CN116317293A

CN116317293A - High-speed motor

Info

Publication number: CN116317293A
Application number: CN202211106369.1A
Authority: CN
Inventors: 李文科
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-09-11
Filing date: 2022-09-11
Publication date: 2023-06-23

Abstract

The invention discloses a high-speed motor, which comprises a shell, wherein the shell is divided into two parts in the length direction, namely a first shell and a second shell, the two parts of the shell are combined to form a cylindrical structure with an air duct, two bearing mounting seats are integrally formed at two ends of the first shell and the first shell, two bearing mounting grooves are formed in the bearing mounting seats in a one-step processing mode, and two bearings are respectively arranged in the bearing mounting grooves; the rotor assembly and the stator assembly are arranged in the cavity between the two bearing mounting grooves. According to the invention, the motor shell with the air duct is designed into two parts, two finished bearing mounting grooves are formed on one part of the motor shell at one time, and the concentricity of the two bearings is ensured by changing the structure and adjusting the processing process steps, so that the motor can still stably work at an ultrahigh rotating speed, and the whole motor can achieve better quality and longer service life.

Description

High-speed motor

Technical Field

The present invention relates to a high-speed motor, in particular a small or miniature high-speed brushless motor suitable for a hair dryer.

Background

At present, high-speed blowers are pursued by more and more consumers, and therefore, the requirement for a high-speed motor as a power part of the high-speed blower is also higher and higher. A high-speed motor for a blower is required to be provided with: the requirements of miniature, high speed and low noise, among which how to realize the stability of the motor at high rotation speed and prolong the service life, are one of the problems that the technology needs to be continuously discussed.

The structure of the traditional motor mainly comprises a stator component, a rotor component and bearings respectively positioned at two ends of a rotor magnet; this construction and mounting is not problematic at low rotational speeds, large bearings, and large torques, but is not required in small motors or miniature motors, especially at rotational speeds in excess of 5 tens of thousands of revolutions per minute, if smaller precision bearings are required. As shown in the chinese patent application with application number 201911219908.0 in fig. 1, a structural design of an ultra-high speed wind motor is disclosed, wherein two bearings are respectively located at two sides of a rotor 40, a first bearing 90 is located in an air duct housing 10 (near one end of a fan blade 20), and a second bearing 110 is located in a rear end cover 60; in actual production and use, the structure cannot avoid the error of concentricity of the bearings at two ends during installation, thereby bringing corresponding technical problems and quality problems.

In order to solve the problem of inconsistent concentricity of the bearings, the motor is designed and processed into a single cantilever structure, namely two bearings are arranged on one side of a rotor magnet, as shown in the Chinese patent application of application number 201611140022.3 in fig. 2, a bearing assembly 23 (comprising a pair of

bearings

25b and 25 b) is fixed on one side of the magnet 22, and the structure is beneficial to ensuring that the two bearings can finish high-precision positioning and mounting at one time and ensuring concentric mounting of the two bearings; however, this brings new problems: because the motor rotation speed is high, the rotor magnet part is positioned on one side and has larger centrifugal force, the motor rotor swings when started for a long time, the dynamic balance is poor, and noise is generated or other faults are caused.

In summary, in the prior art, for small or micro high-speed motors, especially for blowers, different problems are caused by the fact that bearings are respectively mounted on both sides of the rotor magnet as in the conventional structure, or on one side of the rotor magnet. In view of this, the present invention provides a completely new solution.

Disclosure of Invention

The invention aims to provide a high-speed motor so as to realize high-precision concentric installation of bearings at two ends of a small or miniature high-speed motor.

It is still another object of the present invention to provide a high speed motor to further reduce noise.

It is a further object of the present invention to provide a high speed motor to further increase shaft and bearing life.

It is a further object of the present invention to provide a high speed motor to further ensure that the bearing is pre-stressed during the full life cycle to adjust the bearing play.

The technical scheme adopted by the invention is as follows: the high-speed motor comprises a shell, wherein the shell is divided into two parts in the length direction, namely a first shell and a second shell, the two parts of the shell are combined to form a cylindrical structure with an air duct, two bearing mounting seats are integrally formed at two ends of the first shell and the first shell, two bearing mounting grooves are formed in the bearing mounting seats in a one-step machining mode, and the two bearings are respectively arranged in the bearing mounting grooves; the rotor assembly and the stator assembly are arranged in the cavity between the two bearing mounting grooves.

Preferably, two pre-stressing springs or two pre-stressing washers are further provided between the two bearings and the rotor magnets of the rotor assembly.

Preferably, at the end of the bearing remote from the impeller, a pre-compression spring and a hole retainer ring are further provided, or a pre-compression washer is provided.

The method for installing the high-speed motor comprises the steps of firstly adopting a first shell and a second shell which are integrally molded by die casting, powder metallurgy injection molding or CNC processing and provided with an air duct, wherein two bearing installation seats are integrally molded at two ends of the first shell, two bearing installation grooves are processed in the bearing installation seats in a one-time CNC finish machining mode, firstly installing a bearing close to one side of an impeller in the bearing installation grooves, and then placing a combined stator assembly in a cavity between two bearing seats; penetrating the combined shaft, the rotor magnet of the rotor assembly and the bearing far away from the impeller from the bearing mounting seat on one side far away from the impeller and penetrating through the center of the stator assembly; the shaft passes through a bearing close to one side of the impeller and is pressed into the impeller; and finally, welding or bonding the second shell and the first shell into a cylindrical whole with an air duct.

Preferably, before or after the step of pressing the impeller, the method further comprises the step of placing a pre-compression spring in a bearing mounting seat at one side far away from the impeller and installing a hole retainer ring.

As another structural mode of the invention, a high-speed motor comprises a shell, wherein the shell is of a cylindrical structure with a wall surface provided with a mounting hole and an air duct, a cavity is formed in the cylindrical shell corresponding to the mounting hole, and a motor stator component and a motor rotor component are arranged in the cavity; two bearing mounting seats are integrally formed on two sides of the cavity and with the cylindrical inner wall surface, two bearing mounting grooves are formed in the bearing mounting seats in one step, and two bearings are respectively arranged in the bearing mounting grooves; the mounting hole is sealed by a mounting window to form a complete cylindrical structure with an air duct.

Preferably, the mounting hole is rectangular.

Preferably, two pre-compression springs or two pre-compression washers are further provided between the two bearings and the rotor magnets of the rotor assembly.

Preferably, at the end of the bearing remote from the impeller, a pre-compression spring and a hole retainer ring, or a pre-compression washer, are provided.

The method for installing the high-speed motor comprises the steps of adopting a cylindrical structure which is integrally die-cast or powder metallurgy injection molding or CNC processing, provided with an air duct and provided with an installing hole, forming an inner double-layer wall surface and an outer double-layer wall surface, integrally forming bearing installing seats at two ends of the inner wall surface, and processing two bearing installing grooves in the bearing installing seats in a one-time CNC finish machining mode; the stator assembly is arranged in a cavity between two bearing seats from the mounting hole, the bearing and the rotor assembly are respectively arranged at two ends of the bearing mounting groove, and then the impeller is pressed in; the mounting window which is integrally die-cast, powder metallurgy injection molding or CNC processing is welded or adhered in the mounting hole, so that a cylindrical whole body with an air duct is formed.

The high-speed motor has the advantages and effects that: according to the invention, the motor shell with the air duct is designed into two parts, two finished bearing mounting grooves are formed on one part of the motor shell at one time, and the concentricity of the two bearings is ensured by changing the structure and adjusting the processing process steps, so that the motor can still stably work at an ultrahigh rotating speed, and the whole motor can achieve better quality and longer service life.

Drawings

FIG. 1 is a schematic view of a prior art 1

FIG. 2 is a schematic diagram of a structure of a prior art 2

FIG. 3 is an exploded view showing the structure of a high-speed motor according to embodiment 1 of the present invention

FIG. 4 is an exploded view showing the structure of the housing in embodiment 1 of the present invention

FIG. 5 is an exploded view showing the structure of a high-speed motor according to embodiment 2 of the present invention

FIG. 6 is an exploded view showing the structure of a high-speed motor according to embodiment 3 of the present invention

FIG. 7 is an exploded view showing the structure of a high-speed motor according to embodiment 4 of the present invention

FIG. 8 is an exploded view showing the structure of a high-speed motor according to embodiment 6 of the present invention

FIG. 9 is an exploded view showing the structure of a housing according to embodiment 6 of the present invention

The labels in the figures are as follows:

111. 111 '-stator 112, 112' -coil support

113. 113 '-coil 114, 114' -terminal

121. 121 '-rotor magnet 122, 122' -shaft

123. 123' -bearing 124-precompression washer

125. 125' -precompression spring 127-hole retainer ring

13. 13' -impeller

141. 141 '-terminal bracket 142, 142' -circuit board

143. 143' -wire holder

15. 15' -housing 151-first housing

152-

second shell

153, 153', 153 "-reinforcing deflector rib

1511. 1511 '-inner wall surface 1512, 1512' -bearing mount

1513. 1513 '-bearing mounting groove 1514, 1514' -cavity

154-mounting hole 155-mounting window

Detailed Description

The technical scheme of the invention is further described below with reference to the accompanying drawings.

Example 1

As shown in fig. 3, the present invention provides a high-speed motor, which is particularly applicable to a high-speed electric hair dryer, and mainly includes: stator assembly, rotor assembly, wiring assembly, impeller 13 and housing 15 for receiving and securing the above components.

The stator assembly comprises a stator 111, a coil bracket 112, a coil 113 and a binding post 114;

the rotor assembly comprises a rotor magnet 121, a shaft 122, two bearings 123;

the wiring assembly comprises a wiring terminal bracket 141, a circuit board 142 and a wiring seat 143;

the components are conventional parts of the blower high-speed motor, and specific selection and assembly processes can be selected and adjusted according to requirements, and are not repeated here.

As shown in fig. 4, the housing 15 is divided into two parts in the length direction, specifically, a first housing 151 and a second housing 152, and the two parts of housings are combined to form a cylindrical structure with an air duct, the cylindrical structure has inner and outer double-layer wall surfaces, and reinforcing guide ribs 153 are uniformly distributed between the double-layer wall surfaces, and the reinforcing guide ribs can provide rigid support for the motor housing and guide the wind entering the blower. In order to enable the two parts of the shell to be provided with the inner double-layer wall surface and the outer double-layer wall surface after being combined to form an air duct, the first shell and the second shell are respectively provided with the inner double-layer wall surface and the outer double-layer wall surface; bearing mounting seats 1512 are integrally formed at two ends of the inner wall surface 1511 of the first shell and the first shell, two bearing mounting grooves 1513 are formed in the bearing mounting seats in a CNC finish machining mode, and two bearings of the rotor assembly are respectively arranged in the bearing mounting grooves; the rotor magnet of the rotor assembly and the stator assembly are disposed within the cavity 1514 between the two bearing mounting slots.

Example 2

As another structural form of the present invention, this embodiment 2 further includes, on the basis of the above-described embodiment 1, two pre-compression washers 124 respectively provided between the two bearings 123 and the rotor magnet 121, as shown in fig. 5.

Example 3

As another structural form of the present invention, this embodiment 3 further includes, on the basis of the above-described embodiment 1, two pre-compression springs 125 respectively disposed between two bearings 123 and the rotor magnet 121 through two copper bushings (between the springs and the shaft, not shown), as shown in fig. 6.

Example 4

As another structural form of the present invention, this embodiment 4 is based on the above embodiment 1, in which a pre-compression spring 125' and a retainer ring 126 for hole (shown in fig. 7) or a pre-compression washer (not shown) are provided in a bearing mount at an end remote from the impeller (the height of the bearing mount may be increased as needed, as shown in fig. 4).

Example 5

The present embodiment provides a method for installing the high-speed motor of the foregoing embodiment 4, which specifically includes the following steps:

s1, a first shell and a second shell which are integrally die-cast, powder metallurgy injection-molded or CNC processed and provided with an air duct (namely, a plurality of reinforcing guide ribs are uniformly distributed in the inner and outer double-layer wall surfaces of the shell), wherein bearing mounting seats are integrally formed at two ends of the inner wall surface of the first shell and the first shell;

s2, machining two concentric bearing mounting grooves in bearing mounting seats at two ends of the first shell in a one-time CNC finish machining mode;

s31, firstly, mounting a bearing close to one side of an impeller in a bearing mounting groove in a clearance fit manner, and then placing a combined stator assembly (comprising a stator, a coil bracket, a coil and a binding post) in a cavity between two bearing seats;

s32, penetrating the combined shaft, the rotor magnet and the bearing far away from the impeller from a bearing mounting seat on the side far away from the impeller and penetrating through the center of the stator assembly;

s33, the shaft penetrates through the bearing hole which is arranged on one side, close to the impeller, of the S31 and is pressed into the impeller;

s34, placing a pre-pressure spring in a bearing mounting seat at one side far away from the impeller, and mounting a check ring for a hole;

s4, welding or bonding the second shell and the first shell into a cylindrical whole with an air duct;

s5, connecting a wiring assembly comprising a wiring terminal bracket, a circuit board and a wiring seat with a wiring terminal of the stator assembly, and thus completing the whole process flow.

The above embodiments 1-3 are mainly distinguished by whether a pre-compression washer or a pre-compression spring is installed, and the adjustment of the installation position, as will be appreciated by the person skilled in the art and with reference to the above method.

Example 6

As another structural mode of the present invention, as shown in fig. 8, a high-speed motor of the present embodiment is particularly applicable to a high-speed electric hair dryer, and the motor mainly includes: stator assembly, rotor assembly, wiring assembly, impeller 13 'and housing 15' for receiving and securing the above components.

The stator assembly includes a stator 111', a coil support 112', a coil 113', a terminal 114';

the rotor assembly comprises a rotor magnet 121', a shaft 122', two bearings 123';

the wiring assembly comprises a wiring terminal bracket 141', a circuit board 142' and a wiring seat 143';

As shown in fig. 9, the housing 15 'is a cylindrical structure with mounting holes 154 on the wall surface and an air duct, the cylindrical structure has inner and outer double wall surfaces, and reinforcing guide ribs 153' are uniformly distributed between the double wall surfaces, and the reinforcing guide ribs can provide rigid support for the motor housing and guide the wind entering the blower. The cylindrical shell corresponding to the mounting hole 154 is internally provided with a cavity 1514' which can accommodate the stator assembly and the rotor assembly of the motor; the cylindrical inner wall surfaces 1511' on both sides of the cavity are provided with bearing mounting seats 1512' for accommodating two bearings, and two bearing mounting grooves 1513' are formed in the bearing mounting seats at one time in a CNC finish machining mode; the mounting aperture 154 is closed by a mounting window 155 which is shaped to fit the aperture, in this embodiment rectangular; meanwhile, the installation window is also of an inner-outer double-layer wall surface structure and is provided with reinforcing guide ribs 153', so that the installation window and the whole shell form a complete cylindrical structure with an air duct after being assembled.

Preferably, a pre-compression washer or a pre-compression spring is further arranged between the two bearings of the present embodiment and the rotor magnet of the rotor assembly, and specific reference is made to the foregoing embodiments 2 and 3; alternatively, a precompression spring and a hole retainer ring are provided in a bearing mount far from one end of the impeller, or a precompression washer is provided, and reference is made to the foregoing embodiment 4 for a specific manner; and will not be described in detail herein.

Example 7

The present embodiment provides a method for installing the high-speed motor of the above embodiment 6, specifically as follows:

s1, firstly adopting an integral die casting or powder metallurgy injection molding or CNC processing cylindrical structure with an air duct and provided with a mounting hole, forming the cylindrical structure into an inner double-layer wall surface and an outer double-layer wall surface, uniformly distributing a plurality of reinforcing guide ribs in the inner double-layer wall surface, simultaneously forming bearing mounting seats at both ends of the inner wall surface and the shell integrally,

s2, machining two bearing mounting grooves in bearing mounting seats at two ends of the inner wall surface of the shell in a one-time CNC finish machining mode;

s31, placing the combined stator assembly (comprising a stator, a coil bracket, a coil and a binding post) in a cavity between two bearing seats;

s32, respectively loading the bearing and the rotor assembly from two ends of the bearing mounting groove;

s33, pressing in an impeller;

s4, welding or bonding an installation window which is integrally die-cast or powder metallurgy injection molding or CNC processing into an installation hole of the shell to form a cylindrical whole body with an air duct;

It will be appreciated that reference is made to the above method as one of ordinary skill in the art to achieve adjustment of whether a pre-stressed washer or spring is installed, and the mounting location.

It should be noted that the high-speed motor provided by the invention can be applied to the relevant fields of electric hair drier, bladeless fan, negative pressure dust collector, hand drier, bathroom drying and the like. Directional terms referred to in this application are, for example: upper, lower, left, right, front, rear, inner, outer, side, etc., are only with reference to the directions of the drawings. In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be. Meanwhile, it will be understood by those of ordinary skill in the art that in the embodiments of the present invention, many technical details are set forth in order to better understand the present invention. However, even without these technical details and various changes and modifications based on the above embodiments, can be made and implemented without departing from the scope of protection defined by the claims of the present invention.

Claims

1. A high speed motor, characterized by: the device comprises a shell, wherein the shell is divided into two parts in the length direction, namely a first shell and a second shell, the two parts of the shell are combined to form a cylindrical structure with an air duct, two bearing mounting seats are integrally formed at two ends of the first shell and the first shell, two bearing mounting grooves are formed in the bearing mounting seats in a one-step machining mode, and the two bearings are respectively arranged in the bearing mounting grooves; the rotor assembly and the stator assembly are arranged in the cavity between the two bearing mounting grooves.

2. A high speed motor as claimed in claim 1, wherein: at the end of the bearing remote from the impeller, a pre-compression spring and a hole retainer ring are further provided, or a pre-compression washer is provided.

3. A high speed motor as claimed in claim 1, wherein: two pre-compression springs or two pre-compression washers are further provided between the two bearings and the rotor magnets of the rotor assembly.

4. A method of installing a high speed motor, characterized by: the method comprises the steps of firstly adopting a first shell and a second shell which are integrally die-cast or powder metallurgy injection molding or CNC processing and provided with an air duct, wherein two bearing mounting seats are integrally formed at two ends of the first shell, two bearing mounting grooves are processed in the bearing mounting seats in a one-time CNC finish machining mode, firstly, a bearing close to one side of an impeller is mounted in the bearing mounting grooves, and then, a combined stator assembly is placed in a cavity between two bearing seats; penetrating the combined shaft, the rotor magnet of the rotor assembly and the bearing far away from the impeller from the bearing mounting seat on one side far away from the impeller and penetrating through the center of the stator assembly; the shaft passes through a bearing close to one side of the impeller and is pressed into the impeller; and finally, welding or bonding the second shell and the first shell into a cylindrical whole with an air duct.

5. The method of installing a high-speed motor according to claim 4, further comprising the step of installing a pre-compression spring in a bearing mount at a side far from the impeller before or after the step of pressing the impeller, and installing a hole spring.

6. A high speed motor, characterized by: the motor comprises a shell, wherein the shell is of a cylindrical structure with a wall surface provided with a mounting hole and an air duct, a cavity is formed in the cylindrical shell corresponding to the mounting hole, and a motor stator assembly and a motor rotor assembly are arranged in the cavity; two bearing mounting seats are integrally formed on two sides of the cavity and with the cylindrical inner wall surface, two bearing mounting grooves are formed in the bearing mounting seats in one step, and two bearings are respectively arranged in the bearing mounting grooves; the mounting hole is sealed by a mounting window to form a complete cylindrical structure with an air duct.

7. A high speed motor as claimed in claim 6, wherein: the mounting hole is rectangular.

8. A high speed motor as claimed in claim 6, wherein: at the end of the bearing remote from the impeller, a pre-compression spring and a circlip for the bore are provided, or a pre-compression washer is provided.

9. A high speed motor as claimed in claim 6, wherein: between the two bearings and the rotor magnet, two pre-compression springs or two pre-compression washers are further provided.

10. A method of installing a high speed motor, characterized by: firstly, adopting a cylindrical structure which is integrally die-cast, powder metallurgy injection molding or CNC (computer numerical control) processing, provided with an air duct and provided with a mounting hole, wherein the cylindrical structure is formed into an inner wall surface and an outer wall surface, two ends of the inner wall surface are integrally formed with bearing mounting seats, and two bearing mounting grooves are processed in the bearing mounting seats in a one-time CNC finish machining mode; the stator assembly is arranged in a cavity between two bearing seats from the mounting hole, the bearing and the rotor assembly are respectively arranged at two ends of the bearing mounting groove, and then the impeller is pressed in; and the mounting window which is integrally die-cast or powder metallurgy injection molding or CNC processing is welded or adhered in the mounting hole, so that a cylindrical whole body with an air duct is formed.

11. A method of installing a high speed motor as in claim 10, wherein: before or after the step of pressing the impeller, the method further comprises the step of placing a pre-compression spring in a bearing mounting seat at one side far away from the impeller and mounting a retainer ring for holes.