular thin steel plates, and a plurality of protrusions (16) are processed in the outer circumferential direction thereof, and a circle of fan-shaped punching sheets are processed in the inner circumferential direction thereof; after the front punching sheets (12), the middle punching sheets (13) and the rear punching sheets (14) are laminated, the straight grooves and the curved grooves are formed between the protrusions (16) in the outer circumferential direction, and the distance from the root of the fan-shaped punching sheets located in the same radial direction to the outer edge of the protrusions (16) is the wall thickness of the stator core (1); The front punch (12) is provided with N protrusions (16) uniformly distributed at equal angles along the outer circle of the circular thin steel plate, where N is an integer greater than or equal to 4; the middle punch (13) is provided with 2N protrusions (16) uniformly distributed at equal angles along the outer circle of the circular thin steel plate; the position of the protrusion (16) of the rear punch (14) is the same as the position of the protrusion (16) of the front punch (12), and an additional protrusion (16) is provided in the middle of any two adjacent protrusions (16); any protrusion (16) of the front punch (12), any protrusion (16) of the middle punch (13), and a protrusion (16) added to the rear punch (14) are superimposed and aligned; The front punch (12), the middle punch (13) and the rear punch (14) are stacked, and a plurality of protrusions (16) form a first partition (31), and an equal number of second partitions (32) and third partitions (33); the length of the first partition (31) is equal to the length of the cylinder (10), the lengths of the second partition (32) and the third partition (33) are equal and smaller than the length of the first partition (31), the second partition (32) extends from one side end surface of the cylinder (10) to the other side end surface, and the third partition (33) is in the opposite direction to the second partition (32) and is arranged in a staggered manner.

2. A motor based on the liquid-cooled stator core according to claim 1, characterized in that: The motor comprises a casing (2), the stator core (1) being fixedly arranged in the casing (2), and the inner wall of the casing (2) sealing the cooling channel (15); At corresponding positions at both ends of the cooling channel (15), the casing (2) is provided with holes for input and output of liquid cooling medium.

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