CN209844775U - Grounding device for eliminating motor shaft current - Google Patents
Grounding device for eliminating motor shaft current Download PDFInfo
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- CN209844775U CN209844775U CN201920873229.4U CN201920873229U CN209844775U CN 209844775 U CN209844775 U CN 209844775U CN 201920873229 U CN201920873229 U CN 201920873229U CN 209844775 U CN209844775 U CN 209844775U
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- brush holder
- carbon brush
- graphite
- chamber
- bearing assembly
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Abstract
The utility model relates to a grounding device for eliminating the current of a motor shaft, which comprises a bearing assembly and a rotating shaft penetrating through the bearing assembly, wherein a carbon brush device is arranged between the outer side wall of the bearing assembly and the rotating shaft; the carbon brush device comprises a brush holder mounting plate mounted on the outer side wall of the bearing assembly, a carbon brush holder is mounted at the end part of the brush holder mounting plate through a fixing plate, graphite penetrates through the carbon brush holder, a compression spring is mounted on the carbon brush holder located at the tail part of the graphite, the head part of the graphite extends out of the carbon brush holder and is always pressed and attached to a rotating shaft under the action of the compression spring, and the carbon brush device further comprises a lead connected between the graphite and the brush holder mounting plate. The utility model discloses compact structure, it is reasonable, effectively eliminated the potential difference between the outer lane in the bearing, prolonged the life of motor, the practicality is strong, is applicable to each alternating current motor.
Description
Technical Field
The utility model belongs to the technical field of the motor application technique and specifically relates to an eliminate earthing device of motor shaft electric current.
Background
According to different application occasions and driving modes of the motor, different requirements are imposed on the structure of the motor; for a variable frequency motor driven by a frequency converter, the application is more and more extensive due to the superior performance of smooth speed regulation, but the problem that a bearing and a rotating shaft are damaged due to shaft current generated by potential difference during operation is more and more prominent, and the service life of the bearing is greatly reduced; therefore, for variable frequency motors, elimination of shaft current is one of the important requirements.
In the prior art, the medium-sized motor is generally subjected to modes of insulating bearings, shaft plating ceramics, insulating end covers or conducting rings and the like to eliminate damage of shaft current to the bearings, but the modes have relatively high cost of parts and long purchase period, and are not beneficial to production.
SUMMERY OF THE UTILITY MODEL
The applicant aims at the defects in the prior art and provides the grounding device which is reasonable in structure and can eliminate the current of the motor shaft, so that the overall production cost of the motor is greatly reduced, and the service life of the motor is prolonged.
The utility model discloses the technical scheme who adopts as follows:
a grounding device for eliminating motor shaft current comprises a bearing assembly, a rotating shaft is arranged through the bearing assembly, and a carbon brush device is arranged between the outer side wall of the bearing assembly and the rotating shaft;
the carbon brush device is characterized in that: including installing in the brush yoke mounting panel of bearing assembly lateral wall, brush yoke mounting panel tip installs the carbon brush yoke through the fixed plate, runs through on the carbon brush yoke and installs graphite, is located and installs compression spring on the carbon brush yoke of graphite afterbody, the graphite head stretches out the carbon brush yoke and pastes tightly with the pivot contact under compression spring effect, still including connecting the lead wire between graphite and brush yoke mounting panel.
As a further improvement of the above technical solution:
the structure of the carbon brush holder is as follows: the graphite pressing device comprises frame bodies which are oppositely arranged, wherein the two frame bodies are connected through a plurality of reinforcing ribs to form a plurality of cavities, a first hole is formed in the wall of a first cavity on the left side, a pressing spring is accommodated in the first cavity and clamped with the first hole, graphite is arranged in a second cavity adjacent to the first cavity, the two frame bodies positioned at the bottom of the second cavity extend outwards together to form an annular protruding part, and the head of the graphite extends out of the annular protruding part; the right end parts of the two frame bodies extend inwards to form a third chamber respectively, and the fixing plates are embedded in the third chamber; and a fourth chamber is formed between the two frame bodies positioned between the second chamber and the third chamber.
The structure of the compression spring is as follows: the elastic body is characterized by comprising a V-shaped elastic body, wherein a bulge extends outwards from one side of the elastic body, and a ring-shaped pressing part is fixedly arranged outside the other side of the elastic body; in carbon brush holder was arranged in to the bottom of elastic body, the side joint of arch and carbon brush holder pressed the portion contact and compressed tightly graphite according to the splenium.
The structure of brush yoke mounting panel does: the plate comprises a right-angle plate body, wherein a right-angle edge end of the plate body is provided with a second hole and is connected with a fixing plate through the second hole; and the other right-angle end of the plate body is bent towards the side edge and extends to form a side lug, and a third hole is formed in the side lug and is connected with the bearing assembly through the third hole.
The fixing plate is embedded in the carbon brush holder and is fixed with the brush holder mounting plate through a first bolt.
The brush holder mounting plate is mounted on the outer side wall of the bearing assembly through a second bolt; one end of the lead extends into the end part of the graphite and is integrated with the end part of the graphite, and the other end of the lead is connected with the second bolt through a cable connector.
The utility model has the advantages as follows:
the utility model discloses compact structure, reasonable, convenient operation on the basis that does not change original motor structure and mounting means, through increasing carbon brush device, effectively eliminates the potential difference between the interior lane of bearing, and then eliminates the axle current, and carbon brush device tears open and trades the convenience, has practiced thrift motor production and use cost greatly, and the dependable performance, is applicable to alternating current motor.
The utility model discloses still include following advantage:
the fixing plate is embedded in the carbon brush holder and is fixed with the brush holder mounting plate through a first bolt, so that the carbon brush holder and the brush holder mounting plate are stably and reliably connected;
the pressure of the compression spring enables the head of the graphite to be always attached to the rotating shaft; the position of carbon brush holder installation graphite extends has annular bulge, has further ensured that the laminating contact between graphite and the pivot is more reliable firm.
Drawings
Fig. 1 is a schematic structural view (front view) of the present invention.
Fig. 2 is a schematic structural view (right side view) of the present invention.
Fig. 3 is a schematic structural view (front view) of the carbon brush apparatus of the present invention.
Fig. 4 is a schematic view of the connection between the lead and graphite according to the present invention.
Fig. 5 is a schematic structural view (front view) of the carbon brush holder according to the present invention.
Fig. 6 is a schematic structural view (plan view) of the carbon brush holder according to the present invention.
Fig. 7 is a schematic structural diagram of the compression spring of the present invention.
Fig. 8 is a schematic structural view (front view) of the brush holder mounting plate of the present invention.
Fig. 9 is a schematic structural view (left side view) of the brush holder mounting plate of the present invention.
Wherein: 1. a bearing assembly; 2. a carbon brush device; 3. a rotating shaft; 4. a lead wire; 41. a cable connector; 5. a carbon brush holder; 51. a frame body; 52. a first chamber; 53. reinforcing ribs; 54. a third chamber; 55. bending; 56. an annular protrusion; 57. a second chamber; 58. a first hole; 59. a fourth chamber; 6. a compression spring; 61. an elastic body; 62. a pressing part; 63. a protrusion; 7. graphite; 8. a fixing plate; 9. a first bolt; 10. a brush holder mounting plate; 101. a plate body; 102. a second hole; 103. a lateral ear; 104. a third hole; 11. and a second bolt.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
As shown in fig. 1 and 2, the grounding device for eliminating the current of the motor shaft of the present embodiment includes a bearing assembly 1, a rotating shaft 3 installed through the bearing assembly 1, and a carbon brush device 2 installed between an outer side wall of the bearing assembly 1 and the rotating shaft 3;
as shown in fig. 3, the carbon brush device 2 has the following structure: the carbon brush holder mounting structure comprises a brush holder mounting plate 10 mounted on the outer side wall of a bearing assembly 1, a carbon brush holder 5 is mounted at the end part of the brush holder mounting plate 10 through a fixing plate 8, graphite 7 penetrates through the carbon brush holder 5, a compression spring 6 is mounted on the carbon brush holder 5 located at the tail part of the graphite 7, the head part of the graphite 7 extends out of the carbon brush holder 5 and is tightly attached to a rotating shaft 3 in a contact mode under the action of the compression spring 6, and the carbon brush holder mounting structure further comprises a lead 4 connected between the graphite 7 and the brush holder mounting plate 10.
As shown in fig. 5 and 6, the carbon brush holder 5 has the following structure: the graphite device comprises frame bodies 51 which are oppositely arranged, wherein two frame bodies 51 are connected through a plurality of reinforcing ribs 53 to form a plurality of cavities, a first hole 58 is formed in the wall of a first cavity 52 on the left, a compression spring 6 is accommodated in the first cavity 52 and clamped with the first hole 58, graphite 7 is arranged in a second cavity 57 adjacent to the first cavity 52, the two frame bodies 51 positioned at the bottom of the second cavity 57 jointly extend outwards to form an annular protruding part 56, and the head part of the graphite 7 extends out of the annular protruding part 56; the right end parts of the two frame bodies 51 are respectively provided with a bend 55 extending inwards to form a third chamber 54, and the fixing plate 8 is embedded in the third chamber 54; a fourth chamber 59 is formed between the two frame bodies 51 between the second chamber 57 and the third chamber 54.
As shown in fig. 7, the structure of the pressing spring 6 is: comprises a V-shaped elastic body 61, wherein one side of the elastic body 61 extends outwards to form a bulge 63, and the outer side of the other side is fixedly provided with a ring-shaped pressing part 62; the bottom of the elastic body 61 is arranged in the first chamber 52 of the carbon brush holder 5, the protrusion 63 is clamped with the first hole (58) on the side edge of the carbon brush holder 5, and the pressing part 62 contacts and presses the graphite 7.
As shown in fig. 8 and 9, the brush holder mounting plate 10 has a structure in which: the plate comprises a right-angle plate body 101, wherein a right-angle edge end of the plate body 101 is provided with a second hole 102 and is connected with the fixing plate 8 through the second hole 102; the other right-angle end of the plate body 101 is bent towards the side edge and extends to form a side lug 103, and a hole III 104 is formed in the side lug 103 and is connected with the bearing assembly 1 through the hole III 104.
The fixing plate 8 is embedded in the third chamber 54 of the carbon brush holder 5 and fixed with the brush holder mounting plate 10 through a first bolt 9.
The brush holder mounting plate 10 is mounted on the outer side wall of the bearing assembly 1 through a second bolt 11; one end of the lead 4 extends into the end part of the graphite 7 and is integrated with the end part of the graphite, and the other end of the lead is connected with the second bolt 11 through a cable connector 41.
The utility model discloses a theory of operation does: when the motor runs, shaft voltage is formed between the rotating shaft 3 and the bearing assembly 1, namely the inner ring and the outer ring of the bearing due to potential difference, a passage is formed between the rotating shaft 3 and the bearing assembly 1 through the carbon brush device 2, and further the potential difference between the rotating shaft 3 and the bearing assembly 1 is effectively eliminated.
The compression spring 6 is installed on the carbon brush holder 5 in a compression manner, two sides of the V-shaped elastic body 61 contract towards the middle, the bottom of the V-shaped elastic body is accommodated in the first cavity 52, the bulge 63 on one side is clamped in the hole I58 on the side wall of the carbon brush holder 5, and the pressing part 62 on the outer side of the other side is contacted with and compressed on the tail part of the graphite 7; along with the rotation of the motor rotating shaft 3, the contact part of the graphite 7 and the rotating shaft 3 is abraded, the pressed V-shaped elastic body 61 is outwards bounced, and then the pressing part 62 is driven to push the graphite 7 to extend out of the abrasion compensation part.
The utility model discloses simple structure, compactness, it is reasonable, reduced the damage of axle electric current to bearing, pivot greatly, effectively eliminated the potential difference between the outer lane in the bearing, prolonged the life of motor.
The above description is for the purpose of explanation and not limitation of the invention, which is defined in the claims, and any modifications may be made within the scope of the invention.
Claims (6)
1. A grounding device for eliminating motor shaft current, comprising: the carbon brush device comprises a bearing assembly (1), a rotating shaft (3) is installed to penetrate through the bearing assembly (1), and a carbon brush device (2) is installed between the outer side wall of the bearing assembly (1) and the rotating shaft (3);
the carbon brush device (2) is characterized in that: including installing brush yoke mounting panel (10) in bearing assembly (1) lateral wall, brush yoke mounting panel (10) tip is installed carbon brush holder (5) through fixed plate (8), runs through on carbon brush holder (5) and installs graphite (7), is located and installs pressure spring (6) on carbon brush holder (5) of graphite (7) afterbody, graphite (7) head stretches out carbon brush holder (5) and pastes tightly with pivot (3) contact under pressure spring (6) effect, still including connecting lead wire (4) between graphite (7) and brush yoke mounting panel (10).
2. A grounding device for eliminating motor shaft current as in claim 1 wherein: the structure of the carbon brush holder (5) is as follows: the device comprises frame bodies (51) which are oppositely arranged, wherein the two frame bodies (51) are connected through a plurality of reinforcing ribs (53) to form a plurality of chambers, a first hole (58) is formed in the wall of a first chamber (52) on the left, the compression spring (6) is accommodated in the first chamber (52) and clamped with the first hole (58), graphite (7) is installed in a second chamber (57) adjacent to the first chamber (52), the two frame bodies (51) positioned at the bottom of the second chamber (57) jointly extend outwards to form an annular protruding part (56), and the head of the graphite (7) extends out of the annular protruding part (56); the right end parts of the two frame bodies (51) are respectively provided with a bend (55) extending inwards to form a third chamber (54), and the fixing plate (8) is embedded in the third chamber (54); a fourth chamber (59) is formed between the two frame bodies (51) positioned between the second chamber (57) and the third chamber (54).
3. A grounding device for eliminating motor shaft current as in claim 1 wherein: the structure of the compression spring (6) is as follows: comprises a V-shaped elastic body (61), one side of the elastic body (61) extends outwards to form a bulge (63), and the outer side of the other side is fixedly provided with a ring-shaped pressing part (62); the bottom of the elastic body (61) is arranged in the carbon brush holder (5), the protrusion (63) is clamped with the side edge of the carbon brush holder (5), and the pressing part (62) is contacted with and presses the graphite (7).
4. A grounding device for eliminating motor shaft current as in claim 1 wherein: the structure of the brush holder mounting plate (10) is as follows: the plate comprises a right-angle plate body (101), wherein a right-angle edge end of the plate body (101) is provided with a second hole (102) and is connected with a fixing plate (8) through the second hole (102); the end head of the other right-angle side of the plate body (101) is bent towards the side edge and extends to form a side lug (103), and a third hole (104) is formed in the side lug (103) and is connected with the bearing assembly (1) through the third hole (104).
5. A grounding device for eliminating motor shaft current as in claim 1 wherein: the fixing plate (8) is embedded in the carbon brush holder (5) and is fixed with the brush holder mounting plate (10) through a first bolt (9).
6. A grounding device for eliminating motor shaft current as in claim 1 wherein: the brush holder mounting plate (10) is mounted on the outer side wall of the bearing assembly (1) through a second bolt (11); one end of the lead (4) extends into the end part of the graphite (7) and is integrated with the end part of the graphite, and the other end of the lead is connected with the second bolt (11) through a cable connector (41).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920873229.4U CN209844775U (en) | 2019-06-11 | 2019-06-11 | Grounding device for eliminating motor shaft current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920873229.4U CN209844775U (en) | 2019-06-11 | 2019-06-11 | Grounding device for eliminating motor shaft current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209844775U true CN209844775U (en) | 2019-12-24 |
Family
ID=68898353
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920873229.4U Active CN209844775U (en) | 2019-06-11 | 2019-06-11 | Grounding device for eliminating motor shaft current |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209844775U (en) |
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2019
- 2019-06-11 CN CN201920873229.4U patent/CN209844775U/en active Active
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