CN113922561A

CN113922561A - Micro motor

Info

Publication number: CN113922561A
Application number: CN202110869752.1A
Authority: CN
Inventors: 伍云龙; 袁榜; 金万兵
Original assignee: Shanghai Moons Electric Co Ltd
Current assignee: Shanghai Moons Electric Co Ltd
Priority date: 2021-07-30
Filing date: 2021-07-30
Publication date: 2022-01-11

Abstract

The invention relates to a micro motor which comprises a stator assembly, a rotor assembly, a bearing system and a Hall assembly, wherein the bearing system comprises a front oil-retaining bearing and a rear oil-retaining bearing which are integrally designed by end cover bearings; after aligning a first positioning hole of the front oil-retaining bearing with a back electromotive force signal zero-crossing center line of the stator component, pressing the stator component into the stator component, and then loading the stator component into the rotor component; the second positioning hole of the rear oil-retaining bearing is aligned with the positioning hole of the front oil-retaining bearing and then is pressed into the corresponding position of the stator assembly, the Hall assembly is installed on the rear oil-retaining bearing, and the Hall support positioning column of the Hall assembly is axially installed in place after being inserted into the positioning hole of the rear oil-retaining bearing. Compared with the prior art, the invention has the advantages of stable support, high reliability, compact structure, high performance, long service life, low cost and the like.

Description

Micro motor

Technical Field

The invention relates to a motor, in particular to a micro motor.

Background

The existing micro motor adopts a front end cover and a rear end cover in design, then a bearing chamber is processed in the end covers to form a part of the motor in an assembly mode, and for the micro motor using a sliding bearing. This conventional design additionally increases manufacturing assembly costs.

Meanwhile, part of the motors adopt a bearing and end cover assembly mode, the bearing space is limited greatly, the bearing design is single, and the bearing is small in size and is mostly of a regular cylinder structure. The long-acting external oil supplement cannot be realized, the initial loss of the motor is large, the noise is large, and the service life is poor. In addition, for the motor using the sliding bearing, the design form of the bearing and the end cover is adopted, and for the sliding bearing, extra assembly errors are introduced, the assembly difficulty is increased, and the rejection rate is improved.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a micro motor which is stable in support, high in reliability, compact in structure, high in performance, long in service life and low in cost.

The purpose of the invention can be realized by the following technical scheme:

according to one aspect of the invention, the invention provides a micro motor which comprises a stator assembly, a rotor assembly, a bearing system and a Hall assembly, wherein the bearing system comprises a front oil-containing bearing and a rear oil-containing bearing which are integrally designed by end cover bearings;

after aligning a first positioning hole of the front oil-retaining bearing with a back electromotive force signal zero-crossing center line of the stator component, pressing the stator component into the stator component, and then loading the stator component into the rotor component; the second positioning hole of the rear oil-retaining bearing is aligned with the positioning hole of the front oil-retaining bearing and then is pressed into the corresponding position of the stator assembly, the Hall assembly is installed on the rear oil-retaining bearing, and the Hall support positioning column of the Hall assembly is axially installed in place after being inserted into the positioning hole of the rear oil-retaining bearing.

As a preferred technical scheme, the stator assembly comprises a stator insulating gasket, a machine shell, a stator core, a coil and a power line PCB;

the coil and stator core fixed, coil and power line PCB welding and point glue fixed, stator core outer wall and casing point glue fixed, stator core and coil pass through stator insulating pad and preceding oiliness bearing insulation isolation.

Preferably, the coil and the stator core are bonded and fixed by epoxy resin.

As a preferred technical scheme, the stator core is insulated by PVD vapor deposition.

As the optimized technical scheme, the rotor assembly comprises main magnetic steel, a rotating shaft and a rotor wear-resistant gasket, wherein the main magnetic steel is bonded with the rotating shaft through anaerobic adhesive, and the inner ring of the rotor wear-resistant gasket is slightly interfered with the rotating shaft.

As a preferable technical scheme, the main magnetic steel and the rotating shaft are fixedly bonded through anaerobic glue.

As a preferable technical scheme, the front oil-retaining bearing is provided with a first positioning hole, the rear oil-retaining bearing is provided with a second positioning hole, and the second positioning hole is aligned with the first positioning hole during installation.

According to the preferable technical scheme, the Hall assembly comprises Hall magnetic steel, a Hall PCB support and a Hall PCB, the Hall magnetic steel is fixed with the rotating shaft through anaerobic adhesive, the Hall PCB is bonded with the Hall PCB support and then placed into the tail portion of the motor, the positioning holes of the Hall support positioning column and the rear oil-containing bearing are aligned, and the tail portion is sealed and fixed.

As the preferred technical scheme, the Hall PCB support is provided with a positioning column.

As a preferable technical scheme, the front oil-containing bearing and the rear oil-containing bearing are both provided with an external oil supplementing and storing space.

Compared with the prior art, the invention has the following advantages:

1) the motor adopts the integrated design of the end cover bearing, namely, the oil-containing bearing is the motor end cover. The design enables the motor to be capable of realizing minimum error accumulation in the radial direction and not to be blocked under the condition of small clearance fit of the rotating shaft and the bearing. The assembly process is greatly simplified, and the assembly qualification rate is improved.

2) The motor of the invention has great advantages in manufacturing cost and process cost because two end covers are omitted.

3) The design of the large bearing of the motor greatly increases the oil storage capacity of the oil bearing, so that the service life of the motor is greatly prolonged. The service life of the motor is far longer than that of the motor with the conventional structure.

4) The motor of the invention increases extra space for externally supplementing lubricant, and can realize good sealing through the gasket on the rotor, thereby not causing internal pollution. The initial friction loss and noise decibel value of the motor are reduced functionally. The durability of the motor is prolonged.

5) The motor adopts the bearing to replace the interference fit of the end cover and the shell, can reduce the deformation of the whole motor supporting system in high and low temperature environments as much as possible, and reduces the influence on the concentricity of the bearing to the minimum.

6) The whole assembly process of the motor does not relate to the processes of threading and welding wires among the components, so that the operation is simplified and the efficiency is improved.

Drawings

FIG. 1 is a schematic structural view of the motor of the present invention;

FIG. 2 is a schematic view of a front oil retaining bearing of the present invention;

FIG. 3 is a schematic cross-sectional view of a front oil retaining bearing of the present invention;

FIG. 4 is a schematic view of the construction of a rear oil-retaining bearing of the present invention;

FIG. 5 is a schematic cross-sectional view of a rear oil impregnated bearing of the present invention;

FIG. 6 is a schematic front view of a Hall bracket according to the present invention;

FIG. 7 is a schematic rear view of the Hall bracket according to the present invention;

the structure comprises a bearing, a rotor, a power line PCB, a rear oil-retaining bearing, a Hall magnetic steel, a Hall PCB support, a Hall PCB, a signal wire harness, a power wire harness, a first positioning hole, a second positioning hole, an external oil-supplementing oil-storing space and a Hall support positioning column, wherein the bearing comprises a front oil-retaining bearing 1, a rotating shaft 2, an external lubricant, a stator insulating gasket 4, a rotor wear-resisting gasket 5, a machine shell 6, a stator core 7, a coil 8, a main magnetic steel 9, a power line PCB10, a rear oil-retaining bearing 11, the Hall magnetic steel 12, the Hall PCB support 13, the Hall PCB14, the signal wire harness 15, the power wire harness 16, the first positioning hole 17, the second positioning hole 18, the external oil-supplementing oil-storing space 19 and the Hall support positioning column 20.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.

As shown in fig. 1, a micro motor comprises a stator assembly, a rotor assembly, a bearing system and a hall assembly, wherein the bearing system comprises a front oil-retaining bearing 1 and a rear oil-retaining bearing 11 which are integrally designed by end covers and bearings; the front oil-retaining bearing 1 and the rear oil-retaining bearing 11 are both provided with an external oil supplementing and storing space 19.

The first positioning hole 17 of the front oil-retaining bearing 1 is aligned with the zero-crossing center line of the back electromotive force signal (electric signal) of the stator assembly and then pressed into the stator assembly, and at the moment, the position of the mechanical positioning hole of the front bearing is the position of the zero-crossing position of the back electromotive force signal. Then the rotor component is arranged; the second positioning hole 18 of the rear oil-retaining bearing 11 is aligned with the positioning hole of the front oil-retaining bearing 1 and then is pressed into the corresponding position of the stator component; namely, the position of the rear bearing positioning hole is ensured to be consistent with the zero crossing position of the back electromotive force signal. The Hall assembly is arranged on the rear bearing, and the Hall support positioning column 20 of the Hall assembly is axially arranged in place after being inserted into the rear bearing positioning hole, so that the zero crossing point of a counter potential signal and the zero crossing point of a Hall signal can be ensured to coincide. The electrical performance of the motor is ensured to be normal by a mechanical positioning mode, and a phase adjusting step is omitted. And then, the tail part of the motor is encapsulated and sealed to meet a certain IP grade requirement.

The stator assembly comprises a stator insulating gasket 4, a machine shell 6, a stator core 7, a coil 8 and a power line PCB 10; the coil 8 is fixed with the stator core 7, the coil 8 and the power line PCB10 are welded and fixed by glue dispensing, the stator core 7, the coil 8 and the power line PCB10 are manufactured into components and then placed in a proper position of the shell, and the glue dispensing on the outer wall of the core is fixed with the shell; and the stator core 7 and the coil 8 are insulated and isolated from the front oil-retaining bearing 1 through a stator insulating gasket 4. And the coil 8 and the stator core 7 are bonded and fixed through epoxy resin. The stator core 7 is insulated by PVD vapor deposition.

The front oil-retaining bearing 1 is provided with a first positioning hole 17, the rear oil-retaining bearing 11 is provided with a second positioning hole 18, and the second positioning hole 18 is aligned with the first positioning hole 17 during installation. After the stator assembly is completed, the position of a back electromotive force signal zero crossing point can be determined by electrifying the stator phases, the front oil-retaining bearing 1 is pressed at the position, the first positioning hole 17 of the front oil-retaining bearing 1 is consistent with the position of the back electromotive force signal zero crossing point, and the position of an electric signal is converted into mechanical positioning. The front oil-retaining bearing 1 is pressed in place and then loaded into the rotor assembly. The rear oil-retaining bearing 11 is also provided with a second positioning hole 18, and after the rotor assembly is placed in the rear oil-retaining bearing, the second positioning hole 18 of the rear bearing is aligned with the first positioning hole 17 of the front bearing and then pressed into the corresponding position of the machine shell.

The rotor assembly comprises main magnetic steel 9, a rotating shaft 2 and a rotor wear-resistant gasket 5, the main magnetic steel 9 and the rotating shaft 2 are fixed by anaerobic adhesive, and the inner ring of the rotor wear-resistant gasket 5 is in micro-interference connection with the rotating shaft 2. The main magnet steel 9 and the rotating shaft 2 are fixedly connected through anaerobic glue.

The Hall assembly comprises Hall magnetic steel 12, a Hall PCB support 13 and a Hall PCB14, the Hall magnetic steel 12 is fixed with the rotating shaft 2 through anaerobic adhesive, and the Hall PCB14 is bonded with the Hall PCB support 13 and then is put into the tail part of the motor.

The Hall PCB support is bonded with the Hall PCB in advance, and then the Hall PCB support is placed at the tail of the motor. The Hall sensing distance is controlled by the height of the Hall support. The positioning columns are designed on the Hall PCB support, so that a certain position relation between a PCB Hall signal zero crossing point and a counter potential signal zero crossing point can be ensured, and complicated steps of Hall phase adjustment of a traditional motor are omitted. After the Hall assembly is installed in place, the tail of the motor is sealed through UV glue or epoxy resin, and certain IP protection level requirements and salt spray requirements are met. In the assembly process of all the motors, welding wires are all carried out outside the shell, the stator and the Hall assembly are assembled in a modular mode, the trouble that the traditional motor needs internal threading and welding wires is avoided, and the motor assembly is efficient, quick and reliable.

While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The miniature motor is characterized by comprising a stator assembly, a rotor assembly, a bearing system and a Hall assembly, wherein the bearing system comprises a front oil-retaining bearing (1) and a rear oil-retaining bearing (11) which are integrally designed by end cover bearings;

a first positioning hole (17) of the front oil-retaining bearing (1) is aligned with a back electromotive force signal zero-crossing center line of the stator assembly, then the stator assembly is pressed in, and then the stator assembly is installed in the rotor assembly; and a second positioning hole (18) of the rear oil-retaining bearing (11) is aligned with a positioning hole of the front oil-retaining bearing (1) and then is pressed into a corresponding position of the positioning component, the Hall component is installed on the rear oil-retaining bearing (11), and the Hall support positioning column (20) of the Hall component is axially installed in place after being inserted into the positioning hole of the rear oil-retaining bearing (11).

2. The micromotor according to claim 1, wherein the stator assembly comprises a stator insulating spacer (4), a machine shell (6), a stator core (7), a coil (8) and a power line PCB (10);

coil (8) and stator core (7) fixed, coil (8) and power line PCB (10) welding and point glue fixed, stator core (7) outer wall and casing (6) point glue fixed, stator core (7) and coil (8) through stator insulating pad (4) with preceding oiliness bearing (1) insulating isolation.

3. A miniature motor as claimed in claim 2, wherein said coil (8) and stator core (7) are adhesively secured by epoxy resin.

4. A miniature motor according to claim 2, wherein said stator core (7) is an insulated stator core obtained by PVD vapor deposition.

5. The micro-motor according to claim 1, wherein the rotor assembly comprises a main magnet steel (9), a rotating shaft (2) and a rotor wear-resistant gasket (5), the main magnet steel (9) is bonded with the rotating shaft (2) by anaerobic adhesive, and the inner ring of the rotor wear-resistant gasket (5) slightly interferes with the rotating shaft (2).

6. A miniature motor according to claim 5, wherein said main magnet steel (9) and said shaft (2) are fixed by anaerobic adhesive.

7. A miniature motor as claimed in claim 1, wherein said front oil retaining bearing (1) is provided with a first positioning hole (17), said rear oil retaining bearing (11) is provided with a second positioning hole (18), and said second positioning hole (18) and said first positioning hole (17) are aligned when mounted.

8. The micro-motor according to claim 5, wherein the Hall assembly comprises Hall magnetic steel (12), a Hall PCB support (13) and a Hall PCB (14), the Hall magnetic steel (12) and the rotating shaft (2) are fixed through anaerobic adhesive, the Hall PCB (14) and the Hall PCB support (13) are bonded and then put into the tail portion of the motor, positioning holes of the Hall support positioning column (20) and the rear oil-containing bearing (11) are aligned, and the tail portion is fixed through sealing adhesive.

9. A miniature motor according to claim 8, wherein said Hall PCB support (13) is provided with positioning posts (20).

10. A miniature motor according to claim 8, wherein said front (1) and rear (11) oil-impregnated bearings are provided with an external oil-replenishing and oil-storing space (19).