CN214959229U

CN214959229U - External rotor motor

Info

Publication number: CN214959229U
Application number: CN202120890683.8U
Authority: CN
Inventors: 罗宁; 陈丹枫; 王安
Original assignee: Ningbo Saijia Electromechanical Co ltd
Current assignee: Ningbo Saijia Electromechanical Co ltd
Priority date: 2021-04-28
Filing date: 2021-04-28
Publication date: 2021-11-30
Anticipated expiration: 2031-04-28

Abstract

The utility model provides an external rotor electric machine, including an external rotor subassembly and a stator, the stator be installed in the external rotor subassembly, the external rotor subassembly includes a rotor and a drive shaft, the drive shaft is fixed in the rotor, the stator be installed in the drive shaft, the rotor with the drive shaft is relative the stator rotates.

Description

External rotor motor

Technical Field

The utility model relates to the field of electric machines, especially, relate to an external rotor electric machine.

Background

The motor has wide application in the field of electric appliances. With the improvement of the social living standard, small electric appliances such as electric toothbrushes and electric beauty instruments are favored by more and more consumers. The working parts of such small electric appliances need to be driven by a motor to reciprocate for cleaning, massaging, etc. The angle, distance, frequency, stability, etc. of the reciprocating motion of the working member have an influence on the working effect. The performance of the motor is decisive for the working effect of the working parts.

Referring to fig. 1, there is shown a schematic view of a conventional motor including a stator 10P, a rotor 20P, and a driving shaft 30P, wherein the driving shaft 30P is installed to the rotor 20P through the rotor 20P, and the rotor 20P and the driving shaft 30P are installed to the stator 10P through the stator 10P. The stator 10P has two symmetrical winding teeth 11P on the inner side, and the winding teeth 11P are used for winding coils. Magnet steel 40P is installed at the both ends of rotor 20P, respectively towards wire winding tooth 11P, wire winding tooth 11P with produce the effort between magnet steel 40P, the drive rotor 20P motion, and then make drive shaft 20P vibrates.

After the coil is electrified, the winding teeth 11P on the two sides respectively generate an N pole and an S pole, and the magnetic steel 40P on the single side respectively generates an N pole and an S pole, so that the rotor 20P moves along one direction, the current direction is changed, the rotor 20P moves in the reverse direction, and the driving shaft 30P vibrates.

The rotor 20P is disposed inside the stator 10P, and under the condition that the motor has a certain volume, the winding teeth 11P of the stator 10P are limited by the rotor 20P disposed in the middle, and cannot have a larger volume, so that the coils that can be wound by the winding teeth 11P are limited, and finally the output of the motor is limited. The rotor 20P is arranged on the inner side, so that the overall size is small, the positioning through an assembling tool is not facilitated, and the automatic assembling of the motor is limited.

SUMMERY OF THE UTILITY MODEL

An advantage of the utility model is that an external rotor electric machine is provided, external rotor electric machine sets up the rotor in the stator outside, increases the volume of stator wire winding portion, and it is big to exert oneself, and it is effectual to vibrate.

The utility model discloses an another advantage lies in providing an external rotor electric machine, external rotor electric machine includes an external rotor subassembly, external rotor subassembly integration rotor and drive shaft form half finished product, make things convenient for the location installation of follow-up stator and other parts, are favorable to realizing automatic assembly, improve assembly efficiency.

Another advantage of the present invention is to provide an external rotor electric machine, which has a small and uniform air gap between the external rotor assembly and the internal stator core, thereby improving energy conversion efficiency and reducing energy loss.

The utility model discloses a further advantage lies in providing an external rotor electric machine, constitutes external rotor electric machine's accessories is small in quantity, and the assembly degree of difficulty is little, and is efficient.

The other advantages and features of the invention will be fully apparent from the following detailed description and realized by means of the instruments and combinations particularly pointed out in the appended claims.

According to the utility model discloses an aspect, the utility model discloses an external rotor electric machine is further provided, include:

the stator is arranged in the outer rotor assembly, the outer rotor assembly comprises a rotor and a driving shaft, the driving shaft is fixed to the rotor, the stator is arranged on the driving shaft, and the rotor and the driving shaft rotate relative to the stator.

According to the utility model discloses an embodiment, the rotor includes a fixed part and an at least magnetic force portion, magnetic force portion distribute in at least the both sides of drive shaft, the fixed part is connected magnetic force portion, wherein the drive shaft passes the fixed part, distribute in between the magnetic force portion, and be fixed in the fixed part, wherein the stator is located between the magnetic force portion.

According to the utility model discloses an embodiment, the outer rotor subassembly still includes two at least magnet steels, the magnet steel be installed in magnetic force portion, distribute in the both sides of stator.

According to the utility model discloses an embodiment, magnetic force portion is installed the surface that forms behind the magnet steel is the cambered surface.

According to the utility model discloses an embodiment, the stator includes an installation department, two wire winding portions and two outer tip, wire winding portion outer tip distribute in proper order in the both sides of installation department, the inside confession of having defined of installation department the passageway that the drive shaft passed.

According to an embodiment of the present invention, the outer end portion is in the shape of a protruding limit tooth on both sides of the winding portion in the axial direction, wherein the winding portion is provided for winding a coil.

According to an embodiment of the present invention, the outer end portion has a second outer surface, the second outer surface is a curved surface, and air gaps of uniform size are distributed between the magnetic force portions.

According to the utility model discloses an embodiment, distribute in the drive shaft both sides magnetic force portion is installed single magnet steel respectively, produces N utmost point and S utmost point respectively in axial both sides, the magnet steel distribute in the outside of outer tip, first surface with have the even air gap of size between the second surface.

According to the utility model discloses an embodiment, unilateral magnetic force portion is equipped with two magnet steels of mutual spaced, and two magnet steels produce the N utmost point and the S utmost point respectively, the magnet steel has respectively and is curved first surface, orientation the second surface, unilateral the holistic surface of magnetic force portion with form evenly distributed' S air gap between the second surface.

According to the utility model discloses an embodiment, the external rotor electric machine still includes a shell and an end cover, the shell by the cover in the outside of rotor, with the drive shaft keeps away the blank and connects, the end cover install in the one end of shell, with the shell parcel the rotor with the stator.

Drawings

Fig. 1 is a schematic diagram of a prior art electric machine.

Fig. 2 is a schematic view of an external rotor motor according to a preferred embodiment of the present invention.

Fig. 3 is an exploded view of an outer rotor motor according to a preferred embodiment of the present invention.

Fig. 4 is a partially disassembled schematic view of an external rotor motor according to a preferred embodiment of the present invention.

Fig. 5 is a partial top view schematically illustrating an external rotor motor according to a preferred embodiment of the present invention.

Fig. 6 is a schematic view showing the movement of an external rotor motor according to a preferred embodiment of the present invention.

Detailed Description

The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The embodiments of the invention described below and shown in the drawings are to be regarded as examples only and do not limit the invention. Any variations or modifications may be made to the embodiments of the invention without departing from the principles described.

Referring to fig. 2 to 6 of the drawings attached to the present application, an external rotor motor according to a preferred embodiment of the present invention is disclosed and explained in the following description.

The outer rotor motor is externally provided with a rotor, the rotor and a driving shaft are fixed, and the stator is arranged inside the rotor, drives the rotor to move and drives the driving shaft to move. Compared with the traditional motor with an inner rotor outer stator, the motor with the inner rotor outer stator has the advantages that the size of the inner stator can be larger, the winding part is larger, more coils can be wound, and the force output effect of the motor is enhanced. Under the certain condition of holistic volume of motor, the utility model discloses a rotor distributes in the outside of stator, and the space that the rotor occupied can be littleer, and distributes in the periphery of stator, and supply the installation magnet steel can, and then the wire winding portion of stator can prolong, possess bigger wire winding space, increase the wire winding number of coil.

In addition, the rotor of the outer rotor motor and the driving shaft form a whole, so that the assembly process is saved, the assembly difficulty is reduced, and the automatic assembly is facilitated.

Specifically, the external rotor motor comprises an external rotor assembly 10 and a stator 20, wherein the stator 20 is installed inside the external rotor assembly 10, and the external rotor assembly 10 moves relative to the stator 20. The external rotor assembly 10 includes a driving shaft 11 and a rotor 12, the driving shaft 11 is fixed to the rotor 12, and the rotor 12 moves to drive the driving shaft 11 to move, thereby driving other components.

It will be understood by those skilled in the art that the axial direction is defined as the extending direction of the driving shaft, and the above direction definition is made only for the purpose of convenience of description, and is not a limitation to the technical solution of the present invention.

Preferably, the central axes of the drive shaft 11 and the rotor 12 coincide so that the drive shaft 11 is centered with respect to the rotor 12. It is to be understood that the centering may be centering in one direction, or may be centering in a plurality of directions. In other examples of the invention, the drive shaft 11 may not be in a central position, but may be distributed in the space inside the rotor 12.

A portion of the driving shaft 11 is located outside the rotor 12, another portion of the driving shaft 11 is located inside the rotor 12, and the stator 20 is mounted in a clearance manner on the portion of the driving shaft 11 located inside the rotor 12. The stators 20 are distributed outside the drive shaft 11 in the axial direction. The portion of the drive shaft 11 outside the rotor 12 transmits power to other components. The other components are components which need to be driven for installing the external rotor motor.

The rotor 12 includes at least one fixing portion 121 and at least one magnetic portion 122, and the magnetic portion 122 is formed by extending from the fixing portion 121 in the same direction. The magnetic force portions 122 are distributed along the axial extension of the rotor 12. The magnetic parts 122 are at least distributed on two sides of the motor shaft 11, and the magnetic parts 122 may be distributed on two sides of the motor shaft 11 in a split manner or distributed on two sides of the motor shaft 11 as a whole. The fixing portion 121 is distributed at an end of the magnetic portion 122 to connect the split magnetic portion 122. The driving shaft 11 passes through the fixing portion 121 and is fixed to the fixing portion 121. That is, the magnetic force parts 122 are distributed on both sides of the stator 20.

Preferably, the magnetic parts 122 are symmetrically distributed on both sides of the motor shaft 11, the magnetic parts 122 on both sides are separated from each other and are connected by the fixing part 121 only at one end, so that the magnetic parts 122, the fixing part 121 and the driving shaft 11 form a whole as an assembly semi-finished product. The split distribution of the magnetic force part 122 can reduce the overall volume of the magnetic force part 122, and reduce the cost.

Preferably, the driving shaft 11 passes through the center of the fixing portion 121, and the magnetic portions 122 are symmetrically distributed on both sides of the driving shaft 11.

In an example of the present invention, the fixing portion 121 and the driving shaft 11 may be fixed by gluing, so that the rotor 12 and the driving shaft 11 form a whole fixed to each other. Other fixing modes such as buckle connection, limiting connection and the like or integrated molding through a mold can be adopted.

The outer rotor assembly 10 further includes at least one magnetic steel 13, and the magnetic steel 13 is mounted on the rotor 12. The magnetic part 122 is provided with at least one mounting groove 1220, and the magnetic steel 13 is inserted into the mounting groove 1220. In the example of the present invention, the magnetic steel 13 is distributed on both sides of the stator 20, and the stator 20 generates a mutual acting force, so that the stator 20 drives the rotor 12 to move.

Further, the magnetic parts 122 disposed on both sides of the motor shaft are respectively provided with the mounting grooves 122, the mounting grooves 122 are axially disposed along the magnetic parts 122, and the mounting grooves 1220 on both sides are respectively inserted into the magnetic steel 13 to respectively generate acting forces with both ends of the stator 20 disposed in the axial direction.

In an example of the present invention, the magnetic steel 13 is symmetrically distributed on both sides of the stator 20. Further, the magnetic force portions 122 at two sides of the stator 20 are symmetrically distributed, and are symmetrically provided with the mounting grooves 1220 for being respectively inserted into the magnetic steels 13. The symmetrical structure facilitates centering of the stator 20 and the driving shaft 11 and force balance of both sides, and is less difficult to design and manufacture.

In another example of the present invention, two or more mounting grooves 1220 that do not interfere with each other are formed in the magnetic portion 122 on the same side, so as to be inserted into the magnetic steel 13 respectively. Two or more groups of magnetic steels 13 are symmetrically distributed on two sides of the driving shaft 11.

Magnet steel 13 is installed by the card position mounting in mounting groove 1220, mounting groove 1220 is right magnet steel 13 plays limiting displacement, prevents magnet steel 13 from the mounting groove 1220 drops.

The stator 20 includes a mounting portion 21, and a passage is defined in the mounting portion 21 for the driving shaft 11 to pass through. The stator 20 is fitted around the driving shaft 11 to be installed between the magnetic force parts 122. The stator 20 further includes two winding portions 22, the winding portions 22 extend from the mounting portion 21 to opposite sides, and the winding portions 22 are axially distributed along the two sides of the mounting portion 21. The winding portion 22 is provided for winding a coil.

The stator 20 further includes an outer end portion 23, and the outer end portion 23 extends from the end portion of the winding portion 22 to two sides and is axially distributed along the end portion of the winding portion 22 as a whole. The outer end portion 23 protrudes to both sides relative to the winding portion 22 to form a boss, so that a coil wound by the winding portion 22 is limited and prevented from falling off. In other words, the outer end portion 23 has teeth projecting to both axial sides with respect to the winding portion 22.

The stator 20 can be a symmetrical structure and integrally formed, so that the design and manufacturing difficulty is reduced.

The magnetic parts 122 define an installation space of the stator 20, compared with a traditional motor structure of an inner rotor outer stator, the stator 20 arranged in the motor structure has a larger winding space, and the winding parts 22 are extended, so that more coils are wound, and the output of the outer rotor motor is enhanced.

The magnetic steel 13 has a first outer surface 131, the outer end portion 23 has a second outer surface 231, the magnetic steel 13 is distributed outside the outer end portion 23, and the first outer surface 131 faces the second outer surface 231. The first outer surface 131 and the second outer surface 231 are both arc surfaces, so that air gaps between the adjacent first outer surface 131 and the second outer surface 231 are uniformly distributed.

The outer surface of the magnetic force part 122 mounted with the magnetic steel 13 is an arc surface, and the radian of the arc surface is the same as that of the second outer surface 231 of the stator 20, so that air gaps which are uniformly distributed are formed between the magnetic force part 122 and the stator 20.

In an example of the present invention, the magnetic force portion 122 installed with the same side is two the magnetic steel 13, both are isolated from each other, and are located two between the magnetic steel 13 the partial orientation of the magnetic force portion 122 the surface of the stator 20 is a cambered surface, the magnetic steel 13, the portion the magnetic force portion 122 and another the surface that the magnetic steel 13 formed with the air gap that the size is even distributes between the second outer surface 231. The air gaps between the arc-shaped surfaces are small and are uniformly distributed, so that the energy conversion efficiency is improved, and the output of the outer rotor motor is enhanced.

Similarly, the other magnetic part 122 is mounted with two magnetic steels 13, and the stator 20 and the other magnetic part 122 have air gaps with uniform size.

That is, uniformly distributed air gaps are respectively formed between both ends of the stator 20 and the magnetic force parts 122 distributed on both sides of the stator 20.

The air gaps formed between the two cambered surfaces with the same radian and the same direction are uniform in size, the integral volume is smaller, and the energy conversion efficiency is improved.

The outer rotor motor further includes a housing 30, the housing 30 is mounted on the outer side of the rotor 12, and the outer rotor motor further includes an end cover 40, the end cover 40 is mounted on one end of the housing 30 to surround the rotor 12 and the stator 20 together with the outer casing 30. One end of the drive shaft 11 passes through the end cap 40.

The end cap 40 includes a cap portion 41 and a positioning post 42, the positioning post 42 extends outwardly from the cap portion 41, one end of the driving shaft 11 extends into the positioning post 42, and the positioning post 42 assists in positioning the driving shaft 11 to prevent the driving shaft 11 from deflecting. The positioning column 42 is connected with the driving shaft 11 in a clearance way. The lid portion 41 is fixed to the housing 30. The positioning portion 42 is fixed to the stator 20. The stator 20, the end cap 40 and the housing 30 remain stationary relative to the outer rotor assembly 10.

The external rotor motor further includes at least two bearings 50, the bearings 50 are installed between the driving shaft 11 and the end cover 40, and the bearings 50 are installed between the driving shaft 11 and the housing 30 to support the movement of the driving shaft 11.

Referring to a movement diagram of the outer rotor motor shown in fig. 5, for convenience of description, a vertical and horizontal direction is defined from the viewpoint of an observation view. In one example, the outer end 23 of the stator 20 generates an N pole and an S pole on the left side and the right side, respectively, the magnetic steel 13 on the upper side of the magnetic part 122 generates an N pole, and the magnetic steel of the next time of the magnetic part 122 generates an S pole. For the left N pole of stator 20, upside the N pole of magnet steel 13 with the left side of stator 20 repels each other, next time the S pole of magnet steel with the left side of stator 20 attracts each other, makes rotor 12 up moves from bottom to top.

The outer end 23 on the right side of the stator 20 is an S pole, the magnetic steel 13 on the upper side and the right side of the stator 20 attract each other, and the magnetic steel 13 on the lower side and the right side of the stator 20 repel each other, so that the rotor 12 moves from bottom to top. The rotor 12 moves in a clockwise direction.

The direction of the current is changed such that the left and right sides of the stator 20 generate S and N poles, respectively, and the rotor 12 moves in a counterclockwise direction. The rotor 12 vibrates the driving shaft 11.

Acting force is generated between the two magnetic steels 13 on the same side and the two teeth of the outer end portion 23, the two teeth on one side of the outer end portion 23 respectively generate suction force and thrust force on the two magnetic steels 13, so that the rotor 12 moves, and the rotor 12 moves in the reverse direction by changing the current direction, so that the driving shaft 11 is driven to vibrate.

When the outer rotor motor is assembled, the driving shaft 11 and the rotor 12 are fixedly connected to form an assembly semi-finished product. During assembly, the semi-finished assembly product of the driving shaft 11 and the rotor 12 is positioned through a tool, and then other parts can be positioned and installed. The stator 20, the housing 30, the end cap 40, and the bearing 50 may be positioned along the drive shaft 11. Along the rotor 12, the magnetic steel 13 can be positioned and installed in the installation groove 1220, so that automatic assembly can be realized.

Firstly, providing a semi-finished product for fixing the driving shaft 11 and the rotor 12, winding the stator 20, assembling the stator 20 with the inner part of the rotor 12 along the driving shaft 11, arranging the stator 20 in a central way under the action of magnetic force, and installing the shell 30 on the outer part of the rotor 12 along the driving shaft 11. The end cap 40 is sleeved on the driving shaft 11 and fixed with the housing 30, and the driving shaft 11 passes through the end cap 40. The bearing 50 is installed between the driving shaft 11 and the housing 30, and between the driving shaft 11 and the end cap 40.

The installation of magnet steel 13 can pass through installation groove 1220 fixes a position and realizes, and the installation of other parts is with drive shaft 11 realizes as the medium, and the installation is simple, can realize automatic assembly.

Finally, the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same, the technical features in each technical solution can be modified or replaced, or combined with each other, and any technical solution that does not depart from the principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An external rotor electric machine, comprising:

2. The external rotor electric machine of claim 1, the rotor includes a fixing portion and at least one magnetic portion, the magnetic portion is at least distributed on two sides of the driving shaft, the fixing portion is connected to the magnetic portion, wherein the driving shaft passes through the fixing portion, is distributed between the magnetic portions, and is fixed to the fixing portion, wherein the stator is located between the magnetic portions.

3. The external rotor electric machine of claim 2, wherein the external rotor assembly further comprises at least two magnetic steels, the magnetic steels being mounted on the magnetic portion and distributed on both sides of the stator.

4. The external rotor motor according to claim 3, wherein the outer surface of the magnetic portion formed after the magnetic steel is mounted is an arc surface.

5. The external rotor electric machine as claimed in claim 4, wherein the stator includes a mounting portion, two winding portions and two outer end portions, the winding portions and the outer end portions being sequentially disposed at both sides of the mounting portion, the mounting portion defining a passage for the driving shaft to pass through therein.

6. The external rotor electric machine according to claim 5, wherein the outer end portion is formed in a shape of a limit tooth protruding perpendicularly to an axial direction with respect to the winding portion on which the coil is wound.

7. The external rotor electric machine of claim 6, wherein the outer end portion has a second outer surface, the second outer surface is a cambered surface, and air gaps of uniform size are distributed between the magnetic force portion.

8. The external rotor motor according to claim 7, wherein the magnetic force portions distributed on both sides of the driving shaft are respectively mounted with a single magnetic steel, and N-pole and S-pole are respectively generated on both sides in the axial direction, the magnetic steel is distributed outside the outer end portion, and an air gap having a uniform size is formed between the first outer surface and the second outer surface.

9. The external rotor electric machine of claim 7, wherein the magnetic force portion of one side is provided with two magnetic steels spaced apart from each other, the two magnetic steels generating N and S poles, respectively, the magnetic steels having first outer surfaces in the shape of arcs facing the second outer surface, and uniformly distributed air gaps being formed between the outer surfaces of the magnetic force portion of one side and the second outer surface.

10. The external rotor electric machine as claimed in any one of claims 1 to 9, wherein the external rotor electric machine further comprises a housing and an end cap, the housing is sleeved outside the rotor and connected with the driving shaft in a clearance manner, the end cap is mounted at one end of the housing, and the housing wraps the rotor and the stator.