Motor of industrial fan

Abstract

The utility model provides a motor of an industrial fan, and belongs to the technical field of industrial fans. The problem that an existing motor is low in power is solved. The motor of the industrial fan comprises a stator shaft, a stator assembly and an outer rotor, the stator assembly is located in the outer rotor, the inner end of the stator shaft is fixedly connected with the stator assembly, the outer end of the stator shaft penetrates out of the outer rotor, 54 grooves are formed in the circumferential edge of the stator assembly at equal intervals, 48 pieces of magnetic steel are fixedly connected to the inner circumferential wall of the outer rotor at equal intervals, and the outer rotor is located in the outer rotor. And a gap is formed between two adjacent magnetic steels. The motor of the industrial fan has the advantage of increasing the power of the motor.

Description

Technical Field

[0001] This utility model belongs to the field of industrial fan technology and relates to a motor for an industrial fan. Background Technology

[0002] Industrial fans are large fans designed specifically for industrial environments. They are mainly used in factories, warehouses, workshops and other places to provide air circulation and cooling, and improve ventilation and temperature in the working environment.

[0003] Existing industrial fans, such as the stator shaft mounting structure and external rotor axial flow fan disclosed in Chinese patent literature [Patent No.: 202122925752.7; Application Publication No.: CN216975278U], include a column, a stator shaft, a stator assembly, an external rotor, and several fan blades. The stator assembly is coaxially fixed on the stator shaft, the external rotor is coaxially and rotatably mounted outside the stator assembly, several fan blades are fixedly mounted on the external rotor, and one end of the stator shaft is fixed on the column.

[0004] In this type of axial flow fan, the number of slots on the stator assembly is the same as the number of magnets fixed on the outer rotor. For example, there are 54 slots and 54 magnets, or 48 slots and 48 magnets. Moreover, in this type of axial flow fan, each blade is directly fixed to the outer rotor by bolts, and each blade is independently fixed. When the bolts become loose, there is a risk that the blades may fall off when the blades rotate. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a motor for an industrial fan, and to solve the technical problem of how to increase the power of the motor.

[0006] The objective of this utility model can be achieved through the following technical solution: an industrial fan motor, comprising a stator shaft, a stator assembly, and an outer rotor, wherein the stator assembly is located in the outer rotor, the inner end of the stator shaft is fixedly connected to the stator assembly, and the outer end extends out of the outer rotor, characterized in that 54 slots are equally spaced along the circumferential edge of the stator assembly, and 48 magnets are equally spaced and fixedly connected on the inner circumferential wall of the outer rotor, with a gap between adjacent magnets.

[0007] This motor has 54 slots and 48 magnets, meaning it has 48 poles. The relatively low number of poles allows for a higher synchronous speed, increasing the motor's power. Furthermore, it reduces cogging torque, minimizes harmonic losses, and improves efficiency, indirectly boosting the motor's power. Finally, by controlling the torque drop, the motor's speed advantage is maintained while the torque decrease is limited, resulting in a high-speed, low-torque motor that further enhances its power output.

[0008] In the aforementioned industrial fan motor, the outer rotor includes a front cover, a cylinder, and a rear cover. The front cover is fixedly connected to the rear cover via the cylinder. The outer end of the stator shaft passes through the rear cover and extends out of the outer rotor. The magnets are fitted and fixedly connected to the inner circumferential wall of the cylinder. The front cover, cylinder, and rear cover are fixedly connected by a combination of bolts and nuts. The cylinder is cylindrical, which facilitates and optimizes the arrangement of the magnets.

[0009] In the motor of the aforementioned industrial fan, the length of the magnet along the stator shaft is less than the length of the cylinder, and the two ends of the magnet are recessed relative to the two ends of the cylinder. This structure can optimize magnetic field distribution, reduce vibration and noise, and improve stability.

[0010] In the motor of the aforementioned industrial fan, the outer end of the stator shaft is a flat section, both sides of which are arc-shaped and have external threads. The outer end of the stator shaft passes through a fixing frame. The flat section allows the stator shaft and the fixing frame to be circumferentially positioned, while the external threads allow for the installation of a nut, enabling the stator shaft and the fixing frame to be axially positioned.

[0011] In the motor of the aforementioned industrial fan, the stator shaft has a wire-passing hole arranged along its own axial direction, the wire-passing hole penetrating the outer end face of the stator shaft. The wire is threaded through the wire-passing hole, preventing external interference to the wire.

[0012] In the aforementioned industrial fan motor, the industrial fan further includes several blades and a circular pressure plate. The end face of the front cover has several fan-shaped positioning grooves spaced at equal intervals, forming a circle. Each positioning groove has a fixing blind hole at its bottom. The inner ends of all the blades are respectively embedded in the positioning grooves and pressed down by the pressure plate. Fasteners pass through the pressure plate and are inserted into the fixing blind holes to secure the pressure plate and the blades to the front cover. By locking the pressure plate with multiple fasteners such as bolts, and then pressing down on all the blades, even if one or two bolts loosen, the pressure plate can still hold the blades in place, preventing them from falling off and improving safety.

[0013] In the motor of the aforementioned industrial fan, the bottom of the positioning groove also has a protruding, arc-shaped retaining strip, which is embedded in the blade. The retaining strip further enhances the firmness of the blade installation and improves safety.

[0014] In the motor of the aforementioned industrial fan, the inner end of the blade has a fixing hole, which is strip-shaped. The strip shape of the fixing hole allows the blade to be offset to the left or right by a certain amount during installation, enabling the fixing hole to better align with the blind fixing hole, thus improving the stability of the blade installation and enhancing safety.

[0015] Compared with the prior art, the motor of the industrial fan provided by this utility model has the following advantages:

[0016] 1. This motor has 54 slots and 48 magnets, i.e., 48 poles. The relatively small number of poles results in a higher synchronous speed, which increases the power of the industrial fan.

[0017] 2. This motor reduces cogging torque, reduces harmonic losses, improves efficiency, and indirectly increases the motor's power.

[0018] 3. This motor only needs to control the torque drop rate to ensure that the motor speed advantage is significant and the torque drop is limited, so that this motor has high speed and low torque, thereby increasing the motor power.

[0019] 4. The blades of this industrial fan are held in place by a pressure plate. Even if one or two bolts are loose, the blades can still be held in place by the pressure plate, preventing them from falling off and improving safety. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this industrial fan.

[0021] Figure 2 This is a schematic diagram of the arrangement of the magnets and slots of this motor.

[0022] Figure 3 This is a schematic diagram of the overall structure of the external rotor of this motor.

[0023] Figure 4 This is an exploded view of the motor, blades, and pressure plate.

[0024] In the diagram, 1. Stator shaft; 11. Flat section; 12. Wire hole; 2. Stator assembly; 3. Outer rotor; 31. Front cover; 32. Cylinder block; 33. Rear cover; 4. Slot; 5. Magnet; 6. Blade; 61. Fixing hole; 7. Pressure plate; 8. Positioning slot; 9. Fixing blind hole; 10. Snap-fit ​​strip. Detailed Implementation

[0025] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0026] like Figure 1 , Figure 2 , Figure 3 As shown, this industrial fan includes a motor, blades 6 and pressure plate 7. The motor includes a stator shaft 1, a stator assembly 2, an outer rotor 3 and a magnet 5.

[0027] The stator assembly 2 is located in the outer rotor 3. The outer rotor 3 includes a front cover 31, a cylinder 32 and a rear cover 33. The front cover 31 is fixedly connected to the rear cover 33 through the cylinder 32. The inner end of the stator shaft 1 is fixedly connected to the stator assembly 2. The outer end of the stator shaft 1 passes through the rear cover 33 and extends out of the outer rotor 3.

[0028] The outer end of the stator shaft 1 is a flat section 11, both sides of which are arc-shaped and have external threads. The stator shaft 1 has a wire-passing hole 12 arranged along its own axial direction, which penetrates the outer end face of the stator shaft 1.

[0029] Magnets 5 are fixedly attached to the inner circumferential wall of cylinder 32. The length of magnets 5 along the stator shaft 1 is less than the length of cylinder 32, and the two ends of magnets 5 are recessed relative to the two ends of cylinder 32. 54 slots 4 are evenly spaced along the circumferential edge of stator assembly 2, and 48 magnets 5 are evenly fixedly attached to the inner circumferential wall of outer rotor 3, with gaps between adjacent magnets 5.

[0030] like Figure 4 As shown, the pressure plate 7 is circular. In this embodiment, there are six blades 6. Eight fan-shaped positioning grooves 8 are evenly spaced on the end face of the front cover 31, forming a circle. In actual production, the number of blades 6 can be three or eight, and the number of positioning grooves 8 can be three or eight. The bottom of the groove 4 of the positioning groove 8 has a fixing blind hole 9 and a protruding arc-shaped snap-fit ​​strip 10. The inner end of the blade 6 has a fixing hole 61, which is a strip-shaped hole. The inner ends of all blades 6 are respectively embedded in the positioning grooves 8, and the snap-fit ​​strip 10 is embedded in the blades 6. The inner ends of all blades 6 are pressed by the pressure plate 7, and fasteners such as bolts pass through the pressure plate 7, the fixing hole 61, and the fixing blind hole 9 to fix the pressure plate 7 and the blades 6 to the front cover 31.

[0031] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0032] Although this document frequently uses terms such as stator shaft 1, flat section 11, wire hole 12, stator assembly 2, outer rotor 3, front cover 31, cylinder 32, rear cover 33, slot 4, magnet 5, blade 6, fixing hole 61, pressure plate 7, positioning slot 8, fixing blind hole 9, and snap-fit ​​strip 10, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. An industrial fan motor, comprising a stator shaft (1), a stator assembly (2), and an outer rotor (3), wherein the stator assembly (2) is located within the outer rotor (3), the inner end of the stator shaft (1) is fixedly connected to the stator assembly (2), and the outer end extends out of the outer rotor (3), characterized in that, The stator assembly (2) has 54 slots (4) evenly spaced along its circumferential edge, and the outer rotor (3) has 48 magnets (5) evenly spaced along its inner circumferential wall, with a gap between adjacent magnets (5).

2. The motor of an industrial fan according to claim 1, characterized in that, The outer rotor (3) includes a front cover (31), a cylinder (32) and a rear cover (33). The front cover (31) is fixedly connected to the rear cover (33) through the cylinder (32). The outer end of the stator shaft (1) passes through the rear cover (33) and extends out of the outer rotor (3). The magnet (5) is attached to the inner circumferential wall of the cylinder (32).

3. The motor of an industrial fan according to claim 2, characterized in that, The length of the magnet (5) along the axial direction of the stator shaft (1) is less than the length of the cylinder (32), and the two ends of the magnet (5) are recessed relative to the two ends of the cylinder (32).

4. The motor of an industrial fan according to claim 1, 2, or 3, characterized in that, The outer end of the stator shaft (1) is a flat section (11), both sides of which are arc-shaped and have external threads.

5. The motor of an industrial fan according to claim 1, 2, or 3, characterized in that, The stator shaft (1) has a wire hole (12) arranged along its own axial direction, and the wire hole (12) penetrates the outer end face of the stator shaft (1).

6. The motor of an industrial fan according to claim 2 or 3, characterized in that, The industrial fan also includes several blades (6) and a circular plate-shaped pressure plate (7). Several fan-shaped positioning grooves (8) are provided at equal intervals on the end face of the front cover (31). All the positioning grooves (8) form a circle. The bottom of the groove (4) of the positioning groove (8) has a fixing blind hole (9). The inner ends of all the blades (6) are respectively embedded in the positioning grooves (8) and pressed by the pressure plate (7). Fasteners pass through the pressure plate (7) and are inserted into the fixing blind hole (9) to fix the pressure plate (7) and the blades (6) to the front cover (31).

7. The motor of an industrial fan according to claim 6, characterized in that, The bottom of the groove (4) of the positioning groove (8) also has a protruding and arc-shaped snap-fit ​​strip (10), which is embedded in the blade (6).

8. The motor of an industrial fan according to claim 6, characterized in that, The inner end of the blade (6) has a fixing hole (61), which is strip-shaped.

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