CN218569955U

CN218569955U - Brushless motor with outer rotor

Info

Publication number: CN218569955U
Application number: CN202222371411.4U
Authority: CN
Inventors: 何昌英; 廖中印
Original assignee: Sichuan Hongheng Motor Co ltd
Current assignee: Sichuan Hongheng Motor Co ltd
Priority date: 2022-09-07
Filing date: 2022-09-07
Publication date: 2023-03-03
Anticipated expiration: 2032-09-07

Abstract

The utility model discloses an outer rotor brushless motor belongs to motor technical field, including outer rotor and end cover, be equipped with the inner stator in outer rotor, and the inner wall equidistance of outer rotor is equipped with the groove of a plurality of tops and outer rotor port intercommunication, at the inslot and be equipped with the permanent magnet, the permanent magnet partly inlays on the groove of outer rotor inner wall, and the upper surface laminating of permanent magnet has the clamp plate simultaneously, and the clamp plate extrudees the permanent magnet in the inner wall inslot of outer rotor, adopts sticky and the problem that drops easily for preventing the permanent magnet at outer rotor inner wall, this application sets up the shallow slot on outer rotor inner wall and pegs graft the permanent magnet in the shallow slot to can effectually prevent the problem that the permanent magnet drops, thereby the shallow slot of seting up on the outer rotor inner wall and the port intercommunication of outer rotor are convenient for the insertion of permanent magnet, simultaneously can be further install among the shallow slot for guaranteeing the permanent magnet, be provided with the clamp plate on the permanent magnet and carry out decurrent extrusion to with magnet, thereby use these can be firmly to inlay among the shallow slot.

Description

Brushless motor with outer rotor

Technical Field

The utility model belongs to the technical field of the motor, specifically speaking relates to an external rotor brushless motor.

Background

Compared with the structure of an inner rotor motor, the outer rotor motor has certain advantages in the aspects of noise, rotational inertia, enameled wire cost and the like, and in addition, the outer rotor motor also has the advantages of high power density, compact structure, long service life, safety, reliability and the like, so that the outer rotor motor is applied by more and more manufacturers.

However, in the external rotor motor in the prior art, the plurality of permanent magnets are arranged on the inner wall of the external rotor, and the inner stator is assembled in the cavity formed by the permanent magnets, but the permanent magnets of the external rotor in the prior art are attached to the inner wall of the casing through glue, so that the assembly efficiency is low, the reliability is low, and the external rotor motor is easy to fall off when being collided.

SUMMERY OF THE UTILITY MODEL

Adopt sticky mode to fix the back to the permanent magnet in the current external rotor brushless motor, the problem that drops easily, the utility model provides an external rotor brushless motor through at outer rotor inner wall fluting gomphosis permanent magnet, recycles the clamp plate and contradicts the permanent magnet top to fixed permanent magnet.

In order to solve the problem, the utility model adopts the following technical proposal.

An outer rotor brushless motor comprises an outer rotor and an end cover, wherein an inner stator is assembled in the outer rotor, a plurality of grooves with tops communicated with ports of the outer rotor are formed in the inner wall of the outer rotor at equal intervals, permanent magnets are arranged in the grooves, the permanent magnets are half embedded in the grooves in the inner wall of the outer rotor, meanwhile, a pressing plate is attached to the upper surface of each permanent magnet, and the pressing plate presses the permanent magnets into the grooves in the inner wall of the outer rotor.

Preferably, the port of the outer rotor is provided with an accommodating hole on the inner side, the accommodating hole is internally provided with a spring, and the pressing plate is movably inserted in the accommodating hole and connected with the upper surface of the spring.

Preferably, a turntable is embedded in the upper surface of the pressure plate at one section of the accommodating hole, a screw is arranged on the upper surface of the port of the outer rotor, and the tail end of the screw abuts against the upper surface of the turntable.

Preferably, an opening is formed in the port of the outer rotor, a screw is installed at the opening of the port, the end cover is assembled on the upper surface of the opening and connected with the outer rotor, a convex edge is integrally arranged on the outer side of the opening of the port of the outer rotor, and a bolt is arranged outside the convex edge to connect the outer rotor with the end cover.

Preferably, the centers of the end cover and the outer rotor are both provided with shaft holes, a main shaft is assembled in the outer rotor and penetrates through the inner stator, one end of the main shaft is inserted into the shaft hole of the outer rotor, the other end of the main shaft is inserted into the shaft hole of the end cover, and a ferrule is sleeved on the inner side, located on the end cover, of the main shaft.

Preferably, the end cover is provided with a plurality of second heat dissipation holes around the shaft hole, and the tail end of the outer rotor is provided with a plurality of first heat dissipation holes around the shaft hole.

Advantageous effects

Compared with the prior art, the beneficial effects of the utility model are that:

(1) The utility model discloses in, in order to prevent that the permanent magnet from adopting sticky and the easy problem that drops in outer rotor inner wall, this application sets up the shallow slot on outer rotor inner wall and pegs graft the permanent magnet in the shallow slot, thereby can effectually prevent the problem that drops with the magnet, further can be fast and convenient insert with among the shallow slot of outer rotor inner wall in order to guarantee the permanent magnet, thereby the shallow slot of this application with seting up on the outer rotor inner wall and the port intercommunication of external rotor are convenient for the insertion of permanent magnet, simultaneously can be further in order to guarantee the permanent magnet install among the shallow slot, be provided with the clamp plate and carry out decurrent extrusion to the permanent magnet at the upper surface of permanent magnet, thereby use these can be firm inlay among the shallow slot.

(2) The utility model discloses in, to the clamp plate, this application is provided with other structure and can fixes the clamp plate to make the clamp plate can be with fixing among the shallow slot that permanent magnet safety is firm, its concrete structure is: be provided with a carousel that can rotate at the upper surface of clamp plate, the upper surface of rotor is provided with a screw outside simultaneously, can contact the carousel when the screw runs through the outer rotor to inside motion, the screw continuation motion can drive the carousel and rotate, decurrent power makes the clamp plate tightly press on the permanent magnet simultaneously, the purpose that should set up is, further make the clamp plate fastening, prevent the permanent magnet and break away from, adopt the simplest structure to fix the clamp plate simultaneously, the screw is the most convenient and the minimum fixed part of cost of using at present, but the screw has certain revolving force when screw motion, consequently, the revolving force through carousel uninstallation screw, make the screw only provide decurrent pressure for the clamp plate.

(3) The utility model discloses in, during the permanent magnet when follow-up maintenance or change, as long as take out the screw, the clamp plate upwards plays under the effect of spring to make the permanent magnet not hard up in the shallow slot, just can take out the permanent magnet from the shallow slot, the end cover that this application set up simultaneously can shelter from screw and clamp plate isotructure, makes its airtight play the isolated effect of protection among whole brushless motor, the end cover is connected with the external rotor through a bolt equally, consider portable and cost equally.

Drawings

Fig. 1 is a schematic structural diagram of an external rotor brushless motor according to the present invention;

fig. 2 is a schematic diagram of an explosion structure of the brushless motor of the present invention;

fig. 3 is a schematic structural view of the fixing mechanism of the middle permanent magnet of the present invention.

The correspondence between the labels of the various figures in the drawing and the names of the components is as follows: 1. a main shaft; 2. an inner stator; 3. an outer rotor; 4. a convex edge; 5. a first heat dissipation hole; 6. a second heat dissipation hole; 7. an end cap; 8. a ferrule; 9. a permanent magnet; 10. pressing a plate; 11. a bolt; 12. a screw; 13. a turntable; 14. a receiving hole; 15. a spring.

Detailed Description

The present invention will be further described with reference to the following detailed description.

An external rotor brushless motor provided in fig. 1, 2 and 3 includes an external rotor 3 and an end cover 7, which constitute the brushless motor, an internal stator 2 is assembled in the external rotor 3, and the inner wall of the external rotor 3 is equidistantly provided with a plurality of grooves, the tops of which are communicated with the ports of the external rotor 3, a permanent magnet 9 is arranged in each groove, the internal stator 2 and the external rotor 3 are all necessary parts on the direct current brushless motor, the stator is fixed on a machine shell, and a coil is generally wound on the stator and is a stationary part; the rotor is arranged on a machine base through a bearing, a silicon steel sheet is arranged on the rotor and is a rotating part, when the rotor and the rotor work, due to the action of current, the stator can generate a magnetic field, the magnetic field drives the rotor to rotate, electric energy is converted into mechanical energy, the rotor is mainly arranged on the rotor and is an important part of a brushless motor, most of performance parameters of the rotor are related to magnets, such as power, rotating speed, torque and the like, the permanent magnet 9 is half embedded in a groove on the inner wall of the outer rotor 3, meanwhile, a pressing plate 10 is attached to the upper surface of the permanent magnet 9, the pressing plate 10 presses the permanent magnet 9 in an inner wall groove of the outer rotor 3, in order to prevent the permanent magnet 9 from easily falling off due to adhesion, the shallow groove is formed in the inner wall of the outer rotor 3, the permanent magnet 9 is inserted in the shallow groove, the problem that the permanent magnet 9 falls off can be effectively prevented, further, in order to ensure that the permanent magnet 9 can be quickly and conveniently inserted in the shallow groove in the inner wall of the outer rotor 3, the application, the permanent magnet 9 is communicated with a port of the outer rotor 3, so that the permanent magnet 9 can be firmly inserted, and meanwhile, in order to ensure that the permanent magnet 9 can be further installed in the shallow groove, the permanent magnet 9 is arranged in the shallow groove, the upper surface of the pressing plate is firmly pressed.

In fig. 3, an accommodating hole 14 is formed in an inner side of a port of an outer rotor 3, a spring 15 is arranged in the accommodating hole 14, and a pressing plate 10 is movably inserted into the accommodating hole 14 and connected with an upper surface of the spring 15, when the top of the pressing plate 10 is not controlled by an external force, the pressing plate 10 is pushed up upwards by a repulsive force of the spring 15, so that the pressing plate 10 does not extrude the permanent magnet 9 any more, and the permanent magnet 9 is loosened in a shallow groove, so that the permanent magnet 9 can be taken out of the shallow groove, wherein the spring 15 is arranged in the accommodating hole 14, a rotating disc 13 is embedded in a section of the upper surface of the accommodating hole 14 of the pressing plate 10, a screw 12 is arranged on the upper surface of the port of the outer rotor 3, the tail end of the screw 12 abuts against the upper surface of the rotating disc 13, a rotating disc 13 capable of rotating is arranged on the upper surface of the pressing plate 10, a screw 12 is arranged on the upper surface of the outer rotor 3, when the screw 12 moves inwards, the screw 12 contacts the rotating disc 13, the screw 12 can drive the rotating disc 13 to rotate, and the pressing plate 10 is tightly pressed against the permanent magnet 9, the pressing plate 10 is further fastened, the pressing plate 10 is prevented from being detached from the pressing plate 10 by a screw structure, and the rotating force, and the pressing plate 12 is convenient and the pressing plate can be easily removed, and the pressing plate 10.

In fig. 3, an opening convenient for connecting an end cover 7 is formed in a port of an outer rotor 3, a screw 12 is installed at the opening of the port, the end cover 7 is assembled on the upper surface of the opening to be connected with the outer rotor 3, a convex edge 4 with a lengthened connecting contact point is integrally arranged on the outer side of the opening of the port of the outer rotor 3, a bolt 11 is arranged outside the convex edge 4 to connect the outer rotor 3 with the end cover 7, shaft holes are formed in the centers of the end cover 7 and the outer rotor 3, a spindle 1 is assembled in the outer rotor 3, the spindle 1 is a direct stressed part of a motor rotor, the hardness of the spindle must meet the requirement of high-speed rotation of the rotor, the spindle 1 penetrates through an inner stator 2, one end of the spindle 1 is inserted in the shaft hole of the outer rotor 3, the other end of the spindle 1 is inserted in the heat dissipation hole of the end cover 7, a ferrule 8 is sleeved on the spindle 1 on the inner side of the end cover 7, the end cover 7 can shield the screw 12, a pressing plate 10 and other structures, the end cover 7 can seal the spindle hole to play a role of protecting and isolating, the whole brushless motor, the end cover 7 is also connected with the outer rotor 3 through the bolt 11, the portable rotor 3, the portable rotor and the cost are also considered, a plurality of the end cover 7 is formed around a plurality of the second rotor 6, and the second rotor 5 are formed on the end of the outer rotor.

The above description is for further details of the present invention, and it is not assumed that the embodiments of the present invention are limited to these descriptions, and it is obvious to those skilled in the art that the present invention can be implemented by a plurality of simple deductions or replacements without departing from the concept of the present invention, and all should be considered as belonging to the protection scope defined by the claims submitted by the present invention.

Claims

1. The utility model provides an outer rotor brushless motor, includes outer rotor (3) and end cover (7), is equipped with inner stator (2) in outer rotor (3), and the inner wall equidistance of outer rotor (3) is equipped with the groove of a plurality of tops and outer rotor (3) port intercommunication, is equipped with permanent magnet (9), its characterized in that in the groove:

the permanent magnet (9) is half embedded in a groove in the inner wall of the outer rotor (3), meanwhile, a pressing plate (10) is attached to the upper surface of the permanent magnet (9), and the pressing plate (10) extrudes the permanent magnet (9) in the groove in the inner wall of the outer rotor (3).

2. An external rotor brushless motor according to claim 1, wherein: an accommodating hole (14) is formed in the inner side of the port of the outer rotor (3), a spring (15) is assembled in the accommodating hole (14), and meanwhile the pressing plate (10) is movably inserted in the accommodating hole (14) and connected with the upper surface of the spring (15).

3. An external rotor brushless motor according to claim 2, wherein: the upper surface of the pressing plate (10) at one section of the accommodating hole (14) is embedded with a rotary table (13), a screw (12) is arranged on the upper surface of the port of the outer rotor (3), and the tail end of the screw (12) is abutted against the upper surface of the rotary table (13).

4. An external rotor brushless motor according to claim 3, wherein: the port department of outer rotor (3) has seted up the opening, and screw (12) install in the opening department of port, end cover (7) assembly is connected with outer rotor (3) at the upper surface of opening, is equipped with chimb (4) in the opening department outside of outer rotor (3) port an organic whole simultaneously, and chimb (4) are equipped with bolt (11) outward and are connected outer rotor (3) and end cover (7).

5. An external rotor brushless motor according to claim 1, wherein: the motor rotor is characterized in that shaft holes are formed in the centers of the end cover (7) and the outer rotor (3), a main shaft (1) is assembled in the outer rotor (3), the main shaft (1) penetrates through the inner stator (2), one end of the main shaft (1) is inserted into the shaft hole of the outer rotor (3), the other end of the main shaft (1) is inserted into the shaft hole of the end cover (7), and a ferrule (8) is sleeved on the inner side, located on the main shaft (1), of the end cover (7).

6. The external rotor brushless motor of claim 1, wherein: a plurality of second heat dissipation holes (6) are formed in the end cover (7) around the shaft hole, and a plurality of first heat dissipation holes (5) are formed in the tail end of the outer rotor (3) around the shaft hole.