Heat dissipation structure of permanent magnet motor

Abstract

The utility model relates to the technical field of motors, in particular to a heat dissipation structure of a permanent magnet motor. The heat dissipation structure comprises a stator assembly and a rotor assembly, the stator assembly comprises an end cover, and the rotor assembly comprises an annular first side plate. A plurality of air inlet holes are formed in the end cover, and the outer edge of the end cover is connected with an annular second side plate. One end of the first side plate extends inwards to form an annular connecting part, the connecting part is fixedly connected with a first centrifugal fan, a plurality of first air outlet holes are formed in the first side plate, and a plurality of second air outlet holes are formed in the second side plate. During use, the first centrifugal fan forces cooling air to pass through the gap between the magnetic steel and the stator iron core after passing through the air inlet holes to take away heat on the surface of the magnetic steel and the surface of the stator iron core, and part of the cooling air takes away heat of a copper wire from a slot gap of the stator iron core and then is discharged outwards through the first air outlet holes and the second air outlet holes. And the heat dissipation effect in the motor is effectively improved, so that the working stability and the service life of the motor are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and particularly relates to a heat dissipation structure of a permanent magnet motor. Background Art

[0002] The stator used in an outer rotor motor usually includes a sleeve seat and a stator assembly. The stator assembly includes a stator core formed by laminating a plurality of silicon steel sheets, an end insulation installed on the end face of the stator core, and a coil winding wound on the end insulation. The stator assembly is sleeved outside the sleeve seat. Since the heat generated inside the motor during operation dissipates naturally relatively slowly, the operation of the motor becomes unreliable, and at the same time, the service life of the motor is shortened.

[0003] In order to solve the heat dissipation problem, a Chinese patent (Publication No.: CN209233661U) provides an outer rotor motor. The motor includes a rotating shaft, a stator assembly, an outer rotor, and a sleeve seat. A flange extends outwards from the opening of the casing sleeve. A wind wheel is installed at the bottom of the flange. A plurality of wind blades are circumferentially arranged upwards on the outer ring of the wind wheel. An inner ring of the wind wheel is arranged inside the outer ring of the wind wheel. The outer ring of the wind wheel is connected to the inner ring of the wind wheel. The gap between the outer ring of the wind wheel and the inner ring of the wind wheel forms an air inlet. A plurality of raised heat dissipation fins are provided on the bottom plate at the position below the wind wheel. An air duct is formed between two adjacent heat dissipation fins. The outer ring of the wind wheel covers the top of the air duct. The outer ring of the wind wheel, the flange, and the plurality of wind blades form a centrifugal fan. When the outer rotor rotates, it drives the wind wheel to rotate. The air flow enters the air duct radially, and then flows into the gap. Under the action of the plurality of wind blades, it is radially thrown outwards.

[0004] Although this heat dissipation structure improves the heat dissipation effect, since the top is closed and the inside of the motor is a semi-closed structure, and the stator is in the central area inside, the heat generated by the winding is difficult to dissipate or discharge, and the heat dissipation effect inside the motor is poor. Summary of the Utility Model

[0005] Aiming at the above defects, the technical problem to be solved by the utility model is to provide a heat dissipation structure of a permanent magnet motor, which can improve the heat dissipation effect inside the motor.

[0006] The above technical object of the utility model is achieved by the following technical solutions:

[0007] A heat dissipation structure of a permanent magnet motor, comprising a stator assembly and a rotor assembly. The stator assembly includes an end cover and a stator core, and the stator core is fixedly connected to the end cover. The rotor assembly includes an annular first side plate and a plurality of magnetic steels evenly distributed along the circumferential direction inside the first side plate. A plurality of air inlet holes are formed in the end cover, and an annular second side plate is connected to the outer edge of the end cover. The first side plate is located inside the second side plate, and the stator core is installed within the range enclosed by the magnetic steels. One end of the first side plate away from the end cover extends inward to form an annular connecting portion. A circular first centrifugal fan is fixedly connected to one side of the connecting portion close to the end cover. A plurality of first air outlet holes corresponding to the first centrifugal fan are formed in the first side plate along the circumferential direction. A plurality of second air outlet holes corresponding to the first air outlet holes are formed in the second side plate.

[0008] By adopting the above scheme, during use, the rotor assembly rotates, and the first side plate in the rotor assembly drives the connecting portion and the first centrifugal fan to rotate. Under the action of the first centrifugal fan, cooling air is forced to enter the inner sides of the stator assembly and the rotor assembly through the air inlet holes of the end cover. The cooling air passes through the gaps between the magnetic steels and the stator core, taking away the heat on the surfaces of the magnetic steels and the stator core. Moreover, part of the cooling air takes away the heat of the copper wire from the slot gaps of the stator core. The cooling air carrying the exchanged heat is discharged outside the second side plate after passing through the first air outlet holes and the second air outlet holes. The heat dissipation effect inside the motor is effectively improved, thereby ensuring the working stability and service life of the motor.

[0009] The present utility model is further arranged such that an annular second centrifugal fan is fixedly connected to the outer side of the first side plate, and the second centrifugal fan corresponds to the first air outlet holes. During use, the air flow velocity inside the motor is enhanced by the second centrifugal fan, thereby improving the cooling effect inside the motor.

[0010] The present utility model is further arranged such that the first side plate has a diameter-expanded section and a diameter-reduced section along its axial direction, and the first air outlet holes are located within the range of the diameter-reduced section. Since the first air outlet holes are located within the range of the diameter-reduced section, the cooling air is compressed when entering the diameter-reduced section from the diameter-expanded section, thereby increasing the flow velocity of the cooling air and improving the heat dissipation effect.

[0011] The present utility model is further arranged such that a step is formed at the junction of the diameter-expanded section and the diameter-reduced section, and the second centrifugal fan is fixed at the step. The second centrifugal fan is located between the diameter-reduced section of the first side plate and the second side plate. Since the second centrifugal fan is fixed at the step, while increasing the air flow velocity inside the motor, it can also ensure that the volume of the motor along the radial direction does not increase. Moreover, the step provides an installation position for the second centrifugal fan, making it more convenient for the second centrifugal fan to be fixedly connected to the first side plate, and the overall structure is more reasonable.

[0012] The present utility model is further configured such that a flange is connected to the free end of the second side plate. Through the flange at the free end of the second side plate, the stator assembly can be conveniently connected to the corresponding motor housing, facilitating fixation.

[0013] The present utility model is further configured such that two rows of air inlet holes are provided along the radial direction of the end cover. The air intake volume is increased through the two rows of air inlets, which is beneficial for heat dissipation.

[0014] The present utility model is further configured such that a retaining ring is provided inside the first side plate, and mounting holes corresponding to a plurality of the magnetic steels are formed in the retaining ring, and the magnetic steels are fixed in the corresponding mounting holes. The magnetic steels can be fixed more stably through the retaining ring.

[0015] The present utility model is further configured such that the stator assembly further includes a mounting seat and an annular fixing frame. The stator core is fixed outside the fixing frame. A through hole is formed in the middle of the end cover. The mounting seat is partially installed in the through hole. The mounting seat is located between the end cover and the fixing frame. The end cover, the mounting seat, and the fixing frame are fixed together by bolts. The connection by bolts between the end cover, the mounting seat, and the fixing frame makes the assembly of each part more convenient. In addition, since the fixing frame is provided between the end cover and the fixing frame, a relatively large gap is formed between the stator core and the end cover, thus facilitating the circulation of the cooling air inside the motor.

[0016] The present utility model is further configured such that the fixing frame includes an inner ring and an outer ring. The diameter of the outer ring is larger than that of the inner ring. The inner diameter of the outer ring is larger than the outer diameter of the mounting seat. The inner ring and the outer ring are connected by a plurality of connecting columns. The area enclosed by the inner ring, the outer ring, and the adjacent connecting columns can facilitate the passage of the cooling air, facilitating the cooling air to enter the inner side of the stator assembly and enhancing the internal heat dissipation effect.

[0017] The present utility model is further configured such that the outer ring, the inner ring, and the connecting columns are integrally formed. Since the outer ring, the inner ring, and the connecting columns are integrally formed, the overall stability is better.

[0018] In summary, the heat dissipation structure of a permanent magnet motor provided by the present utility model has at least the following beneficial effects:

[0019] 1. By introducing the cooling air into the motor and discharging it from the second air outlet, the heat dissipation effect inside the motor is greatly improved.

[0020] 2. By providing the first centrifugal fan and the second centrifugal fan on the inner and outer sides of the rotor assembly, the flow velocity of the cooling air is increased, and the cooling effect is improved. Description of the Drawings

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0022] Figure 1 is a three-dimensional structural schematic diagram of the present invention from a top-down perspective;

[0023] Figure 2 is an exploded view of the present invention;

[0024] Figure 3 is a three-dimensional structural schematic diagram of the present invention from a bottom-up perspective;

[0025] Figure 4 is a rear view of the present invention;

[0026] Figure 5 is Figure 4 a cross-sectional view taken along line A-A in;

[0027] Figure 6 is a three-dimensional structural diagram of the first side plate of the present invention from a first side view perspective;

[0028] Figure 7 is a three-dimensional structural diagram of the first side plate of the present invention from a second side view perspective.

[0029] The reference numerals include: end cap 1, stator core 2, air inlet hole 3, first side plate 4, second side plate 5, connecting portion 6, first centrifugal fan 7, first air outlet hole 8, second air outlet hole 9, second centrifugal fan 10, step 11, flange 12, retaining ring 13, mounting hole 14, mounting seat 15, fixing frame 16, outer ring 161, inner ring 162, connecting column 163, through hole 17. Detailed implementation manners

[0030] To enable those skilled in the art to better understand the technical solutions of the present invention, the following will further elaborate on the present invention in conjunction with the attached Figures 1-7 drawings and specific implementation manners.

[0031] Please refer to Figures 1-7, a heat dissipation structure of a permanent magnet motor provided in this embodiment includes a stator assembly and a rotor assembly. Among them, the stator assembly includes an end cover 1 and a stator core 2, and the stator core 2 is fixedly connected to the end cover 1. The rotor assembly includes an annular first side plate 4 and a plurality of magnetic steels evenly distributed along the circumferential direction inside the first side plate 4. A plurality of air inlet holes 3 are formed in the end cover 1, and an annular second side plate 5 is connected to the outer edge of the end cover 1. In this embodiment, preferably, the air inlet holes 3 are arranged in two rows along the radial direction of the end cover 1, and each row of air inlet holes 3 is evenly distributed along the circumferential direction of the end cover 1. The first side plate 4 is located inside the second side plate 5, and the stator core 2 is installed within the range enclosed by the magnetic steels. Please refer to Figure 1 , Figure 2 and Figure 5 , one end of the first side plate 4 away from the end cover 1 extends inward to form an annular connecting portion 6, and an annular first centrifugal fan 7 is fixedly connected to the side of the connecting portion 6 close to the end cover 1. A plurality of first air outlet holes 8 corresponding to the first centrifugal fan 7 are formed in the first side plate 4 along the circumferential direction, and a plurality of second air outlet holes 9 corresponding to the first air outlet holes 8 are formed in the second side plate 5.

[0032] By adopting the above scheme, during use, the rotor assembly rotates, and the first side plate 4 in the rotor assembly drives the connecting portion 6 and the first centrifugal fan 7 to rotate. Under the action of the first centrifugal fan 7, the cooling air is forced to enter the inside of the rotor assembly through the air inlet holes 3 of the end cover 1. The cooling air passes through the gap between the magnetic steels and the stator core 2, taking away the heat on the surfaces of the magnetic steels and the stator core 2. And part of the cooling air takes away the heat of the copper wire from the slot gaps of the stator core 2. The cooling air carrying the exchanged heat is discharged outside the second side plate 5 after passing through the first air outlet holes 8 and the second air outlet holes 9. The heat dissipation effect inside the motor is effectively improved, thereby ensuring the working stability and service life of the motor.

[0033] In order to further enhance the heat dissipation effect, further, an annular second centrifugal fan 10 is fixedly connected to the outside of the first side plate 4, and the second centrifugal fan 10 corresponds to the first air outlet holes 8. The first side plate 4 has a diameter-expanded section and a diameter-reduced section along its axial direction. The diameter-expanded section is close to the end cover 1, and the diameter-reduced section is away from the end cover 1. The diameter of the diameter-expanded section is larger than that of the diameter-reduced section. The magnetic steels are installed within the range of the diameter-expanded section, and the first air outlet holes 8 are located within the range of the diameter-reduced section. A step 11 is formed at the junction of the diameter-expanded section and the diameter-reduced section, and the second centrifugal fan 10 is fixed at the step 11. The second centrifugal fan 10 is located between the diameter-reduced section of the first side plate 4 and the second side plate 5. The air flow velocity inside the motor is enhanced by the second centrifugal fan 10, thereby improving the cooling effect inside the motor.

[0034] In order to facilitate the connection with the box corresponding to the motor, further, a flange 12 is connected to the free end of the second side plate 5, and the flange 12 extends outward from the second side plate 5.

[0035] Please refer to Figure 3, in some embodiments, a protective ring 13 is provided on the inner side of the first side plate 4. Mounting holes 14 corresponding to a plurality of magnetic steels are formed in the protective ring 13, and the magnetic steels are fixed in the corresponding mounting holes 14. The stator assembly further includes a mounting seat 15 and an annular fixing frame 16, and the stator core 2 is fixed to the outer side of the fixing frame 16. A through hole 17 is formed in the middle of the end cover 1, and a part of the mounting seat 15 is installed in the through hole 17. The mounting seat 15 is located between the end cover 1 and the fixing frame 16, and the end cover 1, the mounting seat 15 and the fixing frame 16 are fixed together by bolts. The fixing frame 16 includes an inner ring 162 and an outer ring 161. The diameter of the outer ring 161 is greater than that of the inner ring 162, and the inner diameter of the outer ring 161 is greater than the outer diameter of the mounting seat 15. The inner ring 162 and the outer ring 161 are connected by a plurality of connecting columns 163, and the outer ring 161, the inner ring 162 and the connecting columns 163 are integrally formed.

[0036] It should be noted that the words indicating directions in this article, such as up and down, etc., are all set in the Figure 1 direction for the convenience of description only and have no other specific meanings.

[0037] It should also be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, so that an article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of another identical element in the article or device including the above elements.

[0038] Specific examples are used in this article to elaborate on the principles and implementation manners of the present invention. The description of the above embodiments is only used to help understand the core idea of the present invention. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A heat dissipation structure of a permanent magnet motor, comprising a stator assembly and a rotor assembly, wherein the stator assembly comprises an end cover (1) and a stator core (2), wherein the stator core (2) is fixedly connected to the end cover (1), and the rotor assembly comprises an annular first side plate (4) and a plurality of magnetic steels uniformly distributed on the inner side of the first side plate (4) along a circumferential direction, characterized in that: The end cover (1) is provided with a plurality of air inlet holes (3); the outer edge of the end cover (1) is connected to a second annular side plate (5); the first side plate (4) is located on the inner side of the second side plate (5); the stator core (2) is installed within the range enclosed by the magnetic steel; one end of the first side plate (4) away from the end cover (1) extends inward to form an annular connecting portion (6); a side of the connecting portion (6) close to the end cover (1) is fixedly connected to a first annular centrifugal fan (7); the first side plate (4) is provided with a plurality of first air outlet holes (8) corresponding to the first centrifugal fan (7) along a circumferential direction; and the second side plate (5) is provided with a plurality of second air outlet holes (9) corresponding to the first air outlet holes (8).

2. A heat dissipation structure of a permanent magnet motor as claimed in claim 1, characterized in that: An annular second centrifugal fan (10) is fixedly connected to the outer side of the first side plate (4), and the second centrifugal fan (10) corresponds to the first air outlet (8).

3. A heat dissipation structure of a permanent magnet motor as claimed in claim 2, characterized in that: The first side plate (4) has an expanded diameter section and a reduced diameter section along its axial direction, and the first air outlet (8) is located within the reduced diameter section.

4. A heat dissipation structure of a permanent magnet motor as claimed in claim 3, characterized in that: A step (11) is formed at the intersection of the expanded diameter section and the reduced diameter section, and the second centrifugal fan (10) is fixed at the step (11). The second centrifugal fan (10) is located between the reduced diameter section of the first side plate (4) and the second side plate (5).

5. A heat dissipation structure of a permanent magnet motor as claimed in any one of claims 1 to 4, characterized in that: The free end of the second side plate (5) is connected to a flange (12).

6. A heat dissipation structure of a permanent magnet motor as claimed in claim 5, characterized in that: The air inlet holes (3) are arranged in two rows along the radial direction of the end cover (1).

7. A heat dissipation structure of a permanent magnet motor as claimed in claim 5, characterized in that: A protective ring (13) is provided on the inner side of the first side plate (4), and mounting holes (14) corresponding to a plurality of the magnetic steels are opened on the protective ring (13), and the magnetic steels are fixed in the corresponding mounting holes (14).

8. A heat dissipation structure of a permanent magnet motor as claimed in claim 1, characterized in that: The stator assembly further comprises a mounting seat (15) and an annular fixing frame (16); the stator core (2) is fixed on the outside of the fixing frame (16); a through hole (17) is provided in the middle of the end cover (1); a portion of the mounting seat (15) is mounted in the through hole (17); the mounting seat (15) is located between the end cover (1) and the fixing frame (16); and the end cover (1), the mounting seat (15) and the fixing frame (16) are fixed together by bolts.

9. A heat dissipation structure of a permanent magnet motor as claimed in claim 8, characterized in that: The fixing frame (16) comprises an inner ring (162) and an outer ring (161), the diameter of the outer ring (161) is larger than the diameter of the inner ring (162), the inner diameter of the outer ring (161) is larger than the outer diameter of the mounting seat (15), and the inner ring (162) and the outer ring (161) are connected via a plurality of connecting columns (163).

10. A heat dissipation structure of a permanent magnet motor as claimed in claim 9, characterized in that: The outer ring (161), the inner ring (162) and the connecting column (163) are integrally formed.

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