A direct current brushless outer rotor motor

Abstract

The present application relates to the technical field of elastic fluid pump, and discloses a direct-current brushless outer rotor motor, an outer ring is located at the outer side of an inner ring, a gap is arranged between the outer ring and the inner ring, a brush is embedded in the outer ring and is communicated between the inner side and the outer side of the outer ring, the inner side of the brush is in contact with the inner ring, an anti-electric corrosion structure is located at one side of a bearing, the inner ring is connected with a heat dissipation driving shaft in an interference fit, through the anti-electric corrosion structure design, the electric corrosion of the shaft current to the bearing is effectively inhibited, the heat dissipation efficiency of the motor is significantly improved, the internal temperature of the motor is reduced, the stable operation of the motor under high load working conditions is ensured, the service life of the motor is prolonged, the transmission shaft reduces the magnetic flux leakage, generates electromotive force, and reduces the influence of the magnetic flux leakage of the motor on the fixed shell and the tail sleeve shell due to the electromagnetic eddy current electric heat accumulation, in the alternating magnetic field of the motor, the magnetic flux leakage of the motor exists in the form of the electromotive force of the transmission shaft.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of direct-current brushless outer rotor motor, belongs to flexible fluid pump technical field. BACKGROUND

[0002] Direct-current brushless outer rotor motor is widely used in fan, unmanned aerial vehicle, new energy vehicle cooling system and other fields due to its compact structure, large air volume, fast response speed and other advantages. However, its special outer rotor rotating structure leads to severe electric corrosion and heat dissipation problems during operation. On the one hand, shaft current generated by high-frequency pulse voltage is easy to pass through the bearing, causing bearing electric corrosion and shortening the service life of the motor. On the other hand, the structure of the outer rotor wrapping the stator makes it difficult to open cooling grooves on the outer periphery of the outer rotor due to dynamic balance problems, so that internal heat is difficult to dissipate. Traditional cooling methods (such as simply adding cooling fins) cannot meet the high-power operation requirements. Excessive temperature can cause demagnetization of permanent magnets and aging of winding insulation, affecting the performance and reliability of the motor. High-frequency pulse voltage can generate heat in the metal motor. Therefore, it can be known that the current direct-current brushless outer rotor motor at least has the following problems:

[0003] Excessive temperature can cause demagnetization of permanent magnets and aging of winding insulation.

[0004] It is difficult to open cooling grooves on the outer periphery of the outer rotor due to dynamic balance problems.

[0005] Shaft current generated by high-frequency pulse voltage is easy to pass through the bearing, causing bearing electric corrosion.

[0006] The rotating structure of the outer rotor leads to severe electric corrosion and heat dissipation problems during operation. Shaft current generated by high-frequency pulse voltage is easy to pass through the bearing, causing bearing electric corrosion and shortening the service life of the motor.

[0007] Therefore, it is necessary to propose a direct-current brushless outer rotor motor to address the problem of heat accumulation in the outer rotor motor. SUMMARY

[0008] The present application provides a kind of direct-current brushless outer rotor motor, and the heat of outer rotor motor is easy to accumulate.

[0009] The present application provides a kind of direct-current brushless outer rotor motor, comprising:

[0010] The transmission shaft includes a spline shaft, a heat dissipation drive shaft and a connecting sleeve. The spline shaft is arranged inside the connecting sleeve, and the spline shaft is fixedly connected with the connecting sleeve. The heat dissipation drive shaft is arranged inside the connecting sleeve, and the heat dissipation drive shaft is fixedly connected with the connecting sleeve.

[0011] Specifically, the heat dissipation driving shaft is connected with a reinforced heat dissipation structure, the reinforced heat dissipation structure comprises a wind guide component and a heat dissipation fan, the heat dissipation fan comprises a wind wheel, the wind wheel is connected to the end of the heat dissipation driving shaft; the wind guide component is arranged on the outer side of the end cover, the wind guide component is fixedly connected with the tail sleeve shell; the side wall of the wind guide component close to one end of the tail sleeve shell is provided with an air inlet, the inner wall of the wind guide component and the outer side of the end cover are provided with an air duct, and the air outlet of the wind guide component is located on the inner side of the air inlet of the wind wheel; when the motor is running, the wind wheel rotates to draw air under the driving of the heat dissipation driving shaft, the flow direction of the air path is inhaled from around the wind guide component, flows through the end cover and then flows out through the wind wheel; a gap is arranged radially between the air outlet of the wind guide component and the air inlet of the wind wheel; the air inlets are uniformly arranged on the cylindrical side wall of the wind guide component, and the air inlets are rectangular slots parallel to the axial direction of the outer rotor motor; the side of the wind guide component away from the tail sleeve shell is a horn mouth shape; the end of the wind wheel is a flat disc, the flat disc is connected perpendicularly to the heat dissipation driving shaft; the inner side of the flat disc is uniformly provided with an arc-shaped connecting plate, the intersection line of the arc-shaped connecting plate and the flat disc is a plane curve, a straight line is perpendicular to the flat disc and intersects with the plane curve, and the arc-shaped connecting plate is a curved surface formed by parallel movement of the straight line along the plane curve; the inner side of the wind wheel is a horn mouth shaped air inlet end, and the air inlet end is fixedly connected with the connecting plate; the air inlet of the air inlet end has a diameter slightly larger than that of the air outlet of the wind guide component.

[0012] The insulation bearing comprises a first bearing and a second bearing, the first bearing is sleeved on the heat dissipation driving shaft, the second bearing is sleeved on the heat dissipation driving shaft, the first bearing is arranged close to the connecting sleeve, and the first bearing is arranged between the second bearing and the connecting sleeve.

[0013] Specifically, the anti-electric corrosion structure of the insulation bearing comprises an inner ring, an outer ring and an electric brush, the inner ring and the outer ring are concentric annular, the outer ring is located on the outer side of the inner ring, and a gap is arranged between the inner ring and the outer ring; the electric brush is embedded in the outer ring and is connected between the inner side and the outer side of the outer ring, and the inner side of the electric brush is in contact with the inner ring; the anti-electric corrosion structure is located on one side of the bearing, the inner ring is connected to the heat dissipation driving shaft in an interference fit, the outer ring is fixed to the tail sleeve shell by being tightly pressed by the bearing, in the process of running of the motor, the inner ring rotates together with the transmission shaft and forms an electric circuit by contacting the electric brush through the brush head, and the outer ring is uniformly provided with a plurality of radial holes in the circumferential direction, and the electric brush is located in the holes.

[0014] The tail sleeve shell is sleeved on the outer circumferential surface of the first bearing, and the tail sleeve shell is sleeved on the outer circumferential surface of the second bearing.

[0015] The alternating stator is sleeved on the outer circumferential surface of the tail sleeve shell.

[0016] The permanent magnet part comprises at least two sub-magnets, each of which has the same structure, and the sub-magnets are arranged equidistantly around the central axis of the heat dissipation driving shaft, and the sub-magnets are arranged close to the outer peripheral wall of the alternating stator;

[0017] The fixed shell is attached to the outer peripheral wall of the sub-magnet, and the top of the fixed shell is provided with a through hole, and the connecting sleeve and the through hole are in mutual interference, and the connecting sleeve and the through hole are fixedly connected.

[0018] Further, the material of the tail sleeve shell is metal;

[0019] The metal material includes one or more of iron, aluminum, and silver.

[0020] Further, the tail sleeve shell includes a tail disc and a shaft ring column;

[0021] The central axis of the tail disc and the central axis of the shaft ring column coincide with each other;

[0022] The shaft ring column and the shaft ring column are fixedly connected with each other.

[0023] Further, the shaft ring column is sleeved on the outer peripheral surface of the insulating bearing.

[0024] Further, the shaft ring column includes a first sub-part, a second sub-part, and a third sub-part;

[0025] The first sub-part, the second sub-part, and the third sub-part are fixedly connected in sequence;

[0026] The outer diameter of the first sub-part is smaller than the outer diameter of the second sub-part;

[0027] The outer diameter of the second sub-part is smaller than the outer diameter of the third sub-part.

[0028] Further, the inner diameter of the first sub-part is greater than the inner diameter of the second sub-part;

[0029] The inner diameter of the second sub-part is smaller than the inner diameter of the third sub-part.

[0030] Further, the first sub-part is sleeved on the outer peripheral surface of the first bearing;

[0031] The third sub-part is sleeved on the outer peripheral surface of the second bearing.

[0032] Further, the first bearing and the second bearing have the same structure;

[0033] The first bearing and the second bearing are made of the same material.

[0034] Further, the first bearing includes a steel ball, an inner shell, and an outer shell;

[0035] The steel ball is arranged between the inner shell and the outer shell;

[0036] The inner shell wall of the outer shell abuts against the outer peripheral wall of the outer shell;

[0037] The inner shell wall of the inner shell abuts against the outer peripheral wall of the heat-dissipating drive shaft.

[0038] Further, the material of the inner shell is a non-metal material;

[0039] The material of the outer shell is a non-metal material.

[0040] Further, the tail end of the heat-dissipating drive shaft is connected with a heat-dissipating fan;

[0041] The tail end of the heat-dissipating drive shaft is further connected with a dustproof shell;

[0042] The dustproof shell is provided with a through hole;

[0043] The dustproof shell is sleeved on the outer peripheral part of the dustproof shell.

[0044] Further, the tail sleeve shell is provided with a ring plate;

[0045] The ring plate is provided with an injection shaft through hole;

[0046] The central axis of the through hole and the central axis of the ring plate coincide with each other;

[0047] The ring plate is arranged close to the insulating bearing;

[0048] The heat-dissipating drive shaft is arranged in the through hole.

[0049] The beneficial effects of the present application are:

[0050] The transmission shaft can bear the insulating bearing, and the insulating bearing can make the transmission shaft rotate around the central axis thereof. When the transmission shaft is in a magnetic field environment, electromotive forces are generated at both ends of the transmission shaft. The connecting sleeve can serve as a component for connecting the spline shaft and the heat-dissipating drive shaft. When the connecting sleeve is made of a metal material, the electromotive forces generated at both ends of the transmission shaft are larger, and the rotating transmission shaft reduces the magnetic flux leakage of the motor. The transmission shaft reduces the magnetic flux leakage to generate electromotive forces, and reduces the influence of the heat accumulation caused by the electromagnetic eddy current in the fixed shell and the tail sleeve shell. In the alternating magnetic field of the motor, the magnetic flux leakage of the motor exists in the form of the electromotive force of the transmission shaft.

[0051] The outer ring is located outside the inner ring, a gap is arranged between the two, the brush is embedded in the outer ring and is communicated between the inner side and the outer side of the outer ring, the inner side of the brush is in contact with the inner ring, the anti-electric corrosion structure is arranged on one side of the bearing, the inner ring is connected with the heat dissipation driving shaft in an interference fit, through the design of the anti-electric corrosion structure, the electric corrosion of the shaft current on the bearing is effectively inhibited, the heat dissipation efficiency of the motor is significantly improved, the internal temperature of the motor is reduced, the stable operation of the motor under high load working conditions is ensured, and the service life of the motor is prolonged.

[0052] The insulating bearing is arranged between the transmission shaft and the tail sleeve shell, since the insulating bearing is insulating, in the case that the transmission shaft has electromotive force at both ends, the insulating bearing prevents the formation of an electric circuit between the transmission shaft and the tail sleeve shell, reduces the probability of electric heat generated between metal conductors due to current, and prevents the accumulation of electric heat.

[0053] The alternating stator can wind thinner enameled wires, when the enameled wires pass analog current of various waveforms or switching current of various types, the alternating stator can generate a magnetic field, after the enameled wires pass analog current of various waveforms, the alternating stator can generate an alternating magnetic field, when the enameled wires pass switching current of various types, the alternating stator can generate an alternating magnetic field, and the alternating magnetic field can generate electric heat in the metal transmission shaft, the metal tail sleeve shell and the metal fixed shell.

[0054] The alternating magnetic field generated by the alternating stator interacts with the fixed magnetic field of the permanent magnet part, so that the transmission shaft rotates around the center axis thereof, when the transmission shaft rotates, the transmission shaft can realize leakage magnetic acquisition of the alternating magnetic field, which greatly reduces the leakage of the alternating magnetic field and reduces the heat generation of the motor, the fixed shell is attached to the outer circumferential wall of the magnetic segment, when the transmission shaft drives the fixed shell to rotate, the permanent magnet part includes at least two magnetic segments, the magnetic segments are arranged at equal circumferences around the center axis of the heat dissipation driving shaft, the magnetic segments are arranged close to the outer circumferential wall of the alternating stator, the fixed magnetic field generated by the permanent magnet part becomes a rotating gradient magnetic field, the magnetic density of the rotating gradient magnetic field is relatively good, and the occurrence of leakage can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0055] Figure 1 It is a schematic diagram of a direct-current brushless outer rotor motor of the present application;

[0056] Figure 2 It is a schematic diagram of a transmission shaft, a tail sleeve shell and a fixed shell of a direct-current brushless outer rotor motor of the present application;

[0057] Figure 3 It is a sectional structure diagram of a direct-current brushless outer rotor motor of the present application;

[0058] Figure 4 It is a schematic diagram of an internal structure of a direct-current brushless outer rotor motor of the present application;

[0059] Reference signs:

[0060] 100 - transmission shaft; 110 - spline shaft; 120 - heat dissipation driving shaft; 130 - connecting sleeve; 141 - air guide component; 142 - heat dissipation fan;

[0061] 143 - impeller; 144 - connecting plate; 145 - end cover; 146 - air inlet; 147 - air outlet; 200 - insulating bearing;

[0062] 210 - first bearing; 211 - steel ball; 212 - inner shell; 213 - outer shell; 220 - second bearing; 230 - anti-electric corrosion structure;

[0063] 231 - inner ring; 232 - outer ring; 233 - brush; 300 - tail sleeve shell; 310 - tail ring disc; 320 - shaft ring column;

[0064] 321 - first subpart; 322 - second subpart; 323 - third subpart; 400 - alternating stator; 500 - permanent magnet part;

[0065] 510 - sub-magnet; 600 - fixed shell; 610 - through hole. DETAILED DESCRIPTION

[0066] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described in detail below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0067] As shown in Figures 1 to 3 , the direct-current brushless outer rotor motor provided by the present application comprises:

[0068] The transmission shaft 100 comprises a spline shaft 110, a heat dissipation driving shaft 120 and a connecting sleeve 130. The spline shaft 110 is arranged inside the connecting sleeve 130, and the spline shaft 110 is fixedly connected with the connecting sleeve 130. The heat dissipation driving shaft 120 is arranged inside the connecting sleeve 130, and the heat dissipation driving shaft 120 is fixedly connected with the connecting sleeve 130.

[0069] The insulating bearing 200 comprises a first bearing 210 and a second bearing 220. The first bearing 210 is sleeved on the heat dissipation driving shaft 120, and the second bearing 220 is sleeved on the heat dissipation driving shaft 120. The first bearing 210 is arranged close to the connecting sleeve 130, and the first bearing 210 is arranged between the second bearing 220 and the connecting sleeve 130.

[0070] A tail sleeve shell 300 is sleeved on the outer circumferential surface of the first bearing 210, and the tail sleeve shell 300 is sleeved on the outer circumferential surface of the second bearing 220.

[0071] An alternating stator 400 is sleeved on the outer circumferential surface of the tail sleeve shell 300.

[0072] A permanent magnet part 500 includes at least two sub-magnets 510, each of the sub-magnets 510 has the same structure, the sub-magnets 510 are arranged at equal circumferences around the central axis of the heat-dissipation driving shaft 120, and the sub-magnets 510 are arranged close to the outer circumferential wall of the alternating stator 400.

[0073] A fixed shell 600 is attached to the outer circumferential wall of the sub-magnets 510, the top of the fixed shell 600 is provided with a through hole 610, the connecting sleeve 130 is in mutual interference with the through hole 610, and the connecting sleeve 130 is fixedly connected with the through hole 610.

[0074] Specifically, the transmission shaft 100 can accommodate the insulating bearing 200, and the insulating bearing 200 can enable the transmission shaft 100 to rotate around the central axis thereof. When the transmission shaft 100 is in a magnetic field environment, electromotive forces are generated at both ends of the transmission shaft 100, the connecting sleeve 130 can serve as a component for connecting the spline shaft 110 and the heat-dissipation driving shaft 120, when the connecting sleeve 130 is made of metal material, the electromotive forces generated at both ends of the transmission shaft 100 are large, and the rotating transmission shaft 100 reduces the magnetic flux leakage of the motor. The transmission shaft 100 generates electromotive forces by reducing the magnetic flux leakage, and reduces the influence of the heat accumulation of the fixed shell 600 and the tail sleeve shell 300 caused by electromagnetic eddy current. In the alternating magnetic field of the motor, the magnetic flux leakage of the motor exists in the form of the electromotive forces of the transmission shaft 100.

[0075] It can be understood that, as Figure 3As shown, the heat dissipation driving shaft 120 is connected with an enhanced heat dissipation structure, which comprises a wind guide component 141 and a heat dissipation fan 142, the heat dissipation fan 142 comprises a wind wheel 143 connected to the end of the heat dissipation driving shaft 120, the wind guide component 141 is arranged outside the end cover 145, the wind guide component 141 is fixedly connected with the tail sleeve shell 300, the wind guide component 141 is provided with an air inlet 146 near the side wall of one end of the tail sleeve shell 300, a wind channel is arranged between the inner wall of the wind guide component 141 and the outside of the end cover 145, the air outlet 147 of the wind guide component 141 is located inside the air inlet 146 of the wind wheel 143, when the motor is running, the wind wheel 143 rotates to draw air under the driving of the heat dissipation driving shaft 120, the flow direction of the air path is inhaled from around the wind guide component 141, flows out through the wind wheel 143 after passing through the end cover 145, a gap is radially arranged between the air outlet 147 of the wind guide component 141 and the air inlet 146 of the wind wheel 143, the air inlets 146 are uniformly arranged on the cylindrical side wall of the wind guide component 141, the air inlets 146 are rectangular slots parallel to the axial direction of the outer rotor motor, the side of the wind guide component 141 away from the tail sleeve shell 300 is a horn-shaped opening, the end of the wind wheel 143 is a flat disc, the flat disc is perpendicularly connected with the heat dissipation driving shaft 120, arc-shaped connecting plates 144 are uniformly arranged on the inner side of the flat disc, the intersection line of the arc-shaped connecting plates 144 and the flat disc is a plane curve, a straight line is perpendicular to the flat disc and intersects with the plane curve, the arc-shaped connecting plates 144 are curved surfaces formed by parallel movement of straight lines along the plane curve, the inner side of the wind wheel 143 is a horn-shaped air inlet end, the air inlet end is fixedly connected with the connecting plates 144, the air inlet of the air inlet end has a diameter slightly larger than that of the air outlet of the wind guide component 141.

[0076] The anti-electric corrosion structure 230 of the insulating bearing 200 comprises an inner ring 231, an outer ring 232 and an electric brush 233, the outer ring of the inner ring 231 is a concentric annular ring, the outer ring 232 is located outside the inner ring 231, and an inner gap is arranged between the two, the electric brush 233 is embedded in the outer ring 232 and communicates between the inner and outer sides of the outer ring 232, the electric brush 233 is in contact with the inner ring 231, the anti-electric corrosion structure 230 is located on one side of the bearing, the inner ring 231 is connected with the heat dissipation driving shaft 120 in an interference fit, the outer ring 232 is fixed with the tail sleeve shell 300 through bearing pressing, during the running of the motor, the inner ring 231 rotates together with the transmission shaft 100 and forms an electric circuit by contacting the electric brush 233 through the brush head, a plurality of radial holes are uniformly arranged on the circumference of the outer ring 232, and the electric brush 233 is located in the holes.

[0077] Briefly, the brush 233 of the insulating bearing 200 can guide the overflow current of the alternating stator 400, prevent the overflow current of the alternating stator 400 from passing through the inner ring 231 and the outer ring 232 of the anti-electric corrosion structure 230 of the insulating bearing 200, and effectively prevent the electric corrosion of the insulating bearing 200. It can be understood that the resistivity of the brush 233 of the insulating bearing 200 is very low, and the resistivity of the brush 233 of the insulating bearing 200 is much lower than the resistivity of the inner ring 231 of the insulating bearing 200 and the resistivity of the outer ring 232 of the insulating bearing 200, which can make the overflow current of the alternating stator 400 pass through the brush 233 first, and then make the overflow current of the alternating stator 400 not pass through the inner ring 231 and the outer ring 232 of the anti-electric corrosion structure 230 of the insulating bearing 200.

[0078] As shown in Figure 2 The present application relates to a kind of direct-current brushless outer rotor motor, transmission shaft 100 can receive insulating bearing 200, insulating bearing 200 can make transmission shaft 100 rotate around its central axis.When transmission shaft 100 in magnetic field environment, the electromotive force of the two ends of transmission shaft 100 will be generated, connecting sleeve 130 can be used as the component of connecting spline shaft 110 and heat dissipation driving shaft 120, when connecting sleeve 130 is metal material, the electromotive force of the two ends of transmission shaft 100 is larger, rotating transmission shaft 100 reduces the magnetic flux leakage of motor. Transmission shaft 100 reduces the magnetic flux leakage by reducing the magnetic flux leakage, generates electromotive force, reduces the influence of the heat accumulation of motor magnetic flux leakage in fixed shell 600, tail sleeve shell 300 due to electromagnetic eddy current, in the alternating magnetic field of motor, the magnetic flux leakage of motor exists in the form of electromotive force of transmission shaft 100.

[0079] The shaft current generated by high-frequency pulse voltage is easy to pass through bearing, causing electric corrosion of bearing. Electromotive force generally does not cause electric corrosion before current is generated, but increases the oxidation of transmission shaft 100 itself.

[0080] In one embodiment of the present application, the transmission shaft 100 includes the spline shaft 110, the heat dissipation driving shaft 120 and the connecting sleeve 130, the spline shaft 110 is arranged inside the connecting sleeve 130, the spline shaft 110 is fixedly connected with the connecting sleeve 130, the heat dissipation driving shaft 120 is arranged inside the connecting sleeve 130, and the heat dissipation driving shaft 120 is fixedly connected with the connecting sleeve 130.

[0081] The material of the tail sleeve shell 300 is metal. The metal material includes one or more of iron, aluminum and silver.

[0082] The insulation bearing 200 includes a first bearing 210 and a second bearing 220, the first bearing 210 is sleeved on the heat dissipation driving shaft 120, the second bearing 220 is sleeved on the heat dissipation driving shaft 120, the first bearing 210 is arranged close to the connecting sleeve 130, and the first bearing 210 is arranged between the second bearing 220 and the connecting sleeve 130.

[0083] The tail sleeve shell 300 is sleeved on the outer circumferential surface of the first bearing 210, and the tail sleeve shell 300 is sleeved on the outer circumferential surface of the second bearing 220.

[0084] The alternating stator 400 is sleeved on the outer circumferential surface of the tail sleeve shell 300.

[0085] The permanent magnet part 500 includes at least two sub-magnets 510, each of the sub-magnets 510 has the same structure, the sub-magnets 510 are arranged at equal distances around the central axis of the heat dissipation driving shaft 120, and the sub-magnets 510 are arranged close to the outer circumferential wall of the alternating stator 400.

[0086] The fixing shell 600 is attached to the outer circumferential wall of the sub-magnet 510, the top of the fixing shell 600 is provided with a through hole 610, the connecting sleeve 130 and the through hole 610 are in mutual resistance, and the connecting sleeve 130 and the through hole 610 are fixedly connected.

[0087] It can be understood that the insulation bearing 200 is arranged between the transmission shaft 100 and the tail sleeve shell 300, since the insulation bearing 200 is insulated, in the case that the transmission shaft 100 has an electromotive force at both ends, the insulation bearing 200 prevents the formation of an electric circuit between the transmission shaft 100 and the tail sleeve shell 300, reduces the probability of heat generation between metal conductors due to current, and prevents the accumulation of heat.

[0088] In the embodiment, excessive temperature can cause demagnetization of the permanent magnet and aging of the winding insulation. When the magnetic flux leakage is reduced, the heat generation of the motor is reduced. The demagnetization of the permanent magnet is reduced, and the aging of the winding insulation is weakened.

[0089] The outer circumferential surface of the outer rotor is difficult to open a heat dissipation groove due to dynamic balance problems. When the fixing shell 600 and the permanent magnet part 500 are fixed, a rotating gradient magnetic field can be generated, and the outer circumferential surface of the outer rotor can be opened to increase the heat dissipation effect.

[0090] The shaft current generated by the high-frequency pulse voltage is easy to pass through the bearing, causing bearing corrosion. When the enameled wire passes through various waveform analog currents or various types of on-off current, the alternating stator 400 can generate a magnetic field, and the alternating stator 400 can generate an alternating magnetic field after the enameled wire passes through various waveform analog currents.

[0091] AsFigures 1 to 2 As shown in the embodiment of the present application, the transmission shaft 100 comprises a spline shaft 110, a heat-dissipation driving shaft 120 and a connecting sleeve 130, the spline shaft 110 is arranged inside the connecting sleeve 130, the spline shaft 110 is fixedly connected with the connecting sleeve 130, the heat-dissipation driving shaft 120 is arranged inside the connecting sleeve 130, and the heat-dissipation driving shaft 120 is fixedly connected with the connecting sleeve 130.

[0092] The insulating bearing 200 comprises a first bearing 210 and a second bearing 220, the first bearing 210 is sleeved on the heat-dissipation driving shaft 120, the second bearing 220 is sleeved on the heat-dissipation driving shaft 120, the first bearing 210 is arranged close to the connecting sleeve 130, and the first bearing 210 is arranged between the second bearing 220 and the connecting sleeve 130.

[0093] The tail sleeve shell 300 is sleeved on the outer circumferential surface of the first bearing 210, and the tail sleeve shell 300 is sleeved on the outer circumferential surface of the second bearing 220. The material of the tail sleeve shell 300 is metal, and the metal material comprises one or more of iron, aluminum and silver.

[0094] The tail sleeve shell 300 comprises a tail sleeve disc and a collar column 320. The central axis of the tail sleeve disc and the central axis of the collar column 320 coincide with each other. The collar column 320 and the collar column 320 are fixedly connected with each other. The collar column 320 is sleeved on the outer circumferential surface of the insulating bearing 200. The collar column 320 comprises a first part 321, a second part 322 and a third part 323. The first part 321, the second part 322 and the third part 323 are fixedly connected in sequence. The outer diameter of the first part 321 is smaller than the outer diameter of the second part 322. The outer diameter of the second part 322 is smaller than the outer diameter of the third part 323. The inner diameter of the first part 321 is larger than the inner diameter of the second part 322. The inner diameter of the second part 322 is smaller than the inner diameter of the third part 323. The first part 321 is sleeved on the outer circumferential surface of the first bearing 210. The third part 323 is sleeved on the outer circumferential surface of the second bearing 220.

[0095] The alternating stator 400 is sleeved on the outer circumferential surface of the tail sleeve shell 300.

[0096] The permanent magnet part 500 comprises at least two sub-magnets 510, each of the sub-magnets 510 has the same structure, the sub-magnets 510 are arranged at equal distances in a circle around the central axis of the heat-dissipation driving shaft 120, and the sub-magnets 510 are arranged close to the outer circumferential wall of the alternating stator 400.

[0097] A fixed shell 600 is attached to the outer peripheral wall of the magnet 510. A through hole 610 is provided on the top of the fixed shell 600. The connecting sleeve 130 abuts against the through hole 610 and is fixedly connected to the through hole 610.

[0098] Understandably, the insulating bearing 200 is positioned between the transmission shaft 100 and the tail sleeve housing 300. Since the insulating bearing 200 is insulating, when there is an electromotive force at both ends of the transmission shaft 100, the insulating bearing 200 prevents the formation of an electrical circuit between the transmission shaft 100 and the tail sleeve housing 300, reduces the probability of electric heating generated between the metal conductors due to current, and prevents the accumulation of electric heat.

[0099] The alternating stator 400 can be wound with a relatively thin enameled wire. When various waveforms of analog current or various types of switching current are passed through the enameled wire, the alternating stator 400 can generate a magnetic field. When various waveforms of analog current are passed through the enameled wire, the alternating stator 400 can generate an alternating magnetic field. When various types of switching current are passed through the enameled wire, the alternating stator 400 can generate an alternating magnetic field. The alternating magnetic field will generate electric heat in the metal transmission shaft 100, the metal tail sleeve 300, and the metal fixed shell 600.

[0100] In one embodiment of this application, the first bearing 210 and the second bearing 220 have the same structure. The first bearing 210 and the second bearing 220 are made of the same material.

[0101] The first bearing 210 includes steel balls 211, an inner shell 212, and an outer shell 213. The steel balls 211 are disposed between the inner shell 212 and the outer shell 213. The inner shell 212 wall of the outer shell 213 abuts against the outer peripheral wall of the outer shell 213. The inner shell 212 wall of the inner shell 212 abuts against the outer peripheral wall of the heat dissipation drive shaft 120.

[0102] The inner shell 212 is made of a non-metallic material. The outer shell 213 is made of a non-metallic material.

[0103] Understandably, non-metallic materials such as silicon can increase the breakdown voltage of the electromotive force.

[0104] like Figures 2 to 4 As shown, in this embodiment, the alternating stator 400 can be wound with a relatively thin enameled wire. When various waveforms of analog current or various types of switching current are passed through the enameled wire, the alternating stator 400 can generate a magnetic field. After various waveforms of analog current are passed through the enameled wire, the alternating stator 400 can generate an alternating magnetic field. When various types of switching current are passed through the enameled wire, the alternating stator 400 can generate an alternating magnetic field. The alternating magnetic field will generate electric heat in the metal transmission shaft 100, the metal tail sleeve 300, and the metal fixing shell 600.

[0105] The alternating magnetic field generated by the alternating stator 400 interacts with the fixed magnetic field of the permanent magnet part 500, and the transmission shaft 100 can rotate around its central axis. When the transmission shaft 100 rotates, the transmission shaft 100 can realize the leakage magnetic acquisition of the alternating magnetic field, which greatly reduces the leakage of the alternating magnetic field and reduces the heat generation of the motor. The fixed shell 600 is attached to the outer peripheral wall of the magnetic body 510. When the transmission shaft 100 drives the fixed shell 600 to rotate, the permanent magnet part 500 includes at least two magnetic bodies 510. The magnetic bodies 510 are arranged at equal intervals around the central axis of the heat dissipation driving shaft 120. The magnetic bodies 510 are arranged close to the outer peripheral wall of the alternating stator 400. The fixed magnetic field generated by the permanent magnet part 500 becomes a rotating gradient magnetic field. The magnetic density of the rotating gradient magnetic field is relatively good, and the occurrence of magnetic leakage can be reduced.

[0106] It is apparent for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application.

[0107] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. A DC brushless external rotor motor, characterized in that, include: The transmission shaft includes a splined shaft, a heat dissipation drive shaft, and a connecting sleeve. The splined shaft is disposed inside the connecting sleeve and is fixedly connected to the connecting sleeve. The heat dissipation drive shaft is disposed inside the connecting sleeve and is fixedly connected to the connecting sleeve. The connecting sleeve is made of metal. An insulated bearing includes a first bearing and a second bearing. The first bearing is sleeved on the heat dissipation drive shaft, and the second bearing is sleeved on the heat dissipation drive shaft. The first bearing is located close to the connecting sleeve and is positioned between the second bearing and the connecting sleeve. The insulated bearing has an anti-electro-corrosion structure, which includes an inner ring, an outer ring, and a brush. The inner and outer rings are concentric annular rings, with the outer ring located outside the inner ring and a gap between them. The brush is embedded in the outer ring, connecting the inner and outer sides of the outer ring, with the inner side of the brush in contact with the inner ring. The anti-electro-corrosion structure is located on one side of the bearing. The inner ring is interference-fitted with the heat dissipation drive shaft. The outer ring is fixed to the tail sleeve housing by bearing compression. During motor operation, the inner ring rotates together with the transmission shaft and forms an electrical circuit through the brush head contacting the brush. The outer ring has several radially distributed holes, and the brush is located within these holes. A tail sleeve is fitted onto the outer circumferential surface of the first bearing, and the tail sleeve is fitted onto the outer circumferential surface of the second bearing; the tail sleeve is made of metal. An alternating stator is fitted onto the outer circumferential surface of the tail sleeve. The permanent magnet section includes at least two sub-magnets, each of which has the same structure. The sub-magnets are arranged equidistantly around the central axis of the heat dissipation drive shaft and are located close to the outer peripheral wall of the alternating stator. A fixed shell is attached to the outer peripheral wall of the magnet separator. A through hole is provided on the top of the fixed shell. The connecting sleeve abuts against the through hole and is fixedly connected to the through hole.

2. The DC brushless external rotor motor according to claim 1, characterized in that, The metallic material includes one or more of iron, aluminum, and silver.

3. The DC brushless external rotor motor according to claim 2, characterized in that, The tail sleeve includes a tail ring disc and a shaft collar column; The central axis of the tail ring disk and the central axis of the ring post coincide with each other; The collar post and the collar post are fixedly connected to each other.

4. The DC brushless external rotor motor according to claim 3, characterized in that, The collar post is sleeved on the outer circumferential surface of the insulated bearing.

5. The DC brushless external rotor motor according to claim 4, characterized in that, The collar post includes a first section, a second section, and a third section; The first part, the second part, and the third part are fixedly connected in sequence; The outer diameter of the first portion is smaller than the outer diameter of the second portion; The outer diameter of the second part is smaller than the outer diameter of the third part.

6. The brushless DC external rotor motor according to claim 5, characterized in that, The inner diameter of the first portion is larger than the inner diameter of the second portion; The inner diameter of the second section is smaller than the inner diameter of the third section.

7. The DC brushless external rotor motor according to claim 6, characterized in that, The first portion is fitted onto the outer circumferential surface of the first bearing; The third part is fitted onto the outer circumferential surface of the second bearing.

8. The DC brushless external rotor motor according to claim 7, characterized in that, The first bearing has the same structure as the second bearing; The first bearing is made of the same material as the second bearing.

9. The DC brushless external rotor motor according to claim 8, characterized in that, The first bearing includes steel balls, an inner shell, and an outer shell; The steel ball is disposed between the inner shell and the outer shell; The inner shell wall of the outer casing abuts against the outer peripheral wall of the outer casing; The inner shell wall of the inner shell abuts against the outer peripheral wall of the heat dissipation drive shaft.

10. The DC brushless external rotor motor according to claim 9, characterized in that, The inner shell is made of a non-metallic material; The outer shell is made of a non-metallic material.

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