External rotor motor

Abstract

The utility model provides an external rotor motor, and belongs to the technical field of motors. The technical problems that an existing motor is large in size, low in power, poor in heat dissipation effect and the like are solved. An inner stator in the outer rotor motor comprises a magnet yoke part and a plurality of pole columns, each pole column is wound with a metal coil, an outer rotor comprises a rotor body, an installation part and permanent magnets, the magnetisms of the inner side faces of every two adjacent permanent magnets are opposite, a fan is fixedly connected with a rotating shaft and located on the right side of a right end cover, and the outer side of the fan is sleeved with a fan cover. And the fan cover is fixedly connected with the shell. The fan is arranged on the right side of the right end cover, so that the flow speed of air on the outer side face of the shell is higher, air in the shell can be sucked, and a good heat dissipation effect is achieved; according to the outer rotor motor, the outer rotor formed by the permanent magnet blocks is matched with the inner stator formed by winding the metal coil, so that the motor has higher power under the condition of smaller volume.

Description

Technical Field

[0001] The utility model belongs to the technical field of motors, and particularly refers to an outer rotor motor. Background Art

[0002] A motor (commonly known as a "motor") is an electromagnetic device that realizes the conversion or transmission of electrical energy based on the law of electromagnetic induction.

[0003] At present, the existing motors on the market generally include components such as a rotor, a stator, a housing, and a rotating shaft. Among them, both the rotor and the stator are composed of coils, which have problems such as large volume, low power, and poor heat dissipation effect.

[0004] How to provide a motor with a small volume, high power, and good heat dissipation effect has become an urgent technical problem to be solved. Summary of the Invention

[0005] Aiming at the deficiencies of the existing technology, the purpose of the utility model is to provide an outer rotor motor with a small volume, high power, and good heat dissipation effect.

[0006] The purpose of the utility model can be realized by the following technical solutions:

[0007] An outer rotor motor includes a housing, an inner stator, an outer rotor, a rotating shaft, a wind cover, a fan, and a control box. Left end covers and right end covers are respectively arranged at both ends of the housing. The rotating shaft sequentially passes through the left end cover, the housing, and the right end cover, and the rotating shaft is rotatably connected to the left end cover and the right end cover respectively. It is characterized in that: the inner stator is fixedly connected to the right end cover. The inner stator includes a yoke portion and a plurality of pole columns. The pole columns are arranged at intervals along the outer peripheral surface of the yoke portion. A metal coil is wound on each pole column. The outer rotor includes a disc-shaped rotor body, an annular mounting portion, and permanent magnetic blocks arranged at intervals along the inner peripheral surface of the mounting portion. The rotor body is fixedly connected to the rotating shaft. The mounting portion is sleeved outside the inner stator. The magnetic poles of the permanent magnetic blocks are distributed along the radial direction of the outer rotor. The inner side surfaces of two adjacent permanent magnetic blocks have opposite magnetic properties. The control box can control the current direction in each metal coil. The fan is fixedly connected to the rotating shaft and is located on the right side of the right end cover. A wind cover is sleeved outside the fan, and the wind cover is fixedly connected to the housing.

[0008] In this outer rotor motor, by arranging a fan on the right side of the right end cover, the air flow rate on the outer side surface of the housing is faster, and the air inside the housing will also be sucked over, thereby achieving a better heat dissipation effect. This outer rotor motor adopts the cooperation of an outer rotor composed of permanent magnetic blocks and an inner stator formed by winding metal coils, which can enable the motor to have a larger power under a smaller volume.

[0009] In the above-mentioned outer rotor motor, the number of pole columns is greater than the number of permanent magnetic blocks.

[0010] The limitation of the number of the above-mentioned pole columns and permanent magnetic blocks can ensure that the metal coils wound on the pole columns can smoothly drive the permanent magnetic blocks to rotate.

[0011] In one of the above-mentioned outer-rotor motors, a plurality of axial first heat dissipation fins are arranged at intervals along the circumferential direction on the outer side surface of the housing. A plurality of ventilation holes are provided on the right end cover and the right side wall of the wind cover. A wire passing hole for the connection wire of the metal coil is provided on the right end cover, and the inner diameter of the wind cover is larger than the outer diameter of the housing.

[0012] In one of the above-mentioned outer-rotor motors, the fan includes a disc-shaped fan main body and a plurality of fan blades. A plurality of through holes are provided in the middle of the fan main body. The left ends of the fan blades are fixedly connected to the fan main body, and the fan blades are arranged in an annular array centered on the central axis of the fan main body.

[0013] The working principle of the fan in the present outer-rotor motor is as follows: When the fan rotates, the fan blades will beat the air and make the air move outward along the circumferential direction. At this time, a negative pressure will be formed in the middle of the fan, and the outside air will enter the middle area of the fan through the ventilation holes on the wind cover. The air in the motor housing will also enter the middle area of the fan through the ventilation holes on the right end cover. The air discharged outward along the circumferential direction by the fan will impact on the inner wall of the wind cover and then move leftward under the guidance of the wind cover and blow onto the first heat dissipation fins on the outer side wall of the housing, accelerating the air flow rate on the outer side wall of the housing, thereby playing a role in improving the heat dissipation effect of the housing.

[0014] In one of the above-mentioned outer-rotor motors, the control box is installed on the upper side of the housing. A plurality of second heat dissipation fins parallel to the axial direction of the housing are arranged at intervals on the lower side surface of the control box. An upwardly protruding air guiding cavity is formed in the upper part of the air guiding cover. The upper edge of the air guiding cavity is higher than the upper edge of the second heat dissipation fins, and the left end of the air guiding cavity is open.

[0015] The cooperation of the above-mentioned air guiding cavity and the second heat dissipation fins enables the fan to dissipate heat from the housing and the control box at the same time.

[0016] In one of the above-mentioned outer-rotor motors, the rotating shaft, the inner stator, the outer rotor and the fan are all coaxially arranged.

[0017] The coaxial arrangement of the above-mentioned components can make the present outer-rotor motor work more stably.

[0018] Compared with the prior art, the technical effect of the present utility model is:

[0019] The utility model arranges a fan on the right side of the right end cover, so that the air flow velocity on the outer side surface of the housing is faster, and the air in the housing will also be sucked over, thereby achieving a better heat dissipation effect; this outer rotor motor adopts the cooperation of an outer rotor composed of permanent magnetic blocks and an inner stator formed by winding metal coils, and can make the motor have a larger power under a smaller volume. Brief Description of the Drawings

[0020] Figure 1 is a schematic diagram of the overall structure of the utility model.

[0021] Figure 2 is an exploded structure schematic diagram of the utility model.

[0022] Figure 3 is a cross-sectional view of the exploded state of the utility model.

[0023] Figure 4 is a schematic diagram of the connection structure of the stator core, right end cover and fan of the utility model.

[0024] Figure 5 is a schematic diagram of the structure of the outer rotor of the utility model.

[0025] Figure 6 is a schematic diagram of the structure of the right end cover of the utility model.

[0026] Figure 7 is a schematic diagram of the structure of the wind shield of the utility model.

[0027] Figure 8 is a schematic diagram of the structure of the fan of the utility model.

[0028] In the figure, 1. housing; 11. first heat dissipation fin; 2. inner stator; 21. yoke part; 22. pole column; 3. outer rotor; 31. rotor main body; 32. mounting part; 33. permanent magnetic block; 4. rotating shaft; 5. wind shield; 51. air guiding cavity; 6. fan; 61. fan main body; 611. through hole; 62. fan blade; 7. control box; 71. second heat dissipation fin; 8. left end cover; 9. right end cover; 91. wire passing hole; 10. ventilation hole. Detailed Embodiment

[0029] The following are specific embodiments of the utility model and in combination with the drawings, the technical solutions of the utility model are further described, but the utility model is not limited to these embodiments.

[0030] This outer-rotor 3 motor includes a housing 1, an inner stator 2, an outer rotor 3, a rotating shaft 4, a wind cover 5, a fan 6, and a control box 7. Left end cover 8 and right end cover 9 are respectively provided at both ends of the housing 1. The rotating shaft 4 passes through the left end cover 8, the housing 1, and the right end cover 9 in sequence. The rotating shaft 4 is rotatably connected to the left end cover 8 and the right end cover 9 respectively. The inner stator 2 is fixedly connected to the right end cover 9. The inner stator 2 includes a yoke portion 21 and a plurality of pole columns 22. The pole columns 22 are arranged at intervals along the outer peripheral surface of the yoke portion 21. A metal coil is wound around each pole column 22. The outer rotor 3 includes a disc-shaped rotor main body 31, an annular mounting portion 32, and permanent magnet blocks 33 arranged at intervals along the inner peripheral surface of the mounting portion 32. The rotor main body 31 is fixedly connected to the rotating shaft 4. The mounting portion 32 is sleeved outside the inner stator 2. The magnetic poles of the permanent magnet blocks 33 are distributed along the radial direction of the outer rotor 3. The inner side surfaces of two adjacent permanent magnet blocks 33 have opposite magnetic properties. The control box 7 can control the current direction in each metal coil. The fan 6 is fixedly connected to the rotating shaft 4 and is located on the right side of the right end cover 9. A wind cover 5 is sleeved outside the fan 6. The wind cover 5 is fixedly connected to the housing 1. In this outer-rotor 3 motor, by arranging the fan 6 on the right side of the right end cover 9, the air flow velocity on the outer side surface of the housing 1 is faster, and the air inside the housing 1 will also be sucked over, thus achieving a better heat dissipation effect. This outer-rotor 3 motor adopts the cooperation of the outer rotor 3 composed of permanent magnet blocks 33 and the inner stator 2 formed by winding metal coils, enabling the motor to have a greater power in a smaller volume.

[0031] As Figure 4 shown, the number of pole columns 22 is greater than the number of permanent magnet blocks 33. The limitation of the number of the above-mentioned pole columns 22 and permanent magnet blocks 33 can ensure that the metal coils wound around the pole columns 22 can smoothly drive the permanent magnet blocks 33 to rotate.

[0032] As Figures 1-8As shown in the figure, several axial first heat dissipation fins 11 are arranged at intervals along the circumferential direction on the outer side surface of the housing 1. A plurality of ventilation holes 10 are provided on the right end cover 9 and the right side wall of the wind cover 5. A wire passing hole 91 for the connection wire of the metal coil to pass through is provided on the right end cover 9. The inner diameter of the wind cover 5 is larger than the outer diameter of the housing 1; the fan 6 includes a disc-shaped fan body 61 and several fan blades 62. Several through holes 611 are provided in the middle of the fan body 61. The left end of the fan blade 62 is fixedly connected to the fan body 61. The fan blades 62 are arranged in a circular array centered on the central axis of the fan body 61. The working principle of the fan 6 in this outer rotor 3 motor is as follows: When the fan 6 rotates, the fan blades 62 will beat the air and make the air move outward along the circumferential direction. At this time, a negative pressure will be formed in the middle of the fan 6. The outside air will enter the middle area of the fan 6 through the ventilation holes 10 on the wind cover 5. The air in the motor housing 1 will also enter the middle area of the fan 6 through the ventilation holes 10 on the right end cover 9. The air discharged outward along the circumferential direction by the fan 6 will hit the inner wall of the wind cover 5 and then move leftward under the guidance of the wind cover 5 and blow onto the first heat dissipation fins 11 on the outer side wall of the housing 1, accelerating the air flow rate on the outer side wall of the housing 1, thereby playing a role in improving the heat dissipation effect of the housing 1.

[0033] Furthermore, the control box 7 is installed on the upper side of the housing 1. Several second heat dissipation fins 71 parallel to the axis of the housing 1 are arranged at intervals on the lower side surface of the control box 7. The upper part of the wind guiding cover 5 is formed with an upwardly protruding wind guiding cavity 51. The upper edge of the wind guiding cavity 51 is higher than the upper edge of the second heat dissipation fins 71. The left end of the wind guiding cavity 51 is open. The cooperation of the above-mentioned wind guiding cavity 51 and the second heat dissipation fins 71 enables the fan 6 to dissipate heat from the housing 1 and also from the control box 7.

[0034] The rotating shaft 4, the inner stator 2, the outer rotor 3 and the fan 6 are all coaxially arranged. The coaxial arrangement of the above components can make the outer rotor 3 motor work more stably.

[0035] The above embodiments are only the preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape and principle of the present invention should be covered within the protection scope defined by the claims of the present invention.

Claims

1. An external rotor motor, comprising a housing (1), an inner stator (2), an external rotor (3), a rotating shaft (4), a wind hood (5), a fan (6) and a control box (7). Left end covers (8) and right end covers (9) are respectively arranged at two ends of the housing (1). The rotating shaft (4) sequentially passes through the left end cover (8), the housing (1) and the right end cover (9), and the rotating shaft (4) is rotatably connected to the left end cover (8) and the right end cover (9) respectively. It is characterized in that: The inner stator (2) is fixedly connected to the right end cover (9). The inner stator (2) includes a yoke portion (21) and a plurality of pole columns (22). The pole columns (22) are arranged at intervals along the outer peripheral surface of the yoke portion (21). A metal coil is wound around each pole column (22). The outer rotor (3) includes a disc-shaped rotor body (31), an annular mounting portion (32), and permanent magnet blocks (33) arranged at intervals along the inner peripheral surface of the mounting portion (32). The rotor body (31) is fixedly connected to the rotating shaft (4). The mounting portion (32) is sleeved outside the inner stator (2). The magnetic poles of the permanent magnet blocks (33) are distributed radially along the outer rotor (3). The inner side surfaces of two adjacent permanent magnet blocks (33) have opposite magnetic polarities. The control box (7) can control the current direction in each metal coil. The fan (6) is fixedly connected to the rotating shaft (4) and is located on the right side of the right end cover (9). A wind cover (5) is sleeved outside the fan (6). The wind cover (5) is fixedly connected to the housing (1).

2. The external rotor motor according to claim 1, characterized in that: The number of the pole columns (22) is greater than the number of the permanent magnet blocks (33).

3. The external rotor motor according to claim 1, wherein: A plurality of axial first heat dissipation fins (11) are arranged at intervals along the circumferential direction on the outer side surface of the housing (1). A plurality of ventilation holes (10) are provided on the right side walls of the right end cover (9) and the wind cover (5). A wire passing hole (91) for the connection wire of the metal coil to pass through is provided on the right end cover (9). The inner diameter of the wind cover (5) is greater than the outer diameter of the housing (1).

4. The external rotor motor according to claim 3, wherein: The fan (6) includes a disc-shaped fan body (61) and a plurality of fan blades (62). A plurality of through holes (611) are provided in the middle of the fan body (61). The left ends of the fan blades (62) are fixedly connected to the fan body (61). The fan blades (62) are arranged in an annular array centered on the central axis of the fan body (61).

5. The external rotor motor according to claim 3, characterized in that: The control box (7) is installed on the upper side of the housing (1). A plurality of second heat dissipation fins (71) parallel to the axis of the housing (1) are arranged at intervals on the lower side surface of the control box (7). An air guiding cavity (51) protruding upward is formed on the upper part of the wind cover (5). The upper edge of the air guiding cavity (51) is higher than the upper edge of the second heat dissipation fins (71). The left end of the air guiding cavity (51) is open.

6. An external rotor motor according to any one of claims 1-5, characterized in that: The rotating shaft (4), the inner stator (2), the outer rotor (3), and the fan (6) are all coaxially arranged.

Images