External rotor motor

Abstract

The utility model relates to an external rotor motor, comprising a rotating shaft which extends along the axial direction; the stator assembly comprises a stator iron core and a stator coil wound on the stator iron core, and the stator iron core is arranged on the rotating shaft in a sleeving manner; the rotor assembly comprises a rotor sleeve and magnetic steel installed on the inner wall of the rotor sleeve, and at least part of the rotor sleeve is arranged on the stator iron core in a sleeving mode; the fan is connected with the rotating shaft and is driven by the rotating shaft to generate heat dissipation airflow; the outer rotor motor further comprises a flow guide piece arranged in a gap between the stator assembly and the rotor assembly, and the heat dissipation airflow makes contact with the flow guide piece so as to move in the direction close to the stator assembly. According to the external rotor motor provided by the utility model, the flow guide member is arranged to limit the circulation direction of the heat dissipation airflow, so that external cold air airflow is directly blown to the stator coil, thereby improving the heat dissipation efficiency of the motor and prolonging the service life of the motor.

Description

Technical Field

[0001] The utility model relates to an outer rotor motor, in particular to an outer rotor motor with high heat dissipation efficiency. Background Art

[0002] When assembling the magnets of the existing outer rotor motor, the magnet bracket is first fixed in the outer rotor sleeve, and then the magnet is fixed between the bosses extending outward from the magnet bracket, and the magnet is close to the inner wall of the outer rotor sleeve. However, the structure of the magnet bracket causes most of the cooling air to flow through the air gap between the stator and the rotor, and the cooling air does not directly act on the heat source, that is, the stator coil, thereby causing the motor temperature to rise.

[0003] In view of this, it is indeed necessary to provide an improved outer rotor motor to overcome the defects of the prior art. Summary of the invention

[0004] In view of the deficiencies in the prior art, the utility model aims to provide an outer rotor motor with high heat dissipation efficiency.

[0005] The utility model solves the technical problems of the prior art by adopting the following technical solutions: an outer rotor motor, comprising: a rotating shaft, the rotating shaft extending in the axial direction; a stator assembly, comprising a stator core and a stator coil wound around the stator core, the stator core being sleeved on the rotating shaft; a rotor assembly, comprising a rotor sleeve and a magnetic steel installed on the inner wall of the rotor sleeve, the rotor sleeve being at least partially sleeved on the stator core; a fan, connected to the rotating shaft and driven by the rotating shaft to generate a heat dissipation airflow; the outer rotor motor also comprises a guide member arranged in a gap between the stator assembly and the rotor assembly, the guide member guiding the heat dissipation airflow to move in a direction close to the stator assembly.

[0006] A further improvement is as follows: the rotor assembly also includes a magnetic steel bracket installed on the inner wall of the rotor sleeve, the magnetic steel bracket includes a plurality of extension portions extending along the axial direction of the rotating shaft, and an accommodating portion is formed between adjacent extension portions and the inner wall of the rotor sleeve, and the magnetic steel portion is accommodated in the accommodating portion.

[0007] A further improved solution is: the guide member is arranged on the extension portion, the guide member is in a semicircular arc shape, and the arc surface is arranged toward the stator assembly.

[0008] A further improved solution is: the guide member includes arcs located on both sides of the arc surface, and the angle between the tangent of the arc and the axial direction of the rotating shaft is less than 90 degrees.

[0009] A further improved solution is: the extension portion extends in the longitudinal direction, the guide member is arranged at a first end of the extension portion in the length direction, and the fan is arranged at a second end of the extension portion in the length direction.

[0010] A further improvement is that the axial length of the extension portion is smaller than the axial length of the magnetic steel and the difference is 2-3 mm.

[0011] A further improvement is as follows: the magnetic steel bracket further includes an annular support portion, and a plurality of extension portions are axially fixed on the annular support portion and are evenly distributed along the circumferential direction.

[0012] A further improved solution is: the fan includes a plurality of blades, and the blades are fixed to the inner wall of the annular support portion.

[0013] A further improved solution is: the flow guide is arranged on the inner wall of the rotor sleeve, and the flow guide is in a semicircular arc shape, and the arc surface is arranged toward the stator assembly.

[0014] A further improved solution is: the guide member includes arcs located on both sides of the arc surface, and the angle between the tangent of the arc and the axial direction of the rotating shaft is less than 90 degrees.

[0015] Compared with the prior art, the utility model has the following beneficial effects: the outer rotor motor further includes a flow guide disposed in the gap between the stator assembly and the rotor assembly, and the heat dissipation airflow contacts the flow guide to move toward the direction close to the stator assembly. By providing the flow guide, the flow direction of the heat dissipation airflow is limited, so that the external cold airflow is directly blown toward the stator coil, thereby improving the heat dissipation efficiency of the motor and extending the service life of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings:

[0017] Figure 1 This is a schematic diagram of the structure of an outer rotor motor of a preferred embodiment of the utility model;

[0018] Figure 2 yes Figure 1 A cross-sectional view of an outer rotor motor is shown;

[0019] Figure 3 yes Figure 1 The schematic diagram of the structure of the rotor sleeve shown;

[0020] Figure 4 yes Figure 3 The structural schematic diagram of the magnetic steel bracket shown;

[0021] Figure 5 yes Figure 1An exploded schematic diagram of an external rotor motor is shown.

[0022] Meaning of the reference numerals in the figures:

[0023] External rotor motor 100 Rotating shaft 1

[0024] Stator assembly 2 Frame 21

[0025] Bearing 22 Stator core 23

[0026] Stator coil 24 Rotor assembly 3

[0027] Magnetic steel 31 Magnetic steel bracket 32

[0028] Extension portion 321 Annular support portion 325

[0029] Accommodation portion 326 Rotor sleeve 34

[0030] Air outlet 35 Fan 4

[0031] Blade 41 Guide 5

[0032] Arc 51 Arc 52 DETAILED DESCRIPTION

[0033] The terms used in the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. For example, the words "upper", "lower", "front", "back", etc., which indicate orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device / element referred to must include a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0034] See also Figures 1 to 5 The figure shows an outer rotor motor 100 according to a preferred embodiment of the utility model, which comprises a rotating shaft 1 extending in the axial direction, a stator assembly 2 and a rotor assembly 3 sleeved on the rotating shaft 1. The stator assembly 2 comprises a frame 21 sleeved on the outer side of the rotating shaft 1 and a bearing 22 located between the rotating shaft 1 and the frame 21, and the frame 21 is axially fixed on the rotating shaft 1 through the bearing 22.

[0035] The stator assembly 2 includes a stator core 23 and a stator coil 24 wound around the stator core 23 . The rotor assembly 3 includes a rotor sleeve 34 . The rotor sleeve 34 is at least partially sleeved on the stator core 23 . The rotating shaft 1 rotates relative to the stator assembly 2 along with the rotor assembly 3 .

[0036] The outer rotor motor 100 further includes a fan 4 connected to the rotating shaft 1, wherein the fan 4 includes a plurality of blades and is driven by the rotating shaft 1 to generate a heat dissipation airflow. The rotor assembly 3 includes a plurality of air outlets 35 penetrating the bottom wall of the rotor sleeve 34, and the heat dissipation airflow flows out from the air outlets 35.

[0037] The rotor assembly 3 includes a magnet 31 installed on the inner wall of the rotor sleeve 34 and a magnet bracket 32 ​​supporting the magnet 31. The magnet bracket 32 ​​is integrally formed with the fan 4, thereby simplifying the assembly steps of the outer rotor motor 100 while ensuring the accuracy of parts assembly, and reducing the weight of the outer rotor motor 100 by reducing the number of parts.

[0038] The magnetic steel bracket 32 ​​includes an annular support portion 325 connected to the blades of the fan 4, and a plurality of extension portions 321 extending axially outward from the annular support portion 325. The plurality of extension portions 321 are evenly distributed on the annular support portion 325 at circumferential intervals. An accommodating portion 326 is formed between adjacent extension portions 321 and the inner wall of the rotor sleeve 34. The magnetic steel 31 is partially accommodated in the accommodating portion 326 until the magnetic steel 31 abuts against the annular support portion 325, thereby preventing the magnetic steel 31 from falling off easily.

[0039] The outer rotor motor 100 also includes a guide member 5 arranged in the gap between the stator assembly 2 and the rotor assembly 3. The heat dissipation airflow contacts the guide member 5 to move toward the direction close to the stator assembly 2, thereby bringing the heat generated by the stator assembly 2 out from the air outlet 35 at the bottom of the rotor sleeve 34, thereby improving the heat dissipation efficiency and extending the service life of the outer rotor motor 100.

[0040] In some embodiments, the extension portion 321 extends in the longitudinal direction, the guide member 5 is disposed at the first end of the extension portion 321 in the longitudinal direction, and the fan 4 is disposed at the second end of the extension portion 321 in the longitudinal direction. When the magnetic steel 31 is assembled into the accommodating portion 326, the axial length of the extension portion 321 is smaller than the axial length of the magnetic steel 31, and the difference is 2-3 mm, or can be infinitely close to ensure a good guide effect.

[0041] The guide member 5 is semicircular in shape, and the arc surface 51 is disposed toward the stator coil 24 . The guide member 5 includes arc lines 52 located on both sides of the arc surface 51 , and the angle between the tangent of the arc line 52 and the axial direction is less than 90 degrees, thereby ensuring that the wind flows through the stator coil 24 and flows out from the air outlet 35 .

[0042] In other embodiments, the flow guide 5 is disposed on the inner wall of the rotor sleeve 34. The flow guide 5 is in a semicircular arc shape, and the arc surface 51 is disposed toward the stator assembly 2. The flow guide 5 also includes arc lines 52 located on both sides of the arc surface 51, and the angle between the tangent of the arc line 52 and the axial direction of the rotating shaft 1 is less than 90 degrees.

[0043] In the present invention, the outer rotor motor 100 further includes a flow guide 5 disposed in the gap between the stator assembly 2 and the rotor assembly 3, and the heat dissipation airflow contacts the flow guide 5 to move toward the direction close to the stator assembly 2. By providing the flow guide 5, the flow direction of the heat dissipation airflow is limited, so that the external cold airflow is directly blown toward the stator coil 24, thereby improving the heat dissipation efficiency of the motor and extending the service life of the motor.

[0044] The utility model is not limited to the above specific implementations. Those skilled in the art can easily understand that there are many alternatives to the outer rotor motor of the utility model without departing from the principle and scope of the utility model. The protection scope of the utility model shall be based on the content of the claims.

Claims

1. An outer rotor motor, comprising: A rotating shaft, the rotating shaft extending in the axial direction; A stator assembly, comprising a stator core and a stator coil wound around the stator core, wherein the stator core is sleeved on the rotating shaft; A rotor assembly, comprising a rotor sleeve and a magnetic steel mounted on an inner wall of the rotor sleeve, wherein the rotor sleeve is at least partially sleeved on the stator core; A fan connected to the rotating shaft and driven by the rotating shaft to generate a heat dissipation airflow; It is characterized in that the outer rotor motor further comprises a flow guide member arranged in a gap between the stator assembly and the rotor assembly, and the flow guide member guides the heat dissipation airflow to move in a direction close to the stator assembly.

2. The outer rotor motor according to claim 1, characterized in that: The rotor assembly also includes a magnetic steel bracket installed on the inner wall of the rotor sleeve, and the magnetic steel bracket includes a plurality of extension portions extending along the axial direction of the rotating shaft. An accommodating portion is formed between adjacent extension portions and the inner wall of the rotor sleeve, and at least a portion of the magnetic steel is accommodated in the accommodating portion.

3. The outer rotor motor according to claim 2, characterized in that: The flow guide is arranged on the extension part, and the flow guide is in a semicircular arc shape, and the arc surface is arranged toward the stator assembly.

4. The outer rotor motor according to claim 3, characterized in that: The flow guide comprises arcs located on both sides of the arc surface, and the angle between the tangent of the arc and the axial direction of the rotating shaft is less than 90 degrees.

5. The outer rotor motor according to claim 3, characterized in that: The extension portion extends in a longitudinal direction, the air guide is arranged at a first end of the extension portion in the longitudinal direction, and the fan is arranged at a second end of the extension portion in the longitudinal direction.

6. The outer rotor motor according to claim 5, characterized in that: The axial length of the extension portion is smaller than the axial length of the magnetic steel and the difference is 2-3 mm.

7. The outer rotor motor according to claim 2, characterized in that: The magnetic steel bracket also includes an annular support portion, and a plurality of extension portions are axially fixed on the annular support portion and are evenly distributed along the circumferential direction.

8. The outer rotor motor according to claim 7, characterized in that: The fan comprises a plurality of blades, and the blades are fixed to the inner wall of the annular support portion.

9. The outer rotor motor according to claim 1, characterized in that: The flow guide is arranged on the inner wall of the rotor sleeve, and the flow guide is in a semicircular arc shape, with the arc surface arranged toward the stator assembly.

10. The outer rotor motor according to claim 9, characterized in that: The flow guide comprises arcs located on both sides of the arc surface, and the angle between the tangent of the arc and the axial direction of the rotating shaft is less than 90 degrees.

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