High-strength anti-cracking motor

Abstract

The utility model discloses a high-strength anti-cracking motor, which relates to the field of motor design and comprises a shell, a permanent magnet ring, a rotor and an end cover. Fillets are formed at the corners of the four side edges of the shell, transition edges are formed between the four side walls of the shell and the fillets, and the transition edges and the side walls of the shell form a micro-arc shape; the permanent magnet ring is of an integrated structure, the outer wall of the permanent magnet ring is fixedly installed in the inner wall of the shell through glue, a through hole is formed in the middle of the permanent magnet ring, and the rotor is installed in the through hole in a clearance fit mode. The rotor is rotatably mounted between the shell and the end cover in a matched manner, the end cover is fixedly mounted at the right end of the shell, and the end cover covers the middle parts of the permanent magnet ring and the rotor in the shell; according to the utility model, the side wall of the shell forms the circular arc curved surface by utilizing the transition edge, and the rounding is matched, so that the motor shell can be prevented from cracking, and the high-strength operation of the motor is met; the integrally arranged permanent magnet ring is arranged in the shell, so that the motor has the characteristic of convenience in assembly and is high in stability.

Description

Technical Field

[0001] The utility model relates to the field of motor design, and in particular to a high-strength anti-cracking motor. Background Art

[0002] In the prior art (Publication No.: CN202424335U, Publication Date: September 5, 2012), a compact and lightweight four-pole square permanent magnet DC motor is disclosed. It is provided with a polygonal outer shell, which has a simple process, can prevent the motor from rolling during placement and transportation, and has a high utilization rate of the external space; the permanent magnets are installed at the straight-edge joints, which can improve the space utilization rate inside the outer shell and reduce the overall dimensions.

[0003] In the above scheme and in the related designs of existing brushed motors, most of the corner positions of the four side edges of the motor housing are provided with rounded corners or 45° chamfers. Through the rounded corners or chamfers, they are integrally formed with the straight edges of the four side walls. Although the straight edges can prevent the motor from rolling during placement or transportation, the straight edges will have a certain impact on the strength of the housing, resulting in the housing being prone to cracking during high-intensity use, which affects the service life of the motor.

[0004] In addition, in the above motor, magnetic tiles are generally installed at the four ends inside the housing. The magnetic tiles are permanent magnets. The four magnetic tiles inside the housing will form a magnetic field for the rotor to rotate inside the housing. The housing is used as a stator. However, this setting method will make it difficult to control the size of the stator, with low production efficiency. Since the four magnetic tiles all have certain magnetism, they will interfere with each other during assembly, resulting in a slow assembly speed and poor stability of the magnetic tile installation. Content of the Utility Model

[0005] The utility model overcomes the above deficiencies and provides a technical solution that can solve the above problems.

[0006] A high-strength anti-cracking motor includes an outer shell, a permanent magnet ring, a rotor, and an end cover;

[0007] Rounded corners are formed at the corners of the four side edges of the outer shell. A transition edge is formed between the four side walls of the outer shell and the rounded corners. The transition edge and the side wall of the outer shell form a micro-arc shape;

[0008] The permanent magnet ring is an integral structure. The outer wall of the permanent magnet ring is fixedly installed inside the inner wall of the outer shell through glue. A through hole is formed in the middle of the permanent magnet ring, and the rotor is installed in the through hole with a clearance fit;

[0009] The rotor is rotatably installed between the outer shell and the end cover. The end cover is fixedly installed at the right end of the outer shell, and the end cover covers the middle parts of the permanent magnet ring and the rotor inside the outer shell.

[0010] Further: The rotor includes a rotating shaft, a wire holder, and a commutator. The wire holder and the commutator are both fixedly installed on the rotating shaft. A plurality of wire grooves are formed on the outer periphery of the wire holder. The plurality of wire grooves are arranged in a circular array with each other. A copper wire winding is wound and installed in the wire groove. Both ends of the copper wire winding are electrically connected and welded to the commutator.

[0011] Further: A rolling bearing is sleeved and installed at the left end of the rotating shaft. A bearing groove is formed in the middle of the left end of the housing. The rolling bearing is installed in the bearing groove with a clearance fit.

[0012] Further: A first mounting hole is formed in the middle of the left end of the housing. A second mounting hole is formed in the middle of the right side of the end cover. Both ends of the rotating shaft are rotatably installed in the first mounting hole and the second mounting hole respectively.

[0013] Further: The left end of the rotating shaft extends out of the housing, and the right end of the rotating shaft extends out of the end cover.

[0014] Further: Limiting notches are formed on both the upper and lower sides of the right end of the housing. The widths of the limiting notches on the upper and lower sides are different. Protrusions are formed on both the upper and lower sides of the left end of the end cover. The protrusions are installed in the limiting notches with a one-to-one clearance fit.

[0015] Further: The outer wall of the permanent magnet ring is closely attached to the inner wall of the housing. The distance between the side wall of the permanent magnet ring and the through hole is less than the thickness at the four corner positions of the permanent magnet ring. The four corner positions of the permanent magnet ring are respectively installed at the four corner positions inside the housing.

[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0017] 1. By using the transition edge, the side wall of the housing is formed into an arc-shaped curved surface, which can prevent the motor from rolling and has the characteristics of high strength. With the setting of the rounded corners, it can effectively prevent the housing of the motor from cracking and can meet the high-intensity operation of the motor.

[0018] 2. By using the overall permanent magnet ring installed in the housing, compared with the traditional four magnetic tiles, it has the characteristics of convenient assembly and high stability.

[0019] The additional aspects and advantages of the present utility model will be partially given in the following description, partially will become obvious from the following description, or will be understood through the practice of the present utility model. Description of the Drawings

[0020] 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 also be obtained based on these drawings.

[0021] Figure 1 It is a schematic structural diagram of the present invention.

[0022] Figure 2 It is a schematic structural diagram of another perspective of the present invention.

[0023] Figure 3 It is an exploded structural diagram of the present invention.

[0024] Figure 4 It is an exploded structural diagram of another perspective of the present invention.

[0025] As shown in the figure: 1. Outer shell; 2. Permanent magnet ring; 3. Rotor; 31. Rotating shaft; 32. Wire holder; 321. Wire groove; 33. Commutator; 34. Rolling bearing; 4. End cover; 5. Chamfer; 6. Transition edge; 7. Through hole; 8. Bearing groove; 9. First mounting hole; 10. Second mounting hole; 11. Limit notch; 12. Protrusion. Specific embodiments

[0026] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the drawings. Obviously, the described embodiments are some embodiments of the present invention, rather than all embodiments.

[0027] Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents the selected embodiments of the present invention.

[0028] Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0029] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0030] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0031] As Figures 1-4 shown, a high-strength anti-cracking motor of the present utility model includes a housing 1, a permanent magnet ring 2, a rotor 3, and an end cover 4;

[0032] At the corners of the four side edges of the housing 1, rounded corners 5 are formed. Between the four side walls of the housing 1 and the rounded corners 5, a transition edge 6 is formed, and the transition edge 6 and the side wall of the housing 1 form a micro-arc shape;

[0033] The permanent magnet ring 2 is an integral structure. The outer wall of the permanent magnet ring 2 is fixedly installed in the inner wall of the housing 1 through glue. A through hole 7 is formed in the middle of the permanent magnet ring 2, and the rotor 3 is installed in the through hole 7 with a clearance fit;

[0034] The rotor 3 is rotatably installed between the housing 1 and the end cover 4. The end cover 4 is fixedly installed at the right end of the housing 1, and the end cover 4 covers the middle parts of the permanent magnet ring 2 and the rotor 3 in the housing 1;

[0035] Its principle is: By using the transition edge 6, the side wall of the housing 1 is formed into an arc-shaped surface, which can prevent the motor from rolling and has the characteristics of high strength. With the setting of the rounded corners 5, it can effectively prevent the housing 1 of the motor from cracking and can meet the high-strength operation of the motor; By using the overall permanent magnet ring 2 installed in the housing 1, compared with the traditional four magnetic tiles, it has the characteristics of convenient assembly and high stability.

[0036] Further: The rotor 3 includes a rotating shaft 31, a wire holder 32, and a commutator 33. The wire holder 32 and the commutator 33 are both fixedly installed on the rotating shaft 31. A plurality of wire grooves 321 are formed on the outer periphery of the wire holder 32. The plurality of wire grooves 321 are arranged in a circular array with each other. A copper wire winding is wound and installed in the wire groove 321. The two ends of the copper wire winding are respectively electrically connected and welded to the commutator 33. Similar to the working principle of the existing brushed motor, when it works, power is supplied to the copper wire winding on the wire holder 32 to achieve the high-speed rotation of the rotor 3.

[0037] Further: A rolling bearing 34 is sleeved and installed at the left end of the rotating shaft 31. A bearing groove 8 is formed in the middle of the left end of the outer shell 1. The rolling bearing 34 is installed in the bearing groove 8 with a clearance fit; this can reduce the noise generated when the rotating shaft 31 rotates.

[0038] Further: A first mounting hole 9 is formed in the middle of the left end of the outer shell 1. A second mounting hole 10 is formed in the middle of the right side of the end cover 4. The two ends of the rotating shaft 31 are respectively installed in the first mounting hole 9 and the second mounting hole 10 with a rotational fit; this can ensure the stable rotation of the rotating shaft 31.

[0039] Further: The left end of the rotating shaft 31 extends out of the outer shell 1, and the right end of the rotating shaft 31 extends out of the end cover 4; this enables the rotating shaft 31 of the motor to stably drive other components to rotate, facilitating actual use.

[0040] Further: Limiting notches 11 are formed on both the upper and lower sides of the right end of the outer shell 1. The widths of the limiting notches 11 on the upper and lower sides are different. Protrusions 12 are formed on both the upper and lower sides of the left end of the end cover 4. The protrusions 12 are installed in the limiting notches 11 with a one-to-one clearance fit. This can effectively prevent the end cover 4 from being installed in the wrong direction, thereby achieving rapid assembly production.

[0041] Further: The outer wall of the permanent magnet ring 2 is closely attached to the inner wall of the outer shell 1. The distance between the side wall of the permanent magnet ring 2 and the through hole 7 is less than the thickness at the four end corners of the permanent magnet ring 2. The four end corner positions of the permanent magnet ring 2 are respectively installed at the four end corners inside the outer shell 1; the permanent magnet ring 2 can form S magnetic poles and N magnetic poles at the positions where the four end corners are thicker, enabling the rotor 3 to rotate rapidly after being energized, ensuring the response speed of the motor.

[0042] This embodiment does not impose any formal restrictions on the shape, material, structure, etc. of the present invention. Any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention all belong to the protection scope of the technical solution of the present invention.

Claims

1. A high-strength anti-cracking motor, comprising a housing, a permanent magnet ring, a rotor and an end cover; characterized in that: The corners of the four side edges of the shell are all formed with chamfers, transition edges are formed between the four side walls of the shell and the chamfers, and the transition edges and the side walls of the shell form a slightly arc shape; The permanent magnet ring is an integrated structure, the outer wall of the permanent magnet ring is fixedly installed in the inner wall of the shell by glue, a through hole is formed in the middle of the permanent magnet ring, and the rotor is installed in the through hole with clearance fit; The rotor is rotatably mounted between the housing and the end cover, the end cover is fixedly mounted on the right end of the housing, and the end cover covers the permanent magnet ring and the middle part of the rotor in the housing.

2. A high-strength anti-cracking motor according to claim 1, characterized in that: The rotor includes a rotating shaft, a bobbin and a commutator. The bobbin and the commutator are fixedly mounted on the rotating shaft. A plurality of wire slots are formed on the outer circumference of the bobbin. The plurality of wire slots are arranged in a circular array with each other. Copper wire windings are wound in the wire slots. Both ends of the copper wire windings are electrically connected and welded to the commutator.

3. A high-strength anti-cracking motor according to claim 2, characterized in that: The left end of the rotating shaft is sleeved with a rolling bearing, the middle part of the left end of the shell is formed with a bearing groove, and the rolling bearing is installed in the bearing groove with clearance fit.

4. A high-strength anti-cracking motor according to any one of claims 2 or 3, characterized in that: A first mounting hole is formed in the middle of the left end of the shell, and a second mounting hole is formed in the middle of the right side of the end cover. Both ends of the rotating shaft are rotatably mounted in the first mounting hole and the second mounting hole respectively.

5. The high-strength anti-cracking motor according to claim 2, characterized in that: The left end of the rotating shaft extends out of the housing, and the right end of the rotating shaft extends out of the end cover.

6. The high-strength anti-cracking motor according to claim 1, characterized in that: The upper and lower sides of the right end of the shell are both formed with limiting notches, and the widths of the limiting notches on the upper and lower sides are different. The upper and lower sides of the left end of the end cover are both formed with protrusions, and the protrusions are installed in the limiting notches with one-to-one corresponding clearances.

7. The high-strength anti-cracking motor according to claim 1, characterized in that: The outer wall of the permanent magnet ring is tightly attached to the inner wall of the shell, the distance between the side wall of the permanent magnet ring and the through hole is smaller than the thickness of the four corners of the permanent magnet ring, and the four corners of the permanent magnet ring are respectively installed in the four corners of the shell.

Images