阅读说明：本技术 端盖组件以及具有该端盖组件的电机 (End cover assembly and motor with same ) 是由 张宏伟 韩霞 胡渤 于 2020-06-10 设计创作，主要内容包括：本发明涉及电动驱动领域,提供了一种端盖组件以及具有该端盖组件的电机,所述端盖组件包括盖体、收容于所述盖体内的端盖,所述端盖包括绝缘基座、布置在所述绝缘基座中的轴承和邻近所述轴承的电刷组件,所述盖体由导电材料制成,所述端盖组件还包括布置在所述盖体内的导电件,所述导电件位于所述轴承背离所述电刷组件的一侧,所述轴承依次电连接所述导电件和所述盖体以实现接地为改善所述电刷组件产生的电磁干扰。本发明实施例提供的端盖组件,具有有效的接地结构,能够有效地减小电机的电磁干扰。(The invention relates to the field of electric drive, and provides an end cover assembly and a motor with the end cover assembly, wherein the end cover assembly comprises a cover body and an end cover accommodated in the cover body, the end cover comprises an insulating base, a bearing arranged in the insulating base and a brush assembly adjacent to the bearing, the cover body is made of a conductive material, the end cover assembly also comprises a conductive piece arranged in the cover body, the conductive piece is positioned on one side of the bearing, which is far away from the brush assembly, and the bearing is sequentially electrically connected with the conductive piece and the cover body so as to realize grounding and improve the electromagnetic interference generated by the brush assembly. The end cover assembly provided by the embodiment of the invention has an effective grounding structure and can effectively reduce the electromagnetic interference of the motor.)

1. An end cover assembly comprises a cover body (10) and an end cover (11) accommodated in the cover body (10), wherein the end cover comprises an insulating base (110), a bearing (113) arranged on the insulating base (110) and a brush assembly (112) adjacent to the bearing (113), the end cover assembly is characterized in that the cover body (10) is made of a conductive material, the end cover assembly further comprises a conductive piece (13) arranged in the cover body (10), the conductive piece (13) is positioned on one side of the bearing (113) departing from the brush assembly (112), and the bearing (113) is sequentially electrically connected with the conductive piece (13) and the cover body (10) so as to realize grounding and improve electromagnetic interference generated by the brush assembly (112).

2. End cap assembly according to claim 1, characterized in that the electrically conductive member (13) is fixed at an axial end face of the insulating base (110) facing the cover body (10).

3. The end cap assembly of claim 2, wherein the conductive member (13) comprises a body (131) extending substantially along an axial end face of the insulating base (110) and a plurality of first catches (132) extending from the body (131) toward the insulating base (110), the plurality of first catches (132) being caught on the insulating base (110) and abutting between the cover (10) and the insulating base (110).

4. The end cap assembly according to claim 3, wherein each of the plurality of first catches (132) has an outward protrusion (321) protruding radially outward along the insulating base (110) at an axial middle portion thereof, the outward protrusion (321) abutting against the cap body (10).

5. End cap assembly according to claim 3, characterized in that the electrically conductive member (13) comprises an abutment tab (134) abutting against the bearing (113), the abutment tab (134) extending from the body (131) towards the bearing (113) and resiliently abutting.

6. An end cap assembly according to claim 5, wherein the insulating base (110) comprises a mounting hole (130) for receiving the bearing (113), the mounting hole (130) is provided at an axially outer end thereof with a non-closed U-shaped or C-shaped stopper (72), an opening (73) is formed at a radial side of the stopper (72), and the abutting piece (134) elastically abuts against the bearing (113) through the opening (73).

7. An end cap assembly according to claim 5, wherein the tip (341) of the abutment tab (134) extends curvedly away from the bearing (113).

8. An end cap assembly according to claim 7, wherein a substantially central position of the tip (341) is provided as an abutment (342) protruding towards the bearing (113), the abutment (342) extending towards a tip end of the abutment tab (134).

9. The end cap assembly of claim 3, comprising a circuit board (12) mounted between the cover (10) and the conductive member (13) and conductively connected to the conductive member (13), wherein the conductive member (13) comprises a plurality of second catches (133) extending from the body (131) away from the insulating base (110), and wherein the plurality of second catches (133) grip both sides of the circuit board (12).

10. An electric machine comprising a stator (2), a rotor (4) rotatably housed in the stator (2), and an end cap assembly covering the stator (2), a shaft (41) being housed in a bearing (113), characterized in that the end cap assembly is according to any one of claims 1 to 9.

Technical Field

The invention relates to the field of electric drive, in particular to an end cover assembly and a motor with the same.

Background

The motor is a device for converting electric energy into mechanical energy by utilizing the principle of electromagnetic induction. When the armature winding device enters another branch from a certain branch, the current and the electromotive force in the circuit change directions, and the change of the current direction in the winding is completed by a mechanical device consisting of a commutator and an electric brush. The contact surface of the commutator and the carbon brush is an alternating point with sudden change of current, the electric spark is generated on the electric brush under bad commutation conditions, the electromagnetic interference caused by the discharge of the electric spark generates conduction reflection and radiation emission, and particularly, the interference is large at high frequency, and the motor is generally required to be grounded. However, the conventional brush motor usually has a grounding structure which is not only easy to fall off, but also brings other negative effects, and the electromagnetic interference of the motor cannot be effectively improved.

Disclosure of Invention

In view of the above, the present invention aims to provide an end cover assembly, and a motor having the same, which can solve or at least reduce the above problems.

The end cover assembly comprises an insulating base, a bearing arranged in the insulating base, a brush assembly adjacent to the bearing, a conductive piece arranged in the cover body, wherein the conductive piece is positioned on one side of the bearing, which is far away from the brush assembly, and the bearing is sequentially electrically connected with the conductive piece and the cover body to realize grounding so as to improve the electromagnetic interference generated by the brush assembly.

In some embodiments, the conductive member is fixed at an axial end face of the insulating base facing the cover body.

In some embodiments, the conductive member includes a body extending substantially along an axial end surface of the insulating base, and a plurality of first catches extending from the body toward the insulating base, the plurality of first catches being caught on the insulating base and abutting between the cover and the insulating base.

In some embodiments, each of the plurality of first catches has, at an axially middle portion thereof, an outer protrusion protruding radially outward along the insulating base, the outer protrusion abutting against the cover.

In some embodiments, the conductive member includes an abutting piece abutting against the bearing, the abutting piece extending from the body toward the bearing and elastically abutting.

In some embodiments, the insulating base includes a mounting hole for receiving the bearing, an axially outer end of the mounting hole is provided with a non-closed U-shaped or C-shaped stop portion, a radial side of the stop portion forms an opening, and the abutting piece elastically abuts against the bearing through the opening.

In some embodiments, the distal end of the abutment tab extends curvedly away from the bearing.

In some embodiments, a substantially middle position of the tip is provided as an abutment projecting toward the bearing, the abutment extending toward a tip end of the abutment piece.

In some embodiments, the end cap assembly includes a circuit board mounted between the cover body and the conductive member and conductively connected to the conductive member, and the conductive member includes a plurality of second clips extending from the body away from the insulating base, and the plurality of second clips are clamped on two sides of the circuit board.

The invention also provides a motor, which comprises a stator, a rotor which is rotatably accommodated in the stator, and an end cover assembly which is covered on the stator, wherein a rotating shaft is sleeved in a bearing, and the end cover assembly is the end cover assembly.

The end cover assembly provided by the embodiment of the invention has an effective grounding structure and can effectively reduce the electromagnetic interference of the motor.

Drawings

Fig. 1 shows a perspective assembly view of a motor according to an embodiment of the present invention.

Fig. 2 shows an axial cross-section of the electrical machine shown in fig. 1.

Fig. 3a shows an exploded view of the electrical machine shown in fig. 1.

Fig. 3b shows an exploded view of the motor shown in fig. 3a in another orientation.

Fig. 4 shows an exploded view of the end cap of the electric machine shown in fig. 1.

Fig. 5 shows an axial perspective cross-sectional view of the insulating base of the end cap shown in fig. 4 with an electrically conductive member mounted thereon.

Fig. 6 is a perspective view illustrating a conductive member of the end cap shown in fig. 4.

Reference numerals: 100-a motor; 1-an end cap assembly; 10-a cover body; 101-a first step; 102-a notch; 11-end cap; 110-an insulating base; 103-a bump; 104-a card table; 105-a connection station; 106-port; 107-a substrate; 71-a mounting groove; 72-a stop; 73-opening; 74-first mounting cavity; 75-a second mounting cavity; 108-a side wall; 112-a brush assembly; 123-terminal; 113-a first bearing; 130-mounting holes; 12-a circuit board; 120-an electronic component; 121-capacitance; 122-an inductance; 13-a conductive member; 131-a body; 132-a first catch; 321-an outer convex part; 133-a second catch; 331-a bevel; 134-a contact piece; 341-end; 342-an abutment; 135-a connection end; 136-a via; 2-a stator; 20-a housing; 21-a notch; 22-hook; 23-a second step; 24-a second bearing; 25-closed end; 3-a magnet; 4-a rotor; 41-a rotating shaft; 42-a commutator; 43-armature.

Detailed Description

The invention will be described in detail with reference to the accompanying drawings and specific embodiments, so that the technical scheme and the beneficial effects of the invention are more clear. It is to be understood that the drawings are provided for purposes of illustration and description only and are not intended as a definition of the limits of the invention, but are drawn to scale.

Fig. 1 to 3b show a motor 100 according to an embodiment of the present invention, in which the motor 100 includes a stator 2, a rotor 4 rotatably housed in the stator 2, and an end cover assembly 1 covering an opening end of the stator 2. The stator 2 includes a housing 20 and a magnet 3 disposed within the housing 20. The housing 20 is substantially cylindrical with one end open. The end cap assembly 1 is mounted to the open end of the housing 20. The end cover assembly 1 and the stator 2 enclose a containing space, and the rotor 4 is contained in the containing space and can rotate relative to the end cover assembly 1 and the stator 2. The rotor 4 includes a rotating shaft 41, and a commutator 42 and an armature 43 that are fixed to the rotating shaft 41. The commutator 42 is disposed adjacent to the end cover assembly 1.

The end cap assembly 1 includes a cap body 10, an end cap 11 received in the cap body 10, a circuit board 12 mounted on the end cap 11, and a conductive member 13. The lid 10 is substantially cylindrical with one end open. The end cap 11 is accommodated in the cover body, and defines an accommodating space with the closed end of the cover body 10, in which the circuit board 12 and the conductive member 13 are accommodated. In the present embodiment, the conductive member 13 is disposed between the end cap 11 and the circuit board 12. Preferably, the circuit board 12 is fixed to the end cap 11 by a conductive member 13.

Referring also to fig. 4, the end cap 11 includes an insulating base 110, a brush assembly 112 mounted on the insulating base 110, and a first bearing 113. The rotating shaft 41 made of metal is supported and constrained by a first bearing 113. The insulating base 110 is fixed at the open end of the housing 20 and is snap-fitted to the housing 20, and the insulating base 110 and the cover 10 are also snap-fitted to assemble the cover 10 and the housing 20 together. In other words, the end cover 11 is fixed to the open end of the housing 20 of the stator 2, and the lid body 10 is covered on the outer periphery of the end cover 11.

Specifically, the open end of the metal shell 20 is provided with a notch 21 that opens in the axial direction of the shell 20. The insulating base 110 includes a substrate 107 and a sidewall 108 disposed around the substrate 107. An outer peripheral side of the sidewall 108 of the insulating base 110 is provided with a projection 103 extending radially outward therefrom. The projection 103 is engageable in the notch 21 to block circumferential movement of the insulating base 110 relative to the housing 20. The housing 20 is also provided at its open end with a hook 22 projecting inward in the radial direction thereof. Accordingly, the outer peripheral side of the sidewall 108 of the insulating base 110 is provided with the locking boss 104 extending outward in the radial direction thereof. The hooks 22 can overlap the catches 104 to block the insulating base 110 from moving axially relative to the housing 20. The above configuration enables the mounting of the insulating base 110 on the housing 20, thereby mounting the end cap assembly 1 on the housing 20. The cover 10 is fixed to the insulating base 110 by interference fit. Further, two connection stages 105 extending outward in the radial direction thereof are also arranged on the outer peripheral side of the side wall 108 of the insulating base 110. Accordingly, the cover body 10 is arranged with two notches 102 at its open end. The two notches 102 engage the two connecting lands 105, respectively, to prevent circumferential movement of the cover 10 relative to the insulating base 110. Two connecting portions 105 protrude from the corresponding recesses 102 in a radial direction of the insulating base 110. In this embodiment, each connecting platform 105 is provided with a through opening 106 for receiving a wire connected to an external power source.

The side wall 108 of the insulating base 110 is substantially cylindrical, and the base plate 107 is disposed substantially at the axial center of the side wall 108, and partitions an inner cavity surrounded by the side wall 108 into the first mounting cavity 74 and the second mounting cavity 75. The first mounting chamber 74 is disposed toward the commutator 42 of the rotor 4, and the second mounting chamber 75 is disposed away from the commutator 42 of the rotor 4. The base plate 107 has a mounting hole 130 formed in the center thereof for receiving the first bearing 113. The brush assembly 112 is secured within the first mounting cavity 74 of the insulating base 110. The circuit board 12 and the conductive member 13 are mounted on the second mounting cavity 75 side of the insulating base 110. In the present embodiment, the conductive member 13 is fixed to the insulating base 110 and is in conductive contact with the first bearing 113 at the base plate 107, and the circuit board 12 is fixed to the axially outer side of the insulating base 110 through the conductive member 13. The electrical connection terminals 123 of the brush assembly 112 are electrically connected to the circuit board 12 through the base plate 107 (and the conductive members 13) of the insulating base 110.

The commutator 42 of the rotor 4 is located in the first mounting cavity 74 of the insulating base 110, and the brush assembly 112 is disposed around the commutator 42. The rotating shaft 41 of the rotor 4 is rotatably supported at one end thereof on the head assembly 1 by a first bearing 113 and at the other end thereof on the housing 20 by a second bearing 24 provided at the closed end 25 of the housing 20 of the stator 2. Preferably, the first bearing 113 and the second bearing 24 are both sliding bearings.

In this embodiment, the case 20 and the cover 10 are made of conductive metal materials. The cover 10 is preferably made of steel. Optionally, the housing 20 and the cover 10 may also be provided with a conductive coating. The conductive member 13 is made of a conductive material. The first bearing 113 disposed at the end cap 11 of the end cap assembly 1 is electrically connected to the cover 10 via the conductive member 13 for grounding. Both ends of the motor 100 are grounded by the bearings 113 and 24 for supporting the rotating shaft 41.

Referring to fig. 4 to 6, in the present embodiment, the conductive member 13 is clamped and fixed on the insulating base 110. Specifically, the conductive member 13 includes a substantially sheet-shaped body 131, and a plurality of first catches 132 extending from the body 131 toward the insulating base 110. The first clamping portions 132 are respectively located at two opposite sides of the body 131, and respectively clamped at the outer sides of two opposite sides of the sidewall 108 of the insulating base 110 to clamp the conductive member 13 on the insulating base 110. After the cover 10 and the end cap 11 of the end cap assembly 1 are assembled, the first clamping portion 132 abuts between the cover 10 and the insulating base 110, so that the conductive member 13 is grounded, and other components electrically connected with the conductive member 13 are grounded.

Preferably, axial end surfaces of the opposite sides of the side wall 108 are recessed to form a mounting groove 71, respectively. The body 131 of the conductive member 13 is received in the corresponding mounting groove 71 to enhance the positioning effect of the conductive member 13. In this embodiment, the mounting slot 71 is correspondingly arranged above the side wall 108 between the two connecting platforms 105 (see fig. 3 a).

Preferably, the plurality of first catches 132 includes two first catches 132 respectively located at opposite sides of the body 131. Each of the first catches 132 has an outer protrusion 321 at an axially middle portion thereof that protrudes radially outward along the insulating base 110. After the cover 10 and the end cover 11 of the end cover assembly 1 are assembled, the first clamping portion 132 elastically abuts against the cover 10 via the convex portion 321, so that the conductive member 13 is more reliably grounded.

The conductive member 13 further includes an abutting piece 134 for elastically contacting the first bearing 113. Preferably, a stop portion 72 is disposed at a substantially middle position of the base plate 107 of the insulating base 110, and is used for axially limiting the first bearing 113. In this embodiment, the blocking portion 72 is configured to be a non-closed U-shape or C-shape and surrounds the mounting hole 130 for receiving the first bearing 113, and an opening 73 is formed at one side of the blocking portion 72 in the radial direction. In order to prevent the rotating shaft 41 from driving the first bearing 113 to move in the axial direction when in the operating state, the abutting piece 134 elastically abuts against the first bearing 113 through the opening 73 so as to realize the grounding of the first bearing 113 through the conductive piece 13, and the possible moving gap or installation gap is also eliminated.

In this embodiment, the abutting piece 134 extends from the body 131 of the conductive member 13 toward the first bearing 113 at an inclined angle. After the conductive member 13 is mounted on the insulating base 110 with the first bearing 113, the abutting piece 134 is elastically pressed against an axial end face of the first bearing 113. In the present embodiment, the tip 341 of the abutting piece 134 is bent upward, thereby preventing the tip 341 of the abutting piece 134 from damaging the first bearing 113 due to vibration or the like during the operation of the motor 100. Preferably, a substantially middle position of the tip 341 of the abutting piece 134 is provided as an abutting portion 342 protruding toward the first bearing 113, the abutting portion 342 extending toward the tip end of the abutting piece 134. The abutment 342 is provided in a circular arc shape, so that reliable electrical connection of the abutment piece 134 to the first bearing 113 can be achieved while reducing the contact area of the abutment piece 134 to the first bearing 113. In the present embodiment, the abutting piece 134 abuts against the first bearing 113 through the opening 73, so that the first bearing 113 is electrically connected to the rotating shaft 41 and grounded, i.e., the electromagnetic interference generated by the brush assembly 112 (i.e., the vibration source), especially the high frequency part, and the electrical signal thereof is electrically connected to the conductive member 13 and the metal cover 10 and grounded through the shortest path, i.e., the first bearing 113, so that the internal circulation inside the motor 100 is realized, and the metal housing 20 has good electromagnetic interference resistance and vibration resistance.

In addition, the conductive member 13 further includes a plurality of second catches 133 and a connecting end 135 extending from the body 131 away from the insulating base 110. Preferably, the plurality of second catches 133 includes at least two second catches 133. The plurality of second catches 133 are held on both sides of the circuit board 12. In this embodiment, the top of the second catch 133 is provided with an inclined surface 331 inclined outward, so as to clamp the circuit board 12 on the conductive member 13 through the second catch 133. In this embodiment, the plurality of second catches 133 includes four. The number of the second catches 133 and the first catches 132 may be set according to actual needs.

The connection terminal 135 is electrically connected to the circuit board 12 to realize grounding of the circuit board 12. In the present embodiment, a plurality of electronic components 120, such as a plurality of inductors 122 and a plurality of capacitors 121, are disposed on the circuit board 12. The plurality of inductors 122 and the plurality of capacitors 121 are arranged on both sides of the circuit board 12 in the axial direction of the insulating base 110. In the present embodiment, the plurality of capacitors 121 are disposed on a side of the circuit board 12 facing away from the conductive member 13, the plurality of inductors 122 are disposed on a side of the circuit board 12 close to the conductive member 13, and the plurality of inductors 122 are disposed on both sides of the body 131 of the conductive member 13 and are accommodated in the second mounting cavity 75 of the insulating base 110. In an alternative embodiment, a filter element may also be provided on the circuit board 12 to more effectively suppress electromagnetic interference. In addition, a plurality of through holes 136 are formed in the body 131 of the conductive member 13 so that the rotating shaft 41 and the terminal 123 of the brush assembly 112 can pass through the conductive member 13.

In this embodiment, the conductive member 13 is a single member. The conductive member 13 may be cut and bent from a one-piece metal member. Alternatively, the respective catches 132, 133 and the connecting end 135 on the conductive member 13, and the abutting piece 134 may also be assembled on the body 131 of the conductive member 13.

The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-listed embodiments, and any simple changes or equivalent substitutions of technical solutions that can be obviously obtained by those skilled in the art within the technical scope of the present invention are within the protection scope of the present invention.