CN107947492B

CN107947492B - Structure for eliminating current of motor shaft

Info

Publication number: CN107947492B
Application number: CN201610891844.9A
Authority: CN
Inventors: 周明; 郭建文
Original assignee: Shanghai Dajun Technologies Inc
Current assignee: Shanghai Dajun Technologies Inc
Priority date: 2016-10-13
Filing date: 2016-10-13
Publication date: 2020-03-06
Anticipated expiration: 2036-10-13
Also published as: CN107947492A

Abstract

The invention discloses a structure for eliminating current of a motor shaft, which comprises a motor shell, a stator, a rotating shaft and an end cover, wherein the end cover is arranged on the end surface of the motor shell, an iron core of the stator is connected with a grounding point through the motor shell. This structure preparation is convenient, can realize circumference contact ground connection, and the ground connection is respond well, effectively blocks the production of axle current, improves and blocks the performance, ensures the normal operating of motor, reduces the equipment maintenance cost.

Description

Structure for eliminating current of motor shaft

Technical Field

The invention relates to a structure for eliminating current of a motor shaft.

Background

The current of the motor shaft is generated for various reasons, generally because in a magnetic loop formed by the shaft, the bearing sleeve, the end cover and the base of the motor, magnetic flux which changes along with time passes through, electric potential is induced on the shaft, and the current is generated in the loop; meanwhile, when the motor runs, the stator and the rotor generate peak voltage, so that shaft current is formed, and when the shaft current flows through the bearing, an electric corrosion phenomenon is formed. If the shaft current exceeds the value allowed by the bearing, the discharge or the conduction can be realized through an oil film, punctiform micropores can be formed at the bearing bush and the bearing, the blackening phenomenon can be generated at the bottom, the shaft or the bearing can be damaged in serious conditions, the normal operation of the motor is influenced, and the maintenance cost of equipment is increased. Generally, the current of the blocking shaft mainly depends on an insulating pad below a bearing seat, or an insulating bearing and a grounding carbon brush are adopted, but the reliability is poor, and the performance of blocking the current of the shaft is reduced in severe environment or after long service life.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a structure for eliminating the current of a motor shaft, the structure is convenient to manufacture, can realize circumferential contact grounding, has a good grounding effect, effectively blocks the generation of the shaft current, improves the blocking performance, ensures the normal operation of the motor, and reduces the maintenance cost of equipment.

In order to solve the technical problem, the structure for eliminating the current of the motor shaft comprises a motor shell, a stator, a rotating shaft and an end cover, wherein the end cover is arranged on the end face of the motor shell, an iron core of the stator is connected with a grounding point through the motor shell.

Further, the conductive brush assembly comprises a flange sleeve, a pressing block, a pressing ring and a conductive brush, guide grooves are formed in the circumferential surface of the flange sleeve at intervals, the root of the conductive brush is arranged in the guide grooves, the pressing block is arranged in the guide grooves and tightly presses the root of the conductive brush, the pressing ring is sleeved on the outer ring of the flange sleeve and tightly hoops the pressing block, and the flange sleeve is sleeved on the outer ring of the support.

Further, the flange sleeve is connected with the support through interference, threads or clamping springs.

The structure for eliminating the current of the motor shaft adopts the technical scheme, namely the structure comprises a motor shell, a stator, a rotating shaft and an end cover, wherein the end cover is arranged on the end surface of the motor shell, an iron core of the stator is connected with a grounding point through the motor shell. This structure preparation is convenient, can realize circumference contact ground connection, and the ground connection is respond well, effectively blocks the production of axle current, improves and blocks the performance, ensures the normal operating of motor, reduces the equipment maintenance cost.

Drawings

The invention is described in further detail below with reference to the following figures and embodiments:

FIG. 1 is a schematic diagram of the present invention for eliminating the current on the shaft of a motor;

FIG. 2 is an enlarged view of portion A of FIG. 1;

FIG. 3 is a schematic view of the structure of the brush assembly.

Detailed Description

Fig. 1 and 2 show an embodiment of the present invention, in which the structure for eliminating current of a motor shaft includes a motor housing 1, a stator 2, a rotating shaft 3, an end cover 4, the end cover 4 is disposed on an end surface of the motor housing 1, an iron core of the stator 2 is connected to a grounding point 5 via the motor housing 1, the structure further includes a bracket 6 and a conductive brush assembly 7, the bracket 6 is disposed on an inner side surface of the end cover 4, a cavity 31 is disposed on an end surface of the rotating shaft 3, the bracket 6 extends into the cavity 31 on the end surface of the rotating shaft 3, the conductive brush assembly 7 is sleeved in the bracket 6 and is located in the cavity 31 on the end surface of the rotating shaft 3, and a conductive brush 74 of the conductive brush assembly 7 contacts.

As shown in fig. 3, preferably, the conductive brush assembly 7 includes a flange sleeve 71, a pressing block 72, a pressing ring 73 and a conductive brush 74, wherein a guide groove 75 is formed at intervals on the sleeve circumferential surface of the flange sleeve 71, the root of the conductive brush 74 is arranged in the guide groove 75, the pressing block 72 is arranged in the guide groove 75 and presses the root of the conductive brush 74, the pressing ring 73 is sleeved on the sleeve outer ring of the flange sleeve 71 and tightly grips the pressing block 72, and the flange sleeve 71 is sleeved on the bracket outer ring.

Preferably, the flange sleeve 71 is connected with the bracket through interference, threads or snap springs.

In this structure, the spike voltage of stator can be eliminated through motor casing's earthing terminal in the motor operation process, and the support that rotor, pivot return circuit formed, conductive brush subassembly eliminate through being connected with the end cover, conductive brush subassembly's conductive brush is the periphery and contacts with the pivot to improve the reliability of contact, effectively block the production of axle current, avoid the damage of bearing or pivot, and ensure the normal operating of motor, reduced the equipment maintenance cost.

Claims

1. A structure for eliminating current of a motor shaft comprises a motor shell, a stator, a rotating shaft and an end cover, wherein the end cover is arranged on the end face of the motor shell, and an iron core of the stator is connected with a grounding point through the motor shell, and the structure is characterized in that: the structure further comprises a support and a conductive brush assembly, the support is arranged on the inner side face of the end cover, a cavity is formed in the end face of the rotating shaft, the support stretches into the cavity of the end face of the rotating shaft, the conductive brush assembly is sleeved into the support and located in the cavity of the end face of the rotating shaft, the conductive brush of the conductive brush assembly is in contact with the inner wall of the cavity of the end face of the rotating shaft, the conductive brush assembly comprises a flange sleeve, a pressing block, a pressing ring and a conductive brush, guide grooves are formed in the circumferential surface of the sleeve of the flange at intervals, the roots of the conductive brush are arranged in the guide grooves, the pressing block is arranged in the guide grooves and tightly presses the roots of the conductive brush, the pressing ring is sleeved into the outer ring of the sleeve of the flange and.

2. The structure for eliminating current on the shaft of an electric motor according to claim 1, wherein: the flange sleeve is connected with the support through interference, threads or clamping springs.