WO2021258495A1

WO2021258495A1 - Series excited electric motor for improving rotor assembly

Info

Publication number: WO2021258495A1
Application number: PCT/CN2020/105653
Authority: WO
Inventors: 赵冥; 张波; 钟远刚; 刘林; 易恭才; 闫鲲
Original assignee: 东莞市力辉马达有限公司
Priority date: 2020-06-22
Filing date: 2020-07-30
Publication date: 2021-12-30
Also published as: CN112087077A

Abstract

Disclosed is a series excited electric motor for improving a rotor assembly. The series excited electric motor comprises a rotor assembly, wherein the rotor assembly comprises a rotor core (1), a commutator (2), an electric brush mounting plate (3) and an electric motor rear support (4) which are sequentially arranged from top to bottom, a plurality of electric brushes distributed in an axis array manner are mounted on the electric brush mounting plate (3), each electric brush is in friction contact fit with the commutator (2), at least four sets of rotor enameled wires (6) are wound around the rotor core (1), the outer diameter d1 of the rotor core (1) is 40-150 mm, the four sets of rotor enameled wires (6) are each wound around a corresponding winding groove (10), the way in which each rotor enameled wire (6) and the winding groove (10) are wound involves the number of the winding grooves (10) being set to be 16, and the number of cross grooves of the rotor enameled wires (6) being set to be 4; and an insulating member (7) is arranged between the electric brush mounting plate (3) and the electric motor rear support (4). The series excited electric motor improves the mounting structure of the upper part of the commutator (2) and the rotor core (1), and improves the mounting structure of the lower part of the commutator (2) and the electric brush part, thereby reducing the overall height of the rotor assembly to the greatest extent.

Description

A series motor with improved rotor assembly

Technical field

The invention relates to the technical field of series excitation, in particular to a series motor with an improved rotor assembly.

Background technique

The rotor part of the motor is a conversion device used by the series motor to convert electrical energy into electrical energy. The rotor part of the motor mainly includes a rotor core, a commutator and multiple sets of rotor enameled wires. One set of rotor enameled wires corresponds to a pair of magnetic poles in the stator part of the motor.

The stator core of the traditional series motor is 2 poles, and the outer diameter and bottom diameter of the rotor core are made small. The bottom diameter of the rotor core is generally 15-25mm, which corresponds to the number of winding slots of the rotor core Generally 10 slots or 12 slots, that is, the number of spanning slots corresponding to the rotor enameled wire is 5 slots or 6 slots. The winding process is adopted for full pitch winding, that is, the rotor enameled wire almost spans the entire outer diameter of the stator core. The distance between the upper part of the commutator and the iron core of the rotor is long.

Secondly, the existing series-excited motors usually have the brushes embedded in the position of the support legs, but this design is not convenient for the installation of the brush box, or the brushes are installed on two adjacent ones for international safety standards. The distance between the stator enameled wires and the brush box and the rear bracket of the motor is generally at least 3m. Such a brush installation structure makes the commutator unable to be installed under pressure, and the lower part of the commutator is far away from the rear bracket of the motor.

In summary, the height of the rotor assembly formed by the above installation structure is generally above 50mm. The height of the motor of this kind of motor is high, and the finished home appliance will have a large volume, which does not meet the needs of the miniaturization of home appliance motors on the market, so it is necessary Be improved.

Summary of the invention

In view of the shortcomings of the prior art, the purpose of the present invention is to provide a series motor with an improved rotor assembly, improve the installation structure of the upper part of the commutator and the rotor core, and improve the lower part of the commutator and the brush part. The installation structure to maximize the overall height of the rotor assembly.

In order to achieve the above objective, the technical solution adopted by the present invention is: a series motor with an improved rotor assembly, comprising a stator assembly and a rotor assembly. The rotor assembly rotates and cooperates with the stator assembly. The rotor assembly includes rotors arranged sequentially from top to bottom. The iron core, the commutator, the brush mounting plate and the rear bracket of the motor, the rotor iron core and the brush mounting plate are all formed with a shaft hole for the commutator to pass through, and the upper part of the commutator is penetrated through the rotor iron core The lower part of the commutator penetrates the shaft hole of the brush mounting plate. The brush mounting plate is equipped with a plurality of brushes distributed in an axial array. Each brush is in frictional contact with the commutator. The rotor iron The core is wound with at least four sets of rotor enameled wires, the outer edge of the rotor core is provided with multiple winding grooves, and the number of the four sets of rotor enameled wire brushes corresponds to the number of rotor enameled wires;

The outer diameter d1 of the rotor core is 40-150mm, and the four groups of rotor enameled wires are respectively wound in the corresponding winding grooves, and the winding method of each rotor enameled wire and the winding groove is set to any one of the following structures,

1) The number of winding slots is 16, and the number of cross slots of the rotor enameled wire is 4;

2) The number of winding slots is 32, and the number of cross slots of the rotor enameled wire is 8;

3) The number of winding slots is 64, and the number of cross slots of the rotor enameled wire is 16;

Insulators are arranged between the brush mounting plate and the rear bracket of the motor. Each brush includes a brush box installed on the brush mounting plate and brushes embedded in the brush box. The rear bracket of the motor is formed with a brush avoidance Slot, the insulator protrudes to the brush avoidance slot, the lower part of the brush box has riveting pins, the riveting pins extend downward through the brush mounting plate and riveted to the lower end surface of the brush mounting plate, the riveting pins are located in the insulation Above the piece.

In a further technical solution, the distance d4 from the upper end surface of the commutator to the lower end surface of the rotor core is less than or equal to 20 mm.

In a further technical solution, the thickness of the rotor core is 8-20mm, and the bottom diameter of the rotor enameled wire is 40-100mm. At least when each group of the rotor enameled wire is wound on the corresponding winding groove, the rotor enameled wire Located on the outside of the commutator.

In a further technical solution, the outer diameter d3 of the commutator is smaller than the bottom diameter d2 of the rotor core, and each of the rotor enameled wires is wound in the corresponding winding groove in a half-flower basket winding manner.

In a further technical solution, the linear distance d5 in the vertical direction between the brush mounting plate and the rear bracket of the motor is ≤ 2.5 mm.

In a further technical solution, the linear distance d6 between the end of the riveting pin and the rear bracket of the motor in the vertical direction is ≤ 2.0 mm.

In a further technical solution, the linear distance between the rotor core and the motor rear support in the vertical direction is 20-30 mm.

In a further technical solution, the number of the brush boxes is at least four, the intersection of the four brush boxes and the center circle of the brush mounting plate is 90°, and the motor rear bracket corresponds to the position of each brush box The brush avoiding grooves are respectively formed at the positions.

In a further technical solution, the insulating member is an integrally formed ring-shaped insulating sheet, and the insulating sheet is respectively protrudingly formed with brush insulating parts at positions corresponding to the brush avoiding grooves, and each brush insulating part is connected to the brush avoiding grooves. The size and shape of the groove are matched;

The brush mounting plate is provided with riveting holes at the position corresponding to each brush box. The brush box has a brush mounting cavity, the upper end of the brush box has a conductive connection part, and the upper part of the brush box has a baffle part. At least after the brush is installed in the brush installation cavity of the brush box, the baffle portion is bent inward and the conductive connection portion is bent downward to close the rear end of the brush installation cavity.

In a further technical solution, the transverse cross-section of the riveting hole is in the shape of an arch, and the riveting hole includes a riveting plug section that fits the riveting pin and an arch arc section formed by the riveting plug section extending inwardly. Two opposite ends of the arc section respectively form a boss with the plug-in section, and the arc sections of a pair of riveting holes corresponding to the two riveting pins are arranged opposite to each other;

The length of the riveting pin is half of the width of the brush installation cavity. At least after the brush is installed in the brush installation cavity of the brush box, the two riveting pins abut against each other.

After adopting the above structure, the advantages of the present invention compared with the prior art are:

1. The present invention reduces the thickness of the rotor core by increasing the outer diameter of the rotor core. At the same time, as the outer diameter of the rotor core increases, the total number of winding slots of the rotor core can be increased, and the cross slot of the rotor enameled wire can be increased. The number is reduced relative to the total number of winding slots, so that the bottom diameter of the rotor enameled wire becomes smaller, that is, the rotor enameled wire gradually moves outwards of the rotor core, at least when each group of the rotor enameled wire is wound on the corresponding winding slot. , The rotor enameled wire is located outside the shaft hole of the rotor core, and the upper part of the commutator can be pressed down to be closer to the rotor core, so as to reduce the height of the entire rotor assembly.

2. The present invention changes the traditional brush installation structure to leave an installation space for the commutator, so that the lower part of the commutator is closer to the brush installation board. Specifically, an insulating member is arranged between the brush mounting plate and the rear bracket of the motor to solve the safety requirements, so that the brush box can be installed under pressure, thereby leaving sufficient installation space for the lower part of the commutator to maximize Reduce the height of the entire rotor assembly.

Description of the drawings

The present invention will be further described below in conjunction with the drawings and embodiments.

Figure 1 is a schematic diagram of the structure of the present invention;

Figure 2 is a schematic diagram of the assembly of the commutator and the rotor core of the present invention;

3 is a schematic diagram of the assembly of the commutator, the brush mounting plate, and the rear bracket of the motor according to the present invention;

Figure 4 is a side view of the commutator and the rotor core in the prior art after being assembled;

Figure 5 is a side view of the commutator of the present invention and the rotor core after being assembled;

Fig. 6 is a schematic diagram of a winding structure of a rotor enameled wire and a winding groove in the prior art;

7 is a schematic diagram of the winding structure of the rotor enameled wire and the winding groove of the present invention;

Figure 8 is a schematic diagram of the assembly of a brush box and a brush mounting plate in the prior art;

9 is a schematic diagram of the assembly of the brush box, the brush mounting plate, and the rear bracket of the motor according to the present invention;

Fig. 10 is an enlarged schematic diagram of the structure at A in Fig. 9;

11 is a schematic diagram of the exploded structure of the brush box, the brush mounting plate, and the rear bracket of the motor according to the present invention;

Figure 12 is a front view of the brush box, brush mounting plate, and motor rear bracket of the present invention;

Figure 13 is a schematic diagram of the structure of a brush box in the prior art;

Figure 14 is a schematic view of the structure of the brush box of the present invention;

Figure 15 is a schematic diagram of the riveting of a brush box and a brush mounting plate in the prior art;

Figure 16 is a schematic diagram of the riveting of the brush box and the brush mounting plate of the present invention;

Figure 17 is a schematic structural view of the brush mounting plate of the present invention;

[Correct 12.11.2020 according to Rule 26]

detailed description

The following are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby.

[Correct 12.11.2020 according to Rule 26]
As shown in Figures 1 to 17, the present invention provides a series motor with an improved rotor assembly, which includes a stator assembly and a rotor assembly. The rotor assembly rotates and cooperates with the stator assembly. The rotor core 1, the commutator 2, the brush mounting plate 3 and the rear bracket 4 of the motor, the rotor core 1 and the brush mounting plate 3 are formed with a shaft hole for the commutator 2 to pass through. The upper part of the commutator 2 is penetrated through the shaft hole of the rotor core 1, and the lower part of the commutator 2 is penetrated through the shaft hole of the brush mounting plate 3. The brush mounting plate 3 is equipped with a plurality of brushes distributed in an axial array. Each brush is in frictional contact with the commutator 2. At least four sets of rotor enameled wires 6 are wound around the rotor core 1, and the outer edge of the rotor core 1 is provided with a plurality of winding

slots

10, 6 and the number of brushes is the same as that of the rotor. The number of enameled wires 6 corresponds to that.

The installation structure of the upper part of the commutator 2: where, as shown in Figure 7, the outer diameter d1 of the rotor core 1 is 40-150mm, the thickness of the rotor core 1 is 8-20mm, and the bottom diameter of the rotor enameled wire 6 is 40-100mm, the distance d4 from the upper end surface of the commutator 2 to the lower end surface of the rotor core 1 ≤ 20 mm. The four groups of rotor enameled wires 6 are respectively wound in the corresponding winding grooves 10, and the winding mode of each rotor enameled wire 6 and the winding groove 10 is set as the number of winding grooves 10 is 16, and the number of cross grooves of the rotor enameled wire 6 is 4 Piece.

The present invention reduces the thickness of the rotor core 1 by increasing the outer diameter of the rotor core 1. At the same time, as the outer diameter of the rotor core 1 increases, the total number of winding slots 10 of the rotor core 1 can be increased, and the rotor enameled wire The number of crossing slots 6 is reduced relative to the total number of winding slots 10, so that the bottom diameter of the rotor enameled wire 6 becomes smaller, that is, the rotor enameled wire 6 gradually moves outwards of the rotor core 1, at least in each group of the rotor enameled wire 6 respectively When set on the corresponding winding groove 10, the rotor enameled wire 6 is located outside the shaft hole of the rotor core 1, and the upper part of the commutator 2 can be pressed down closer to the rotor core 1 to reduce the height of the entire rotor assembly , Realize the demand of miniaturization of the whole machine of home appliance motor.

In a preferred embodiment, the outer diameter d3 of the commutator 2 is smaller than the bottom diameter d2 of the rotor core 1, which further enables the commutator 2 to be closer to the rotor core 1. Each of the rotor enameled wires 6 is respectively wound in the corresponding winding groove 10 in a half-flower basket winding manner.

In other embodiments, the winding mode of each rotor enameled wire 3 and the winding groove 10 is set to the following structure can also be set as the number of winding grooves 10 is 32, the number of cross grooves of the rotor enameled wire 3 is 8, and the winding The number of slots 10 is 64, and the number of spanning slots of the rotor enameled wire 3 is 16. In order to clearly explain the principle of the present invention, the following embodiments all take the number of winding grooves 10 as 16 and the number of spanning grooves of the rotor enameled wire 3 as 4 as a reference standard, which will not be repeated here.

Installation structure of the lower part of the commutator 2: In practical applications, in order to meet the needs of miniaturization of terminal home appliances and reduce the overall height of the series-excited motor, the present invention changes the traditional brush installation structure to leave the commutator 2 empty The installation space makes the lower part of the commutator 2 closer to the brush installation plate 3.

Specifically, an insulating member 7 is provided between the brush mounting plate 3 and the motor rear bracket 4, and each brush includes a brush box 5 installed on the brush mounting plate 3 and a brush embedded in the brush box 5. , The rear bracket 4 of the motor is formed with a brush avoiding groove 40, the insulating member 7 protrudes to the brush avoiding groove 40, the lower part of the brush box 5 has a riveting pin 50, and the riveting pin 50 extends downward through the brush mounting plate 3 and riveted to the lower end surface of the brush mounting plate 3, and the riveting pin 50 is located above the insulating member 7.

In actual application, the present invention passes the brush box 5 through the brush mounting plate 3 and riveted to the lower end surface of the brush mounting plate 3, thereby reducing the overall height of the brush mounting structure to reduce the overall height of the series motor Purpose, and isolate the brush box 5 from the motor rear bracket 4 by an insulating member 7, so as to meet safety requirements. Specifically, the brush mounting plate 3 and the motor rear bracket 4 have a linear distance d1 in the vertical direction. ≤2.5mm, after the brush box 5 is riveted, the straight-line distance d2 between the end of the riveting pin 50 and the rear frame 4 of the motor in the vertical direction is ≤2.0mm.

In a more specific embodiment, the number of the brush boxes 5 is at least four, and the intersection of the four brush boxes 5 and the center point of the brush mounting plate 3 is 90°, and the motor rear bracket 4 The brush avoiding grooves 40 are respectively formed at positions corresponding to the brush boxes 5, and the stator enameled wire avoiding grooves are provided at the positions of the motor rear bracket 4 adjacent to the brush avoiding grooves 40. In practical applications, the lower part of the stator enameled wire is accommodated in the stator enameled wire avoidance groove. Compared with the prior art, the position of the brush is installed in the middle of the adjacent stator enameled wire, the structure is more compact, and the brush mounting plate 3 is reduced. And the inner diameter of the motor rear bracket 4, that is, the inner diameter of the corresponding motor rotor assembly is smaller, which further makes the whole motor more compact and highly practical.

In a further technical solution, the insulating member 7 is an integrally formed ring-shaped insulating sheet, and the insulating sheet corresponding to the position of each brush avoiding groove 40 is respectively protrudingly formed with a brush insulating portion 70, and each brush insulating portion 70 Compatible with the size and shape of the brush avoidance groove 40, the insulating sheet is formed with a number of button holes, and the insulating sheet is buckled on the upper side of the rear bracket 4 of the motor through the button holes, making the overall brush installation structure more compact and reducing electricity The height of the brush mounting structure.

The brush mounting plate 3 is provided with a riveting hole 30 at the position corresponding to each brush box 5. The brush box 5 has a brush mounting cavity 53, the upper end of the brush box 5 has a conductive connection part 51, and the brush box 5 There is a baffle part 52 on the upper part of the, at least after the brush is installed in the brush installation cavity 53 of the brush box 5, the baffle part 52 is bent inward and the conductive connection part 51 is bent downward to close the brush installation cavity 53's back end.

In a further technical solution, the transverse cross-section of the riveting hole 30 is in the shape of an arch, and the riveting hole 30 includes a riveting plug section 300 that is adapted to the riveting pin 50 and a shape formed by the riveting plug section 300 extending inwardly. Arch arc segment 301, two opposite ends of the arch arc segment 301 respectively form a boss 302 between the plug-in segment, and the arch arc segments 301 of a pair of riveting holes 30 corresponding to the two riveting pins 50 are opposite to each other. Orientation setting, the length of the riveting pin 50 is half of the width of the brush mounting cavity 53, at least after the brush is installed in the brush mounting cavity 53 of the brush box 5, the riveting pin 50 is actually used to insert the riveting plug section 300 , The upper part of the brush box 5 is clamped on the boss 302, and the two riveting pins 50 abut against each other, so that the width of the lower part of the brush box 5 and the upper part of the brush box 5 are always even, which solves the problem of The large gap between the brush box 5 reduces the working noise significantly. During the installation process, the insertion depth of the two left and right riveting pins 50 is always the same. Secondly, it is preferable that the arch segments 301 of a pair of riveting holes 10 corresponding to the two riveting pins 50 are arranged opposite to each other, such as 3 and 6, compared to the structure in which the arc segment 301 is arranged outwards and the plug-in segment is arranged inward in the prior art, the riveting gap of the brush mounting plate 3 of the present invention is large.

Preferably, after the upper and lower parts of the commutator 2 are respectively installed, the linear distance between the rotor core 1 and the motor rear support 4 in the vertical direction is 20-30mm, that is, the height of the rotor assembly of the series motor is 20-30mm, greatly reducing the installed height of the complete motor.

The above content is only the preferred embodiments of the present invention. For those of ordinary skill in the art, according to the ideas of the present invention, there will be changes in the specific implementation and the scope of application. limits.

Claims

A series motor with an improved rotor assembly includes a stator assembly and a rotor assembly. The rotor assembly rotates and cooperates with the stator assembly. The rotor assembly is characterized in that the rotor assembly includes a rotor core (1) and a commutator ( 2) The brush mounting plate (3) and the motor rear bracket (4), the rotor core (1) and the brush mounting plate (3) are all formed with a shaft hole for the commutator (2) to pass through. The upper part of the commutator (2) is pierced through the shaft hole of the rotor core (1), and the lower part of the commutator (2) is pierced through the shaft hole of the brush mounting plate (3). The brush mounting plate (3) ) A plurality of brushes distributed in an axial array are installed, and each brush is in frictional contact with the commutator (2). The rotor core (1) is wound with at least four sets of rotor enameled wires (6), and the rotor core (1) A number of winding grooves (10) are opened on the outer edge of ), and the number of brushes corresponds to the number of rotor enameled wires (6);

The outer diameter d1 of the rotor core (1) is 40-150mm, and the four groups of rotor enameled wires (6) are respectively wound in the corresponding winding grooves (10), and each rotor enameled wire (6) and the winding groove (10) are wound The line mode is set to any one of the following structures,

1) The number of winding grooves (10) is 16, and the number of spanning grooves of the rotor enameled wire (6) is 4;

2) The number of winding grooves (10) is 32, and the number of spanning grooves of the rotor enameled wire (6) is 8;

3) The number of winding grooves (10) is 64, and the number of spanning grooves of the rotor enameled wire (6) is 16;

An insulating member (7) is arranged between the brush mounting plate (3) and the rear bracket (4) of the motor. Each brush includes a brush box (5) mounted on the brush mounting plate (3) and a brush box (5) embedded in the brush mounting plate (3). For the brushes in the brush box (5), the rear bracket (4) of the motor is formed with a brush avoidance groove (40), and the insulating member (7) protrudes to the brush avoidance groove (40) and the lower part of the brush box (5) It has a riveting pin (50), the riveting pin (50) extends downward through the brush mounting plate (3) and is riveted to the lower end surface of the brush mounting plate (3), and the riveting pin (50) is located on the insulator ( 7) Above.
The series motor with an improved rotor assembly according to claim 1, characterized in that: the distance d4 from the lower end surface of the commutator (2) to the end surface of the rotor core (1) is ≤ 20 mm.
The series motor with an improved rotor assembly according to claim 1, characterized in that the thickness of the rotor core (1) is 8-20mm, and the bottom diameter of the rotor enameled wire (6) is 40-100mm, at least When the rotor enameled wires (6) of each group are respectively wound on the corresponding winding grooves (10), the rotor enameled wires (6) are located outside the commutator (2).
The series motor with an improved rotor assembly according to claim 1, characterized in that: the outer diameter d3 of the commutator (2) is smaller than the bottom diameter d2 of the rotor core (1), and each of the The rotor enameled wires (6) are respectively wound in the corresponding winding grooves (10) in a half-flower basket winding manner.
The series motor with an improved rotor assembly according to claim 1, characterized in that the linear distance d5 in the vertical direction between the brush mounting plate (3) and the motor rear bracket (4) is ≤ 2.5 mm.
The series motor with an improved rotor assembly according to claim 1, wherein the linear distance between the end of the riveting pin (50) and the motor rear bracket (4) in the vertical direction is d6≤2.0mm .
The series motor with an improved rotor assembly according to claim 1, wherein the linear distance between the rotor core (1) and the motor rear support (4) in the vertical direction is 20-30 mm.
The series motor with an improved rotor assembly according to claim 1, wherein the number of the brush boxes (5) is at least four, and the four brush boxes (5) and the brush mounting plate ( The intersection of the center points of 3) is 90°, and the brush avoiding grooves (40) are respectively formed at the positions of the motor rear bracket (4) corresponding to the respective brush boxes (5).
The series motor with an improved rotor assembly according to claim 1, characterized in that: the insulating member (7) is an integrally formed ring-shaped insulating sheet, and the insulating sheet corresponds to each brush avoidance groove (40). A brush insulation part (70) is protrudingly formed at the position, and each brush insulation part (70) is adapted to the size and shape of the brush avoidance groove (40);

The brush mounting plate (3) is provided with riveting holes (30) at positions corresponding to each brush box (5). The brush box (5) has a brush mounting cavity (53), and the upper end of the brush box (5) The part has a conductive connection part (51), the upper part of the brush box (5) has a baffle part (52), at least after the brush is installed in the brush installation cavity (53) of the brush box (5), it blocks The plate portion (52) is bent inward and the conductive connecting portion (51) is bent downward to close the rear end of the brush installation cavity (53).
The series motor with an improved rotor assembly according to claim 9, characterized in that: the transverse cross section of the riveting hole (30) is in the shape of an arch bridge, and the riveting hole (30) includes a rivet pin (50) compatible The matching riveting plug section (300) and the arch arc section (301) formed by the riveting plug section (300) extending inwardly and arching, the two opposite ends of the arch arc section (301) are respectively connected to the plugging section A boss (302) is formed therebetween, and the arch segments (301) of a pair of riveting holes (30) corresponding to the two riveting pins (50) are arranged in opposite directions;

The length of the riveting pin (50) is half of the width of the brush mounting cavity (53). At least after the brush is installed in the brush mounting cavity (53) of the brush box (5), the two riveting pins ( 50) Compete against each other.