CN219018630U

CN219018630U - Motor rotor shaft current dredging device based on spring contact structure

Info

Publication number: CN219018630U
Application number: CN202223400708.5U
Authority: CN
Inventors: 李问国; 张方方; 付宏宝
Original assignee: Jiujiang Hantang Photoelectric Transmission Technology Co ltd
Current assignee: Jiujiang Hantang Photoelectric Transmission Technology Co ltd
Priority date: 2022-12-19
Filing date: 2022-12-19
Publication date: 2023-05-12
Anticipated expiration: 2032-12-19

Abstract

The utility model discloses a motor rotor shaft current dredging device based on a spring contact structure, which comprises a motor shell, a motor bearing, a motor rotating shaft, a spring seat, a conductive spring and a mounting screw, wherein the spring seat consists of a spring seat cover and a spring support tube, a spring groove is formed in the inner wall of the left end of the spring support tube, the conductive spring is arranged in the spring groove, the spring seat provided with the conductive spring is pushed into the motor rotating shaft, and then a rotor bracket is fixed on the motor rotating shaft in a tight fit mode. The utility model has the following beneficial effects: 1. the conductive spring is used as a contact part between the rotating ends of the stator and the rotor, so that a rotor grounding forming a dredging loop is realized, and shaft voltage and shaft current can be effectively directed and dredged, thereby prolonging the service life of the bearing; 2. the conductive spring can be quickly replaced, the conductive spring is convenient to mount and dismount, and the maintenance is easy; 3. low cost, no dust and secondary pollution.

Description

Motor rotor shaft current dredging device based on spring contact structure

Technical Field

The utility model relates to a shaft current guiding device, in particular to a motor rotor shaft current guiding device based on a spring contact structure.

Background

The high-speed motor has the characteristics of small volume, high power density, direct connection with a driving load, omission of a traditional mechanical speed increasing device, reduction of system noise and transmission efficiency, and has wide application prospect in future novel equipment such as new energy automobiles, energy storage flywheels, high-speed centrifugal compressors and the like, and the high-speed motor has become one of research hotspots in the field of international electrician at present.

When the high-speed motor adopts variable frequency power supply, firstly, because the power supply voltage contains higher harmonic components, under the action of the voltage pulse wave components, electromagnetic induction is generated between the coil end part of the stator winding, the wiring part and the rotating shaft, so that the potential of the rotating shaft is changed, and shaft voltage is generated; secondly, more high-voltage equipment is arranged around the high-speed motor, and shaft voltage is induced at two ends of the rotating shaft under the action of a strong magnetic field; in addition, the axial voltage is generated by the accumulation of static charges, the lowering of the junction edge of the induction element, the damage and other factors; after the shaft voltage is formed, once a loop is formed between the shaft and the housing, the shaft current is generated.

Under normal conditions, the rotating shaft and the bearing have a lubricating oil film, the oil film has an insulating effect, when the shaft voltage is lower, the lubricating oil film has an insulating property, but when the shaft voltage is increased to a certain value (particularly, when a high-speed motor is started, the oil film in the bearing is not formed stably), the shaft voltage breaks down the oil film to discharge so as to form shaft current, the shaft current passes through the bearing, and because the contact area of the bearing is small, the contact part instantaneously generates high temperature, so that the bearing is locally corroded electrically, and the service life of the bearing and equipment is shortened.

At present, the main modes for solving the problems of shaft voltage and shaft current are two modes, namely a partition mode and a dredging mode, wherein the partition mode mainly adopts an insulating bearing mode, such as a ceramic ball bearing, but has high cost and inconvenient replacement; the conducting oil seal, the conducting carbon brush and the carbon fiber ring can be adopted in the dredging mode, and the problems are that the replacement is inconvenient, dust and secondary pollution are easy to generate, and new abrasion is caused to the bearing.

Disclosure of Invention

The utility model aims to provide a motor rotor shaft current dredging device based on a spring contact structure, which has the characteristics of being capable of dredging shaft current in a rotor high-speed rotation state and being convenient to detach and replace.

The purpose of the utility model is realized in the following way:

a motor rotor shaft current dredging device based on a spring contact structure is characterized in that: the motor comprises a motor shell, a motor bearing, a motor rotating shaft, a spring seat, a conductive spring and a mounting screw, wherein the outer side wall of the motor bearing is sleeved on the inner wall of the left end of the tubular motor shell in a tight fit manner, the inner side wall of the motor bearing is sleeved on the outer wall of the middle part of the motor rotating shaft in a tight fit manner, and the motor rotating shaft can relatively rotate with the motor shell through the motor bearing; the spring seat made of metal materials consists of a spring seat cover and a spring supporting tube, the right end of the annular spring supporting tube is vertically fixed on the middle part of the inner wall of the disc-shaped spring seat cover, the inner diameter of the spring supporting tube is slightly larger than the outer diameter of the right end of the motor rotating shaft, the right end of the motor rotating shaft is sleeved into the spring supporting tube from left to right, an annular spring groove is formed in the inner wall of the left end of the spring supporting tube, a conductive spring is placed in the spring groove, the outer wall of the conductive spring is contacted with the inner wall of the spring groove, the inner wall of the conductive spring is contacted with the outer wall of the right end of the motor rotating shaft, and the spring seat cover is fixed on the right end face of the motor shell through a mounting screw to seal a motor rotating shaft cavity.

The utility model relates to a motor rotor shaft current dredging device which comprises a motor shell, a motor bearing, a motor rotating shaft, a spring seat, a conductive spring and a mounting screw, wherein the spring seat made of metal materials consists of a spring seat cover and a spring support, a spring groove is formed in the inner wall of the left end of a spring support tube, the conductive spring is mounted in the spring groove, the spring seat provided with the conductive spring is pushed into the motor rotating shaft, and then a rotor support is fixed on the motor rotating shaft in a tight fit mode. The outer wall of the annular conductive spring is contacted with the inner wall of the spring groove, the inner wall of the conductive spring is contacted with the outer wall of the motor rotating shaft, and the elastic compression deformation of the conductive spring can form a continuous grounding loop in the rotating working state of the motor rotor.

Compared with the prior art, the utility model has the following beneficial effects:

1. the conductive spring is used as a contact part between the rotating ends of the stator and the rotor, so that a rotor grounding forming a dredging loop is realized, and shaft voltage and shaft current can be effectively directed and dredged, thereby prolonging the service life of the bearing;

2. compared with the traditional partition and dredging modes, the conductive spring is designed into a wear part, has the functions of automatic non-concentricity compensation and automatic centering of elasticity, can be quickly replaced, is convenient to install and disassemble and is easy to maintain;

3. low cost, no dust and secondary pollution.

Drawings

FIG. 1 is a schematic view of the overall structure of the present utility model;

FIG. 2 is a schematic diagram of a conductive spring;

fig. 3 is a schematic structural view of a spring seat.

Detailed Description

The utility model will be described in further detail below with reference to examples and with reference to the accompanying drawings.

The motor rotor shaft current dredging device based on the spring contact structure comprises a motor shell 1, a motor bearing 2, a motor rotating shaft 3, a spring seat 4, a conductive spring 5 and a mounting screw 6, wherein the outer side wall of the motor bearing 2 is sleeved on the inner wall of the left end of the tubular motor shell 1 in a tight fit manner, the inner side wall of the motor bearing 2 is sleeved on the outer wall of the middle part of the motor rotating shaft 3 in a tight fit manner, and the motor rotating shaft 3 can relatively rotate with the motor shell 1 through the motor bearing 2; the spring seat 4 made of metal materials consists of a spring seat cover 7 and a spring support tube 8, the right end of the annular spring support tube 8 is vertically fixed on the middle part of the inner wall of the disc-shaped spring seat cover 7, the inner diameter of the spring support tube 8 is slightly larger than the outer diameter of the right end of the motor bearing 2, the right end of the motor bearing 2 is sleeved into the spring support tube 8 from left to right, an annular spring groove 10 is formed in the inner wall of the left end of the spring support tube 8, a conductive spring 5 is placed in the spring groove 10, the outer wall of the conductive spring 5 is contacted with the inner wall of the spring groove 10, the inner wall of the conductive spring 5 is contacted with the outer wall of the right end of the motor bearing 2, and the spring seat cover 7 is fixed on the right end face of the motor casing 1 through a mounting screw 6 to seal a motor rotating shaft cavity 9.

The conductive spring 5 is made of an annular inclined ring conductive material, the outer wall of the conductive spring 5 of the inclined ring structure is contacted with the inner wall of the groove of the spring seat 4, the inner wall of the conductive spring 5 is contacted with the outer pressure wall of the motor rotating shaft 3 through the inclined ring spring, and the elastic compression deformation of the inclined ring spring can form a continuous grounding loop under the industrial and mining condition of the rotation of the rotor.

The spring groove 10 is in close contact with the outer ring of the conductive spring 5.

Working principle: when the motor rotates at a high speed, the formed shaft voltage is converged on the motor rotating shaft 3, the motor rotating shaft 3 sequentially passes through the conductive spring 5 and the spring seat 4, and finally the motor rotating shaft is transmitted to the motor casing 1 through the spring seat 4 by the mounting screw 6, so that a motor rotor grounding dredging shaft current loop is formed.

Claims

1. A motor rotor shaft current dredging device based on a spring contact structure is characterized in that: the motor comprises a motor shell, a motor bearing, a motor rotating shaft, a spring seat, a conductive spring and a mounting screw, wherein the outer side wall of the motor bearing is sleeved on the inner wall of the left end of the tubular motor shell in a tight fit manner, the inner side wall of the motor bearing is sleeved on the outer wall of the middle part of the motor rotating shaft in a tight fit manner, and the motor rotating shaft can relatively rotate with the motor shell through the motor bearing; the spring seat made of metal materials consists of a spring seat cover and a spring supporting tube, the right end of the annular spring supporting tube is vertically fixed on the middle part of the inner wall of the disc-shaped spring seat cover, the inner diameter of the spring supporting tube is slightly larger than the outer diameter of the right end of the motor rotating shaft, the right end of the motor rotating shaft is sleeved into the spring supporting tube from left to right, an annular spring groove is formed in the inner wall of the left end of the spring supporting tube, a conductive spring is placed in the spring groove, the outer wall of the conductive spring is contacted with the inner wall of the spring groove, the inner wall of the conductive spring is contacted with the outer wall of the right end of the motor rotating shaft, and the spring seat cover is fixed on the right end face of the motor shell through a mounting screw to seal a motor rotating shaft cavity.

2. The spring contact structure-based motor rotor shaft current diverting device according to claim 1, wherein: the conductive spring is an annular inclined ring conductive spring.

3. The spring contact structure-based motor rotor shaft current diverting device according to claim 1, wherein: the spring groove is in close contact with the conductive spring outer ring.