A two-pole compact high-speed motor heat dissipation structure

Abstract

The present invention relates to a heat dissipation structure for a two-pole compact high-speed motor, belonging to the technical field of motors, and solves the technical problems such as poor heat dissipation effect in the existing internal air path circulation of motors. The heat dissipation structure of the present invention includes a machine base, a motor rotor and a motor stator. The motor rotor is rotatably installed in the machine base; the motor stator is fixedly arranged in the machine base, and the motor rotor is coaxially located in the axial central channel of the motor stator; a plurality of axial stator notches are opened on the inner side wall of the motor stator, and there is an air gap between the motor stator and the motor rotor, and the air gap and the stator notches form a first air duct; a plurality of axial ventilation holes are opened on the yoke of the motor stator; the first air duct, the axial ventilation holes and the cavities at the opposite ends of the motor stator in the machine base form an internal circulation air path. Through the above settings, the present invention cancels the ventilation of the rotor shaft hole, changes to the cooperation of the air gap and the stator notches for ventilation, and opens axial ventilation holes on the stator yoke to form an internal circulation air path, which can improve the internal circulation efficiency.

Description

Technical Field

[0001] The present invention belongs to the technical field of motors, and particularly relates to a heat dissipation structure for a two-pole compact high-speed motor. Background Art

[0002] For the existing two-pole compact high-speed motors on the market, the internal air duct circulation design in the industry generally involves setting several air guiding cavities in the machine base and the iron core, and setting axial ventilation holes in the rotor yoke, and then realizing the internal circulation through the rotation of the fan. This heat dissipation design method of the internal air duct circulation of the motor is relatively fixed. On the stator side, further improving its internal circulation heat dissipation capacity is extremely limited by the structure of the machine base casting. When increasing the area of the air guiding cavity of the machine base, it will have a negative impact on the contact heat dissipation area between the outer circle of the iron core and the inner wall of the machine base; the internal circulation cooling medium on the rotor side can only cool the axial ventilation holes of the rotor and then cool the temperature of the rotor bars by heat conduction, and the heat dissipation effect is poor. Summary of the Invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art, and provide a heat dissipation structure for a two-pole compact high-speed motor, which solves the technical problems such as poor heat dissipation effect existing in the existing internal air duct circulation of the motor.

[0004] To solve the above problems, the technical solution of the present invention is: a heat dissipation structure for a two-pole compact high-speed motor, comprising:

[0005] A machine base;

[0006] A motor rotor, rotatably installed in the machine base;

[0007] A motor stator, fixedly arranged in the machine base, and the motor rotor is coaxially located in the axial center channel of the motor stator; a plurality of axial stator slots are opened on the inner side wall of the motor stator, and there is an air gap between the motor stator and the motor rotor, and the air gap and the stator slots form a first air duct; a plurality of axial ventilation holes are opened on the yoke of the motor stator; the first air duct, the axial ventilation holes and the cavities at the opposite ends of the motor stator in the machine base form an internal circulation air path;

[0008] A wind guiding cylinder is fixedly arranged on the side wall of the rotating shaft of the motor rotor, an insulating sealing ring is arranged on a part of the coils of the motor stator, the wind guiding cylinder is adjacent to the insulating sealing ring, and an air sealing cavity is formed by the wind guiding cylinder, the insulating sealing ring, the motor rotor and the coils; a fan is fixedly arranged on the side wall of the rotating shaft in the machine base, and a second air duct is provided in the fan. One end opening of the first air duct and one end opening of the second air duct are both located in the air sealing cavity, and the other end opening of the second air duct is located outside the air sealing cavity.

[0009] Optionally, connecting rods are inserted through some of the axial ventilation holes, and pressing heads are arranged at both ends of the connecting rods to press the stator punching sheets of the motor stator.

[0010] Optionally, the connecting rod is a screw rod, one of the pressing heads is the end of the screw rod, and the other pressing head is a nut threadedly installed on the screw rod.

[0011] Optionally, an insulating seal is wound around the outer periphery of the coil that extends outside one end of the motor stator and is adjacent to the motor rotor. One end of the insulating seal is adjacent to or in sealed contact with one end of the motor stator, and the other end of the insulating seal is adjacent to or in sealed contact with the insulating seal ring.

[0012] Optionally, a plurality of air guiding cavities are provided at both ends of the machine base close to the motor stator.

[0013] Optionally, 4 air guiding cavities are provided at both ends of the machine base close to its opposite ends, and the 4 air guiding cavities are evenly distributed on the outer side wall of the machine base.

[0014] Optionally, the connecting rod is a screw rod, and both pressing heads are nuts threadedly installed on the screw rod.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] 1. The present invention provides a new design concept for the internal air path, optimizes the heat dissipation capacity of the motor, thereby improving the single-motor power density and the material utilization rate.

[0017] 2. The present invention cancels the stator outer circle retaining ring groove, increasing the contact heat dissipation area between the outer circle of the stator core and the inner wall of the machine base.

[0018] 3. The present invention uses a long screw rod to tightly fix the stator core, with better rigidity, and greatly reduces the production difficulty of fastening the stator core. Description of the Drawings

[0019] Figure 1 It is a schematic diagram of the heat dissipation structure in the embodiment;

[0020] Figure 2 It is a schematic diagram of the installation of the connecting rod in the embodiment;

[0021] Figure 3 It is a schematic diagram of the positions of the motor rotor and the motor stator in the embodiment;

[0022] Figure 4 It is a schematic diagram of the structure of the air gap and the stator slot opening in the embodiment;

[0023] Figure 5 It is a schematic diagram of the structure of the air guiding cavity of the machine base in the embodiment.

[0024] Reference numerals: 1, frame; 11, air seal cavity; 12, air guide cavity; 2, motor rotor; 3, motor stator; 31, stator slot opening; 32, air gap; 33, axial ventilation hole; 34, first air duct; 4, rotating shaft; 41, fan; 42, second air duct; 43, air guide cylinder; 5, connecting rod; 51, pressure head; 6, coil; 61, insulating seal; 62, insulating seal ring. Detailed implementation mode

[0025] The present invention will be further described in detail below with reference to the drawings and embodiments.

[0026] Embodiment: As Figures 1 - 5 shown, this embodiment provides a heat dissipation structure for a two-pole compact high-speed motor, including a frame 1, a motor rotor 2 and a motor stator 3. The motor rotor 2 is rotatably installed in the frame 1; the motor stator 3 is fixedly arranged in the frame 1, and the motor rotor 2 is coaxially located in the axial center channel of the motor stator 3; a plurality of axial stator slot openings 31 are formed on the inner side wall of the motor stator 3, and there is an air gap 32 between the motor stator 3 and the motor rotor 2. The air gap 32 and the stator slot opening 31 form a first air duct 34; a plurality of axial ventilation holes 33 are formed in the yoke of the motor stator 3; the first air duct 34, the axial ventilation holes 33 and the cavities at the opposite ends of the motor stator 3 in the frame 1 form an internal circulation air path.

[0027] An air guide cylinder 43 is fixedly arranged on the side wall of the rotating shaft 4 of the motor rotor 2 near its right end. An insulating seal ring 62 is arranged on a part of the coil 6 of the motor stator 3. The air guide cylinder 43 is adjacent to the insulating seal ring 62, and the air guide cylinder 43, the insulating seal ring 62, the motor rotor 2 and the coil 6 enclose an air seal cavity 11; a fan 41 is fixedly arranged on the side wall of the rotating shaft 4 near its right end. The fan 41 is located in the frame 1. The fan 41 has a second air duct 42. One end opening of the first air duct 34 and one end opening of the second air duct 42 are both located in the air seal cavity 11, and the other end opening of the second air duct 42 is located outside the air seal cavity 11.

[0028] With the above settings, in this embodiment, the axial ventilation holes in the rotor yoke of the traditional solution are cancelled, and the ventilation of the cancelled axial ventilation holes in the rotor yoke is changed to the combined ventilation of the air gap 32 and the stator slot opening 31. Axial ventilation holes 33 are opened in the yoke of the motor stator 3 to form an internal circulation air path. When the slot shape of the stator slot opening 31 and the size of the air gap 32 are reasonably selected, the internal circulation efficiency can be improved. The combined ventilation of the air gap 32 and the stator slot opening 31 directly cools the heating elements on both sides of the air gap 32, and the heat dissipation efficiency is better. The air gap 32, the stator slot opening 31, the inner cavity of the machine base 1, and the added axial ventilation holes 33 in the yoke of the motor stator 3 form an internal circulation air path. The rotation of the fan 41 drives the gas to flow in the internal circulation air path to achieve internal circulation. To ensure the ventilation path of the internal circulation, the insulation sealing ring 62 and the air guide cylinder 43 are used in combination to achieve the function of air sealing, ensuring that the ventilation of the air gap 32 and the stator slot opening 31 enters the fan 41 according to the path and is discharged to achieve internal circulation.

[0029] Preferably, a plurality of axial ventilation holes 33 are circumferentially and uniformly distributed on the motor stator 3; a plurality of stator slot openings 31 are circumferentially and uniformly distributed on the inner side wall of the motor stator 3.

[0030] In a two-pole compact high-speed motor heat dissipation structure of this embodiment, a connecting rod 5 is inserted through a part of the axial ventilation holes 33, and pressing heads 51 are arranged at both ends of the connecting rod 5 to press the stator punching sheet of the motor stator 3.

[0031] Axial ventilation holes 33 are opened in the yoke of the motor stator 3. At the same time, 8-12 of the axial ventilation holes 33 are borrowed. After inserting the connecting rod 5 through the axial ventilation holes 33, pressing heads 51 are arranged on the connecting rod 5 to press the stator punching sheet, canceling the conventional method of opening a retaining ring groove on the outer circle of the punching sheet and welding ribs. This simplifies the structure, is convenient for assembly and processing, and has stable connection. In addition, canceling the retaining ring groove on the outer circle of the stator punching sheet further increases the contact heat dissipation area between the outer circle of the iron core of the motor stator 3 and the inner wall of the machine base 1, improving its heat dissipation effect. The axial ventilation holes 33 are not only used for gas passage but also for installing the connecting rod 5 to press the stator punching sheet, improving the material utilization rate, simplifying the structure, and having stable connection.

[0032] In a two-pole compact high-speed motor heat dissipation structure of this embodiment, the connecting rod 5 is a screw rod, one of the pressing heads 51 is the end of the screw rod, and the other pressing head 51 is a nut threadedly installed on the screw rod; or both pressing heads 51 are nuts threadedly installed on the screw rod. Using a long screw rod to fix the stator core has better rigidity, greatly reduces the production process difficulty of core fastening, has a simple structure, is convenient for assembly, and has stable connection.

[0033] In a heat dissipation structure of a two-pole compact high-speed motor according to this embodiment, an insulating seal 61 is wound around the outer periphery of a coil 6 that extends outside one end of a motor stator 3 and is adjacent to a motor rotor 2. One end of the insulating seal 61 is adjacent to or in sealing contact with one end of the motor stator 3, and the other end of the insulating seal 61 is adjacent to or in sealing contact with an insulating seal ring 62. To ensure the ventilation path of the internal circulation, the part of the coil 6 extending out of the iron core is sealed in the circumferential direction with the insulating seal 61 to prevent air from flowing out through the gaps of the coil 6 and affecting the internal circulation effect.

[0034] In a heat dissipation structure of a two-pole compact high-speed motor according to this embodiment, 4 air guide cavities 12 are provided near the opposite ends of a motor frame 1, and the 4 air guide cavities 12 are evenly distributed on the outer side wall of the motor frame 1.

Claims

1. A two-pole compact high-speed motor heat dissipation structure, characterized in that: include: Machine base (1); A motor rotor (2) is rotatably mounted in the base (1); The motor stator (3) is fixedly arranged in a machine base (1), and the motor rotor (2) is coaxially located in an axial central channel of the motor stator (3); a plurality of axial stator slots (31) are provided on the inner side wall of the motor stator (3), an air gap (32) is provided between the motor stator (3) and the motor rotor (2), and the air gap (32) and the stator slot (31) form a first air duct (34); a plurality of axial ventilation holes (33) are provided on the yoke of the motor stator (3); the first air duct (34), the axial ventilation holes (33) and the cavities located at opposite ends of the motor stator (3) in the machine base (1) form an internal circulation air path; An air guide tube (43) is fixedly arranged on the side wall of the rotating shaft (4) of the motor rotor (2), an insulating sealing ring (62) is arranged on a part of the coil (6) of the motor stator (3), the air guide tube (43) is adjacent to the insulating sealing ring (62), and the air guide tube (43), the insulating sealing ring (62), the motor rotor (2) and the coil (6) form an air-sealed cavity (11); a fan (41) is fixedly arranged on the side wall of the rotating shaft (4) in the machine base (1), a second air duct (42) is provided in the fan (41), one end opening of the first air duct (34) and one end opening of the second air duct (42) are both located in the air-sealed cavity (11), and the other end opening of the second air duct (42) is located outside the air-sealed cavity (11); The commonly used method of punching the outer circle of the plate to open the buckle plate groove and weld the ribs in the industry is eliminated; the axial air holes in the rotor yoke in the traditional solution are eliminated; A connecting rod (5) is inserted through a portion of the axial ventilation holes (33), and pressure heads (51) are provided at both ends of the connecting rod (5) to press the stator punching sheets of the motor stator (3); An insulating seal (61) is wound around the outer circumference of a coil (6) extending out of one end of the motor stator (3) and adjacent to the motor rotor (2); one end of the insulating seal (61) is adjacent to or in sealing contact with one end of the motor stator (3); and the other end of the insulating seal (61) is adjacent to or in sealing contact with an insulating seal ring (62); The air guide tube (43) is located on the inner side of the coil (6), and the outer end of the air guide tube (43) is close to the insulating sealing ring (62) on the inner side of the coil (6).

2. A two-pole compact high-speed motor heat dissipation structure according to claim 1, characterized in that: The connecting rod (5) is a screw rod, one of which has a pressing head (51) as the end of the screw rod, and the other pressing head (51) as a nut threadedly mounted on the screw rod.

3. A two-pole compact high-speed motor heat dissipation structure according to claim 1, characterized in that: A plurality of air guide cavities (12) are arranged at both ends of the machine base (1) close to the motor stator (3).

4. A two-pole compact high-speed motor heat dissipation structure according to claim 3, characterized in that: Four air guide cavities (12) are arranged on the machine base (1) near two opposite ends thereof, and the four air guide cavities (12) are evenly distributed on the outer side wall of the machine base (1).

5. A two-pole compact high-speed motor heat dissipation structure according to claim 1, characterized in that: The connecting rod (5) is a screw rod, and the two pressing heads (51) are nuts threadedly mounted on the screw rod.

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