Direct-current brushless permanent magnet synchronous outer rotor motor for industrial ceiling fan

Abstract

The utility model discloses a DC brushless permanent magnet synchronous external rotor motor used for an industrial ceiling fan, comprising an external rotor, an upper cover, a lower cover, a central shaft, a stator and an external driver, the periphery of the upper cover is provided with at least three groups of first connecting plates used for connecting fan blades, and the stator is installed in an internal cavity formed by the external rotor, the upper cover and the lower cover. The center shaft sequentially penetrates through center holes of the upper cover, the stator and the lower cover, and the upper cover, the lower cover, the first deep groove ball bearing and the second deep groove ball bearing form rotary dynamic sealing through framework oil seals. The stator comprises an iron core and a coil wound in the iron core, and a plurality of pieces of magnetic steel are adhered to the inner wall of the outer rotor at equal intervals. The magnetic steel is adopted to replace a rotor winding, excitation current is not needed, the loss of the motor is reduced, the efficiency of the motor is greatly improved, the speed regulation range is wide, a speed reduction device can be omitted, motor elements are reduced, and the manufacturing cost of the motor is saved. Meanwhile, the overall size and weight of the industrial ceiling fan are reduced, and installation is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a brushless DC permanent magnet synchronous outer rotor motor for an industrial ceiling fan. Background Art

[0002] Industrial ceiling fans generate a large area of ​​simulated natural wind system, accelerate air circulation in large spaces, improve the working environment of personnel, improve work efficiency, and solve the problem of ventilation and cooling in large spaces. The general industrial ceiling fan outer rotor motor mostly adopts asynchronous motor mode, and the rotor winding requires excitation current to start, which not only increases the size of the motor, but also increases the motor loss, resulting in low motor efficiency. In addition, the speed regulation performance of the asynchronous motor is poor, and a reduction device is required to meet general use requirements. In addition, the motor of this type of ceiling fan is usually heavy overall, which makes it difficult to install and difficult to install the structure. Utility Model Content

[0003] In order to solve the technical problems mentioned in the background technology, the utility model provides a brushless DC permanent magnet synchronous outer rotor motor for an industrial ceiling fan.

[0004] The utility model adopts the following technical scheme: a DC brushless permanent magnet synchronous outer rotor motor for an industrial ceiling fan, comprising an outer rotor, an upper cover, a lower cover, a central shaft, a stator and an external driver; at least three groups of first connecting plates for connecting fan blades are provided on the outer periphery of the upper cover; a plurality of bolt holes are provided on the first connecting plate; the bottom of the upper cover is fixedly connected to the upper end of the outer rotor; the top of the lower cover is fixedly connected to the lower end of the outer rotor; the stator is installed in an internal cavity formed by the outer rotor, the upper cover and the lower cover; the central shaft passes through the central holes of the upper cover, the stator and the lower cover in sequence; and the central shaft is rotatably connected to the upper cover and the lower cover respectively through a first deep groove ball bearing and a second deep groove ball bearing; the upper cover, the lower cover and the first deep groove ball bearing are connected to the lower cover; A rotating dynamic seal is formed between the groove ball bearing and the second deep groove ball bearing through a skeleton oil seal; the stator includes an iron core and a coil wound inside the iron core; a plurality of magnets are pasted on the inner wall of the outer rotor at equal intervals; the plurality of magnets are arranged around the iron core; the plurality of magnets interact with the magnetic field generated when the outer ring of the stator rotates to generate a torque to drive the outer rotor to rotate; the external driver is arranged on the outside of the iron core, and one end of the connecting line of the external driver passes through the central axis and is electrically connected to the iron core; the outer rotor includes a cylindrical shell that passes through from top to bottom; a second connecting plate for connecting with the first connecting plate is arranged around the top of the shell; and a plurality of bolt holes for fixing the fan blades are arranged on the second connecting plate.

[0005] Furthermore, the gap between the iron core of the stator and the corresponding magnetic steel is in the range of 0.5-1 mm.

[0006] Furthermore, the upper cover and the lower cover are fixedly connected to the housing of the outer rotor via a plurality of fixing bolts and self-locking nuts.

[0007] Furthermore, a label is attached to the bottom of the lower cover.

[0008] Compared with the prior art, the utility model has the following advantages: the brushless DC permanent magnet synchronous outer rotor motor for industrial ceiling fans designed by the utility model adopts magnetic steel instead of rotor winding, does not require excitation current, reduces motor loss, greatly improves motor efficiency, and has a wide speed regulation range, can omit the reduction device, reduces motor components, and saves motor manufacturing costs. At the same time, the overall volume and weight of the industrial ceiling fan are reduced, making it easy to install. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the exploded structure of a brushless DC permanent magnet synchronous outer rotor motor for an industrial ceiling fan of the utility model;

[0010] Figure 2 The utility model is a cross-sectional structural schematic diagram of a brushless DC permanent magnet synchronous outer rotor motor for an industrial ceiling fan.

[0011] in:

[0012] 1-outer rotor, 2-upper cover, 3-lower cover, 4-center shaft, 5-stator, 6-external driver, 7-first deep groove ball bearing, 8-second deep groove ball bearing, 9-skeleton oil seal,

[0013] 11-magnetic steel, 12-housing, 13-second connecting plate,

[0014] 21- first connecting plate,

[0015] 51- iron core, 52- coil. DETAILED DESCRIPTION

[0016] In order to facilitate those skilled in the art to understand the technical solution of the utility model, further description is now made with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the utility model.

[0017] In the following detailed description, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present invention. However, it is apparent that one or more embodiments may be implemented without these specific details. In addition, in the following description, descriptions of known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present invention.

[0018] like Figure 1-2As shown, the DC brushless permanent magnet synchronous outer rotor motor for industrial ceiling fans involved in the utility model comprises an outer rotor 1, an upper cover 2, a lower cover 3, a central shaft 4, a stator 5 and an external driver 6. Among them, at least three groups of first connecting plates 21 for connecting fan blades are provided on the outer periphery of the upper cover 2, and a plurality of bolt holes are provided on the first connecting plates 21. The bottom of the upper cover 2 is fixedly connected to the upper end of the outer rotor 1, and the top of the lower cover 3 is fixedly connected to the lower end of the outer rotor 1. In specific implementation, the upper cover 2 and the lower cover 3 are fixedly connected to the housing 12 of the outer rotor 1 through a plurality of fixing bolts and self-locking nuts.

[0019] The stator 5 is installed in the internal cavity formed by the outer rotor 1, the upper cover 2, and the lower cover 3. The central shaft 4 passes through the central holes of the upper cover 2, the stator 5, and the lower cover 3 in sequence, and the central shaft 4 is rotatably connected to the upper cover 2 and the lower cover 3 through the first deep groove ball bearing 7 and the second deep groove ball bearing 8, respectively. The upper cover 2, the lower cover 3 and the first deep groove ball bearing 7 and the second deep groove ball bearing 8 form a rotating dynamic seal through the skeleton oil seal 9. A label is attached to the bottom of the lower cover 3.

[0020] Among them, the stator 5 includes an iron core 51 and a coil 52 wound inside the iron core 51. A plurality of magnets 11 are pasted on the inner wall of the outer rotor 1 at equal intervals, and a plurality of magnets 11 are arranged around the iron core 51. In a specific implementation, the gap between the iron core 51 of the stator and the corresponding magnet 11 is in the range of 0.5-1mm. The magnetic field generated when the outer ring of the stator 5 rotates interacts with the magnets 11 to generate a torque to drive the outer rotor 1 to rotate. The external driver 6 is arranged on the outside of the iron core 51, and one end of the connecting line of the external driver 6 passes through the central axis 4 and is electrically connected to the iron core 51. The outer rotor 1 includes a cylindrical shell 12 that passes through from top to bottom. A second connecting plate 13 for connecting with the first connecting plate 21 is provided around the top of the shell 12, and a plurality of bolt holes for fixing the fan blades are provided on the second connecting plate 13.

[0021] In summary, the brushless DC permanent magnet synchronous outer rotor motor for industrial ceiling fans designed by the utility model uses magnetic steel instead of rotor winding, does not require excitation current, reduces motor loss, greatly improves motor efficiency, and has a wide speed regulation range, can save the reduction device, reduce motor components, and save motor manufacturing costs. At the same time, the overall volume and weight of the industrial ceiling fan are reduced, making it easy to install.

[0022] The above embodiments are merely descriptions of the preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. A brushless DC permanent magnet synchronous outer rotor motor for an industrial ceiling fan, characterized in that: The invention comprises an outer rotor (1), an upper cover (2), a lower cover (3), a central shaft (4), a stator (5) and an external driver (6); the outer periphery of the upper cover (2) is provided with at least three groups of first connecting plates (21) for connecting the fan blades; a plurality of bolt holes are provided on the first connecting plates (21); the bottom of the upper cover (2) is fixedly connected to the upper end of the outer rotor (1); the top of the lower cover (3) is fixedly connected to the lower end of the outer rotor (1); the stator (5) is installed in an internal cavity formed by the outer rotor (1), the upper cover (2) and the lower cover (3); the central shaft (4) passes through the central holes of the upper cover (2), the stator (5) and the lower cover (3) in sequence; and the central shaft (4) is rotatably connected to the upper cover (2) and the lower cover (3) respectively through a first deep groove ball bearing (7) and a second deep groove ball bearing (8); the upper cover (2), the lower cover (3) and the first deep groove ball bearing (7) and the second deep groove ball bearing (8) are connected to each other in rotation; A rotating dynamic seal is formed by a skeleton oil seal (9); the stator (5) comprises an iron core (51) and a coil (52) wound inside the iron core (51); a plurality of magnets (11) are pasted on the inner wall of the outer rotor (1) at equal intervals; the plurality of magnets (11) are arranged around the iron core (51); the plurality of magnets (11) interact with the magnetic field generated when the outer ring of the stator (5) rotates to generate a torque to drive the outer rotor (1) to rotate; the external driver (6) is arranged outside the iron core (51), and one end of the connecting line of the external driver (6) passes through the central axis (4) and is electrically connected to the iron core (51); the outer rotor (1) comprises a cylindrical shell (12) that passes through from top to bottom; a second connecting plate (13) for matching and connecting with the first connecting plate (21) is arranged around the top of the shell (12); and the second connecting plate (13) is provided with a plurality of bolt holes for matching and fixing the fan blades.

2. The brushless DC permanent magnet synchronous outer rotor motor for industrial ceiling fans according to claim 1, characterized in that: The gap between the stator iron core (51) and the corresponding magnetic steel (11) is in the range of 0.5-1 mm.

3. The brushless DC permanent magnet synchronous outer rotor motor for industrial ceiling fans according to claim 2, characterized in that: The upper cover (2) and the lower cover (3) are fixedly connected to the housing (12) of the outer rotor (1) via a plurality of fixing bolts and self-locking nuts.

4. The brushless DC permanent magnet synchronous outer rotor motor for industrial ceiling fans according to claim 3, characterized in that: A label is attached to the bottom of the lower cover (3).

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