WO2017036056A1

WO2017036056A1 - Direct-current permanent magnet brush electrical motor

Info

Publication number: WO2017036056A1
Application number: PCT/CN2016/000474
Authority: WO
Inventors: 刘小波
Original assignee: 刘小波
Priority date: 2015-09-06
Filing date: 2016-08-22
Publication date: 2017-03-09

Abstract

Disclosed is a direct-current permanent magnet brush electrical motor (100), comprising a stator assembly (41), a rotor assembly (55) and a first end cover component (52), wherein the stator assembly comprises a magnetic yoke (31) and magnetic steel (8); the stator assembly further comprises a stator housing (32) for partially covering the magnetic yoke; and the stator housing and a first end cover (42) of the first end cover component are both of a structure integrally formed with a mould. The direct-current permanent magnet brush electrical motor has a high machining precision, is few in number of parts and components and simple in assembly, has an easily guaranteed assembly precision, and has low costs.

Description

DC permanent magnet brush motor

Technical field

The invention belongs to the technical field of DC permanent magnet motor, and relates to a DC permanent magnet brush motor, in particular to a DC permanent magnet brush motor with a casing injection molded by a mold.

Background technique

The DC permanent magnet motor is a DC motor that uses a permanent magnet to establish a magnetic field. The DC permanent magnet motor can be divided into a DC permanent magnet brushless motor and a DC permanent magnet brush motor according to the presence or absence of a brush. DC permanent magnet brush motors are widely used in various electrical equipment or appliances that require rotational power, and their performance has an important impact on many equipments.

FIG. 1 is a schematic view showing the basic structure of a conventional DC permanent magnet brush motor assembly. The DC permanent magnet brush motor is illustrated by a two-pole blower motor. As shown in FIG. 1 , the DC permanent magnet brush motor assembly 10 mainly includes a stator assembly 110, a small end cap assembly 120, and a large end cap assembly 130. Rotor assembly 140, bracket 150 and plug harness 160. In the prior art, the stator assembly 110, the small end cap assembly 120 and the large end cap assembly 130 comprise a wide variety of components, which are mainly formed by a stamping process, which is complicated to process and has high processing precision, so that the total motor The assembly process of the 110 is not only complicated, but also the assembly accuracy is difficult to ensure (for example, the coaxiality deviation after assembly is easily excessive).

In view of this, it is necessary to propose a new type of DC permanent magnet brush motor.

Summary of the invention

The object of the present invention is to provide a DC permanent magnet brush motor which is simple in assembly and easy to ensure assembly accuracy.

To achieve the above or other objects, the present invention provides a DC permanent magnet brush motor comprising mainly a stator assembly, a rotor assembly and a first end cap member, the stator assembly including a yoke and a magnetic steel; wherein the stator The assembly also includes a stator housing for at least partially encasing the yoke, the stator housing and the first end cap of the first end cap member each being a mold integrally formed structure.

A DC permanent magnet brush motor according to an embodiment of the present invention, wherein the rotor assembly includes two ball bearings mounted on a rotor central shaft of the rotor assembly;

The stator casing includes a second end cover integrally formed therewith, the second end cover Positioned at one end of the stator casing, the second end cover is provided with a first bearing chamber;

a second bearing chamber is disposed in the first end cover;

Wherein the first bearing chamber and the second bearing chamber are coaxially disposed, and two ball bearings mounted on a rotor central shaft of the rotor assembly (55) are coaxially mounted on the first bearing chamber and the housing, respectively Said in the second bearing chamber.

In an alternative embodiment, the rotor assembly has no ball bearings mounted on the central axis of the rotor; the stator housing includes a second end cap integrally formed therewith, the second end cap being disposed at one end of the stator housing a second bearing chamber is disposed in the second end cover;

a second bearing chamber is disposed in the first end cover;

Wherein the first bearing chamber and the second bearing chamber are coaxially disposed, and two oil bearing are installed in the first bearing chamber and the second bearing chamber, respectively.

Preferably, the stator casing is injection molded together with the second end cap to form a unitary structure.

Preferably, the first end cover and the stator casing are positioned by a stop structure.

Preferably, the second end cover is provided with a first ventilation hole, and the first end cover is provided with a second ventilation hole.

Preferably, the first end cap member includes a brush plate, and the plug wire harness of the DC permanent magnet brush motor is directly drawn from the brush plate before the brush plate is mounted to the inside of the first end cap.

Optionally, the first end cover member includes a brush board, and after the brush board is mounted to the inside of the first end cover, the plug wire harness of the DC permanent magnet brush motor passes through the adapter blade from the brush Lead out on the board.

Preferably, the stator casing and the first end cap are injection molded by a corresponding mold.

Preferably, the yoke is placed in the mold, and after injection molding, a stator casing in which the yoke is fixed is formed.

Optionally, the stator housing is first injection molded through the mold prior to installation of the yoke.

Optionally, a notch for mounting the magnetic steel in the inner ring of the yoke is disposed in the stator casing, the magnetic steel is directly inserted into the notch, or the magnetic is used to glue the magnetic The steel is bonded in the notch, or the magnetic steel is first fixed in the yoke and placed in an injection mold through injection molding to be fixed in the notch.

Optionally, there is no injection molded body inside the yoke, and the magnetic steel is fixed on the yoke by glue bonding or tension of an elastic member.

A DC permanent magnet brush motor according to an embodiment of the present invention, wherein the yoke is a steel pipe structure.

Preferably, the yoke is formed by cutting a steel pipe.

Preferably, the yoke thickness is set according to a predetermined magnetic flux.

Optionally, the yoke has a thickness greater than or equal to 1.5 mm and less than or equal to 8 mm.

Optionally, the DC permanent magnet brush motor is a DC permanent magnet brushed two-pole blower motor or a DC permanent magnet brushed four-stage cooling motor.

The technical effect of the present invention is that the stator casing and the end cover of the DC permanent magnet brush motor are integrally formed into a mold, and the machining precision is high, the components are small, the assembly is simple, the assembly precision is easily ensured, and the cost is low.

DRAWINGS

The above and other objects and advantages of the present invention will become more fully apparent from the aspects of the appended claims.

1 is a schematic view showing the basic structure of a conventional DC permanent magnet brush motor assembly.

2 is a schematic structural view of a stator assembly of the DC permanent magnet brush motor assembly of FIG. 1, wherein FIG. 2(a) is an assembly view of the stator assembly, and FIG. 2(b) is a structural schematic view of the assembled stator assembly. .

3 is a schematic structural view of the small end cap assembly of the DC permanent magnet brush motor assembly of FIG. 1, wherein FIG. 3(a) is an assembly view of the small end cap assembly, and FIG. 3(b) is a small assembly. Schematic diagram of the structure of the end cap assembly.

4 is a structural schematic view of the large end cap assembly of the DC permanent magnet brush motor assembly of FIG. 1, wherein FIG. 4(a) is an assembly view of the large end cap assembly, and FIG. 4(b) is a large assembly. Schematic diagram of the structure of the end cap assembly.

5 is a structural schematic view of the large end cap assembly of the large end cap assembly of FIG. 4, wherein FIG. 5(a) is an assembled view of the big end cap assembly, and FIG. 5(b) is an assembled big end cap assembly. Schematic.

6 is a schematic structural view of a rotor assembly of the DC permanent magnet brush motor assembly of FIG. 1, wherein FIG. 6(a) is an assembly view of the rotor assembly, and FIG. 6(b) is a structural schematic view of the assembled rotor assembly. .

7 is a schematic structural view of a motor main body of the DC permanent magnet brush motor assembly of FIG. 1, wherein FIG. 7(a) is an assembly view of the motor main body, and FIG. 7(b) is a structural schematic view of the assembled motor main body. .

8 is a schematic structural view of the DC permanent magnet brush motor assembly of FIG. 1, wherein FIG. 8(a) is an assembly drawing of a DC permanent magnet brush motor assembly, and FIG. 8(b) is a DC permanent after assembly. Schematic diagram of the structure of the magnetic brush motor assembly.

9 is a schematic structural view of a stator assembly of a DC permanent magnet brush motor according to an embodiment of the present invention, wherein FIG. 9(a) is a right side view of the stator assembly (with a second end cover), and FIG. 9(b) is a stator. A cross-sectional view of the assembly (with a second end cap).

Figure 10 is a schematic view showing the structure of a yoke of a stator assembly according to an embodiment of the present invention, wherein Figure 10(a) is a front view of the yoke and Figure 10(b) is a left side view of the yoke.

11 is a schematic structural view of a first end cap assembly of a DC permanent magnet brush motor according to an embodiment of the present invention, wherein FIG. 11(a) is an assembly view of the first end cap assembly, and FIG. 11(b) is assembled. A structural view of the first end cap assembly.

12 is a schematic structural view of a rotor assembly of a DC permanent magnet brush motor according to an embodiment of the present invention, wherein FIG. 12(a) is an assembly view of the rotor assembly, and FIG. 12(b) is a structural view of the assembled rotor assembly. .

13 is a schematic structural view of a DC permanent magnet brush motor according to an embodiment of the present invention, wherein FIG. 13(a) is an assembly drawing of a DC permanent magnet brush motor, and FIG. 13(b) is a DC permanent magnet after assembly. The structure diagram of the brush motor.

14 is a schematic structural view of a DC permanent magnet brushed two-pole motor according to an embodiment of the present invention, wherein FIG. 14(a) is a right side view, FIG. 14(b) is a front view, and FIG. 14(c) is a left side view.

15 is a schematic structural view of a DC permanent magnet brushed four-stage motor according to an embodiment of the present invention, wherein FIG. 15(a) is a right side view, FIG. 15(b) is a front view, and FIG. 15(c) is a left side view. .

detailed description

The following is a description of some of the various possible embodiments of the invention, which are intended to provide a basic understanding of the invention and are not intended to identify key or critical elements of the invention or the scope of the invention. It is to be understood that, in accordance with the technical aspects of the present invention, those skilled in the art can suggest other alternatives that are interchangeable without departing from the spirit of the invention. Therefore, the following detailed description and the accompanying drawings are merely illustrative of the embodiments of the invention, and are not intended to

In order to make the improvement and advantages of the DC permanent magnet brush motor of the embodiment of the present invention more obvious, firstly, the specific structure of the DC permanent magnet brush motor assembly shown in FIG. 1 and the existing problems thereof are decomposed and detailed, The problems existing in the prior art are made more apparent. However, it should be understood that the DC permanent magnet brush motor of the present invention is not limited to the improved formation of the DC permanent magnet brush motor based on the embodiment shown in FIG.

2 is a structural schematic view of the stator assembly of the DC permanent magnet brush motor assembly of FIG. 1, wherein FIG. 2(a) is an assembly view of the stator assembly, and FIG. 2(b) is an assembled stator assembly. Schematic.

As shown in FIG. 2, the stator assembly 110 mainly includes a yoke 111, a magnetic steel 112, a leaf spring 113, and a rivet 114 for assembly; wherein the yoke 111 mainly functions as a magnetic guide, and as the performance of the magnetic steel 112 increases, It is necessary to have a sufficient magnetic cross-sectional area, and a sufficient magnetic cross-sectional area is realized by increasing the thickness of the yoke 111. The yoke 111 of the embodiment shown in Fig. 2 is wound by two layers of steel plates, and the two steel plates are respectively wound. In a substantially cylindrical shape, each layer of steel plate adopts a dovetail structure 1111 to achieve fastening of both ends of the steel plate; and, due to corrosion resistance requirements, the surface of the yoke 111 is galvanized; therefore, the manufacturing and assembly of the yoke 111 itself The process is complicated. When the stator assembly 110 is installed, the magnetized magnetic steel 112 is first positioned in the yoke 111, and the magnetic steel 112 is pressed inside the yoke 111 by the reed 113, and the hole 1131 on the reed 113 is secured. Aligning the hole 1112 in the yoke 112, after the reed 113 is disintegrated from the inside, the yoke 114 is passed from the outside of the yoke 111 through the hole 1112 in the yoke 111 and riveted into the hole 1131 of the reed 113; the reed 113 Made of an elastic material, which plays a role in positioning and fastening the magnetic steel 112 in the circumferential direction and the axial direction in the yoke 111; Both the reed 113 and the surface of the rivet 114 are required to be rustproofed.

3 is a structural schematic view of the small end cap assembly of the DC permanent magnet brush motor assembly of FIG. 1, wherein FIG. 3(a) is an assembly view of the small end cap assembly, and FIG. 3(b) is assembled. Schematic diagram of the small end cap assembly.

As shown in FIG. 3, the small end cap assembly 120 mainly includes a small end cap 121, an oil bearing 122, a compression spring 123 and a gland 124; the small end cap 121 is provided with four stamped rivets 1211. During the assembly of the small end cap assembly 120, the oil bearing 122, the compression spring 123 and the gland 124 are sequentially mounted on the small end cap 121, and the rivet 1241 on the gland 124 is aligned with the rivet on the small end cap 121. After 1211, the rivet 1211 is further crimped into a round head 1212. The pressure spring 123 is made of an elastic material, the oil bearing 122 is filled with lubricating oil, the surface of the small end cover 121 and the pressure cover 124 needs to be galvanized, and the surface of the compression spring 123 is rustproof. The oil-impregnated bearing 122 has a spherical shape and can be rotated when the compression spring 123 is pressed, and functions as a self-aligning condition in the case where the coaxiality of the assembly is difficult to ensure.

4 is a structural schematic view of the large end cap assembly of the DC permanent magnet brush motor assembly of FIG. 1, wherein FIG. 4(a) is an assembly view of the large end cap assembly, and FIG. 4(b) is assembled. Schematic diagram of the large end cap assembly. Figure 5 is a schematic view showing the structure of the large end cap assembly of the large end cap assembly of Figure 4, wherein Figure 5 (a) is an assembly view of the big end cap assembly, and Figure 5 (b) is a assembled end cap. Schematic diagram of the structure of the component.

As shown in FIGS. 4 and 5, the large end cap assembly 130 mainly includes a brush plate 135 and a large end cap assembly 139; the structure of the big end cap assembly 139 is as shown in FIG. 5, which includes a large end cap 131 and an oil bearing 132. The pressure spring 133 and the gland 134 are assembled. The oil bearing 132, the compression spring 133 and the gland 134 are sequentially mounted on the large end cover 131, and the rivet 1341 on the gland 134 is aligned with the large end cover 131. The punched rivet 1311 is pressed and pressed, and the rivet 1311 is crimped into a round head 1312. Then, as shown in FIG. 4, after the brush plate 135 is mounted on the big end cover assembly 139, four points are punched and riveted at the corresponding portions of the large end cover assembly 139 to form the riveting point 1391, thereby fastening the brush plate 135. On the big end cap assembly 139. And, as shown in Figure 5, the plug in Figure 5 Sheet 136 is used to transfer plug harness 160 later.

6 is a structural schematic view of the rotor assembly of the DC permanent magnet brush motor assembly of FIG. 1, wherein FIG. 6(a) is an assembly view of the rotor assembly, and FIG. 6(b) is an assembled rotor assembly. Schematic.

As shown in FIG. 6, the rotor assembly 140 includes a rotor 141, a retaining ring 142, a grease dam 143 and a grease damper 144; during assembly, the retaining ring 142 is first loaded into the retaining ring groove 1411 on the shaft, and then blocked. The oil ring 143 and the oil retaining ring 144 are mounted.

7 is a schematic structural view of a motor main body of the DC permanent magnet brush motor assembly of FIG. 1, wherein FIG. 7(a) is an assembly view of the motor main body, and FIG. 7(b) is an assembled motor main body. Schematic.

As shown in FIG. 7, a plurality of wear pads 170 are first placed at both ends of the rotor assembly 140, and then placed into the stator assembly 110, and then the small end cover assembly 120 and the large end cover assembly 130 are respectively mounted on both ends of the stator assembly 110. When the small end cap assembly 120 and the large end cap assembly 130 are pressed, the rotor assembly 140 is axially pushed and pulled, the axial clearance of the rotor assembly 140 is measured, and the number of the anti-wear spacers 170 is increased or decreased according to the size of the axial gap. The axial gap of the rotor assembly 140 is made to meet the design requirements; then, under the premise that the small end cap assembly 120 and the large end cap assembly 130 are pressed, the riveting points 191 are formed at both ends of the stator assembly 110 (8 points on one side, A total of 16 points on both sides), thereby fully securing the small end cap assembly 120 and the large end cap assembly 130 to the stator assembly 110.

8 is a structural schematic view of the DC permanent magnet brush motor assembly of FIG. 1, wherein FIG. 8(a) is an assembly drawing of a DC permanent magnet brush motor assembly, and FIG. 8(b) is an assembled view. Schematic diagram of the structure of a DC permanent magnet brush motor assembly.

The assembly of the motor assembly is as shown in FIG. 8. After the barbs 151 of the bracket 150 are aligned with the notches 115 on the stator assembly 110 of the motor body, the bracket 150 is forcedly pushed until the blocking piece 152 at the other end of the bracket 150 abuts the stator assembly 110. The end face, at this time, the barb 151 of the bracket 150 has completely snapped into the notch 115 of the stator assembly 110, so that the bracket 150 is fixed outside the stator assembly 110, and the bracket 150 is used as the outer casing of the stator assembly 110; finally, the plug harness 160 is Insert 161 It interfaces with the tab 136 on the brush plate 135.

The Applicant has found that the DC permanent magnet brush motor 10 shown in Fig. 1 has at least the following disadvantages.

First, the parts are numerous, the processing is complicated, and the machining accuracy is difficult to guarantee. In addition to the rotor, the small end cap assembly, the large end cap assembly and the stator assembly include many components, among which the yoke, the small end cap, the large end cap, the leaf spring and the compression spring are respectively subjected to blanking and stamping. , trimming and other processes, some need to be riveted, some have to be heat treated, but also surface plating and other anti-rust treatment, therefore, from the manufacturing point of view, the processing is very complicated, the processing accuracy is also difficult to guarantee, these constitute Material and processing costs for motor parts.

Second, the assembly process is complicated, the assembly accuracy is poor, and thus the noise problem is easily caused. As can be seen from the above description, the stator assembly 110, the small end cap assembly 120, and the large end cap assembly 130 include numerous components, and the assembly process is complicated, resulting in a very complicated assembly of the motor assembly; thus greatly improving the processing cost of the motor assembly. . Moreover, since the small end cap assembly 120, the large end cap assembly 130 and the yoke 111 all need to adopt a stamping forming process, and it is necessary to use a punching and riveting assembly at the end, the processing precision is difficult to ensure, and the overall assembly precision is difficult to be easily caused. Ensure that, in particular, the small end cap assembly is not guaranteed to be coaxial with the large end cap assembly; poor coaxiality limits must use oil-bearing bearings that are self-aligning, however, due to oil-impregnated bearings and shafts and oil-impregnated bearings There is sliding friction between the anti-wear pad and the large noise when the motor rotates.

Third, the reliability of the assembled motor assembly is poor. Since the assembly of each component is required to be punched and riveted on the press, the final assembly is also punched and riveted together; in order to avoid the wire of the plug harness being damaged during the punching and riveting, the adapter can only be connected after the punching and riveting, and the connection is increased. The problem of poor contact and plug detachment is therefore prone to reliability problems.

Fourth, motor performance is limited. Since the yoke bears the function of the casing on the one hand, the notch of the mounting end cover must be left. On the other hand, the yoke is an important component of the magnetic conduction of the motor, and the thickness of the steel plate directly affects the magnetic flux density and the magnetic resistance. The forming process of the yoke has a limitation on the thickness of the steel plate. Therefore, the performance of the motor is at least easily restricted by the thickness of the steel plate of the yoke; The limit thickness of the coiled plate is 3.5 mm. In the case where the yoke of the single-layer coiled sheet cannot meet the magnetic flux requirement of the high-performance magnetic steel, it must be rolled with two layers of 2 mm steel sheets, which increases the manufacturing difficulty and the processing cost. In order to reduce the cost, there is often a case where the performance of the magnetic steel is sacrificed and the single-layer steel plate is used for press forming, and therefore, the performance of the DC permanent magnet brush motor is limited.

The following embodiments of the present invention overcome at least the disadvantages of at least one aspect of the above DC permanent magnet brush motor.

9 is a schematic structural view of a stator assembly of a DC permanent magnet brush motor according to an embodiment of the present invention, wherein FIG. 9(a) is a right side view of the stator assembly (with a second end cover), and FIG. 9(b) A cross-sectional view of a stator assembly (with a second end cap); FIG. 10 is a schematic view showing the structure of a yoke of a stator assembly according to an embodiment of the present invention, and FIG. 10(a) is a front view of the yoke, FIG. b) is the right side view of the yoke.

First, as shown in Fig. 10, in this embodiment, the yoke 31 has a cylindrical structure, and therefore, can be formed by cutting with a steel pipe of a desired thickness (for example, a seamless steel pipe), and when cutting, a corresponding diameter and thickness are selected. The steel pipe of h is cut in accordance with the length L of the yoke 31. Therefore, the preparation of the yoke 31 is simple and low in cost. The thickness h of the cylindrical wall of the cylindrical yoke 31 is approximately in the range of 1.5 mm ≤ h ≤ 8 mm. For example, h can be equal to 5 mm, which can be flexibly designed according to design parameters such as magnetic flux density and magnetic resistance. Therefore, the performance of the magnetic steel can be fully exerted, and the performance of the DC permanent magnet brush motor of the embodiment of the present invention can be easily ensured.

Continuing with Figure 10, the length L of the yoke 31 is determined by the length of the magnetic steel 8 (shown in Figure 9) to be mounted.

Referring to Figure 9, the stator assembly 41 includes a yoke 31 and a stator housing 32 that substantially encloses the yoke 31. The stator housing 32 is a mold-integrated structure that is injection molded using a corresponding mold. In an embodiment, the stator casing 32 is made of, for example, a plastic material, and the yoke 31 is placed in an injection mold by injection molding, so that the yoke 31 is directly fixed in the stator casing 32, eliminating the installation of the yoke 31. . In still another embodiment, the stator casing 32 may be, but not limited to, a plastic material, for example, an aluminum alloy or the like that can be injection molded, first according to the yoke. 31 and the structural parameters of the magnetic steel 8 to be installed, the corresponding mold is designed, and the corresponding material is injected into the mold to form a mold integrated structure, that is, the stator casing 32, and the yoke 31 can be further installed; or as described above The mold is formed by placing the yoke 31 in a mold and injecting the aluminum alloy.

It should be understood that the design of the mold for integrally forming the mold housing 32 for the mold may be correspondingly designed according to specific structural parameter requirements, for example, may be designed according to matching precision or the like. Therefore, the accuracy of the structural parameters of the stator casing 32 is easily ensured, and is also advantageous for the subsequent assembly process.

Continuing with FIG. 9, the stator casing 32 also covers at least a portion of the inner ring surface of the yoke 31. In the inner ring of the yoke 31 of the stator casing 32, two notches 33 are provided for mounting The magnetic steel 8, the notch 33 is also the mounting opening. The magnetic steel 8 may be directly inserted and fixed. For example, in this embodiment, after the magnetic steel 8 is inserted into the bottom, the joint of the magnetic steel 8 and the yoke 31 is coated with a single-component glue 40; of course, it may be The magnetic steel 8 is first fixed on the yoke 31, and then placed in an injection mold to form a stator by injection molding; the magnetic steel 8 may also be bonded in the notch with glue.

In other embodiments, the stator casing 32 may not cover the inner ring surface of the yoke 31, that is, the inner ring surface of the yoke 31 is exposed, and the magnetic steel 8 is fixed to the magnetic body by glue bonding or tension of the elastic member. On the inner circumference of the yoke 31.

In the portion other than the yoke 31 of the stator casing 32, the outer surface thereof is provided with a bracket 35 required for mounting the motor; the bracket 35 is not limited to the shape shown in the legend; it is understood that the stator casing 32 can be integrated into one body. Injection molding can also be injection molded together with the components to be joined (such as hood, volute, etc.).

As shown in FIG. 9 , in this embodiment, the corresponding second end cover of the stator assembly 41 is also integrally formed, and the stator casing 32 and the second end cover are simultaneously integrally formed by the mold; the second end cover is located in the stator casing. One end face of 32 forms an end cap structure, the second end cap is provided with a plurality of vent holes 36, and at the axial center of the second end cap, a bearing chamber 37 for mounting the ball bearing is provided; it should be understood , the stop 38, the screw hole 39, the vent hole 36, the bearing chamber 37 are They are formed by integral molding of the mold. Therefore, their coaxiality, dimensional accuracy, and the like are easily ensured, and the second end cap does not include additional components, and the overall structure is simple and the preparation is simple.

It should be understood that in yet another embodiment, the second end cap may be separately injection molded, and then the second end cap is assembled and fixed to the stator casing 32 to form a structure similar to that shown in FIG. This embodiment is a bit more complicated than the assembly process.

Continuing with FIG. 9, at the other end of the stator casing 32, a stop 38 for mating with the first end cap and a screw hole 39 for securing the first end cap are provided.

Figure 11 is a schematic view showing the structure of a first end cap assembly of a DC permanent magnet brush motor according to an embodiment of the present invention, wherein Figure 11 (a) is an assembly view of the first end cap assembly, and Figure 11 (b) is A structural view of the assembled first end cap assembly.

In this embodiment, the first end cap assembly 52 is mounted at the other end of the stator housing 32 (the end opposite the second end cap), which primarily includes the first end cap 42 and the brush plate 48, and is electrically The brush plate 48 is coupled to the plug harness 49 prior to assembly. The first end cap 42 is also a mold-integrated structure that is injection molded using a corresponding mold. In one embodiment, the first end cap 42 can be, for example, but not limited to, directly injection molded from a plastic material, and any other material that can be used for integrally forming the mold can be applied to the preparation of the first end cap 42.

Continuing with the opening of the first end cap 42, a port 43 is provided at the port of the first end cap 42 that mates with the stator housing 32, which corresponds to the port 38. At the port of the first end cover 42, a screw hole 44 for assembly is provided, which is disposed corresponding to the screw hole 39 of the stator casing 32. When the first end cover 42 is mounted on the stator assembly 41, the screw hole 39 and the screw hole are provided. 44 is relatively accurate so that it can be easily fixed with self-tapping screws.

Continuing with Figure 11, the first end cap 42 is provided at a suitable location with a venting opening 45 for internal ventilation of the assembled motor.

Continuing as shown in FIG. 11, the inside of the first end cover 42 is provided with a screw hole 46 for fixing the brush plate, and at the axial center of the first end cover, a bearing chamber 47 for mounting a ball bearing is provided, and the bearing chamber 47 is provided. The diameter can be set according to the diameter of the ball bearing to be installed, the bearing chamber 47 Coaxially disposed with the bearing chambers 37 in the second end cap to ensure the coaxiality of the two ball bearings they are mounted on.

It should be understood that the stopper 43, the screw hole 44, the screw hole 46, the vent hole 45, the bearing chamber 47, and the like may be integrally formed by a mold, and therefore, their dimensional accuracy and the like are easily ensured, and the first end cap is not Including additional components, the first end cap 42 has a simple overall structure and is simple to prepare.

Continuing with FIG. 11, in this embodiment, the plug harness 49 is directly drawn from the brush board 48, thus eliminating the need for secondary mounting of the plug harness 49 and avoiding contact failure during secondary mounting. The connector is missing.

Continuing with FIG. 11, the brush plate 48 is provided with a screw hole 50 for mounting corresponding to the screw hole 46 of the first end cover 42, so that the brush plate 48 can be fastened by the tapping screw 51. The interior of the first end cap 42 (shown in Figure 11 (b)) forms a first end cap assembly 52.

12 is a schematic structural view of a rotor assembly of a DC permanent magnet brush motor according to an embodiment of the present invention, wherein FIG. 12(a) is an assembly view of the rotor assembly, and FIG. 12(b) is an assembled rotor assembly. Structure diagram. As shown in FIG. 12, the rotor assembly 55 includes a rotor and a rotor central shaft. The rotor central shaft is provided with a retaining ring groove 53 for accommodating the fixed retaining ring 26. In particular, the rotor assembly 55 further includes two ball bearings 54. They are respectively mounted in the bearing chamber 37 of the second end cap and the bearing chamber 47 of the first end cap after the total assembly. In the assembly of the rotor assembly 55, the retaining ring 26 is first snapped into the retaining ring groove 53 on the rotor shaft, and then the ball bearings 54 are respectively loaded from both ends, thereby assembling to form the rotor assembly 55 as shown in Fig. 12(b). .

13 is a schematic structural view of a DC permanent magnet brush motor according to an embodiment of the present invention, wherein FIG. 13(a) is an assembly diagram of a DC permanent magnet brush motor, and FIG. 13(b) is a DC permanent after assembly. The structure diagram of the magnetic brush motor.

As shown in FIG. 13(a), the DC permanent magnet brush motor 100 of the embodiment of the present invention mainly includes a rotor assembly 55 as shown in FIG. 12, and a first end cap assembly 52 as shown in FIG. Illustrated stator assembly 41 (with a second end cap), further comprising a wave washer 56 for assembly, a pressure plate 57 and tighten the screw 58. In the assembly process of the DC permanent magnet brush motor 100, the wave washer 56 is first loaded into the bearing chamber 37 of the second end cover of the stator assembly 41, and then loaded into the rotor assembly 55, and then the first end cap assembly is correspondingly mounted. 52. At the end of the wire harness 49, press the wire of the wire harness with the pressure plate 57, and tighten with a self-tapping screw 58, and then directly tighten with a self-tapping screw at the other end, thus completing the assembly of the DC permanent magnet brush motor 100. A DC permanent magnet brush motor 100 as shown in Fig. 13 (b) is formed.

The structure and assembly description of the respective components of the DC permanent magnet brush motor 100 of the above embodiment, and the structure of the DC permanent magnet brush motor 100 itself and the assembly description thereof can be understood to have the following advantages.

First, the processing accuracy of each component of the DC permanent magnet brush motor is easily ensured. Since the stator casing 32, the first end cover 42 and the second end cover are both integrally formed by the mold, the machining precision is greatly improved.

Secondly, due to the improved processing precision of the first end cap assembly, the first end cap can be positioned through the end cap and the stopper of the stator casing, and the first end cap and the second end cap have high coaxiality, which can satisfy the use of the ball. The requirements of the bearing, therefore, the use of relatively silent ball bearings, eliminating the sliding friction sound of the motor running, greatly reducing the operating noise of the DC permanent magnet brush motor 100.

Thirdly, a plurality of parts are integrally formed by injection molding, and the components of the rotor assembly and the first end cap assembly are greatly reduced, and the assembly is simple. Among them, the ball bearing replaces the oil bearing, which is also beneficial to reduce the parts of the second end cap, the rotor assembly and the first end cap assembly.

Fourth, the stator casing (including the second end cover) and the first end cover are integrally formed by a mold, which can be integrally formed by injection molding, is simple to prepare, and does not need anti-rust treatment; therefore, the DC permanent magnet brush motor 100 is simple to prepare. .

Fifth, the preparation of the yoke is simple. The yoke can be directly cut and formed by steel pipe. There is no scrap material, the material utilization rate is high, and the production is simple. The outer surface of the yoke is covered by plastic and magnetic steel. It is not necessary to plate the anti-rust layer. It only needs to be transported and processed for the yoke. The process is rust-proof; and the assembly is simple, eliminating the need for multiple steps on the machine during the assembly process.

Sixth, it is easy to maximize the performance of the magnetic steel, which is beneficial to improve the performance of the DC permanent magnet brush motor 100. Since the yoke can be directly cut by a steel pipe, the length can be changed according to the length of the magnetic steel, and the wall thickness can be selected according to the magnetic flux requirement of the magnetic steel, so that the magnetic properties of the magnetic steel can be fully exerted, thereby improving the overall performance of the motor. Level.

Seventh, the overall assembly of the DC permanent magnet brush motor 100 is very simple.

It is to be understood that in other embodiments, the rotor employs a rotor assembly 140 configuration, but instead an oil-impregnated bearing is mounted in each of the bearing chamber 37 and the bearing chamber 47 such that the mute effect is relatively poor relative to the effect of the second aspect.

It should be noted that the DC permanent magnet brush motor 100 of the above embodiment can be applied to both a two-pole motor and a four-stage motor.

14 is a schematic structural view of a DC permanent magnet brushed two-pole motor according to an embodiment of the present invention, wherein FIG. 14(a) is a right side view, FIG. 14(b) is a front view, and FIG. 14(c) is a left view. view.

15 is a schematic structural view of a DC permanent magnet brushed four-stage motor according to an embodiment of the present invention, wherein FIG. 15(a) is a right side view, FIG. 15(b) is a front view, and FIG. 15(c) is a view. Left view.

The motor of the embodiment shown in FIG. 14 and FIG. 15 is basically similar to the structure, preparation method and assembly process of the DC permanent magnet brush motor 100 shown in FIG. 13, and only needs to design a corresponding mold according to specific structural features.

It should be noted that the specific application range of the DC permanent magnet brush motor of the embodiment of the present invention is not limited, for example, it can be used for the driving device required for the automobile air conditioner, and can also be applied to other scenarios similar to the condition requirements.

Although the above description of the present invention has been made by way of example and preferred embodiments, those skilled in the art will recognize that the invention may be in form or detail without departing from the scope and spirit of the invention. Make a change.

Claims

A DC permanent magnet brush motor (100) mainly comprises a stator assembly (41), a rotor assembly (55) and a first end cover member (52), the stator assembly comprising a yoke (31) and a magnetic steel (8) The stator assembly further includes a stator housing (32) for at least partially covering the yoke (31), the stator housing (32) and the first end cap member ( The first end caps (42) of 52) are both mold-integrated structures.
A DC permanent magnet brush motor (100) according to claim 1 wherein:

The rotor assembly (55) includes two ball bearings (54) mounted on a rotor central shaft of the rotor assembly (55);

The stator casing (32) includes a second end cover integrally formed therewith, the second end cover is disposed at one end of the stator casing (32), and the second end cover is provided with a first bearing chamber ( 37);

a second bearing chamber (47) is disposed in the first end cover (42);

Wherein the first bearing chamber (37) and the second bearing chamber (47) are coaxially disposed, and the two ball bearings (54) mounted on the rotor central shaft of the rotor assembly (55) are coaxially mounted separately In the first bearing chamber (37) and the second bearing chamber (47).
A direct current permanent magnet brush motor (100) according to claim 2, wherein said stator casing (32) is injection molded together with said second end cap to form a unitary structure.
A DC permanent magnet brush motor (100) according to claim 2, wherein the first end cap (42) and the stator housing (32) are positioned by a stop structure.
The DC permanent magnet brush motor (100) according to claim 2, wherein the second end cover is provided with a first ventilation hole (36), and the first end cover (42) is provided with a second Ventilation holes (45).
A direct current permanent magnet brush motor (100) according to claim 1 or 2, wherein the first end cap member (52) comprises a brush plate (48).
The DC permanent magnet brush motor (100) of claim 1 wherein said stator housing (32) and said first end cap (42) are injection molded using respective molds.
A DC permanent magnet brush motor (100) according to claim 7, wherein said yoke (31) is placed in said mold, and said yoke (31) is fixed after injection molding. Stator housing (32).
A DC permanent magnet brush motor (100) according to claim 7, wherein said stator casing (32) is first injected through said mold before said yoke (31) is mounted Plastic molding.
A DC permanent magnet brush motor (100) according to claim 1, wherein said stator casing (32) is provided with mounting said magnetic steel (8) on said yoke (31) a notch (33) in the inner ring, the magnetic steel (8) is directly inserted into the notch (33), or the magnetic steel is glued in the notch with glue, or the magnetic is first The steel (8) is fixed in the yoke (31) and placed in an injection mold by injection molding to be fixed in the notch (33), or the magnetic steel is fixed in the yoke by the tension of the elastic member.
A direct current permanent magnet brush motor (100) according to claim 1, wherein said yoke (31) is a steel tube structure.
A direct current permanent magnet brush motor (100) according to claim 11, wherein said yoke (31) is formed by cutting a steel pipe.
A direct current permanent magnet brush motor (100) according to claim 11, wherein the thickness of the yoke (31) is set in accordance with a predetermined magnetic flux.
A direct current permanent magnet brush motor (100) according to claim 11 or 13, wherein the yoke (31) has a thickness greater than or equal to 1.5 mm and less than or equal to 8 mm.
The DC permanent magnet brush motor (100) according to claim 1, wherein the DC permanent magnet brush motor (100) is a DC permanent magnet brushed two-pole blower motor or a DC permanent magnet brushed four-stage. Cool the motor.
The DC permanent magnet brush motor (100) according to claim 1, wherein no ball bearing is mounted on a central axis of the rotor of the rotor assembly (55);

The stator casing (32) includes a second end cover integrally formed therewith, the second end cover is disposed at one end of the stator casing (32), and the second end cover is provided with a first bearing chamber ( 37); the first end cover (42) is provided with a second bearing chamber (47);

Wherein the first bearing chamber (37) and the second bearing chamber (47) are coaxially disposed, and two oil bearing are mounted in the first bearing chamber (37) and the second bearing chamber (47, respectively) )in.