A high-sealing permanent magnet brushless motor

Abstract

This utility model discloses a high-sealing permanent magnet brushless motor, relating to the technical field of brushless motors. It includes a motor housing, an output shaft, a filter element, and a rotor. The motor housing has a ring-shaped fastening hole on its outer side. A cooling mechanism is located on one side of the motor housing. A stator winding is located inside the motor housing, and a rotor is located outside the stator winding. The rotor and output shaft are connected by a key. A purification mechanism is located on one side of the motor housing, which purifies the intake air before injecting it into the motor housing, preventing dust from entering the motor housing and affecting heat dissipation. The negative pressure generated by the rotating fan blades draws hot air from inside the motor. Driven by the airflow, the hot air flows towards a one-way exhaust valve, preventing rainwater or humid air from entering the motor through the air passage, thus avoiding a decrease in the winding insulation resistance caused by humid air.

Description

Technical Field

[0001] This utility model relates to the technical field of brushless motors, specifically to a high-sealing permanent magnet brushless motor. Background Technology

[0002] A brushless DC motor consists of a motor body and a driver. It is a typical mechatronic product. The position sensor commutates the current in the stator windings in a certain sequence according to the change in rotor position. The operating voltage of the stator windings is provided by an electronic switching circuit controlled by the position sensor output.

[0003] Traditional permanent magnet brushless motors typically rely on simple seals at the seams of the outer casing for their sealing design. When the motor is running, air needs to be introduced through heat dissipation holes or air inlets. External dust, metal particles, fibers, and other impurities can easily enter the motor and adhere to the stator windings, rotor magnets, or bearings, causing short circuits in the windings and demagnetization of the magnets. Furthermore, external liquids or humid air can directly enter the heat dissipation holes or air intake holes, affecting the sealing performance of the brushless motor. Utility Model Content

[0004] The purpose of this invention is to provide a high-sealing permanent magnet brushless motor to solve the above-mentioned defects caused by the prior art.

[0005] A high-sealing permanent magnet brushless motor includes a motor housing, an output shaft, a filter element, and a rotor. The motor housing has a ring-shaped fastening hole on its outer side. A cooling mechanism is located on one side of the motor housing. A stator winding is located inside the motor housing, and a rotor is located outside the stator winding. The rotor and output shaft are connected by a key. A purification mechanism is located on one side of the motor housing, which purifies the intake air before injecting it into the motor housing to prevent dust from entering the motor housing and affecting heat dissipation. The cooling mechanism effectively removes heat generated by the stator winding and rotor during operation through the circulating air.

[0006] Preferably, the cooling mechanism includes an output shaft, an air supply housing, a one-way air outlet valve, an air supply pipe, a fan blade, and a bearing. The output shaft is disposed through one side of the motor housing, and the bearing is connected to the outer side of the output shaft. A fan blade is connected to one end of the output shaft. The one-way air outlet valve is disposed through one side of the motor housing, and the air supply pipe is connected through one side of the motor housing. The bearing is disposed inside the air supply housing.

[0007] Preferably, the gas delivery housing is connected to the output shaft key via internally provided fan blades.

[0008] Preferably, the air supply housing is connected to the sealing gasket through a fastener that passes through one side, and the sealing gasket is in close contact with the motor housing.

[0009] Preferably, the purification mechanism includes an air intake shell, a one-way air intake valve, a filter element, fasteners, and a sealing gasket. The one-way air intake valve is provided on one side of the air intake shell, the bottom end of the air delivery shell is bolted to the top of the air intake shell, the filter element is provided inside the air intake shell, the fasteners are threaded to the side of the air delivery shell, the sealing gasket is attached to one side of the air delivery shell, and the air delivery shell is located on one side of the motor housing.

[0010] Preferably, the air intake shell is connected to the bottom end of the air delivery shell through a filter element disposed on one side, and the bottom end of the air delivery shell has a circular opening structure.

[0011] Compared with the prior art, the present invention has the following advantages: 1. The negative pressure generated by the rotation of the fan blades will draw out the hot air inside the motor. The hot air flows towards the one-way exhaust valve under the push of the airflow, which can prevent rainwater or humid air from entering the motor through the air passage. This avoids the humid air from causing a decrease in the insulation resistance of the windings or even a breakdown. Since the one-way exhaust valve only allows gas to be discharged from inside the motor to the outside, the hot air is directly discharged to the external environment, avoiding accumulation inside the motor.

[0012] 2. The circular opening of the air supply shell and the connection design with the filter element ensure that clean air must pass through a complete filtration path before entering the motor. The negative pressure inside the motor housing disappears, and the valve plate of the one-way air intake valve closes under the action of gravity or spring force, blocking the entry of external air. This fundamentally prevents the intrusion of external water vapor, moisture and dust impurities. At the same time, the moisture in the unfiltered external air will condense on the surface of the stator winding insulation layer, resulting in a decrease in insulation resistance. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0014] Figure 2 This is a schematic diagram of the front section structure of the motor housing in this utility model.

[0015] Figure 3 This is a top view schematic diagram of the air intake shell structure in this utility model.

[0016] Figure 4 This is a schematic diagram of the purification mechanism in this utility model.

[0017] Figure 5 This is a schematic diagram of the internal structure of the gas delivery shell in this utility model.

[0018] in: 1. Motor housing; 2. Output shaft; 3. Fastening hole; 4. Cooling mechanism; 5. Intake shell; 6. Outlet shell; 7. Purification mechanism; 8. One-way inlet valve; 9. Filter element; 10. Stator winding; 11. Rotor; 12. Fastener; 13. One-way outlet valve; 14. Outlet pipe; 15. Fan blade; 16. Bearing; 17. Sealing gasket. Detailed Implementation

[0019] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0020] like Figures 1 to 5 As shown, a high-sealing permanent magnet brushless motor includes a motor housing 1, an output shaft 2, a filter element 9, and a rotor 11. The motor housing 1 has a ring-shaped fastening hole 3 on its outer side. A cooling mechanism 4 is provided on one side of the motor housing 1. A stator winding 10 is disposed inside the motor housing 1, and the rotor 11 is disposed outside the stator winding 10. The rotor 11 is connected to the output shaft 2 by a key. A purification mechanism 7 is provided on one side of the motor housing 1. The purification mechanism 7 purifies the intake air before injecting it into the motor housing 1, preventing dust in the air from entering the motor housing 1 and affecting heat dissipation. The cooling mechanism 4 effectively removes the heat generated by the stator winding 10 and rotor 11 during operation through the circulating air.

[0021] In this embodiment, the cooling mechanism 4 includes an output shaft 2, an air supply housing 6, a one-way air outlet valve 13, an air supply pipe 14, a fan blade 15, and a bearing 16. The output shaft 2 is disposed through one side of the motor housing 1, and the bearing 16 is connected to the outer side of the output shaft 2. The fan blade 15 is connected to one end of the output shaft 2. The one-way air outlet valve 13 is disposed through one side of the motor housing 1, and the air supply pipe 14 is connected through one side of the motor housing 1. The bearing 16 is disposed inside the air supply housing 6. The air supply housing 6 is keyed to the output shaft 2 through the fan blade 15 disposed inside. The air supply housing 6 is connected through one side to a sealing gasket 17, and the sealing gasket 17 is in close contact with the motor housing 1.

[0022] Specifically: When the fan blade 15 rotates and generates negative pressure, the hot air inside the motor is drawn into the air supply pipe 14, passes through the air supply shell 6, and is finally discharged through the one-way air outlet valve 13. When the motor stops, the one-way air outlet valve 13 is closed to prevent external air from entering. The air supply shell 6 serves as the housing of the fan blade 15, and its internal structure further optimizes the airflow direction, organizing the turbulent airflow generated by the fan blade 15 into a concentrated, high-speed axial airflow, ensuring that the airflow enters the air supply pipe 14 efficiently.

[0023] In this embodiment, the purification mechanism 7 includes an air intake shell 5, a one-way air intake valve 8, a filter element 9, a fastener 12, and a sealing gasket 17. The one-way air intake valve 8 is provided on one side of the air intake shell 5. The bottom end of the air delivery shell 6 is bolted to the top of the air intake shell 5. The filter element 9 is provided inside the air intake shell 5. The fastener 12 is threaded to the side of the air delivery shell 6. The sealing gasket 17 is attached to one side of the air delivery shell 6. The air delivery shell 6 is located on one side of the motor housing 1. The air intake shell 5 is connected to the bottom end of the air delivery shell 6 through the filter element 9, which is provided through one side. The bottom end of the air delivery shell 6 has a circular opening structure.

[0024] Specifically: the output shaft 2 drives the fan blades 15 to generate forced airflow, which has a heat dissipation efficiency far higher than that of natural convection. The air supply pipe 14 can directly guide clean air to the heat concentration area of ​​the stator and rotor 11, reducing the risk of magnet demagnetization caused by thermal stress. The valve plate of the one-way exhaust valve 13 is reset under the action of spring force or gravity, closing the exhaust port and preventing external air from flowing back in. The valve plate of the one-way intake valve 8 is closed under the action of gravity or spring force, blocking external air from entering the interior of the motor housing 1.

[0025] In practical applications, this type of highly sealed permanent magnet brushless motor includes the following functions: Step 1: The air supply shell 6 is tightly connected to the motor housing 1 by fasteners 12. The sealing gasket 17 is pressed between the connecting surfaces. The elastic deformation of the sealing gasket 17 fills the tiny gaps in the machined or assembled surfaces. The filter element 9 is fixed inside the air intake shell 5 by snaps or threads. The air intake shell 5 is a funnel-shaped or cylindrical cavity. Its bottom opening is connected to the bottom opening of the air supply shell 6 by bolts. At the same time, the one-way air intake valve 8 is fixed to the air inlet of the air intake shell 5 by threads or snaps. Step 2: When the brushless motor is running, a slight negative pressure is formed inside the motor housing 1 due to the discharge of hot air. Under atmospheric pressure, the air outside the motor housing 1 flows to the intake shell 5. A one-way air intake valve 8 is set at the inlet end of the intake shell 5, which only allows gas to flow from the outside to the inside of the motor housing 1, ensuring that the outside air can only enter the inside of the motor housing 1 through the intake shell 5. Sealing gaskets 17 are set on the connection surface between the intake shell 5 and the air delivery shell 6, and on the contact surface between the air delivery shell 6 and the motor housing 1, to prevent unfiltered air from directly entering the inside of the motor housing 1 from the interface gap and bypassing the filter element 9. The operator locks the corresponding equipment through the annular fastening holes 3. Step 3: When the motor is running, the driver generates a magnetic field in the stator winding 10 based on the signal fed back by the rotor 11 position sensor, such as a Hall sensor. Under the action of the stator rotating magnetic field, the permanent magnet of the rotor 11 will be subjected to the attraction and repulsion forces between the magnetic poles. When the N pole of the rotating magnetic field approaches the S pole of the rotor 11, the two attract each other, driving the rotor 11 to rotate synchronously with the rotating magnetic field at the same speed. Step 4: When the rotor 11 rotates at a constant speed under the action of electromagnetic torque, the torque is transmitted to the output shaft 2 through the flat key. The air entering the intake shell 5 needs to be filtered by the filter element 9. The porous structure of the filter element 9 can intercept impurities such as dust and oil mist in the air. After the filtered clean air is collected in the intake shell 5, it flows into the air supply shell 6 through the opening at the top. The intake shell 5 and the air supply shell 6 are connected by bolts to ensure that the interface is sealed. The circular opening of the air supply shell 6 is connected to one end of the air supply pipe 14. The clean air is further guided to the heating area inside the motor housing 1 through the air supply pipe 14, and then the hot air is directly discharged through the one-way exhaust valve 13.

[0026] Therefore, the above-disclosed embodiments are merely illustrative in all respects and are not the only ones. All modifications within the scope of this utility model or its equivalents are included in this utility model.

Claims

1. A high-sealing permanent magnet brushless motor, characterized by: The device includes a motor housing (1), an output shaft (2), a filter element (9), and a rotor (11). The motor housing (1) has a fastening hole (3) arranged in an annular shape on its outer side. A cooling mechanism (4) is provided on one side of the motor housing (1). A stator winding (10) is provided inside the motor housing (1). A rotor (11) is provided on the outer side of the stator winding (10). The rotor (11) is connected to the output shaft (2) by a key. A purification mechanism (7) is provided on one side of the motor housing (1). The purification mechanism (7) purifies the intake air and then injects it into the interior of the motor housing (1) to prevent dust in the air from entering the motor housing (1) and affecting heat dissipation. The cooling mechanism (4) effectively removes the heat generated by the stator winding (10) and the rotor (11) during operation by circulating the injected air.

2. A high-sealing permanent magnet brushless motor according to claim 1, characterized in that: The cooling mechanism (4) includes an output shaft (2), an air supply shell (6), a one-way air outlet valve (13), an air supply pipe (14), a fan blade (15), and a bearing (16). The output shaft (2) is disposed through one side of the motor housing (1). The bearing (16) is connected to the outside of the output shaft (2). The fan blade (15) is connected to one end of the output shaft (2). The one-way air outlet valve (13) is disposed through one side of the motor housing (1). The air supply pipe (14) is connected through one side of the motor housing (1). The bearing (16) is disposed inside the air supply shell (6).

3. A high-sealing permanent magnet brushless motor according to claim 2, characterized in that: The gas delivery housing (6) is keyed to the output shaft (2) via internally provided fan blades (15).

4. A high-sealing permanent magnet brushless motor according to claim 3, characterized in that: The gas delivery housing (6) is connected to the sealing gasket (17) through a fastener (12) that is connected through one side, and the sealing gasket (17) is in contact with the motor housing (1).

5. The high-sealing permanent magnet brushless motor according to claim 1, characterized in that: The purification mechanism (7) includes an air intake shell (5), a one-way air intake valve (8), a filter element (9), a fastener (12), and a sealing gasket (17). The air intake shell (5) is provided with a one-way air intake valve (8) on one side. The top of the air intake shell (5) is bolted to the bottom of the air delivery shell (6). The air intake shell (5) is provided with a filter element (9) inside. The side of the air delivery shell (6) is threaded with a fastener (12). The side of the air delivery shell (6) is fitted with a sealing gasket (17). The air delivery shell (6) is located on one side of the motor housing (1).

6. A high-sealing permanent magnet brushless motor according to claim 5, characterized in that: The air intake shell (5) is connected to the bottom end of the air delivery shell (6) through a filter element (9) that is installed through one side. The bottom end of the air delivery shell (6) is a circular opening structure.

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