Heat dissipation structure on external rotor motor

Abstract

The utility model relates to the field of motors, in particular to a heat dissipation structure on an external rotor motor, which comprises a stator assembly, an external rotor assembly and a motor end cover with a built-in electric controller element. The outer rotor assembly comprises an outer rotor housing; a plurality of heat dissipation ribs are arranged on the motor end cover; the stator assembly comprises a stator body extending into the outer rotor housing and a flange ring located on the outer side of the outer rotor housing. The motor end cover is fixedly connected to a flange ring of the stator assembly, and a first ventilation opening is formed in the flange ring; a centrifugal wind wheel is fixedly connected to the outer rotor housing below the flange ring; when the outer rotor assembly drives the centrifugal wind wheel to rotate, air is guided to flow through the first ventilation opening from the motor end cover. Compared with an original scheme that radiation heat dissipation is carried out only through the heat dissipation ribs, the centrifugal wind wheel is driven when the outer rotor assembly rotates to form air convection, so that the air circulation speed on the surfaces of the heat dissipation ribs is increased, and the heat dissipation capacity is improved.

Description

Technical Field

[0001] The utility model relates to the field of motors, in particular to a heat dissipation structure on an outer rotor motor. Background Art

[0002] The brushless DC external rotor fan has the advantages of small size and high energy efficiency. In its structure, the motor driver is built into the radiator (end cover) and directly connected to the motor. During operation, the motor driver and stator winding will generate a lot of heat. Under the high protection level requirements, a lot of heat can only be dissipated through air radiation, and the heat dissipation efficiency is extremely low. Due to the limited heat dissipation capacity, the load capacity of the motor is reduced. Summary of the invention

[0003] In order to solve the above problems, the purpose of the utility model is to provide a heat dissipation structure on an outer rotor motor. Compared with the original solution of only radiating heat through heat dissipation ribs, this solution drives the centrifugal fan wheel when the outer rotor assembly rotates to form air convection, thereby enhancing the air circulation speed on the surface of the heat dissipation ribs and improving the heat dissipation capacity.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0005] A heat dissipation structure on an outer rotor motor comprises a stator assembly, an outer rotor assembly, and a motor end cover with an electronic controller element built in; the outer rotor assembly comprises an outer rotor casing, and a plurality of heat dissipation ribs are arranged on the motor end cover; the stator assembly comprises a stator body extending into the interior of the outer rotor casing, and a flange ring located on the outside of the outer rotor casing; the motor end cover is fixedly connected to the flange ring of the stator assembly, and a first vent is constructed on the flange ring; a centrifugal fan wheel is fixedly connected to the outer rotor casing below the flange ring; when the outer rotor assembly drives the centrifugal fan wheel to rotate, air is guided to flow from the motor end cover through the first vent.

[0006] The utility model adopts the above technical solution, which relates to a heat dissipation structure on an outer rotor motor, in which the stator body extends into the interior of the outer rotor housing, and the motor end cover is fixed to the flange ring of the stator assembly. During operation, the outer rotor assembly drives the centrifugal wind wheel to rotate at a high speed relative to the stator assembly and the motor end cover. Furthermore, since a first vent is constructed on the flange ring, air is guided to flow through the first vent from the motor end cover when the centrifugal wind wheel rotates. Since the electronic controller element is built into the motor end cover, the above solution will speed up the air circulation speed around the motor end cover, thereby enhancing the convection effect on the heat dissipation ribs.

[0007] Based on this, compared with the original solution of only radiating heat through heat dissipation ribs, this solution drives the centrifugal wind wheel when the outer rotor assembly rotates to form air convection, thereby enhancing the air circulation speed on the surface of the heat dissipation ribs and improving the heat dissipation capacity.

[0008] In a specific embodiment, the opening edge of the outer rotor housing is provided with a housing rim radially outward, and the housing rim is located on the axial side of the flange ring of the stator assembly; the centrifugal wind wheel is stacked and fixed on the housing rim. In this scheme, the housing rim on the opening edge of the outer rotor housing serves as a mounting base for the centrifugal wind wheel, and the housing rim is located on the axial side of the flange ring. The centrifugal wind wheel is mounted on the housing rim. When the centrifugal wind wheel rotates, air enters axially and exits radially, thereby guiding air from the motor end cover to flow through the first vent.

[0009] In a further embodiment, a second vent is constructed on the motor end cover. When the motor end cover is fixed to the flange ring, the second vent on the motor end cover communicates with the first vent on the flange ring; when the centrifugal wind wheel rotates, the air is guided to flow through the second vent and the first vent in sequence from the motor end cover. In this solution, the second vent is arranged on the motor end cover to correspond to the first vent, so as to avoid the edge of the motor end cover blocking or interfering with the gas flow.

[0010] In a further solution, the plurality of heat dissipation ribs are arranged at least on the circumferential side wall of the motor end cover; the second vent is arranged on the motor end cover below two adjacent heat dissipation ribs, and the outer ends of the two heat dissipation ribs above the second vent are connected by a baffle wall; an air duct is formed between the baffle wall and the two heat dissipation ribs connected thereto. In this solution, an air duct is formed above the second vent between the two heat dissipation ribs and the baffle wall, thereby guiding air to flow through the air duct, thereby increasing the contact time and contact area with the heat dissipation ribs and the baffle wall, and improving the heat dissipation effect.

[0011] Preferably, the centrifugal wind wheel comprises an annular bottom plate, an annular baffle plate constructed on the inner diameter edge of the annular bottom plate, and a plurality of centrifugal blades arranged on the upper end surface of the annular bottom plate outside the annular baffle plate. In the scheme here, an annular baffle plate is arranged on the inner diameter edge of the annular bottom plate, and the centrifugal blades are arranged outside the annular baffle plate, so that the air outlet direction of the centrifugal wind wheel when rotating can be limited. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The present invention is a three-dimensional diagram of an outer rotor motor.

[0013] Figure 2 The exploded diagram of the outer rotor motor involved in the invention.

[0014] Figure 3 This is a cutaway view of the outer rotor assembly involved in the present invention.

[0015] Figure 4 It is a three-dimensional diagram of a centrifugal wind wheel.

[0016] Figure 5 This is a schematic diagram of the end face of the stator assembly.

[0017] Figure 6 This is a schematic diagram of the end face of the motor end cover.

[0018] Figure 7 Schematic diagram of the assembly of the stator assembly and the motor end cover.

[0019] Figure 8 The figure is a schematic diagram of the airflow when the outer rotor motor involved in the present invention is in operation. DETAILED DESCRIPTION

[0020] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0021] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying 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 or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0022] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "plurality" means two or more, unless otherwise clearly defined.

[0023] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like 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 a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0025] like Figures 1 to 8 As shown, this embodiment relates to a heat dissipation structure on an outer rotor motor, including a stator assembly 1, an outer rotor assembly 2, and a motor end cover 3 with an electronic controller element built in. The outer rotor assembly 2 includes an outer rotor housing 21, and a plurality of heat dissipation ribs 31 are arranged on the motor end cover 3. The stator assembly 1 includes a stator body 11 extending into the inner part of the outer rotor housing 21, and a flange ring 12 located outside the outer rotor housing 21. The motor end cover 3 is fixed to the flange ring 12 of the stator assembly 1, and a first vent 13 is constructed on the flange ring 12. A centrifugal fan 4 is fixed to the outer rotor housing 21 below the flange ring 12. When the outer rotor assembly 2 drives the centrifugal fan 4 to rotate, air is guided from the motor end cover 3 to flow through the first vent 13. The stator body 11 in this structure extends into the inner part of the outer rotor housing 21, and the motor end cover 3 is fixed to the flange ring 12 of the stator assembly 1. During operation, the outer rotor assembly 2 drives the centrifugal fan wheel 4 to rotate at a high speed relative to the stator assembly 1 and the motor end cover 3. Furthermore, since the flange ring 12 is provided with a first vent 13, when the centrifugal fan wheel 4 rotates, air will be guided to flow through the first vent 13 from the motor end cover 3. Since the electronic controller components are built into the motor end cover 3, the above scheme will speed up the air circulation speed around the motor end cover 3, and enhance the convection effect on the heat dissipation ribs 31.

[0026] Based on this, compared with the original solution of only radiating heat through the heat dissipation ribs 31, this solution drives the centrifugal wind wheel 4 when the outer rotor assembly 2 rotates to form air convection, thereby enhancing the air circulation speed on the surface of the heat dissipation ribs 31 and improving the heat dissipation capacity.

[0027] like Figure 3 and 4 As shown, the opening edge of the outer rotor housing 21 is radially outwardly provided with a housing rim 22, and the housing rim 22 is located on the axial side of the flange ring 12 of the stator assembly 1. The centrifugal wind wheel 4 is stacked and fixed on the housing rim 22. In the scheme here, the housing rim 22 on the opening edge of the outer rotor housing 21 serves as a mounting base for the centrifugal wind wheel 4, and the housing rim 22 is located on the axial side of the flange ring 12. The centrifugal wind wheel 4 is mounted on the housing rim 22. When the centrifugal wind wheel 4 rotates, the air enters axially and exits radially, thereby guiding the air to flow through the first vent 13 from the motor end cover 3. The centrifugal wind wheel 4 includes an annular bottom plate 41, an annular baffle plate 42 constructed on the inner diameter edge of the annular bottom plate 41, and a plurality of centrifugal blades 43 arranged on the upper end surface of the annular bottom plate 41 outside the annular baffle plate 42. In the scheme here, an annular baffle 42 is arranged on the inner diameter edge of the annular bottom plate 41, and the centrifugal blades 43 are arranged outside the annular baffle 42, so that the air outlet direction of the centrifugal wind wheel 4 when rotating can be limited.

[0028] exist Figure 6 and 7 In the further embodiment shown, a second vent 32 is constructed on the motor end cover 3. When the motor end cover 3 is fixed to the flange ring 12, the second vent 32 on the motor end cover 3 communicates with the first vent 13 on the flange ring 12. When the centrifugal wind wheel 4 rotates, the air is guided to flow through the second vent 32 and the first vent 13 on the motor end cover 3 in sequence. In this scheme, the second vent 32 is arranged on the motor end cover 3 to correspond to the first vent 13, so as to avoid the edge of the motor end cover 3 blocking or interfering with the gas flow. In a further scheme, the plurality of heat dissipation ribs 31 are arranged at least on the circumferential side wall of the motor end cover 3. The second vent 32 is arranged on the motor end cover 3 below two adjacent heat dissipation ribs 31, and the outer ends of the two heat dissipation ribs 31 above the second vent 32 are connected by a baffle 33. An air duct is formed between the baffle 33 and the two heat dissipation ribs 31 connected thereto. In the scheme here, an air duct is formed between two heat dissipation ribs 31 and the baffle wall 33 above the second vent 32, so as to guide the air to flow through the air duct, thereby increasing the contact time and contact area with the heat dissipation ribs 31 and the baffle wall 33, avoiding air flow escape and improving the heat dissipation effect.

[0029] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0030] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention.

Claims

1. A heat dissipation structure for an outer rotor motor, comprising a stator assembly (1), an outer rotor assembly (2), and a motor end cover (3) with an electronic controller component built in; the outer rotor assembly (2) comprises an outer rotor housing (21), and the motor end cover (3) is provided with a plurality of heat dissipation ribs (31); the characteristics are: The stator assembly (1) comprises a stator body (11) extending into the interior of the outer rotor housing (21), and a flange ring (12) located outside the outer rotor housing (21); the motor end cover (3) is fixedly connected to the flange ring (12) of the stator assembly (1), and a first vent (13) is formed on the flange ring (12); a centrifugal fan wheel (4) is fixedly connected to the outer rotor housing (21) below the flange ring (12); when the outer rotor assembly (2) drives the centrifugal fan wheel (4) to rotate, air is guided from the motor end cover (3) to flow through the first vent (13).

2. The heat dissipation structure on an outer rotor motor according to claim 1, characterized in that: The opening edge of the outer rotor casing (21) is provided with a casing rim (22) radially outwardly, and the casing rim (22) is located on one axial side of the flange ring (12) of the stator assembly (1); the centrifugal impeller (4) is stacked and fixedly connected to the casing rim (22).

3. The heat dissipation structure on an outer rotor motor according to claim 1, characterized in that: The motor end cover (3) is provided with a second vent (32); when the motor end cover (3) is fixedly connected to the flange ring (12), the second vent (32) on the motor end cover (3) communicates with the first vent (13) on the flange ring (12); when the centrifugal wind wheel (4) rotates, air is guided from the motor end cover (3) to flow through the second vent (32) and the first vent (13) in sequence.

4. The heat dissipation structure on an outer rotor motor according to claim 3, characterized in that: The plurality of heat dissipation ribs (31) are arranged at least on a circumferential side wall of the motor end cover (3); the second vent (32) is arranged on the motor end cover (3) below two adjacent heat dissipation ribs (31); the outer ends of the two heat dissipation ribs (31) above the second vent (32) are connected via a baffle wall (33); and an air duct is formed between the baffle wall (33) and the two heat dissipation ribs (31) connected thereto.

5. The heat dissipation structure on an outer rotor motor according to claim 2, characterized in that: The centrifugal wind wheel (4) comprises an annular base plate (41), an annular baffle plate (42) constructed on the inner diameter edge of the annular base plate (41), and a plurality of centrifugal blades (43) arranged on the upper end surface of the annular base plate (41) outside the annular baffle plate (42).

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