WO2023273560A1

WO2023273560A1 - Outer rotor motor

Info

Publication number: WO2023273560A1
Application number: PCT/CN2022/088895
Authority: WO
Inventors: 李海兵; 缪小兵; 徐斌; 封阳春; 马英健
Original assignee: 江苏瑞力泰铁路科技有限公司
Priority date: 2021-06-30
Filing date: 2022-04-25
Publication date: 2023-01-05
Also published as: CN113258740A

Abstract

The present invention relates to a motor, in particular an outer rotor motor, which comprises: a casing the top part of which is provided with an air outlet hole, a top cover and a bottom cover that are fixed at both ends of the casing, a stator, a rotor, and a filter that is mounted on the bottom cover; the stator comprises a stator core, a winding and a stator frame, the stator frame being fixed on the bottom cover, and the winding being fixed on the stator frame by means of the stator core; the rotor comprises a permanent magnet, a rotating ring, a fan blade, and a motor shaft, wherein an annular array of the permanent magnet is fixed on an inner circular surface of the rotating ring and is disposed opposite to the stator core, the motor shaft is fixed at the top part of the rotating ring by means of the fan blade, the motor shaft is rotatably connected to the stator frame and the top cover, and the fan blade being disposed opposite to the air outlet hole and is disposed around an annular array of the motor shaft; and the filter is fixed on the bottom cover and filters air that enters an air intake hole on the bottom cover. In the outer rotor motor, the interior of the motor is cooled by means of a fan blade and iron powder is removed by means of a filter, and the motor can continuously and stably work for a long time, has a small volume, a light weight, and a long service life.

Description

Outer rotor motor

technical field

The invention relates to an electric machine, especially an external rotor electric machine.

Background technique

When laying or maintaining rails, it is necessary to cut the rails. Since it is mainly used in the field, the cutting machine mostly uses a lithium electric cutting machine. Because the thickness of the rails is thick, the cutting power required is relatively large. In order to meet the cutting requirements, the existing motors It is a high-power motor, and it is an inner rotor motor. In order to prevent the iron powder generated by cutting from entering the inside of the motor, the motor adopts a closed structure, but the high-power motor generates a lot of heat and the temperature of the motor is high. Heat sink, the heat sink further increases the volume and weight, and due to the large heat generated by the motor, the heat dissipation effect of the heat sink is limited, and the temperature of the motor rises faster. When the temperature is high, the performance of the motor will decrease, and the power provided will decrease. , lead to longer cutting time, further lead to motor temperature rise, easy to enter a vicious cycle state, make the motor work at high temperature for a long time, long time high temperature will cause permanent damage to the motor, greatly shorten the service life of the motor, and performance decline Afterwards, work efficiency is affected.

Due to the large volume and weight of the motor, the overall weight of the lithium electric cutting machine is relatively large, which is inconvenient to use and increases the labor intensity.

Contents of the invention

In order to solve the above problems, the present invention provides an external rotor motor that can be forced to be air-cooled, can work continuously for a long time, is small in size, light in weight, easy to use, and has a long service life. The specific technical solution is:

The outer rotor motor includes: a casing with an air outlet on the top, a top cover and a bottom cover fixed at both ends of the casing, a stator, a rotor, and a filter mounted on the bottom cover; the stator includes a stator iron Core, winding and stator frame, the stator frame is fixed on the bottom cover, the winding is fixed on the stator frame through the stator core; the rotor includes a permanent magnet, a rotating ring, fan blades and a motor shaft, the permanent magnet annular array is fixed on the inner surface of the rotating ring, and is arranged opposite to the stator core, the motor shaft is fixed on the top of the rotating ring through the fan blades, and the The motor shaft is rotatably connected to the stator frame and the top cover respectively, and the fan blades are arranged opposite to the air outlet holes and arranged in a circular array around the motor shaft; the filter is fixed on the bottom cover On, filter the air entering the air intake holes on the bottom cover.

By adopting the above technical scheme, the fan blades are integrated on the rotor to realize synchronous rotation. The fan blades discharge hot air through the air outlet holes on the casing. To dissipate heat, keep the winding at a lower temperature, and then work stably for a long time. The filter filters iron powder and sundries to avoid damage to the motor.

Because the diameter of the rotor of the outer rotor motor is larger than that of the traditional inner rotor, that is, the force arm is larger, it can output a larger torque and reduce the size and weight of the motor.

Preferably, it also includes: a connecting shaft, the connecting shaft is installed on the stator frame through the second bearing and the third bearing, and is connected with the motor shaft; the motor shaft is installed on the top through the first bearing cover.

By adopting the above technical solution, the connecting shaft runs through the entire stator, the stability is better, the radial bearing capacity of the motor shaft is improved, and the motor shaft can rotate stably on the axis.

Preferably, the connecting shaft is mounted on the bottom cover through a fourth bearing.

The connecting shaft is also positioned through the bottom cover, which has better stability and can ensure the concentricity between the stator and the rotor during assembly, making assembly more convenient and improving assembly efficiency.

Preferably, the stator frame includes a stator fixed plate and a stator column, the stator column is fixed on the stator fixed plate, and the stator fixed plate is mounted on the bottom cover by screws.

By adopting the above technical solution, the fixed plate is used for fixing on the bottom cover, and the stator column is used for installing the stator core, so the structure is stable.

Preferably, the filter includes: a filter plate and a filter cover, the filter plate is installed in the filter cover, the filter cover is installed on the bottom cover through screws, and several filter hole.

By adopting the above technical solution, the filter cover fixes the filter plate, which is convenient for disassembly and replacement of the filter plate.

Further, the filter plate includes several filter screen plates of different meshes, which are arranged in sequence.

By adopting the above technical solution, the multi-layer filtration can not only ensure the filtering effect, but also prolong the service life of the filter plate.

Further, the bottom of the bottom cover is provided with a first positioning ring; the bottom of the filter cover is provided with a second positioning ring, the second positioning ring is set opposite to the first positioning ring, and the filter plate is located The first positioning ring and the second positioning ring.

By adopting the above technical solution, the two positioning rings facilitate fixing the filter plate, so that the filter plate always covers the air inlet hole.

Preferably, a magnetic ring is also included, and the magnetic ring is fixed in the filter cover and located between the filter plate and the bottom cover.

By adopting the above technical solution, the magnetic ring can magnetically absorb tiny iron powder passing through the filter screen plate, so as to protect the motor and prolong the maintenance time of the motor.

Preferably, the casing is cylindrical, and several mounting seats are provided on the outer surface of the casing.

By adopting the above-mentioned technical solution, the installation seat is convenient for installing other components.

Compared with the prior art, the present invention has the following beneficial effects:

The outer rotor motor provided by the present invention cools the inside of the motor through fan blades, and removes iron powder through a filter. It can work continuously and stably for a long time. The motor has high efficiency, small volume, light weight and long service life. Moreover, it is convenient to use and reduces labor intensity.

Description of drawings

Fig. 1 is a structural schematic diagram of an outer rotor motor;

Fig. 2 is a sectional view of the outer rotor motor;

Fig. 3 is the bottom view of the outer rotor motor;

Fig. 4 is a schematic diagram of an explosion structure of an outer rotor motor;

Fig. 5 is a schematic structural view of the bottom cover;

Fig. 6 is a schematic structural view of the rotor;

Fig. 7 is a schematic structural view of the stator frame;

Fig. 8 is a schematic structural view of the filter cap.

detailed description

The present invention will be further described now in conjunction with accompanying drawing.

As shown in FIGS. 1 to 8 , the external rotor motor includes a casing 11 , a top cover 12 , a bottom cover 13 , a stator 2 , a rotor 3 or a filter 4 . The top cover 12 and the bottom cover 13 are fixed on the mounting seat 111 of the casing 11 by screws, and are coaxial with the casing 11. The top of the casing 11 connected with the top cover 12 is provided with several air outlet holes 112, and the air outlet The hole 112 is an elongated hole. The casing 11 is cylindrical, and the wall thickness of the casing 11 can be made thinner, such as a wall thickness of 2-6mm, which can effectively reduce the weight, and the mounting seat 111 is convenient for installing the top cover 12 and the bottom cover 13, At the same time, the strength of the casing 11 can be improved, and the mounting base 111 can also be connected with other parts of the cutting machine, so that the assembly of the motor is convenient. Mounting base 111 is provided with fixing through-hole 113, and fixing through-hole 113 can reduce the weight of installing base 111, and the two ends of fixing through-hole 113 are provided with internal thread, conveniently fix top cover 12 and bottom cover 13 by screw.

The casing 11 can be made of aluminum profile, with light weight and good heat dissipation performance.

The top cover 12 and the bottom cover 13 are also made of aluminum, which is light in weight, thereby reducing the weight of the motor.

As shown in Figures 2 and 3, the stator 2 includes a stator core 21, a winding 20 and a stator frame 22, the stator frame 22 is fixed on the bottom cover 13 by screws, and the winding 20 is fixed on the stator frame 22 through the stator core 21, The winding 20 of the stator core 21 is the stator 2, which can reduce volume and weight.

As shown in FIG. 2 and FIG. 7 , the stator frame 22 includes a stator fixing plate 222 and a stator column 221 , the stator column 221 is fixed on the stator fixing plate 222 , and the stator fixing plate 222 is mounted on the bottom cover 13 by screws. The stator fixing plate 222 is used to connect with the bottom cover 13 to facilitate installation, and the stator column 221 is used to install the stator core 21, so the structure is stable.

The rotor 3 includes a permanent magnet 33 , a rotating ring 30 , fan blades 31 and a motor shaft 32 . The permanent magnets 33 are fixed in an annular array on the inner surface of the rotating ring 30 and opposite to the stator core 21 . The rotating ring 30, the fan blades 31 and the motor shaft 32 are integral structures, the motor shaft 32 is coaxially arranged with the rotating ring 30, the fan blades 31 are positioned at the top of the rotating ring 30, the motor shaft 32 is positioned at the top of the fan blades 31, and the fan blades 31 It is arranged opposite to the air outlet hole 112 and arranged in an annular array around the motor shaft 32;

The motor shaft 32 is installed on the top cover 12 through the first bearing 25, and can also be connected with the stator frame 22 through the bearing.

Since the rotor 3 of the outer rotor motor is sleeved on the stator 2, the diameter of the rotor 3 of the outer rotor 3 is larger than that of the inner rotor motor of the same size, and the outer rotor motor can provide greater output torque. Among them, the outer rotor motor can provide more torque without changing the volume, so the diameter of the outer rotor motor can be smaller, the structure is more compact, and the weight is lighter under the condition of outputting the same torque.

In some embodiments, as shown in FIG. 2 , the motor shaft 32 is rotatably connected to the stator frame 22 through the connecting shaft 23, wherein the stator frame 22 includes a stator fixed plate 222 and a stator post 221, and the stator post 221 is fixed on the stator fixed plate. 222 , the stator column 221 and the stator fixing plate 222 are integral structures, and the stator fixing plate 222 is mounted on the bottom cover 13 by screws. The two ends of the stator column 221 are equipped with a second bearing 26 and a third bearing 27 respectively, and a backing ring 24 is also installed between the second bearing 26 and the third bearing 27, and the backing ring 24 is connected with the second bearing 26 and the third bearing. 27 inner ring contacts. The connecting shaft 23 is installed on the second bearing 26 and the third bearing 27, and is fixedly connected with the motor shaft 32, and is coaxial.

The connecting shaft 23 runs through the entire stator 2, which has better stability, improves the radial bearing capacity of the motor shaft 32, and enables the motor shaft 32 to rotate stably on the axis.

In some embodiments, the connecting shaft 23 is also installed on the bottom cover 13 through the fourth bearing 28, the fourth bearing 28 can improve the concentricity between the connecting shaft 23 and the stator 2, and improve the stability of the connecting shaft 23, reducing the diameter. Axis shift due to axial force.

The connecting shaft 23 is also positioned through the bottom cover 13, which has better stability and can ensure the concentricity between the stator 2 and the rotor 3 during assembly, making assembly more convenient and improving assembly efficiency.

Bottom cover 13 is provided with several air inlet holes 132, and filter 4 is fixed on the bottom cover 13, is used for filtering air, prevents other sundry after iron powder from entering the inside of motor, protects motor. The air inlet holes 132 are arc-shaped holes and are arranged in an annular array. An outlet hole 133 is also provided at the edge of the bottom cover 13 for inserting wires. The outlet hole 133 is equipped with a rubber ring, and the rubber ring realizes the sealing between the wire and the outlet hole 133, preventing air from entering the inside of the motor from the outlet hole 133 without filtering.

As shown in Figures 2 and 4, the filter 4 includes: a filter plate and a filter cover 40, the filter plate is movably installed in the filter cover 40, the filter cover 40 is installed on the bottom cover 13 by screws, and the filter cover 40 is provided with several filter holes 402, and the filter holes 402 are arranged in an annular array. The filter cover 40 fixes the filter plate, which is convenient for disassembly and replacement of the filter plate.

One side of the filter cover 40 is provided with a wire passing slot 403 , and the wire passing slot 403 is arranged opposite to the wire outlet hole 133 .

The filter plate can be replaced according to the usage conditions to ensure good air intake performance and reliable heat dissipation. The filter cover 40 is installed on the bottom cover 13 by screws for easy disassembly and assembly, and is convenient for replacing the filter plate.

The filter plate includes several filter screen plates with different mesh numbers, which are arranged in sequence. Specifically, it includes three layers of filter screens, from the filter cover 40 to the bottom cover 13, there are coarse filter screens 41, medium filter screens 42 and fine filter screens 43, which are filtered step by step to ensure the filtering effect and improve the The service life of the filter screen plate is reduced, and the replacement frequency is reduced.

The bottom of the bottom cover 13 is provided with a first positioning ring 131;

The bottom of the filter cover 40 is provided with a second positioning ring 401 , the second positioning ring 401 is arranged opposite to the first positioning ring 131 , and the filter screen is located in the first positioning ring 131 and the second positioning ring 401 .

The first positioning ring 131 and the second positioning ring 401 can limit the position of the filter plate, so that the filter plate always covers the air inlet hole 132, and no position deviation occurs, so that the air entering the motor is filtered through the filter plate, effectively protecting motor.

In some embodiments, as shown in FIG. 2 and FIG. 4 , a magnetic ring 43 is further included, and the magnetic ring 43 is fixed in the filter cover 40 and located between the filter plate and the bottom cover 13 . The magnetic ring can be located between the fine filter screen plate 43 and the bottom cover 13, or between the medium filter screen plate 42 and the fine filter screen plate 43, when between the medium filter screen plate 42 and the fine filter screen plate 43, it can Shock absorption is performed to prevent the magnetic ring 43 from colliding with the bottom cover 13 due to vibration, so as to protect the magnetic ring 43 .

The magnetic ring 43 can absorb the tiny iron powder passing through the filter screen by magnetic force, so as to protect the motor and prolong the maintenance time of the motor. The mesh size of the filter screen should not be too small, otherwise it will cause large wind resistance, difficult air suction, and poor heat dissipation, so the iron powder with a small diameter cannot be filtered, and the iron powder will gather on the permanent magnet 33 when it enters the motor , affect the work, so it needs to be cleaned regularly, and the magnetic ring 43 can effectively prevent the fine iron powder from entering the inside of the motor, prolong the cleaning time of the motor, and can effectively reduce the failure of the motor, reduce the frequency of maintenance, and is easy to use.

The fan blade 31 is integrated on the rotor 3 to realize synchronous rotation. The fan blade 31 discharges the hot air through the air outlet 112 on the casing 11. Part 2 conducts heat dissipation to keep the winding 20 at a lower temperature, thereby stably performing continuous work for a long time, and the filter 4 filters iron powder and sundries to avoid damage to the motor.

The above describes the technical principles of the present invention in conjunction with specific embodiments. These descriptions are only for explaining the principles of the present invention, and cannot be construed as limiting the protection scope of the present invention in any way. Based on the explanations herein, those skilled in the art can think of other specific implementation modes of the present invention without creative work, and these modes will all fall within the protection scope of the claims of the present invention.

Claims

The outer rotor motor is characterized in that it includes: a casing with an air outlet on the top, a top cover and a bottom cover fixed at both ends of the casing, a stator, a rotor, and a filter installed on the bottom cover;

The stator includes a stator core, a winding and a stator frame, the stator frame is fixed on the bottom cover, and the winding is fixed on the stator frame through the stator core;

The rotor includes permanent magnets, a rotating ring, fan blades and a motor shaft. The annular array of permanent magnets is fixed on the inner circular surface of the rotating ring and is arranged opposite to the stator core. The motor shaft passes through the The fan blade is fixed on the top of the rotating ring, and the motor shaft is respectively connected to the stator frame and the top cover in rotation. Circular array setup;

The filter is fixed on the bottom cover to filter the air entering the air inlet hole on the bottom cover.
The outer rotor motor according to claim 1, further comprising: a connecting shaft, the connecting shaft is installed on the stator frame through a second bearing and a third bearing, and is connected to the motor shaft;

The motor shaft is mounted on the top cover through a first bearing.
The outer rotor motor according to claim 2, wherein the connecting shaft is mounted on the bottom cover through a fourth bearing.
The outer rotor motor according to any one of claims 1 to 3, wherein the stator frame includes a stator fixed plate and a stator post, the stator post is fixed on the stator fixed plate, and the stator fixed plate Installed on the bottom cover by screws.
The external rotor motor according to any one of claims 1 to 3, wherein the filter comprises: a filter plate and a filter cover, the filter plate is installed in the filter cover, and the filter cover is screwed Installed on the bottom cover, the filter cover is provided with several filter holes.
The outer rotor motor according to claim 5, wherein the filter plate includes several filter screen plates with different meshes, which are arranged in sequence.
The outer rotor motor according to claim 5, characterized in that, the bottom of the bottom cover is provided with a first positioning ring;

The bottom of the filter cover is provided with a second positioning ring, the second positioning ring is opposite to the first positioning ring, and the filter plate is located in the first positioning ring and the second positioning ring.
The outer rotor motor according to claim 5, further comprising a magnetic ring, the magnetic ring is fixed in the filter cover and located between the filter plate and the bottom cover.
The outer rotor motor according to claim 1, wherein the casing is cylindrical, and several mounting seats are provided on the outer surface of the casing.