Efficient cooling high-speed permanent magnet synchronous motor

Abstract

The invention relates to the technical field of motors, and provides an efficient cooling high-speed permanent magnet synchronous motor which comprises a motor shell, an air inlet hole is formed in the outer surface of the motor shell, a supporting ring is detachably connected to the interior of the motor shell, a stator winding is fixedly connected to the inner side of the supporting ring, and a rotor is rotatably connected to the inner side of the stator winding. A rotating shaft is fixedly connected to the middle of the rotor, blades are fixedly connected to the outer surface of the rotating shaft, a cavity formed by the stator winding, the rotor, the motor shell and the end cover is an air passing channel, an air outlet pipe is fixedly connected to the outer surface of the motor shell, and an air outlet opening is formed in the surface of the stator winding. A cavity formed by the inner side position, corresponding to the supporting ring, of the stator winding, the supporting ring and the motor shell is an air outlet cavity. According to the technical scheme, the problems that an existing high-speed permanent magnet synchronous motor winding is high in accumulated heat, the effective power capacity of the motor is reduced, the manufacturing cost of a motor with the same power level is high, and manufacturing materials are wasted to a certain extent are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and more specifically, to a high-efficiency cooling high-speed permanent magnet synchronous motor. Background Art

[0002] The permanent magnet synchronous motor uses permanent magnets to provide excitation, making the motor structure relatively simple, reducing processing and assembly costs, and eliminating the slip rings and brushes that are prone to problems, improving the reliability of motor operation; also, because there is no need for excitation current and no excitation loss, the efficiency and power density of the motor are improved; After retrieval, a high-speed permanent magnet synchronous motor with a stator main insulation water channel cooling system, whose authorized announcement number is CN110247489B, includes a stator frame and a stator core and a rotor core arranged in the stator frame. The stator core is arranged in the stator frame. The rotor core is arranged on the inner wall of the stator core and there is a gap between the rotor core and the stator core. The stator core is provided with a stator winding. The stator winding is wrapped with a main insulation, and the main insulation is externally wrapped with a stator main insulation water channel; the structure of the present invention is simple and the cooling effect is good, solving the problem of poor heat dissipation conditions of high-speed permanent magnet synchronous motors, while reducing the temperature rise of the structural parts of high-speed permanent magnet synchronous motors and improving the operation reliability of high-speed permanent magnet synchronous motors; However, the existing high-speed permanent magnet synchronous motor mentioned above has a high heat accumulation in the winding, reducing the effective power capacity of the motor, a high manufacturing cost for motors of the same power level, and a certain waste of manufacturing materials. For this reason, we propose a high-efficiency cooling high-speed permanent magnet synchronous motor. Summary of the Invention

[0003] The present invention proposes a high-efficiency cooling high-speed permanent magnet synchronous motor, solving the problems that the existing high-speed permanent magnet synchronous motor mentioned in the background art has a high heat accumulation in the winding, reducing the effective power capacity of the motor, a high manufacturing cost for motors of the same power level, and a certain waste of manufacturing materials.

[0004] The technical solution of the present invention is as follows: A high-efficiency cooling high-speed permanent magnet synchronous motor includes a motor housing. An air inlet hole is provided on the outer surface of the motor housing. A support ring is detachably connected inside the motor housing. A stator winding is fixedly connected to the inner side of the support ring. A rotor is rotatably connected to the inner side of the stator winding. A rotating shaft is fixedly connected to the middle of the rotor. Blades are fixedly connected to the outer surface of the rotating shaft. The cavity formed by the stator winding, the rotor, the motor housing and the end cover is an air passing channel. An air outlet pipe is fixedly connected to the outer surface of the motor housing. An air outlet opening is provided on the surface of the stator winding. The cavity formed by the stator winding corresponding to the inner side of the support ring, the support ring and the motor housing is an air outlet cavity.

[0005] As a further technical solution of the present invention, end covers are fixedly connected to both ends of the motor housing. The number of the blades is two groups and they are symmetrically distributed. The air inlet hole is communicated with the air passing channel. The gap formed between the rotor and the stator winding is communicated with both the air passing channel and the air outlet opening. The air outlet cavity is communicated with both the air outlet opening and the air outlet pipe.

[0006] As a further technical solution of the present invention, the number of the support rings is two groups and they are symmetrically distributed. The air outlet cavity and the air passing channel are separated by the two support rings. The number of the air outlet openings is several groups and they are distributed in a circular array. One end of the rotating shaft extends outwards from the center of the end cover. Cold air enters the air passing channel from the air inlet hole, enters the air outlet opening through the cavity formed between the rotor and the stator winding, enters the interior of the air outlet cavity through the air outlet opening, and finally discharges hot air through the air outlet pipe. The flow of the air flow is realized by the rotation of the blades.

[0007] As a further technical solution of the present invention, a dust removal structure is arranged on the outer surface of the motor housing near the air inlet hole. The dust removal structure includes a hollow column fixedly connected to the outer surface of the motor housing near the air inlet hole. A sleeve column is movably sleeved on the outer surface of the hollow column. A sleeve cover is fixedly connected to the outer surface of the sleeve column. A return spring is connected between the sleeve cover and the motor housing. A filter screen is detachably connected to the upper end surface of the sleeve column. Through holes are formed on the outer surface of the hollow column. An elastic ball is fixedly connected to the inner wall surface of the sleeve column.

[0008] As a further technical solution of the present invention, an adjusting structure is arranged on the inner wall surface of the motor housing near the air inlet hole. The adjusting structure includes a limiting plate fixedly connected to the inner wall surface of the motor housing near the support ring. A movable plate is slidably connected between the limiting plate and the motor housing. A protruding plate is fixedly connected to one end surface of the movable plate. A through column penetrates through the outer surface of the protruding plate. An expansion spring is connected between the protruding plate and the support ring. A limiting head is fixedly connected to one end of the through column.

[0009] As a further technical solution of the present invention, the inner diameter of the hollow column is larger than the diameter of the air inlet hole. The sleeve column slides up and down along the hollow column. The sleeve cover is a hollow cylindrical structure with a concave inner bottom end. The number of the through holes is several groups and they are vertically and equally spaced.

[0010] As a further technical solution of the present invention, the inner diameter of the sleeve column matches the outer diameter of the hollow column. The return spring is vertically arranged, and the elastic ends of the return spring are respectively fixed to the inner wall of the sleeve cover and the surface of the motor housing. The elastic ball is a hemispherical structure with elasticity.

[0011] As a further technical solution of the present invention, the diameter of the elastic ball is smaller than the diameter of the through hole, and the position of the elastic ball corresponds to the position of the through hole. Vibration is generated by the relative movement between the elastic ball and the hollow column to shake off the dust on the surface of the filter screen, and the filter screen together with the sleeve column moves along the axial length direction of the hollow column by adjusting the magnitude of the wind force.

[0012] As a further technical solution of the present invention, the movable plate slides between the limiting plate and the motor housing, the protruding plate slides along the length direction of the through column, one end of the through column is fixedly connected to the support ring, the expansion spring is a spring that expands when heated and contracts when pre-cooled, the expansion spring is sleeved on the outer surface of the through column, and the inner diameter of the expansion spring is larger than the diameter of the through column.

[0013] As a further technical solution of the present invention, the elastic ends of the expansion spring are respectively fixedly connected to the protruding plate and the support ring, the limiting head is used to limit the maximum distance of the inward movement of the protruding plate, the movable plate passes through the support ring, and the movable plate is slidably connected to the support ring, the motor housing and the limiting plate.

[0014] The working principle and beneficial effects of the present invention are as follows: Through the unique design of the heat dissipation channel, the present invention can suck the external cooling air volume into the interior of the motor during the operation of the motor, effectively take away the heat of the winding, realize the efficient heat dissipation of the motor, design the ventilation duct by segmenting the stator core, the cooling air passes through the duct to dissipate the temperature of the heat dissipation winding, and at the same time reduce the manufacturing cost and save manufacturing materials for motors of the same power level. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0016] Figure 1 is a schematic diagram of the motor structure of the present invention; Figure 2 is for the present invention Figure 1 partial structure schematic diagram; Figure 3 is for the present invention Figure 2 partial structure schematic diagram cut from another perspective; Figure 4 is for the present invention Figure 1 partial structure schematic diagram; Figure 5 is for the present invention Figure 2 disassembled partial structure schematic diagram; Figure 6 is a partial structure schematic diagram of the present invention cut at the sleeve cover; Figure 7 is a partial structure schematic diagram of the present invention cut at the sleeve column; Figure 8 It is a schematic diagram of a partial structure cut near the adjustment structure in the present invention; Figure 9 In the present invention Figure 8 is an enlarged view of a partial structure.

[0017] In the figure: 1, motor housing; 2, air inlet hole; 3, dust removal structure; 31, hollow column; 32, sleeve column; 33, sleeve cover; 34, return spring; 35, filter screen; 36, through hole; 37, elastic ball; 4, adjustment structure; 41, movable plate; 42, limiting plate; 43, protruding plate; 44, through column; 45, expansion spring; 46, limiting head; 5, rotor; 6, rotating shaft; 7, blade; 8, stator winding; 9, support ring; 10, end cover; 11, air passage; 12, air outlet pipe; 13, air outlet opening; 14, air outlet cavity. Specific embodiments

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present invention. Embodiment 1

[0019] As Figures 1 to 5 shown, this embodiment proposes a high-efficiency cooling high-speed permanent magnet synchronous motor, including a motor housing 1. An air inlet hole 2 is provided on the outer surface of the motor housing 1. A support ring 9 is detachably connected inside the motor housing 1. A stator winding 8 is fixedly connected to the inner side of the support ring 9. A rotor 5 is rotatably connected to the inner side of the stator winding 8. A rotating shaft 6 is fixedly connected to the middle of the rotor 5. Blades 7 are fixedly connected to the outer surface of the rotating shaft 6. The cavity formed by the stator winding 8, the rotor 5, the motor housing 1 and the end cover 10 is an air passage 11. An air outlet pipe 12 is fixedly connected to the outer surface of the motor housing 1. An air outlet opening 13 is provided on the surface of the stator winding 8. The cavity formed by the stator winding 8 corresponding to the inner side of the support ring 9, the support ring 9 and the motor housing 1 is an air outlet cavity 14.

[0020] End covers 10 are fixedly connected to both ends of the motor housing 1. The number of blades 7 is two groups and they are symmetrically distributed. The air inlet hole 2 is communicated with the air passage 11. The gap formed between the rotor 5 and the stator winding 8 is communicated with both the air passage 11 and the air outlet opening 13. The air outlet cavity 14 is communicated with both the air outlet opening 13 and the air outlet pipe 12.

[0021] The number of the support rings 9 is two groups and they are symmetrically distributed. The air outlet cavity 14 and the air passing channel 11 are separated by the two groups of support rings 9. The number of the air outlet openings 13 is several groups and they are distributed in an annular array. One end of the rotating shaft 6 extends outwards from the center of the end cover 10. The cold air enters the air passing channel 11 from the air inlet hole 2, enters the air outlet opening 13 through the cavity formed by the rotor 5 and the stator winding 8, enters the interior of the air outlet cavity 14 through the air outlet opening 13, and finally discharges the hot air through the air outlet pipe 12. The flow of the air flow is realized by the rotation of the blades 7.

[0022] In this embodiment, through the design of a unique heat dissipation channel, the external cooling air volume can be sucked into the interior of the motor during the operation of the motor, effectively taking away the heat of the winding, realizing the efficient heat dissipation of the motor. By segmentally designing the ventilation ducts in the stator core, the cooling air passes through the ducts to dissipate the temperature of the heat dissipation winding. At the same time, the manufacturing cost of the motor with the same power rating is reduced, and the manufacturing materials are saved. Embodiment 2

[0023] As Figures 6 to 7 shown, on the basis of Embodiment 1, a dust removal structure 3 is further provided on the outer surface of the motor housing 1 near the air inlet hole 2. The dust removal structure 3 includes a hollow column 31 fixedly connected to the outer surface of the motor housing 1 near the air inlet hole 2. A sleeve column 32 is movably sleeved on the outer surface of the hollow column 31. A sleeve cover 33 is fixedly connected to the outer surface of the sleeve column 32. A return spring 34 is connected between the sleeve cover 33 and the motor housing 1. A filter screen 35 is detachably connected to the upper end surface of the sleeve column 32. Through holes 36 are formed on the outer surface of the hollow column 31. An elastic ball 37 is fixedly connected to the inner wall surface of the sleeve column 32.

[0024] The inner diameter of the hollow column 31 is larger than the diameter of the air inlet hole 2. The sleeve column 32 slides up and down along the hollow column 31. The sleeve cover 33 is a hollow cylindrical structure with a concave inner lower end. The number of the through holes 36 is several groups and they are vertically equally spaced; the inner diameter of the sleeve column 32 matches the outer diameter of the hollow column 31. The return spring 34 is vertically arranged, and the elastic ends of the return spring 34 are respectively fixed to the inner wall of the sleeve cover 33 and the surface of the motor housing 1. The elastic ball 37 is a hemispherical structure with elasticity.

[0025] The diameter of the elastic ball 37 is smaller than the diameter of the through hole 36. The position of the elastic ball 37 corresponds to the position of the through hole 36. The dust on the surface of the filter screen 35 is shaken off by the relative movement between the elastic ball 37 and the hollow column 31 to generate vibration. The filter screen 35 together with the sleeve column 32 moves along the axial length direction of the hollow column 31 by adjusting the change of the wind force.

[0026] In this embodiment, during use, the fan operating gear can be changed to automatically adjust the sleeve 32 and the filter 35 to move up and down, and form a certain vibration effect, so that foreign matter on the surface of the filter 35 can be shaken off. While blocking larger external foreign matter, it can effectively prevent foreign matter from mixing into the heat dissipation area of ​​the motor. Example 3

[0027] like Figures 8 to 9 As shown, on the basis of Example 1, it is further proposed that an adjustment structure 4 is provided on the inner wall surface of the motor housing 1 near the air inlet hole 2, and the adjustment structure 4 includes a limit plate 42 fixedly connected to the inner wall surface of the motor housing 1 near the support ring 9, a movable plate 41 is slidably connected between the limit plate 42 and the motor housing 1, a protruding plate 43 is fixedly connected to the surface of one end of the movable plate 41, a through column 44 is penetrated and connected to the outer surface of the protruding plate 43, an expansion spring 45 is connected between the protruding plate 43 and the support ring 9, and a limit head 46 is fixedly connected to one end of the through column 44.

[0028] The movable plate 41 slides between the limit plate 42 and the motor housing 1, and the protruding plate 43 slides along the length direction of the through column 44. One end of the through column 44 is fixedly connected to the support ring 9. The expansion spring 45 is a spring that expands when heated and contracts when pre-cooled. The expansion spring 45 is sleeved on the outer surface of the through column 44, and the inner diameter of the expansion spring 45 is larger than the diameter of the through column 44; the elastic ends of the expansion spring 45 are respectively fixedly connected to the protruding plate 43 and the support ring 9, and the limit head 46 is used to limit the maximum distance that the protruding plate 43 moves inward. The movable plate 41 penetrates the support ring 9, and the movable plate 41 is slidably connected to the support ring 9, the motor housing 1 and the limit plate 42.

[0029] In this embodiment, during use, when the temperature inside the motor corresponding to the air outlet cavity 14 rises, the expansion spring 45 can be allowed to expand accordingly, so that the opening size of the air inlet hole 2 can be automatically adjusted according to the internal temperature of the motor, which can achieve a better heat dissipation effect.

[0030] In summary, the use principle of the present invention is as follows: During use, the motor starts, and the rotor 5, the shaft 6, and the blades 7 rotate accordingly. At this time, the rotation of the blades 7 draws cold air outside the motor housing 1 from the opening of the air inlet 2, and the cold air is drawn into the interior of the air passage 11. The cold air enters the air outlet opening 13 from the gap between the rotor 5 and the stator winding 8, and enters the interior of the air outlet cavity 14 through the air outlet opening 13. Finally, the airflow carries heat to form hot air, which is discharged outward from the opening of the air outlet pipe 12. During the operation of the above-mentioned motor, the wind generated by the operation of the motor can blow the filter net 35 to push the sleeve column 32 and the sleeve cover 33 downward. At this time, the reset spring 34 will be compressed. During the compression process, the elastic ball 37 will move downward along the through hole 36. By the movement of the elastic ball 37 in the through holes 36 at different positions, the sleeve column 32 and the filter net 35 can achieve a vibration effect. During this process, the vibrating filter net 35 can conveniently shake off the foreign objects blocking its surface. When not in use, under the reaction force of the reset spring 34, it can push the sleeve cover 33, the sleeve column 32, the elastic ball 37 and the elastic ball 37 upward, so as to effectively shake off the foreign objects on the surface of the filter net 35, effectively separating the foreign objects and shaking them off while maintaining the function of filtering air; During the operation of the above-mentioned motor, when the internal heat of the motor increases, the heat blown into the air outlet cavity 14 from the motor will increase. At this time, the expansion spring 45 will expand, so as to push the protruding plate 43 and the movable plate 41 towards the direction of the limit head 46. At this time, the other end of the movable plate 41 will move a certain distance from the lower end of the air inlet hole 2. At this time, the opening of the air inlet hole 2 communicating with the internal through air passage 11 will increase, so that the size of the opening of the air inlet hole 2 communicating with the through air passage 11 can be automatically adjusted according to the temperature of the internal operation of the motor, achieving a better heat dissipation effect.

[0031] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high-efficiency cooling high-speed permanent magnet synchronous motor, comprising a motor housing (1), characterized in that: An air inlet hole (2) is provided on the outer surface of the motor housing (1); a support ring (9) is detachably connected to the inside of the motor housing (1); a stator winding (8) is fixedly connected to the inner side of the support ring (9); a rotor (5) is rotatably connected to the inner side of the stator winding (8); a rotating shaft (6) is fixedly connected to the middle of the rotor (5); blades (7) are fixedly connected to the outer surface of the rotating shaft (6); a cavity formed by the stator winding (8), the rotor (5), the motor housing (1) and the end cover (10) is an air passage (11); an air outlet pipe (12) is fixedly connected to the outer surface of the motor housing (1); an air outlet opening (13) is provided on the surface of the stator winding (8); and a cavity formed by the stator winding (8) corresponding to the inner side of the support ring (9), the support ring (9) and the motor housing (1) is an air outlet cavity (14).

2. The high-efficiency cooling high-speed permanent magnet synchronous motor according to claim 1, characterized in that: End covers (10) are fixedly connected to both ends of the motor housing (1), the blades (7) are provided in two groups and are symmetrically distributed, the air inlet (2) is connected to the air passage (11), the gap formed between the rotor (5) and the stator winding (8) is connected to both the air passage (11) and the air outlet opening (13), and the air outlet cavity (14) is connected to both the air outlet opening (13) and the air outlet pipe (12).

3. The high-efficiency cooling high-speed permanent magnet synchronous motor according to claim 2, characterized in that: The number of the support rings (9) is two groups and they are symmetrically distributed. The air outlet cavity (14) and the air passage (11) are separated by the two groups of support rings (9). The number of the air outlet openings (13) is a plurality of groups and they are distributed in a ring array. One end of the rotating shaft (6) extends outward from the center of the end cover (10). Cold air enters the air passage (11) from the air inlet hole (2), enters the air outlet opening (13) through the cavity formed by the rotor (5) and the stator winding (8), enters the interior of the air outlet cavity (14) through the air outlet opening (13), and finally discharges hot air through the air outlet pipe (12). The flow of air is achieved by the rotation of the blades (7).

4. The high-efficiency cooling high-speed permanent magnet synchronous motor according to claim 1, characterized in that: A dust removal structure (3) is provided on the outer surface of the motor housing (1) near the air inlet hole (2), the dust removal structure (3) comprising a hollow column (31) fixedly connected to the outer surface of the motor housing (1) near the air inlet hole (2), a sleeve column (32) being movably sleeved on the outer surface of the hollow column (31), a sleeve cover (33) being fixedly connected to the outer surface of the sleeve column (32), a return spring (34) being connected between the sleeve cover (33) and the motor housing (1), a filter screen (35) being detachably connected to the upper end surface of the sleeve column (32), a through hole (36) being provided on the outer surface of the hollow column (31), and an elastic ball (37) being fixedly connected to the inner wall surface of the sleeve column (32).

5. The high-efficiency cooling high-speed permanent magnet synchronous motor according to claim 1, characterized in that: An adjustment structure (4) is provided on the inner wall surface of the motor housing (1) near the air inlet hole (2), and the adjustment structure (4) comprises a limit plate (42) fixedly connected to the inner wall surface of the motor housing (1) near the support ring (9), a movable plate (41) is slidably connected between the limit plate (42) and the motor housing (1), a protruding plate (43) is fixedly connected to one end surface of the movable plate (41), a through column (44) is penetrated and connected to the outer surface of the protruding plate (43), an expansion spring (45) is connected between the protruding plate (43) and the support ring (9), and one end of the through column (44) is fixedly connected to a limit head (46).

6. The high-efficiency cooling high-speed permanent magnet synchronous motor according to claim 4, characterized in that: The inner diameter of the hollow column (31) is greater than the diameter of the air inlet hole (2); the sleeve column (32) slides up and down along the hollow column (31); the sleeve cover (33) is a cylindrical structure with a hollow bottom that is recessed inwards; the through holes (36) are provided in a plurality of groups and are distributed at equal intervals in the vertical direction.

7. The high-efficiency cooling high-speed permanent magnet synchronous motor according to claim 6, characterized in that: The inner diameter of the sleeve column (32) matches the outer diameter of the hollow column (31); the return spring (34) is arranged vertically, and the elastic ends of the return spring (34) are respectively fixedly connected to the inner wall of the sleeve cover (33) and the surface of the motor housing (1); and the elastic ball (37) is an elastic hemispherical structure.

8. The high-efficiency cooling high-speed permanent magnet synchronous motor according to claim 7, characterized in that: The diameter of the elastic ball (37) is smaller than the diameter of the through hole (36), and the position of the elastic ball (37) corresponds to the position of the through hole (36). Vibration is generated by relative movement between the elastic ball (37) and the hollow column (31) to shake off dust on the surface of the filter screen (35), and the filter screen (35) and the sleeve column (32) are moved along the axial length direction of the hollow column (31) by adjusting the wind force.

9. The high-efficiency cooling high-speed permanent magnet synchronous motor according to claim 5, characterized in that: The movable plate (41) slides between the limit plate (42) and the motor housing (1), and the protruding plate (43) slides along the length direction of the through-column (44). One end of the through-column (44) is fixedly connected to the support ring (9). The expansion spring (45) is a spring that expands when heated and contracts when pre-cooled. The expansion spring (45) is sleeved on the outer surface of the through-column (44), and the inner diameter of the expansion spring (45) is greater than the diameter of the through-column (44).

10. The high-efficiency cooling high-speed permanent magnet synchronous motor according to claim 9, characterized in that: The elastic ends of the expansion spring (45) are respectively fixedly connected to the protruding plate (43) and the supporting ring (9); the limit head (46) is used to limit the maximum distance of the protruding plate (43) moving inward; the movable plate (41) passes through the supporting ring (9); and the movable plate (41) is slidably connected to the supporting ring (9), the motor housing (1) and the limit plate (42).

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