CN210431046U - Rotor unit of outer rotor motor split type sealing design - Google Patents
Rotor unit of outer rotor motor split type sealing design Download PDFInfo
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- CN210431046U CN210431046U CN201921570211.3U CN201921570211U CN210431046U CN 210431046 U CN210431046 U CN 210431046U CN 201921570211 U CN201921570211 U CN 201921570211U CN 210431046 U CN210431046 U CN 210431046U
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Abstract
The utility model relates to a split type sealed rotor unit of design of external rotor electric machine, including external rotor and rotor magnet steel, rotor magnet steel circumference interval arrangement is in the external rotor, and the external rotor is equipped with the installing port in the position department of external rotor electric machine center of rotation axle, can dismantle on the installing port and seal there is the installation end cover. When the internal damage of external rotor needs to be maintained, only need through opening the installation end cover, can follow the installing port and contact the external rotor inside, and then can maintain or change external rotor inside, this application uses above-mentioned mode, need not to carry out whole dismantlement to this external rotor electric machine, and it is high to have improved the maintenance convenience.
Description
Technical Field
The utility model belongs to the technical field of the technique of motor and specifically relates to a rotor unit of split type sealed design of external rotor electric machine is related to.
Background
Currently, ac motors have become the most widely used power devices. However, due to the limitations of mechanical installation space, precision and other conditions, in various practical applications, corresponding transmission and braking devices, such as gear sets, belt pulleys and other components, need to be matched, so that the size and the weight are large, and the reliability is low and the service life is short due to mechanical vibration or abrasion, and frequent maintenance is required.
The wheel hub motor, namely the motor arranged in the wheel, has the greatest characteristic that power, transmission and braking devices are integrated into the wheel hub, so that the mechanical part of electric transmission is greatly simplified, and the wheel hub motor becomes a mainstream power device on new energy automobiles, balance cars, electric bicycles, mobile robots and the like. In addition, the hub motor has the advantages of high power density and energy transmission efficiency, large output torque, fast dynamic response, high control progress, no influence of oil, dust and other pollutants on work, high reliability, low failure rate, convenience in maintenance and the like.
The mature application of the hub motor cannot be promoted by the advanced drive control technology, and the control modes of the hub motor are various and the general modes are as follows: six-step square wave control, sine control, vector directional control and direct torque control. In either case, it is necessary to detect the rotational speed and angular position of the motor in real time for accurate speed and position control. The current mainstream position detection is to use a photoelectric encoder or a hall sensor mounted on a motor to obtain the rotating speed and position information of the motor. However, the photoelectric encoder has high cost, is easy to damage, has high requirements on the environment, and is easily influenced by oil stains and dust. Therefore, the magnetic induction encoder makes up the defects of the photoelectric encoder, and has the advantages of high precision, small size, shock resistance, corrosion resistance, pollution resistance, high performance reliability, simple structure, low cost and the like.
At present, chinese patent publication No. CN206432854U discloses a hub motor, in which a stator unit includes a stator main shaft and a stator armature winding fixedly mounted on the stator main shaft, a rotor unit includes a rotor subunit and a rotor magnetic steel, the rotor subunit and the stator main shaft are connected together in a relatively rotatable manner, a magnetic induction encoder is mounted on an end surface of the stator main shaft, the position of the magnetic induction magnetic steel is opposite to the magnetic induction encoder, and the magnetic induction magnetic steel is fixed on the rotor unit. The magnetic induction encoder is applied to the hub motor in the mode.
However, since the rotor unit is arranged as a closed chamber, when the magnetic induction encoder is damaged for maintenance, a worker is often required to detach the whole hub motor, and then detach the stator unit from the rotor unit to maintain the magnetic induction encoder on the end face of the stator spindle, so that the maintenance convenience is low, and therefore, certain improvement is provided.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a rotor unit of split type sealed design of external rotor electric machine can improve the maintenance convenience to a certain extent.
The above technical purpose of the present invention can be achieved by the following technical solutions:
the rotor unit comprises an outer rotor and rotor magnetic steel, wherein the rotor magnetic steel is circumferentially arranged in the outer rotor at intervals, an installation opening is formed in the position of the outer rotor at a rotating central shaft of the outer rotor motor, and an installation end cover is detachably sealed on the installation opening.
Through above-mentioned technical scheme, when the internal damage of external rotor need be maintained, only need through opening the installation end cover, can follow the installing port and contact the external rotor inside, and then can maintain or change the external rotor inside, this application uses above-mentioned mode, need not to carry out whole dismantlement to this external rotor electric machine, and it is high to have improved the maintenance convenience.
Preferably, the outer rotor comprises a rotor housing, a first end cover and a second end cover;
rotor magnet steel circumference interval arrangement is on rotor case's inner wall, first end cover and second end cover pass through the screw installation on rotor case, the installing port sets up on first end cover or second end cover.
Through above-mentioned technical scheme, first end cover and second end cover pass through the screw installation on rotor housing, from this, first end cover and second end cover have detachable function on rotor housing to further improve this external rotor electric machine's maintenance convenience.
Preferably, a first O-shaped sealing ring is compressed between the first end cover and the rotor shell.
Through above-mentioned technical scheme, setting up of first O type sealing washer has improved the leakproofness between first end cover and the rotor housing, avoids inside external oil stain or the dust enters into the rotor housing.
Preferably, a second O-shaped sealing ring is compressed between the second end cover and the rotor shell.
Through above-mentioned technical scheme, setting up of second O type sealing washer has improved the leakproofness between second end cover and the rotor housing, avoids inside external oil stain or the dust enters into the rotor housing.
Preferably, the mounting end cover is mounted on the mounting opening through a screw.
Through above-mentioned technical scheme, the mode that the installation end cover passes through the screw installation, and installation stability is good to leakproofness between installation end cover and the installing port is high.
Preferably, a third O-shaped sealing ring is compressed between the mounting end cover and the mounting opening.
Through above-mentioned technical scheme, the setting of third O type sealing washer has further improved the leakproofness between installation end cover and the installing port.
Preferably, a non-magnetic-conductive mounting sleeve is fixed on the inner wall surface of the mounting end cover, the mounting sleeve is positioned on a rotating central shaft of the outer rotor motor, and the mounting sleeve is internally provided with induction magnetic steel.
Through above-mentioned technical scheme, the installation cover adopts the material of non-magnetic conduction to make, and the setting of response magnet steel is sheathe in the installation, and the installation cover forms the installation encirclement to the response magnet steel, has played the effect of keeping apart external magnetic field.
Preferably, the position of the outer wall surface of the mounting end cover opposite to the induction magnetic steel is provided with an isolation iron sheet.
Through above-mentioned technical scheme, the setting of keeping apart the iron sheet can keep apart external magnetic field, prevents that external magnetic field from disturbing this external rotor electric machine inside magnetic induction encoder.
To sum up, the utility model discloses a beneficial technological effect does:
when the internal damage of external rotor needs to be maintained, only need through opening the installation end cover, can follow the installing port and contact the external rotor inside, and then can maintain or change external rotor inside, this application uses above-mentioned mode, need not to carry out whole dismantlement to this external rotor electric machine, and it is high to have improved the maintenance convenience.
Drawings
Fig. 1 is a schematic view of the overall structure of an external rotor motor in the technical scheme of the present invention;
fig. 2 is a sectional view of an outer rotor motor in the technical scheme of the utility model;
fig. 3 is a schematic structural view of an installation end cover in the technical scheme of the invention;
fig. 4 is a schematic diagram of a first explosion of an outer rotor motor according to the technical solution of the present invention;
fig. 5 is a schematic diagram of a second explosion of the outer rotor motor in the technical solution of the present invention;
fig. 6 is an installation schematic diagram of the transfer board in the technical scheme of the present invention.
Reference numerals: 1. a stator unit; 101. a stator main shaft; 102. a stator armature winding; 103. a main shaft cavity; 2. a rotor unit; 21. an outer rotor; 211. a rotor housing; 212. a first end cap; 213. a second end cap; 22. rotor magnetic steel; 3. a position detection unit; 31. inducing magnetic steel; 32. a magnetic induction encoder; 4. an installation port; 5. installing an end cover; 6. a first O-ring seal; 7. a second O-ring seal; 8. a third O-shaped sealing ring; 9. isolating iron sheets; 10. installing a sleeve; 11. mounting a bracket; 12. an adapter plate; 13. a bearing; 14. a circuit board; 15. welding pins; 16. welding the notch; 17. a positioning column; 18. positioning holes; 19. and (6) oil seal ring.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. Meanwhile, in the present specification, the terms "upper", "lower", "left", "right", "middle", and the like are used for clarity of description only, and are not used to limit the range of the present invention that can be implemented, and changes or adjustments of the relative relationship thereof are considered as the scope of the present invention that can be implemented without substantial technical changes.
Aiming at the technical problem that the maintenance convenience of an in-wheel motor in the prior art is poor, the application provides a rotor unit with an outer rotor motor in a split type sealing design, the rotor unit is applied to the outer rotor motor and is also called as an in-wheel motor, and the outer rotor motor comprises a stator unit 1, a rotor unit 2 and a position detection unit 3, and is shown by combining a figure 1 and a figure 2.
The stator unit 1 comprises a stator main shaft 101 and a stator armature winding 102, the stator armature winding 102 is fixedly installed on the outer surface of the stator main shaft 101, the interior of the stator main shaft 101 is hollow and penetrates through to form a main shaft cavity 103, the main shaft cavity 103 is arranged along the axial direction of the stator main shaft 101, the main shaft cavity 103 penetrates through two ends of the stator main shaft 101, and the main shaft cavity 103 is used for providing installation channels for signal lines and power lines.
The signal line is used for realizing data interaction between the external rotor motor internal position detection unit 3 and external equipment (such as a motor driver). The power lines are used for data interaction with external equipment (such as a motor driver), the power lines penetrate through the main shaft cavity 103 and are connected to the stator armature winding 102, and the power lines provide alternating current for the stator armature winding 102, so that the stator armature winding 102 generates a rotating magnetic field according to the alternating current voltage.
The rotor unit 2 comprises an outer rotor 21 and rotor magnetic steel 22, the outer rotor 21 surrounds the stator armature winding 102 and is rotatably connected to the stator main shaft 101, the rotor magnetic steel 22 is circumferentially arranged on the inner wall of the outer rotor 21 at intervals, the position of the rotor magnetic steel 22 corresponds to the stator armature winding 102, a certain interval exists between the rotor magnetic steel 22 and the stator armature winding 102, and the distribution direction of the rotor magnetic steel 22 is parallel to the rotation central axis of the outer rotor motor.
The motor driver outputs alternating voltage which is transmitted to the stator armature winding 102 through a power line, so that the stator armature winding 102 generates a rotating magnetic field, the magnetic field interacts with the magnetic field generated by the rotor magnetic steel 22 to generate tangential electromagnetic traction force, and the outer rotor 21 and the rotor magnetic steel 22 are dragged to rotate synchronously.
In the present application, as shown in fig. 4 and 5, the outer rotor 21 is provided with a mounting opening 4 at a position of a rotation central axis of the outer rotor motor, that is, the mounting opening 4 is provided at a position of the outer rotor 21 opposite to an end surface of the stator main shaft 101, and a mounting end cover 5 is detachably sealed on the mounting opening 4, and in one embodiment, the mounting end cover 5 is mounted on the mounting opening 4 by screws. In another embodiment, the mounting end cap 5 is mounted on the mounting opening 4 in a clamping manner, the detachable manner of the mounting end cap 5 is specifically set according to actual conditions, and this embodiment is not specifically limited, and only the connection stability between the mounting end cap 5 and the mounting opening 4 needs to be ensured.
Accordingly, when the outer rotor 21 rotates, the induction magnetic steels 31 fixed to the inner wall surface of the mounting end cap 5 also rotate simultaneously, and accordingly, the fixed magnetic field generated by the induction magnetic steels 31 also rotates. The rotating magnetic field is subjected to sine and cosine alternation along with the change of the rotating angle, the magnetic induction encoder 32 opposite to the position of the induction magnetic steel 31 can sense the alternating magnetic field generated by the magnetic induction magnetic steel 31, an electric signal is generated by a Hall effect, angle information, orthogonal coding information and Hall information are generated after the processing, and the angle information, the orthogonal coding information and the Hall information are transmitted to a motor driver through a signal wire, so that the feedback of the position information is realized. In the present embodiment, in order to more accurately acquire the position information of the outer rotor 21, the induction magnetic steel 31 and the magnetic induction encoder 32 are provided at the position of the rotation central axis of the entire outer rotor motor.
It is worth mentioning that, in order to further ensure the maintenance convenience of the external rotor motor. In the present embodiment, the outer rotor 21 includes a rotor housing 211, a first end cover 212, and a second end cover 213. The rotor housing 211 is integrally provided in a cylindrical shape, the rotor housing 211 is hollow inside to penetrate through two end faces thereof, and the rotor magnetic steel 22 is circumferentially arranged on the inner wall of the rotor housing 211 at intervals.
The first end cover 212 and the second end cover 213 are mounted on the rotor housing 211 by screws, and the center points of the first end cover 212 and the second end cover 213 are both connected to the stator main shaft 101 by bearings 13, wherein the mounting port 4 is provided on the first end cover 212 or the second end cover 213. In one embodiment, the mounting port 4 is disposed on the first end cap 212, one end of the stator main shaft 101 penetrates the first end cap 212 to extend into the mounting port 4, the other end of the stator main shaft 101 penetrates the second end cap 213, and the second end cap 213 and the other end of the stator main shaft 101 are sealed by the oil seal ring 19. In another embodiment, the mounting port 4 is disposed on the second end cover 213, one end of the stator main shaft 101 penetrates the second end cover 213 to extend into the mounting port 4, the other end of the stator main shaft 101 penetrates the first end cover 212, and the first end cover 212 and the other end of the stator main shaft 101 are sealed by the oil seal ring 19. In this embodiment, the installation opening 4 is set on the first end cap 212 or the second end cap 213 according to actual conditions, and this embodiment is not particularly limited, but the installation opening 4 is marked and explained as an example on the first end cap 212 in this embodiment.
A first O-ring 6 is compressed between the first end cover 212 and the rotor housing 211, and a second O-ring 7 is compressed between the second end cover 213 and the rotor housing 211. The sealing performance between the first end cover 212 and the rotor housing 211 is improved by the arrangement of the first O-shaped sealing ring 6, the sealing performance between the second end cover 213 and the rotor housing 211 is improved by the arrangement of the second O-shaped sealing ring 7, and the phenomenon that external oil stains or dust enters the interior of the rotor housing 211 can be avoided.
And a third O-shaped sealing ring 8 is compressed between the mounting end cover 5 and the mounting port 4. The setting of third O type sealing washer 8 has further improved the leakproofness between installation end cover 5 and installing port 4, can avoid external oil stain or dust to enter into in installing port 4.
Wherein, the position department that the outer wall of installation end cover 5 is relative with response magnet steel 31 is provided with isolation iron sheet 9, and isolation iron sheet 9 fixes on the outer wall of installation end cover 5, and fixed mode can adopt the welded mode or the mode of joint. The spacer iron sheet 9 is a circular sheet, and the diameter of spacer iron sheet 9 is greater than the size of induction magnet steel 31 and magnetic induction encoder 32, and then spacer iron sheet 9 can keep apart external magnetic field, prevents that external magnetic field from disturbing magnetic induction encoder 32, influences the error that magnetic induction encoder 32 calculated the positional information who obtains outer rotor 21.
In order to further improve the external magnetic field interference, in the present embodiment, as shown in fig. 3, a non-magnetic-conductive mounting sleeve 10 is fixed on an inner wall surface of the mounting end cap 5, and the induction magnetic steel 31 is disposed on the mounting sleeve 10. The induction magnet 31 is made of permanent magnetic material, such as NdFeB, and may be in the shape of a cylinder or a rectangular parallelepiped, wherein the non-magnetic material of the mounting sleeve 10 includes, but is not limited to, aluminum, ceramic, plastic or resin material.
In this application, in order to improve the installation convenience of the magnetic induction encoder 32, the following installation method of the magnetic induction encoder 32 is adopted:
as shown in fig. 5 and 6, the end surface of the stator main shaft 101 is connected to the mounting bracket 11, and the mounting bracket 11 is connected to the end surface of the stator main shaft 101 in a threaded manner, that is, the mounting bracket 11 is screwed to the opening of the main shaft cavity 103. The mounting bracket 11 is provided with an adapter plate 12, the adapter plate 12 is a circular plate, the diameters of the adapter plate 12 and the mounting bracket 11 are both smaller than the diameter of the stator main shaft 101, but the diameters of the adapter plate 12 and the mounting bracket 11 are larger than the aperture of the main shaft cavity 103. So that the adapter plate 12 and the mounting bracket 11 can pass through the inner diameter of the bearing 13 when the bearing 13 is sleeved on the end of the stator main shaft 101.
The adapter plate 12 is provided with a signal input pin and a signal output pin, and the signal input pin of the adapter plate 12 is used for connecting with a signal line. In the application, when the stator unit 1 is assembled in the rotor unit 2, the mounting bracket 11 is screwed at the end of the stator main shaft 101 in advance, the signal wire penetrates out of the through hole in the mounting bracket 11, and then the signal wire is welded on the signal input pin of the adapter plate 12 in a soldering mode, so that the adapter plate 12 is attached to the surface of the mounting bracket 11, and the signal wire is fixed by applying glue to the end of the stator main shaft 101.
After the adapter plate 12 is mounted on the mounting bracket 11 and the signal lines are connected, the end of the stator main shaft 101 is sleeved with the upper bearing 13 to be assembled into the rotor unit 2.
It should be noted that after the first end cap 212 and the second end cap 213 are mounted on the two ends of the stator main shaft 101 through the bearings 13, the adapter plate 12 at one end of the stator main shaft 101 is located in the mounting opening 4, so that the circuit board 14 can be mounted on the adapter plate 12 in the mounting opening 4. Specifically, the magnetic induction encoder 32 is provided on the circuit board 14, and the circuit board 14 is used to process the position information of the outer rotor 21 output by the magnetic induction encoder 32. The circuit board 14 is a circular plate, the magnetic induction encoder 32 is arranged in the center of the circuit board 14, the circuit board 14 is provided with a welding pin 15 and a welding notch 16, the circuit board 14 is arranged in the mounting opening 4, and the welding pin 15 and the signal output pin are welded through the welding notch 16, so that signal intercommunication and data interaction among the magnetic induction encoder 32, the circuit board 14, the adapter plate 12 and the signal line are realized.
In this embodiment, the magnetic induction encoder 32 outputs the position information of the rotor to the circuit board 14 in a digital manner, an analog manner, or an orthogonal encoded waveform, and the circuit board 14 processes the position information and transmits the processed position information to the motor driver through the adapter plate 12 and the signal line.
After the soldering pins 15 of the circuit board 14 and the signal output pins of the adapter plate 12 are soldered, the circuit board 14 is connected to the mounting bracket 11 by screws, and the center of the circuit board 14 is located on the rotation center axis of the external rotor motor, wherein the adapter plate 12 is clamped between the circuit board 14 and the mounting bracket 11 and is fixed.
To ensure concentricity between the circuit board 14, the interposer 12 and the mounting bracket 11. In this embodiment, at least two positioning posts 17 are provided on the mounting bracket 11, and the number of the positioning posts 17 is two.
The midpoint of a connecting line between the diagonally arranged positioning columns 17 is located on the axial direction line of the stator main shaft 101, that is, on the rotation central axis of the outer rotor 21. When the circuit board 14 and the adapter plate 12 are mounted on the mounting bracket 11, the positioning post 17 of the mounting bracket 11 firstly passes through the positioning holes 18 of the adapter plate 12 and the circuit board 14 to pre-position the adapter plate 12 and the circuit board 14, so as to keep the centers of the adapter plate 12 and the circuit board 14 on the rotation central axis of the outer rotor motor. And then the circuit board 14 is clamped on the adapter plate 12 and fixed on the mounting bracket 11 by passing screws through the circuit board 14 and the adapter plate 12 respectively.
Thus, the present application has the following effects by the above-described mounting method of the magnetic induction encoder 32:
1. by means of the post-installation of the circuit board 14, the circuit board 14 can be prevented from being damaged during the assembly of the stator unit 1 on the rotor unit 2, and the concentricity between the magnetic induction encoder 32 and the rotation center shaft of the external rotor motor can be ensured by the above-mentioned means.
2. When magnetic induction encoder 32 damages and needs to be maintained, only need open through installing end cover 5, can follow and contact magnetic induction encoder 32 in installing port 4, and then can maintain or change magnetic induction encoder 32, wherein, the process of maintenance change only need with circuit board 14 whole from adapter plate 12 on the installation of welding can, and need not to drag the signal line, avoid dragging the signal line and lead to the fact the damage to the signal line, also ensured in narrow and small physical space, also have better installation convenience.
In order to ensure the normal use of the external rotor motor, a damping unit including, but not limited to, a solid tire or a pneumatic tire is fixedly disposed on the outer surface of the rotor housing 211.
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention, which is defined by the appended claims.
Claims (8)
1. The rotor unit comprises an outer rotor (21) and rotor magnetic steel (22), wherein the rotor magnetic steel (22) is circumferentially arranged in the outer rotor (21) at intervals, and is characterized in that the outer rotor (21) is provided with a mounting opening (4) at the position of a motor rotating central shaft of the outer rotor (21), and a mounting end cover (5) is detachably sealed on the mounting opening (4).
2. The rotor unit of an external rotor motor split seal design according to claim 1, wherein the external rotor (21) comprises a rotor housing (211), a first end cover (212) and a second end cover (213);
rotor magnet steel (22) circumference interval arrangement is on rotor case's (211) inner wall, first end cover (212) and second end cover (213) pass through the mounting screw on rotor case (211), installing port (4) set up on first end cover (212) or second end cover (213).
3. The rotor unit of external rotor motor split seal design according to claim 2, wherein a first O-ring seal (6) is compressed between the first end cover (212) and the rotor housing (211).
4. The rotor unit of external rotor motor split seal design according to claim 2, wherein a second O-ring seal (7) is compressed between the second end cover (213) and the rotor housing (211).
5. The rotor unit of an external rotor motor split seal design according to claim 1, wherein the mounting end cover (5) is mounted on the mounting port (4) by screws.
6. The rotor unit of the external rotor motor split sealing design according to claim 5, wherein a third O-shaped sealing ring (8) is compressed between the mounting end cover (5) and the mounting port (4).
7. The rotor unit of the outer rotor motor with the split type sealing design according to claim 1, wherein a non-magnetic-conductive mounting sleeve (10) is fixed on the inner wall surface of the mounting end cover (5), the mounting sleeve (10) is positioned on a motor rotation central shaft of the outer rotor (21), and an induction magnetic steel (31) is arranged in the mounting sleeve (10).
8. The rotor unit of the external rotor motor split sealing design according to claim 7, wherein a position of the outer wall surface of the mounting end cover (5) opposite to the induction magnetic steel (31) is provided with an isolation iron sheet (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921570211.3U CN210431046U (en) | 2019-09-19 | 2019-09-19 | Rotor unit of outer rotor motor split type sealing design |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921570211.3U CN210431046U (en) | 2019-09-19 | 2019-09-19 | Rotor unit of outer rotor motor split type sealing design |
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| CN210431046U true CN210431046U (en) | 2020-04-28 |
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| CN201921570211.3U Active CN210431046U (en) | 2019-09-19 | 2019-09-19 | Rotor unit of outer rotor motor split type sealing design |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112910203A (en) * | 2021-04-02 | 2021-06-04 | 威海锦阳电子有限公司 | Manufacturing method of outer rotor of motor |
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2019
- 2019-09-19 CN CN201921570211.3U patent/CN210431046U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112910203A (en) * | 2021-04-02 | 2021-06-04 | 威海锦阳电子有限公司 | Manufacturing method of outer rotor of motor |
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