CN214674597U

CN214674597U - Permanent magnet DC brushless motor

Info

Publication number: CN214674597U
Application number: CN202120739238.1U
Authority: CN
Inventors: 谭绍敏
Original assignee: TAISHAN JIANGKOU ELECTRIC APPLIANCE MANUFACTORY Ltd
Current assignee: TAISHAN JIANGKOU ELECTRIC APPLIANCE MANUFACTORY Ltd
Priority date: 2021-04-12
Filing date: 2021-04-12
Publication date: 2021-11-09
Anticipated expiration: 2031-04-12

Abstract

The utility model discloses a permanent magnet DC brushless motor, which comprises a shell, an installation fixing plate, a rear end cover, an armature assembly and a rotor assembly; the front end face of the machine shell is fixed on the mounting fixing plate, the armature assembly is arranged in the machine shell, the rotor assembly is arranged in the armature assembly, and the rear end cover is connected with the rear end face of the machine shell; the armature assembly is assembled in the installation cavity of the shell in an interference fit mode. Permanent magnetism direct current brushless motor guaranteed smoothness, the part after the armature subassembly casing of impressing complex stability within a definite time, improved the inside high temperature of motor and leaded to glue inefficacy to arouse the problem of motor function inefficacy.

Description

Permanent magnet DC brushless motor

Technical Field

The utility model relates to the technical field of electric machines, especially, relate to a permanent magnet direct current brushless motor.

Background

The electronic power-assisted brake system achieves the purpose of quick response braking by means of the permanent magnet direct current brushless motor and utilizing the characteristics of quick response and stable output, so that the potential safety hazard of failure of the vacuum power-assisted brake system after the engine is shut down is effectively avoided. Under the condition that the requirements of new energy automobiles on the working conditions in automobiles are gradually strict, the requirements for keeping the parts stable and outputting the torque stable under the severe operating conditions are higher and higher, the insulation grade of the existing permanent magnet direct current brushless motor basically meets the F grade (155 ℃), and obviously, the insulation grade of the F grade is not enough to meet the requirements which are gradually strict.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a permanent magnetism direct current brushless motor that stability is higher, efficiency is higher, the performance is stronger to effectively solve prior art's weak point.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a permanent magnet DC brushless motor comprises a shell, a mounting fixing plate, a rear end cover, an armature assembly and a rotor assembly; the front end face of the machine shell is fixed on the mounting fixing plate, the armature assembly is arranged in the machine shell, the rotor assembly is arranged in the armature assembly, and the rear end cover is connected with the rear end face of the machine shell; the armature assembly is assembled in the installation cavity of the shell in an interference fit mode.

Compared with the prior art, permanent magnetism direct current brushless motor guaranteed that smoothness, the part after the armature assembly casing of impressing complex stability within a definite time, improved the inside high temperature of motor and leaded to the glue inefficacy to arouse the problem of motor functional failure.

Further, the armature assembly comprises a stator core, an enameled wire, a terminal fixing plate and a wiring terminal; the stator core is formed by splicing a plurality of single-tooth cores into a ring shape, and the outer surface of each single-tooth core is wrapped with a layer of high-temperature resistant material; the enameled wire is wound on the stator iron core; the terminal fixing plate is arranged above the stator core and provided with three terminal slots, and grooves are uniformly formed in the circumference of the terminal fixing plate; the wiring terminal is fixed in the slot on the terminal fixing plate.

Furthermore, the installation cavity of the shell is divided into a guide section and an interference fit section along a central axis; the inner diameter of the guide section is larger than the outer diameter of the stator core; the inner diameter of the interference fit section is slightly smaller than the minimum outer diameter of the stator core. The guide section can guide the stator core to be smoothly installed to the interference fit section.

Further, when the radial dimension of the terminal fixing plate is greater than the radial dimension of the stator core, the guide section is divided into a first guide portion and a second guide portion, and the inner diameter of the first guide portion is greater than the outer diameter of the second guide portion.

Further, the high-temperature resistant material is a PPS-140A1 high-temperature resistant material.

Further, the rotor assembly comprises a rotating shaft, a rotor core sleeved outside the rotating shaft, a plurality of arc-shaped magnetic steels attached to the circumferential surface of the rotor core, and a rotor sheath sleeved outside the magnetic steels.

Further, the magnetic steel is made of high-temperature-resistant magnetic iron N45 UH.

Further, the rotating shaft is fixedly arranged in the center of the machine shell.

Furthermore, the magnetic ring is in interference fit with the rotating shaft.

Furthermore, the stator core is formed by splicing 12 single-tooth cores, the enameled wire is formed by winding 4 single-tooth cores as a group on the stator core in a triangular winding mode.

Drawings

Fig. 1 is an exploded view of a permanent magnet dc brushless motor according to the present invention;

fig. 2 is a schematic view of the overall structure of the permanent magnet dc brushless motor according to the present invention;

fig. 3 is a schematic structural view of the armature assembly of the present invention;

fig. 4 is a partial cross-sectional structural view of a single encapsulated core according to the present invention;

fig. 5 is a schematic structural diagram of the housing of the present invention;

fig. 6 is a schematic structural view of the rotor assembly of the present invention;

fig. 7 is a schematic structural view of the rotor assembly according to the present invention after the rotor sheath is hidden;

wherein the reference numerals are: 1. a housing; 2. mounting a fixed plate; 3. an armature assembly; 4. a rotor assembly; 5. a rear end cap; 6. a magnetic ring; 111. a first guide portion; 112. a second guide portion; 31. a stator core; 311. a single-tooth iron core; 312. an encapsulating material; 33. a terminal fixing plate; 34. a wiring terminal; 331. a slot; 41. a rotating shaft; 42. a rotor core; 43. magnetic steel; 44. a rotor sheath.

Detailed Description

The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and embodiments.

Please refer to fig. 1, which is an exploded view of the permanent magnet dc brushless motor according to the present invention. The permanent magnet direct current brushless motor comprises a shell 1, a mounting fixing plate 2, an armature component 3, a rotor component 4, a rear end cover 5 and a magnet ring 6; the front end face of the machine shell 1 is fixed on the installation fixing plate 2, the armature component 3 is installed in the machine shell 1, the rotor component 4 is installed in the armature component 3, the rear end cover 5 is connected with the rear end face of the machine shell 1, and the armature component 3 is assembled in an installation cavity of the machine shell 1 in an interference fit mode.

Please refer to fig. 3, which is a schematic structural diagram of the armature assembly 3 of the present invention. The armature assembly 3 includes a stator core 31, an enamel wire, a terminal fixing plate 33, and a connection terminal 34. Please refer to fig. 4, which is a schematic structural diagram of a single encapsulated core according to the present invention. The stator core 31 is formed by splicing a plurality of encapsulated cores into a ring shape, each encapsulated core is obtained by encapsulating a single-tooth core 311 by a high-temperature resistant material PPS-140A1, enameled wires are respectively wound on each encapsulated core, and then the encapsulated cores wound with the enameled wires are spliced into the ring-shaped stator core 31. The terminal fixing plate 33 is fixedly installed above the stator core 31, three terminal slots 331 are uniformly distributed in 30 degrees on the terminal fixing plate 33, and grooves are uniformly formed in the circumference of the terminal fixing plate 33; the terminal block 34 is fixed in the insertion groove 331 of the terminal fixing plate 33. The stator core 31 is formed by splicing 12 single-tooth cores 311 processed by an encapsulation process, and the enameled wires are wound on the stator core 31 in a triangular winding manner by taking 4 encapsulated cores as a group.

Please refer to fig. 5, which is a schematic structural diagram of the housing 1 according to the present invention. The installation cavity of the casing 1 is divided into a guide section and an interference fit section along a central axis, and the inner diameter of the guide section is larger than the outer diameter of the stator core 31; the inner diameter of the interference fit section is slightly smaller than the minimum outer diameter of the stator core 31. Wherein, the direction section is close to casing 1 rear end face, and interference fit section is close to casing 1 preceding terminal surface.

The radial dimension of the terminal fixing plate 33 is greater than the radial dimension of the stator core 31, the guide section includes a first guide portion 111 and a second guide portion 112, the inner diameter of the first guide portion 111 is greater than the inner diameter of the second guide portion 112, and the first guide portion 111 is close to the rear end face of the housing 1.

Please refer to fig. 6 and fig. 7, which are schematic structural views of the rotor assembly 4 according to the present invention. The rotor assembly 4 comprises a rotating shaft 41, a rotor core 42, magnetic steel 43 and a rotor sheath 44; the rotor core 42 is sleeved outside the rotating shaft 41, the magnetic steel 43 is formed by attaching a plurality of arc-shaped magnetic steels 43 to the circumferential surface of the rotor core 42, and the rotor sheath 44 is sleeved outside the magnetic steel 43; the rotating shaft 41 is fixedly arranged in the center of the inner cavity of the casing 1, and the magnetic ring 6 is in interference fit with the rotating shaft 41.

To sum up, the permanent magnet direct current brushless motor of the utility model carries out the encapsulation treatment of the prior art to the single-tooth iron core by adopting the high temperature resistant material, and then splices the encapsulated single-tooth iron core into the annular stator iron core, and the high temperature resistant material enables the armature assembly to work in the high temperature environment of 180 ℃, thereby improving the insulation grade of the motor and effectively improving the stability and the insulativity between the iron core and the enameled wire; the single-tooth iron cores are spliced into a circle, so that the size of a notch is reduced, the cogging torque of the motor is reduced, the vibration of the motor is reduced, the noise is reduced, the winding resistance is reduced, the copper consumption is effectively reduced, and the temperature inside the motor is reduced to a certain extent.

The interference fit of the armature assembly and the inner cavity of the shell is related to the circumferential groove of the terminal fixing plate, so that when the armature assembly is pressed into the shell, the pressing tool has enough space to contact with the stator core, the pressure applied to each single-tooth core is uniform, the flatness is high after the armature assembly is pressed into the shell, and the problem that the function of the motor fails due to the fact that glue fails due to the fact that high temperature inside the motor is improved is solved.

Adopt the magnet steel that high temperature resistant magnetism iron N45UH made, adopt the surface mounting formula structure, paste a plurality of convex magnet steels on rotor core circumference surface, assist and wrap up magnet steel, rotor with the rotor sheath, fixed magnet steel, rotor core isotructure when reducing magnet steel magnetic leakage phenomenon to guarantee that the rotor can be under high temperature environment high-speed even running.

Compared with the prior art, the permanent magnet direct current brushless motor ensures the smoothness of the armature assembly after being pressed into the shell and the stability of fit among parts, and solves the problem that the function of the motor fails due to glue failure caused by high temperature inside the motor; the structure is more stable and reliable, the efficiency is higher, the performance is stronger, the insulation grade is higher, and the electronic power-assisted brake system is suitable for the electronic power-assisted brake system which needs to provide instantaneous stable power output.

The above-mentioned embodiments only represent one embodiment of the present invention, and the description thereof is specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention.

Claims

1. A permanent magnet DC brushless motor comprises a shell, a mounting fixing plate, a rear end cover, an armature assembly and a rotor assembly; the front end face of the machine shell is fixed on the mounting fixing plate, the armature assembly is arranged in the machine shell, the rotor assembly is arranged in the armature assembly, and the rear end cover is connected with the rear end face of the machine shell; wherein the armature assembly is assembled in the installation cavity of the shell in an interference fit mode.

2. The permanent magnet brushless dc motor according to claim 1, wherein the armature assembly includes a stator core, an enamel wire, a terminal fixing plate, and a terminal block;

the stator core is formed by splicing a plurality of single-tooth cores into a ring shape, and the outer surface of each single-tooth core is wrapped with a layer of high-temperature resistant material; the enameled wire is wound on the stator iron core; the terminal fixing plate is arranged above the stator core and provided with three terminal slots, and grooves are uniformly formed in the circumference of the terminal fixing plate; the wiring terminal is fixed in the slot on the terminal fixing plate.

3. The permanent magnet brushless dc motor according to claim 2, wherein the mounting cavity of the housing is divided into a guide section and an interference fit section along a central axis; the inner diameter of the guide section is larger than the outer diameter of the stator core; the inner diameter of the interference fit section is slightly smaller than the minimum outer diameter of the stator core.

4. The permanent magnet brushless dc motor according to claim 3, wherein: when the radial dimension of the terminal fixing plate is larger than that of the stator core, the guide section is divided into a first guide part and a second guide part, and the inner diameter of the first guide part is larger than the outer diameter of the second guide part.

5. The permanent magnet brushless dc motor according to claim 2, wherein: the high-temperature resistant material is PPS-140A1 high-temperature resistant material.

6. The permanent magnet brushless dc motor according to claim 1, wherein: the rotor assembly comprises a rotating shaft, a rotor core, a plurality of arc-shaped magnetic steels and a rotor sheath, wherein the rotor core is sleeved outside the rotating shaft, the plurality of arc-shaped magnetic steels are attached to the circumferential surface of the rotor core, and the rotor sheath is sleeved outside the magnetic steels.

7. The permanent magnet brushless dc motor according to claim 6, wherein: the magnetic steel is made of high-temperature-resistant magnetic iron N45 UH.

8. The permanent magnet brushless dc motor according to claim 6, wherein: the rotating shaft is fixedly arranged in the center of the machine shell.

9. The permanent magnet brushless dc motor according to claim 6, wherein: the magnetic ring is in interference fit with the rotating shaft.

10. The permanent magnet brushless dc motor according to claim 2, wherein: the stator core is formed by splicing 12 single-tooth cores, the enameled wire is formed by taking 4 single-tooth cores as a group, and the enameled wire is wound on the stator core in a triangular winding mode.