Outer rotor motor

Abstract

The utility model relates to the technical field of motors, and provides an external rotor motor, which comprises a stator assembly, a rotor assembly, a circuit board, a bearing sleeve, a first bearing and a second bearing, the stator assembly comprises a stator core and a coil; the rotor assembly comprises a rotating shaft, a rotor magnet and a rotor magnet holder. The bearing sleeve is provided with a base part and a cylindrical part which are integrally arranged; a circle of first step part is arranged on the inner circumference of the cylindrical part; the first step part is used for mounting a first bearing; the upper end of the cylindrical part is lower than the upper end of the first bearing; a circle of second step part is arranged on the inner circumference of the base part; the second step part is used for mounting a second bearing; and a gap is reserved between the bottom end of the base part and the second bearing. According to the bearing sleeve, glue coating of the bearing sleeve can be facilitated, bearing installation becomes easy, badness is reduced, and the bonding strength of the bearing and the bearing sleeve is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to an outer rotor motor. Background Art

[0002] The rotating shaft of the motor structure is installed on the bearing sleeve through the bearing. During the motor production process, glue needs to be applied to the bearing sleeve first, and then the bearing is installed.

[0003] Since the matching tolerance between the existing motor structure bearing and the bearing sleeve is very small, the coating amount of glue is required to be very high. At the same time, it must be evenly coated around the bearing mounting part of the bearing sleeve, which places extremely high requirements on the coating equipment.

[0004] With the current motor structure, the amount of glue applied can only be set according to the gap between the bearing and the bearing sleeve. The amount of glue applied is relatively limited, resulting in very little glue between the bearing and the bearing sleeve, which will cause insufficient bonding strength between the bearing and the bearing sleeve. In addition, when installing the bearing, the bearing will push the glue into the bottom of the bearing mounting portion of the bearing sleeve, which may cause the risk of glue invading the bearing and cause abnormal noise from the bearing. Utility Model Content

[0005] The utility model mainly solves the technical problem that the amount of glue coating between the bearing and the bearing sleeve of the current motor structure is relatively limited, which leads to insufficient bonding strength between the bearing and the bearing sleeve and the risk of glue invading the bearing. An outer rotor motor is proposed to facilitate the glue coating of the bearing sleeve, making the bearing installation easier to operate, reducing defects and improving the bonding strength between the bearing and the bearing sleeve.

[0006] The utility model provides an outer rotor motor, comprising: a stator assembly, a rotor assembly, a circuit board, a bearing sleeve, a first bearing and a second bearing;

[0007] The stator assembly includes a stator core and a coil;

[0008] The rotor assembly includes a rotating shaft, a rotor magnet and a rotor magnet holder;

[0009] The bearing sleeve has a base portion and a cylindrical portion which are integrally arranged;

[0010] The inner circumference of the cylindrical portion has a circle of first step portions; the first step portion is used to install the first bearing; the upper end of the cylindrical portion is lower than the upper end of the first bearing;

[0011] The inner circumference of the base portion has a circle of second step portions; the second step portions are used to install the second bearing; and a gap is left between the bottom end of the base portion and the second bearing.

[0012] Preferably, a stator core is installed on the outer periphery of the cylindrical portion, and the upper end of the cylindrical portion is lower than the upper end of the stator core.

[0013] Preferably, a plurality of arc-shaped buckles for mounting a circuit board are evenly arranged on the base portion.

[0014] Preferably, electronic components are arranged on the lower surface of the circuit board.

[0015] Preferably, the radius of the second bearing is greater than the radius of the first bearing.

[0016] Preferably, the first bearing and the second bearing are ball bearings.

[0017] The utility model provides an outer rotor motor, in which structures are arranged on both sides of the end surface of the bearing sleeve to facilitate the inflow of glue. After gluing, the glue can more easily flow into the components along the gaps between the components, thereby improving the problems of difficult gluing and frequent defects in the existing outer rotor motor structure, facilitating the glue coating of the bearing sleeve, making the bearing installation easier to operate and reducing defects; at the same time, it can improve the bonding strength between the bearing and the bearing sleeve and improve the motor performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the outer rotor motor provided by the utility model;

[0019] Figure 2 It is a schematic diagram of the internal structure of the outer rotor motor provided by the utility model;

[0020] Figure 3 It is an axial cross-sectional view of the outer rotor motor provided by the utility model;

[0021] Figure 4 This is a schematic diagram of the structure of the bearing sleeve provided by the utility model. Figure 1 ;

[0022] Figure 5 This is a schematic diagram of the structure of the bearing sleeve provided by the utility model. Figure 2 .

[0023] Figure numerals: 1. bearing sleeve; 2. circuit board; 3. stator core; 4. coil; 5. rotating shaft; 6. rotor magnet; 7. first bearing; 8. second bearing; 9. rotor magnet retaining frame; 10. electronic component; 101. base portion; 102. cylindrical portion; 103. first step portion; 104. second step portion; 105. arc-shaped buckle. DETAILED DESCRIPTION

[0024] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for the sake of ease of description, only the parts related to the present invention are shown in the accompanying drawings, rather than all of the contents.

[0025] like Figure 1-3 As shown, the outer rotor motor provided by the embodiment of the utility model includes: a stator assembly, a rotor assembly, a circuit board 2, a bearing sleeve 1, a first bearing 7 and a second bearing 8.

[0026] The stator assembly includes a stator core 3 and a coil 4. The stator core 3 has a plurality of radially distributed coil winding parts, and the coil 4 is wound on the coil winding parts.

[0027] The rotor assembly includes a rotating shaft 5, a rotor magnet 6 and a rotor magnet holder 9. The rotor magnet 6 is mounted on the inner circumference of the rotor magnet holder 9, and the rotating shaft 5 is mounted axially on the magnet holder 9. The rotating shaft 5 rotates, which can drive the magnet holder 9 and the rotor magnet 6 to rotate.

[0028] The bearing sleeve 1 is installed on the outer periphery of the rotating shaft 5 and does not contact the rotating shaft 5; the top end of the bearing sleeve 1 extends into the stator core 3. Figure 4-5 As shown, the bearing sleeve 1 has a base portion 101 and a cylindrical portion 102 that are integrally arranged; the inner circumference of the cylindrical portion 102 has a circle of first step portions 103; the first step portion 103 is used to install the first bearing 7; the upper end of the cylindrical portion 102 is lower than the upper end of the first bearing 7; the stator core 3 is installed on the outer circumference of the cylindrical portion 102, and the upper end of the cylindrical portion 102 is also lower than the upper end of the stator core 3. In this way, a groove ( Figure 3 At point a in the middle, apply glue in a circle at this groove position, and the glue will flow along the gap between the first bearing 7 and the cylindrical portion 102 of the bearing sleeve 1, and the gap between the cylindrical portion 102 of the bearing sleeve 1 and the stator core 3, making it convenient to apply glue.

[0029] The inner circumference of the base portion 101 has a circle of second step portions 104; the second step portion 104 is used to install the second bearing 8; there is a gap ( Figure 3 When applying glue, the glue will flow into the gap between the bottom end of the base portion 101 and the second bearing 8, making it easier to apply glue.

[0030] The utility model sets a structure on both sides of the end face of the bearing sleeve to facilitate the inflow of glue. After the glue is applied, the glue can more easily flow into the components along the gaps between the components, which can improve the bonding strength between the bearing and the bearing sleeve and improve the motor performance. The first bearing 7 and the second bearing 8 use ball bearings. The utility model can prevent glue from flowing into the balls and affecting the operation of the bearings. The end where the second bearing 8 is located is the output end. The radius of the second bearing 8 is greater than the radius of the first bearing 7, so that the torque at the output end is greater.

[0031] In addition, a plurality of arc-shaped buckles 105 for mounting the circuit board 2 are evenly arranged on the base portion 101, so as to facilitate fixing the circuit board 2. The electronic components 10 are arranged on the lower surface of the circuit board 2, so as to save space inside the motor.

[0032] The outer rotor motor provided by the utility model is provided with structures for facilitating the inflow of glue on both sides of the end surface of the bearing sleeve. After gluing, the glue can more easily flow into the components along the gaps between the components, thereby improving the problems of difficult gluing operation and frequent defects in the existing outer rotor motor structure, making the bearing installation easier to operate and reducing defects; at the same time, it can improve the bonding strength between the bearing and the bearing sleeve and improve the motor performance.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that modifying the technical solutions recorded in the aforementioned embodiments, or replacing part or all of the technical features therein by equivalents, does not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. An outer rotor motor, comprising: A stator assembly, a rotor assembly, a circuit board (2), a bearing sleeve (1), a first bearing (7) and a second bearing (8); The stator assembly comprises a stator core (3) and a coil (4); The rotor assembly comprises a rotating shaft (5), a rotor magnet (6) and a rotor magnet holder (9); Features: The bearing sleeve (1) comprises a base portion (101) and a cylindrical portion (102) which are integrally arranged; The inner circumference of the cylindrical portion (102) has a circle of first step portion (103); the first step portion (103) is used to install the first bearing (7); the upper end of the cylindrical portion (102) is lower than the upper end of the first bearing (7); The inner circumference of the base portion (101) has a circle of second step portions (104); the second step portions (104) are used to install the second bearing (8); and a gap is left between the bottom end of the base portion (101) and the second bearing (8).

2. The outer rotor motor according to claim 1, characterized in that: The stator core (3) is mounted on the outer periphery of the cylindrical portion (102), and the upper end of the cylindrical portion (102) is lower than the upper end of the stator core (3).

3. The outer rotor motor according to claim 1, characterized in that: A plurality of arc-shaped buckles (105) for mounting the circuit board (2) are evenly arranged on the base portion (101).

4. The outer rotor motor according to claim 1 or 3, characterized in that: An electronic component (10) is arranged on the lower surface of the circuit board (2).

5. The outer rotor motor according to claim 1, characterized in that: The radius of the second bearing (8) is greater than the radius of the first bearing (7).

6. The outer rotor motor according to claim 1 or 5, characterized in that: The first bearing (7) and the second bearing (8) are ball bearings.

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