CN220732463U

CN220732463U - Miniature external rotor brushless motor

Info

Publication number: CN220732463U
Application number: CN202321798481.6U
Authority: CN
Inventors: 隆春香; 刘跃龙
Original assignee: Nichibo Motor Shenzhen Co ltd
Current assignee: Nichibo Motor Shenzhen Co ltd
Priority date: 2023-07-10
Filing date: 2023-07-10
Publication date: 2024-04-05
Anticipated expiration: 2033-07-10

Abstract

The utility model discloses a miniature outer rotor brushless motor, and relates to the technical field of motors. The miniature outer rotor brushless motor comprises an iron shell, a controller, a lead wire assembly and a shaft, wherein the controller is arranged at an end opening of the iron shell, an end cover is arranged at the bottom of the iron shell in a pressing mode, a bracket which is in butt joint with the end cover is arranged between a through hole of the iron shell and a through hole of the controller in a pressing mode, the shaft is arranged between the iron shell, the controller, the bracket and the end cover, an encapsulating injection molding stator is movably connected to the outer wall of the bracket, which is positioned on the inner side of the iron shell, a magnet is arranged between the iron shell and the encapsulating injection molding stator, a magnet is arranged on the inner side of the iron shell in a pressing mode, and the magnet consists of ten groups of strip magnets with fusiform cross sections. The motor with the same traditional outer diameter has larger noise, the special-shaped sintered NdFeB magnet designed at present can reduce the space between the magnets, and the special-shaped magnet can reduce the cogging torque and has obvious motor noise reduction effect; the glue storage groove of the end cover can be used for storing glue, so that the holding force between the iron shell and the end cover is increased.

Description

Miniature external rotor brushless motor

Technical Field

The utility model relates to the technical field of motors, in particular to a miniature outer rotor brushless motor.

Background

The existing part of the miniature motor suitable for the fascia gun in the market has smaller and smaller motor volume requirements under the condition of the same torque force, and smaller noise is required for improving the experience of consumers, but the torque of the fascia gun motor with small volume in the market is smaller, the cogging torque of the motor is larger, and the noise is relatively larger;

the small-volume fascia gun market needs a motor with extremely low noise and large torsion; based on this requirement, a miniature external rotor brushless motor is provided to solve the above problems.

Disclosure of Invention

The utility model aims to provide a miniature outer rotor brushless motor, which can solve the problems of large noise and small torsion of the traditional small-volume fascia gun motor; in addition, the problems that the noise is reduced and the service life of the motor is prolonged by double pre-pressing of the front and the rear pezine are solved.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the miniature outer rotor brushless motor comprises a 1 iron shell, a 2 controller, a 4 lead wire assembly and an 8 shaft, wherein the 2 controller is arranged at an end opening of the 1 iron shell, a 5 end cover is pressed at the bottom of the 1 iron shell, a 3 support which is in butt joint with the 5 end cover is pressed between through holes of the 1 iron shell and the 2 controller, the 8 shaft is arranged between the 1 iron shell, the 2 controller, the 3 support and the 5 end cover, the 3 support is movably connected with a 6-package injection molding stator at the outer wall of the inner side of the 1 iron shell, a 9 magnet is arranged between the 1 iron shell and the 6-package injection molding stator, a 9 magnet is pressed at the inner side of the 1 iron shell, and the 9 magnet consists of ten groups of strip magnets with fusiform cross sections;

and a 7.1 bearing A and a 7.2 bearing B are pressed between the 3 bracket and the 8 shaft, the 7.1 bearing A and the 7.2 bearing B are respectively arranged in a front culture room and a rear culture room of the 3 bracket, a group of 11 waveform gaskets are respectively arranged between the 7.1 bearing A and the 7.2 bearing B and between the front culture room and the rear culture room of the 3 bracket, the 11 waveform gaskets are in a waveform annular structure, and 13 earless clamp springs are connected between the 7.2 bearing B and the 8 shaft.

Preferably, the 6-encapsulated injection-molded stator consists of a 6.1 chip and 6.2-encapsulated plastic, wherein the 6.1 chip is adhered to the outer wall of the 6.2-encapsulated plastic; 6.2, 10 windings are wound on the encapsulating plastic; and 12 support insulating papers with the same shape as the surface of the 2 controller far away from the 1 iron shell are attached on the surface of the 2 controller, and the 12 support insulating papers are made of DM composite insulating papers.

Preferably, the 3 bracket consists of a 3.1 die-sinking bracket and a 3.2 positioning groove, and the 3.2 positioning groove is integrally formed at the outer wall of the 3.1 die-sinking bracket along the axial direction of the 3.1 die-sinking bracket; the 3 bracket is assembled and connected with the 6-encapsulated injection molding stator through a 3.2 positioning groove; the 5 end cover is provided with a 5.1 glue storage groove, and the 5.1 glue storage groove is integrally formed on the outer wall of the press-fit joint of the 5 end cover and the 1 iron shell along the circumferential direction.

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

(1) The motor with the same traditional outer diameter has larger noise, the special-shaped sintered NdFeB magnet designed at present and the space between the magnet and the magnet are reduced, and the special-shaped magnet can play a role in reducing cogging torque and has obvious motor noise reduction effect.

(2) The traditional motor is generally provided with only one waveform gasket, only one pelin has the pre-compression of eliminating the pelin Lin Youxi, and the other pelin Lin Youxi is not eliminated; the scheme of assembling the wave-shaped gaskets on the front and rear pegs is designed at present, and the two pegs have precompression to eliminate the play of the pegs; the aim of eliminating the play of the Pelin by applying pre-pressure before and after the Pelin is achieved, so that the service life of the motor is prolonged, and the noise of the motor is reduced.

(3) The traditional motor bridge wire needs to be manually tidied, and the bridge wire is shifted to the step position of the stator assembly bracket, so that the bracket has the risk of being pressed to the bridge wire when being assembled to the stator; the encapsulated injection molding stator with the bridge wire retainer ring is designed, and all bridge wires can be blocked outside the retainer ring, so that the situation that the bridge wires are crushed by a bracket and electric leakage occurs is avoided; because the stator is provided with the bridge wire baffle ring, the traditional bridge wire insulating sleeve can be replaced, materials and processes can be reduced, the cost is reduced, and the motor competitiveness is improved.

(4) The earless clamp spring is designed at present, special tools are not required to assemble, the old assembling mode and the clamp spring are required to be assembled manually one by one, but the earless clamp spring is only required to be pressed into a clamp spring groove of the shaft from top to bottom through clamping during assembling, so that automatic production can be realized, and the production efficiency is improved.

Drawings

FIG. 1 is a perspective view of the present utility model;

FIG. 2 is a cross-sectional view of the present utility model;

FIG. 3 is a block diagram of a stent of the present utility model;

FIG. 4 is an assembled view of the iron shell of the present utility model;

FIG. 5 is an enlarged view of section A of the present utility model;

FIG. 6 is a block diagram of an encapsulated injection molded stator of the present utility model;

FIG. 7 is a diagram of a wave washer configuration of the present utility model;

FIG. 8 is a block diagram of an earless snap spring of the present utility model;

FIG. 9 is a diagram of the structure of the insulating paper for the bracket of the present utility model;

FIG. 10 is a front view of the present utility model;

fig. 11 is a functional schematic of a lead assembly of the present utility model.

In the figure: 1 iron shell, 2 controller, 3 support, 3.1 die sinking support, 3.2 constant head tank, 4 lead wire assembly, 5 end cover, 5.1 glue storage tank, 6 encapsulation injection molding stator, 6.1 chip, 6.2 encapsulation plastic, 7.1 bearing A, 7.2 bearing B, 8 shaft, 9 magnetite, 10 winding, 11 wave form gasket, 12 support insulating paper, 13 no ear jump ring.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1-11, the present utility model provides a technical solution: the miniature outer rotor brushless motor comprises a motor rotor assembly, wherein the motor rotor assembly comprises a 1 iron shell, a 5 end cover, an 8 shaft, a 9 magnet, a 7.1 bearing and the like; the stator assembly is composed of a 4-lead assembly, a 3-bracket, a 6-encapsulated injection-molded stator, 10 windings, 12-bracket insulating paper, a 2-controller and the like; the stator assembly is assembled to the rotor assembly, an 11 wave washer is placed in the front Pelin chamber and the rear Pelin Lin Shi of the bracket respectively, a 7.2 bearing is pressed in, and then a 13 lug-free clamp spring is arranged on the shaft, so that the rotor is not loosened, and the motor is assembled.

The 8 shafts are pressed into the shaft holes of the 5 end covers after being drilled with eight centipoises, so that the holding force between the shafts and the end covers is increased; the 5.1 glue storage groove of the 5 end cover can be used for storing glue, so that the holding force between the 1 iron shell and the 5 end cover is increased; pressing a 7.1 bearing on the shaft to form a rotor assembly; the contact surface of the controller and the bracket is stuck with 12 bracket insulating paper, and the bracket insulating paper is assembled on the bracket 3 by screws, so that a bracket assembly is assembled; 6, after the stator assembly is wound with 10 windings, glue is added into the inner hole of the chip, positioning convex points aligning to the bracket and positioning grooves of the stator chip are arranged on the bracket assembly, and common ends of UVW and wire tails of the 10 windings are respectively welded on corresponding bonding pads of the 2 controller; the stator assembly is assembled; then placing 11 wave-shaped gaskets in the bracket bearing chamber at the controller end, and loading the wave-shaped gaskets on the rotor assembly; respectively placing 11 waveform gaskets in a bracket front perlin chamber and a bracket rear perlin Lin Shi; the front and rear pelin are tightly matched with the 8 shafts, and in order to prevent the rotor from loosening, a 13 aurictless snap spring is additionally arranged on the shafts to block the stator assembly; the controller is provided with a 4-lead assembly; after the positive and negative currents on the controller are electrified, the motor normally operates; the functions of PWM speed regulation, start-stop, signal output and NTC are designed on a 2 controller with limited area.

The miniature brushless motor is characterized in that VCC and GND in the 1-lead assembly are connected with DC12.0V power supply, and current flows into 10 windings through the 2-built-in controller, so that a magnetic field is generated, and the current interacts with the magnetic field generated by the permanent magnets of the rotor part to rotate the rotor assembly; the various signals of the motor are output through a 4-wire assembly on a 2-in controller.

Providing a special-shaped sintered NdFeB magnet, such as an accessory shape; one surface of the stator is tightly attached to the iron shell of the rotor, the curved surface is the same as the iron shell, so that the stator is convenient to be tightly adhered, and the other surface of the stator is irregularly oriented to the stator, so that cogging torque is reduced; the motor with the outer diameter of 42 is 12 slots and 10 poles, and the gap between 10 special-shaped magnets is 0-0.6.

Providing a design scheme that wave gaskets are assembled on the front and rear of the pelargonium, wherein the pelargonium is assembled on the front end of a motor rotor, a wave gasket which is designed is firstly added on the front part Lin Shi of a stator and then assembled with a rotor assembly, the wave gasket is propped against the pelargonium Lin Waijuan, and the pre-pressure just used for the pelargonium eliminates the play of the pelargonium; before the post-culture is arranged at the bracket end of the stator, a designed waveform gasket is added to the post-culture Lin Shi of the stator, and then the post-culture is pressed in, and the waveform gasket is propped against the culture Lin Waijuan.

An encapsulated injection molded stator is designed with a gap bridge wire retainer (refer to the attached drawing), and the encapsulated injection molded stator is free from spraying insulating powder, so that all the gap bridge wires can be blocked outside the retainer of the encapsulated stator.

The earless clamp spring is designed, special tools are not required to be assembled, the old assembling mode and the clamp spring are required to be assembled manually one by one, but only the clamp spring groove of the shaft is required to be pressed from top to bottom through clamping during the assembly of the earless clamp spring, automatic goods production can be realized, and the production efficiency is improved.

The embodiments of the present utility model have been described in detail with reference to the accompanying drawings, but the present utility model is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present utility model.

Claims

1. Miniature external rotor brushless motor, its characterized in that includes:

the device comprises an iron shell (1), a controller (2), a lead assembly (4) and a shaft (8), wherein the controller (2) is arranged at an end opening of the iron shell (1), a cover (5) end is pressed at the bottom of the iron shell (1), a bracket (3) which is in butt joint with an end cover (5) is pressed between the iron shell (1) and a through hole of the controller (2), the shaft (8) is arranged between the iron shell (1), the controller (2), the bracket (3) and the end cover (5), the bracket (3) is movably connected with an encapsulation injection molding stator (6) at the outer wall of the inner side of the iron shell (1), a magnet (9) is arranged between the iron shell (1) and the encapsulation injection molding stator (6), and the magnet (9) is pressed at the inner side of the iron shell (1) and consists of ten groups of strip magnets with fusiform sections;

bearing A (7.1) and bearing B (7.2) are arranged between the support (3) and the shaft (8) in a pressing mode, the bearing A (7.1) and the bearing B (7.2) are respectively arranged in a front culture room and a rear culture room of the support (3), a group of waveform gaskets (11) are arranged between the bearing A (7.1) and the bearing B (7.2) and the front culture room and the rear culture room of the support (3), the waveform gaskets (11) are of a waveform annular structure, and an auricular clamp spring (13) is connected between the bearing B (7.2) and the shaft (8).

2. The miniature external rotor brushless motor of claim 1, wherein: the encapsulation injection molding stator (6) consists of a chip (6.1) and encapsulation plastic (6.2), and the chip (6.1) is adhered to the outer wall of the encapsulation plastic (6.2); a winding (10) is wound on the encapsulation plastic (6.2).

3. The miniature external rotor brushless motor of claim 2, wherein: and (12) bracket insulating paper with the same shape as the bracket insulating paper is attached to one surface of the controller (2) far away from the iron shell (1), and the bracket insulating paper (12) is made of DM composite insulating paper.

4. A miniature external rotor brushless motor according to claim 3, wherein: the bracket (3) consists of a die opening bracket (3.1) and a positioning groove (3.2), and the positioning groove (3.2) is integrally formed at the outer wall of the die opening bracket (3.1) along the axial direction of the die opening bracket (3.1); the bracket (3) is assembled and connected with the encapsulated injection-molded stator (6) through the positioning groove (3.2).

5. The miniature external rotor brushless motor of claim 4, wherein: the end cover (5) is provided with a glue storage groove (5.1), and the glue storage groove (5.1) is integrally formed on the outer wall of the press-fit joint of the end cover (5) and the iron shell (1) along the circumferential direction.