A brushless motor

Abstract

The utility model discloses a brushless motor, include: casing, closed magnet protection cover, install in casing outside, stator, install in casing inside, rotor, install in casing inside and rotationally arranged to occur relative rotation with stator. Magnet protection cover is closed, can make magnetic circuit closed loop, reduce reluctance, and casing with magnet protection cover is magnetically conductive material, can increase the area of stator slot from structure, or increase the diameter of rotor, relative to general brushless structure, power is bigger, adapts the demand of various hydraulic tongs. The utility model does not need to open mould, and the original mould is used to make the shell made of magnetically conductive material, and the cost is smaller for the hydraulic tongs to replace the brush motor with the brushless motor.

Description

Technical Field

[0001] This utility model belongs to the field of brushless motor technology, and specifically relates to a brushless motor. Background Technology

[0002] Currently, all hydraulic clamps use permanent magnet brushed motors. Brushed motors have a complex structure and high cost. The protective sleeve on the outer shell needs to have a notch. They can cause sparks and interference during use, and are prone to explosion in some situations. Therefore, brushless motors are needed. However, in order to produce motors that are compatible with hydraulic clamps, new molds need to be made to produce the motors, which is too costly.

[0003] Existing brushless motors have an aluminum alloy shell surrounding an iron core, but the aluminum alloy shell is not a magnetic conductor and cannot meet the requirements of hydraulic clamps. Utility Model Content

[0004] To solve at least one of the above-mentioned technical problems, this utility model provides a brushless motor, comprising:

[0005] chassis;

[0006] A closed magnetic sleeve is installed on the outside of the housing;

[0007] The stator is installed inside the housing;

[0008] The rotor is mounted inside the housing and rotatably configured to rotate relative to the stator.

[0009] The width of the magnetic sleeve is greater than the width of the stator and rotor. Heat dissipation holes are provided on the outer casing outside the scope of the magnetic sleeve. The stator includes a stator yoke and stator teeth, with stator slots formed between adjacent stator teeth. Each stator tooth includes a vertical portion and a horizontal portion pointing towards the stator center. Several horizontal portions form a ring, with a gap between two horizontal portions. The side of the horizontal portion closer to the center is an arc surface, while the side farther from the center is a sloping surface that gradually narrows from the vertical portion to both sides.

[0010] The rotor has a circular cross-section with a central mounting hole for fixing the output shaft. Fitting holes are located around the mounting hole. Four fitting holes are arranged in a square. Each fitting hole includes a rectangular hole and wedge-shaped holes on either side of the rectangular hole that communicate with it. The outer casing has an output hole. The output shaft is fixed at the center of rotation, and a bearing is installed between the output shaft and the output hole.

[0011] Compared with the prior art, the advantages of this utility model are: the magnetic sleeve is closed, which can make the magnetic circuit closed-loop and reduce magnetic resistance; and the housing and the magnetic sleeve are made of magnetically conductive material, which can increase the area of ​​the stator slot or the diameter of the rotor from the structure. Compared with the general brushless structure, it has greater power and can meet the needs of various hydraulic clamps.

[0012] This invention eliminates the need for mold making, allowing the use of existing molds to create a shell made of magnetically conductive material. This reduces costs for replacing brushed motors with brushless motors in hydraulic clamps. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of a traditional brushed motor.

[0014] Figure 2 This is a schematic diagram of a traditional brushless motor.

[0015] Figure 3 This is a schematic diagram of the structure of the brushless motor of this utility model;

[0016] Figure 4 This is a cross-sectional schematic diagram of the present invention;

[0017] Figure 5 This is a three-dimensional cross-sectional view of the present invention;

[0018] Figure label:

[0019] 1. Brushed motor; 101 sheath;

[0020] 2. Aluminum alloy casing; 201 rotor; 202 stator slot; 203 stator yoke;

[0021] 3. Housing; 4. Closed magnetic sleeve; 5. Stator; 6. Rotor; 7. Heat dissipation hole; 8. Stator tooth; 9. Stator slot; 10. Vertical part; 11. Horizontal part; 12. Inclined surface; 13. Mounting through hole; 14. Mating through hole; 15. Output hole; 16. Output shaft; 17. Bearing; 18. Rectangular through hole; 19. Wedge-shaped through hole; 20. Stator yoke. Detailed Implementation

[0022] To enable those skilled in the art to better understand this utility model and to more clearly define the scope of protection claimed by this utility model, the present utility model is described in detail below with reference to certain specific embodiments. It should be noted that the following are only some specific embodiments of the present utility model concept, and are only a part of the embodiments of this utility model. The specific and direct description of related structures is only for the convenience of understanding this utility model, and the specific features do not necessarily or directly limit the scope of implementation of this utility model.

[0023] Referring to the accompanying drawings, this utility model adopts the following technical solution: this utility model provides a brushless motor, comprising:

[0024] Casing 3;

[0025] A closed magnetic sleeve 4 is installed outside the housing 3;

[0026] Stator 5 is installed inside the housing 3;

[0027] The rotor 6 is installed inside the housing 3 and is rotatably arranged to rotate relative to the stator 5.

[0028] The width of the magnetic sleeve is greater than the width of the stator 5 and rotor 6. Heat dissipation holes 7 are provided on the outer casing outside the scope of the magnetic sleeve. The stator 5 includes a stator yoke 20 and stator teeth 8, with stator slots 9 formed between adjacent stator teeth 8. Each stator tooth 8 includes a vertical portion 10 pointing towards the center of the stator 5 and a horizontal portion 11. Several horizontal portions 11 form a ring, and there is a gap between two horizontal portions 11. The side of the horizontal portion 11 closest to the center is an arc surface, and the side away from the center is an inclined surface 12 that gradually narrows from the vertical portion 10 to both sides.

[0029] The rotor 6 has a circular cross-section and a mounting hole 13 for fixing the output shaft 16 is provided in the center. There are mating holes 14 around the mounting hole 13. The mating holes 14 are arranged in a square with four holes arranged in a square.

[0030] The through hole 14 includes a rectangular through hole 18 and wedge-shaped holes 19 disposed on both sides of the rectangular through hole 18 and communicating with the rectangular through hole 18. The housing has an output hole 15, the rotation center is fixed to the output shaft 16, the output shaft 16 passes through the output hole 15 and a bearing 17 is installed between the output shaft 16 and the output hole 15.

[0031] Compared with the prior art, the advantages of this utility model are: the magnetic sleeve is closed, which can make the magnetic circuit closed-loop and reduce magnetic resistance; and the housing 3 and the magnetic sleeve are made of magnetic conductive material, which can increase the area of ​​the stator slot 9 or the diameter of the rotor 6 from the structure. Compared with the general brushless structure, it has greater power and can meet the needs of various hydraulic clamps.

[0032] That is, compared with this utility model, Figure 2 As shown, the stator yoke 20 of this invention is narrower, and the rotor 6 has a larger diameter.

[0033] This invention eliminates the need for mold making, allowing the use of existing molds to create a shell made of magnetically conductive material. This reduces costs for replacing brushed motors with brushless motors in hydraulic clamps.

[0034] The technical solution of this utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.

Claims

1. A brushless motor, characterized in that: include: Casing (3); A closed magnetic sleeve (4) is installed outside the housing (3); The stator (5) is installed inside the housing (3); The rotor (6) is installed inside the housing (3) and is rotatably arranged to rotate relative to the stator (5).

2. The brushless motor according to claim 1, characterized in that: The housing (3) and the magnetic sleeve are made of magnetically conductive material.

3. The brushless motor according to claim 2, characterized in that: The width of the magnetic sleeve is greater than the width of the stator (5) and rotor (6).

4. The brushless motor according to claim 1, characterized in that: Heat dissipation holes (7) are provided on the outer shell located outside the range of the magnetic sleeve.

5. The brushless motor according to claim 1, characterized in that: The stator (5) includes a stator yoke (20) and stator teeth (8), with stator slots (9) formed between two adjacent stator teeth (8).

6. The brushless motor according to claim 5, characterized in that: The stator tooth (8) includes a vertical part (10) pointing to the center of the stator (5) and a horizontal part (11). Several horizontal parts (11) form a ring and there is a gap between two horizontal parts (11). The side of the horizontal part (11) closer to the center is an arc surface, and the side away from the center is an inclined surface (12) that gradually narrows from the vertical part (10) to both sides.

7. The brushless motor according to claim 1, characterized in that: The rotor (6) has a circular cross-section and a mounting hole (13) for fixing the output shaft (16) is provided in the center. There are mating holes (14) on the periphery of the mounting hole (13).

8. The brushless motor according to claim 7, characterized in that: The fitting perforation (14) is provided in four parts, arranged in a square.

9. The brushless motor according to claim 8, characterized in that: The mating perforation (14) includes a rectangular perforation (18) and wedge-shaped holes (19) disposed on both sides of the rectangular perforation (18) and communicating with the rectangular perforation (18).

10. The brushless motor according to claim 1, characterized in that: An output hole (15) is provided on the outer casing, and an output shaft (16) is fixed at the rotation center. The output shaft (16) passes through the output hole (15) and a bearing (17) is installed between the output shaft (16) and the output hole (15).

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