Outer rotor brushless motor casing strength enhancing structure

Abstract

The utility model relates to the technical field of brushless motors, and discloses an outer rotor brushless motor casing strength enhancing structure, which comprises a motor body, and the motor body comprises a rotor assembly and a stator assembly. The rotor assembly comprises a machine shell, a motor shaft is arranged in the machine shell, a ball bearing is arranged on the motor shaft in a sleeved mode, a plastic check ring is arranged in the machine shell, a magnet is arranged in the machine shell, and an aluminum check ring is arranged at the position of a port of the machine shell. According to the casing strength enhancing structure of the outer rotor brushless motor, the strength of the casing can be effectively enhanced through the structure of adding the aluminum check ring, so that vibration and squeal generated by scraping of the magnet and the stator iron core are eliminated.

Description

Technical Field

[0001] The utility model relates to the technical field of brushless motors, in particular to a casing strength enhancement structure for an outer rotor brushless motor. Background Art

[0002] The type of magnets usually used in high power density outer rotor brushless motors is sintered NdFeB (strong magnets) because the remanent magnetism of sintered NdFeB is strong and, accordingly, the mutual attraction between it and the stator core is large.

[0003] However, due to the strong attraction, when the motor rotor is running, the magnet at the opening of the housing is easy to scrape against the stator core, causing great vibration and "howling" noise. This is not allowed during the operation of the motor.

[0004] Therefore, how to eliminate the vibration and noise caused by strong magnetism and stator iron-stone scraping on a motor with high power density has become a problem. The utility model is based on the above considerations and is used in conventional motors (such as Figure 1 As shown in the figure), add an aluminum retaining ring (as shown in the figure) to the port of the housing. Figure 2 This structure of adding a magnet retaining ring can effectively strengthen the casing, thereby eliminating the vibration and "howling" caused by the scraping between the magnet and the stator core. Utility Model Content

[0005] 1. Technical issues to be solved

[0006] In view of the shortcomings of the prior art, the utility model provides a casing strength enhancement structure for an outer rotor brushless motor, which has the advantages of adding an aluminum retaining ring at the casing port to enhance the casing strength. This structure of adding the aluminum retaining ring can effectively enhance the strength of the casing, thereby eliminating the vibration and "howling" caused by the scratching between the magnet and the stator core.

[0007] (II) Technical solution

[0008] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an outer rotor brushless motor housing strength enhancement structure, comprising a motor body, wherein the motor body comprises: a rotor assembly and a stator assembly;

[0009] The rotor assembly comprises a casing, a motor shaft is arranged inside the casing, a ball bearing is sleeved on the motor shaft, a plastic retaining ring is arranged inside the casing, a magnet is arranged inside the casing, and an aluminum retaining ring is arranged at a port of the casing.

[0010] Preferably, the stator assembly comprises a stator bracket, a control board is mounted on the stator bracket, and a stator core is connected to the stator bracket.

[0011] Preferably, enameled wire is connected to the stator core.

[0012] Preferably, screws are connected to the casing.

[0013] Preferably, a retaining spring groove is provided on the motor shaft, and a retaining spring is installed in the retaining spring groove.

[0014] Preferably, a wave washer is connected to the ball bearing, and the wave washer is adjacent to the retaining spring.

[0015] (III) Beneficial effects

[0016] Compared with the prior art, the utility model provides a casing strength enhancement structure for an outer rotor brushless motor, which has the following beneficial effects:

[0017] The invention discloses a casing strength enhancement structure for an outer rotor brushless motor. By adding an aluminum retaining ring, the strength of the casing can be effectively enhanced, thereby eliminating vibration and "howling" caused by the scraping between a magnet and a stator core. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 It is a schematic diagram of the prior art structure of the motor in the utility model;

[0020] Figure 2 This is a schematic diagram of the improved structure of the utility model;

[0021] Figure 3 This is a schematic diagram of the structure of the aluminum retaining ring in the utility model;

[0022] Figure 4 It is a structural schematic diagram of the rotor assembly in the utility model;

[0023] Figure 5 This is a first structural schematic diagram of a stator assembly in the utility model;

[0024] Figure 6 This is a second structural schematic diagram of the stator assembly in the utility model;

[0025] Figure 7 It is a structural schematic diagram of the motor structure in the utility model.

[0026] In the figure: 01, housing; 02, plastic retaining ring; 03, magnet; 04, aluminum retaining ring; 05, motor shaft; 06, ball bearing; 07, stator bracket; 08, control board; 09, stator core; 10, enameled wire; 11, screw; 12, retaining ring; 13, wave washer. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] Example 1

[0029] like Figure 1-7 As shown, the utility model provides a casing strength enhancement structure of an outer rotor brushless motor, comprising a motor body, the motor body comprising: a rotor assembly and a stator assembly;

[0030] The rotor assembly includes a housing 01, a motor shaft 05 is installed inside the housing 01, a ball bearing 06 is sleeved on the motor shaft 05, a plastic retaining ring 02 is installed inside the housing 01, a magnet 03 is installed inside the housing 01, and an aluminum retaining ring 04 is installed at the port of the housing 01.

[0031] The stator assembly includes a stator bracket 07 , on which a control board 08 is mounted, and on which a stator core 09 is connected.

[0032] The stator core 09 is connected to an enameled wire 10 .

[0033] The housing 01 is connected with screws 11 .

[0034] A retaining ring groove is provided on the motor shaft 05, and a retaining ring 12 is installed in the retaining ring groove.

[0035] The ball bearing 06 is connected with a wave washer 13 , and the wave washer 13 is adjacent to the retaining spring 12 .

[0036] The working principle of the outer rotor brushless motor casing strength enhancement structure is described in detail below.

[0037] like Figure 1-7 As shown, when this DC brushless external rotor motor is in use, the control board 08 is connected to an external power supply. After power is turned on, the circuit of the control board 08 determines the rotor position based on the Hall signal, thereby giving different currents to the armature windings wound around the stator core 09, so that each phase winding is turned on in a certain time sequence, and the rotor assembly is rotated through electronic commutation.

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An outer rotor brushless motor housing strength enhancement structure, comprising a motor body, characterized in that: The motor body comprises: a rotor assembly and a stator assembly; The rotor assembly comprises a casing (01), a motor shaft (05) is installed inside the casing (01), a ball bearing (06) is sleeved on the motor shaft (05), a plastic retaining ring (02) is installed inside the casing (01), a magnet (03) is installed inside the casing (01), and an aluminum retaining ring (04) is installed at the port of the casing (01).

2. The outer rotor brushless motor housing strength enhancement structure according to claim 1, characterized in that: The stator assembly comprises a stator bracket (07), a control panel (08) is mounted on the stator bracket (07), and a stator core (09) is connected to the stator bracket (07).

3. The outer rotor brushless motor housing strength enhancement structure according to claim 2, characterized in that: The stator core (09) is connected to an enameled wire (10).

4. The outer rotor brushless motor casing strength enhancement structure according to claim 1, characterized in that: The housing (01) is connected with screws (11).

5. The outer rotor brushless motor casing strength enhancement structure according to claim 1, characterized in that: The motor shaft (05) is provided with a retaining spring groove, in which a retaining spring (12) is installed.

6. The outer rotor brushless motor housing strength enhancement structure according to claim 1, characterized in that: The ball bearing (06) is connected to a wave pad (13), and the wave pad (13) is adjacent to the retaining spring (12).

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