CN219046440U

CN219046440U - Brushless corona motor

Info

Publication number: CN219046440U
Application number: CN202122152020.9U
Authority: CN
Inventors: 严自新; 宋金梅
Original assignee: Changzhou Yunkong Electronic Co ltd
Current assignee: Changzhou Yunkong Electronic Co ltd
Priority date: 2021-09-07
Filing date: 2021-09-07
Publication date: 2023-05-19
Anticipated expiration: 2031-09-07

Abstract

The utility model discloses a brushless corona motor, which comprises a rotor, a front cover assembly, a stator assembly and a rear cover assembly, wherein two ends of the rotor are respectively connected with a collecting ring arranged in the rear cover assembly through the front cover assembly and the rear cover assembly; the front cover assembly comprises a front end cover, and a front insulating sleeve is arranged in the front end cover; a front bearing is arranged in the insulating sleeve, a rear insulating sleeve is arranged in the rear cover assembly, and a rear bearing is arranged in the rear insulating sleeve; the rotor is in running fit with the front bearing, the rear bearing and the stator assembly; the rear cover assembly further comprises an insulating pad, a brush assembly and a rear end cover; the brush subassembly is installed on the rear end cover, and the insulating pad sets up in the back insulating sleeve, is located the back bearing side, and back insulating sleeve, insulating pad, brush subassembly are for the solid-state drive fit of collecting ring. The utility model has good prevention effect on the shaft current of the high-voltage motor, has positive effect on safe production, long service life and low maintenance cost.

Description

Brushless corona motor

Technical Field

The utility model relates to a motor, in particular to a brushless corona motor.

Background

At present, the motor body is required to have a large amount of charges in the industries of semiconductors, automatic control, surface treatment and the like, because the oil film of the rolling bearing is generally thinner, the shaft voltage is sensitive, and when the shaft current flows through the fine contact points of the rolling body and the inner ring and the outer ring, if the voltage is higher, the contact surfaces of the inner ring and the outer ring can generate breakdown marks. For lower shaft voltage, the lubricating oil film can still protect the insulating property and cannot generate shaft current. However, when the shaft voltage increases to a certain value, particularly when the motor is started, a lubricating oil film in the bearing is not formed stably, the shaft voltage breaks down the oil film to discharge, a loop is formed, shaft current passes through metal contact points of the bearing and the rotating shaft, the metal contact points are small, so that the current density of the points is high, high temperature is instantaneously generated, the bearing is locally burned and melted, the burned and melted bearing alloy splashes under the action of rolling force, small pits are burned on the inner surface of the bearing, and the service life of the motor bearing is greatly shortened. Although customers also try to use ceramic bearings, the motor is noisier, difficult to install, and expensive.

Disclosure of Invention

The utility model mainly aims to reduce damage of shaft current to a bearing, prolong the service life of a motor in special occasions and aim at the formation condition of the shaft current: the first is the voltage with the axis and the second is the loop. We take the following precautions: (1) The grounding carbon brush is arranged at the shaft end to reduce the shaft potential, ensure that the grounding carbon brush is reliably grounded and reliably contacted with the rotating shaft, ensure that the potential of the rotating shaft is zero, and eliminate the shaft current. (2) An insulating sleeve is added between the bearing chamber hole of the end cover and the bearing to cut off the loop of the shaft current.

The technical scheme of the utility model is as follows:

the brushless corona motor comprises a rotor, a front cover assembly, a stator assembly and a rear cover assembly, wherein two ends of the rotor are respectively connected with a collecting ring arranged in the rear cover assembly through the front cover assembly and the rear cover assembly, and one end of the rear cover assembly is connected with the collecting ring arranged in the rear cover assembly; the front cover assembly comprises a front end cover, wherein a front insulating sleeve is arranged in the front end cover and is fixedly connected with the front end cover; a front bearing is arranged in the insulating sleeve, a rear insulating sleeve is arranged in the rear cover assembly, and a rear bearing is arranged in the rear insulating sleeve; the rotor is in running fit with the front bearing, the rear bearing and the stator assembly; the rear cover assembly further comprises an insulating pad, an electric brush assembly and a rear end cover; the electric brush assembly is arranged on the rear end cover, the insulating pad is arranged in the rear insulating sleeve and is positioned beside the rear bearing, the rear insulating sleeve, the insulating pad and the electric brush assembly are relatively static and relatively rotate with the collecting ring, and the electric brush assembly has the function of isolating the inner ring and the outer ring of the bearing from generating current, but the rotating shaft can be electrified.

Preferably, the front end cover is integrally injection molded with the front insulating sleeve.

Preferably, the rear end cover is integrally injection molded with the rear insulating sleeve.

Preferably, the collecting ring is fixedly connected with the rotor and is relatively static.

The beneficial effects of the utility model are as follows:

the utility model can be used in special occasions with electrified motor shells, the actual service life can be prolonged from tens of hours to tens of thousands of hours, the effect is obvious, the prevention effect on the shaft current of the high-voltage motor is especially good, the active effect on the safety production is long, and the maintenance cost is low.

Drawings

Fig. 1 is a schematic structural view of the present utility model.

Detailed Description

The utility model is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present utility model, and are not intended to limit the scope of the present utility model.

As shown in fig. 1, a brushless corona motor comprises a rotor 1, a front cover assembly 2, a stator assembly 4 and a rear cover assembly 5, wherein two ends of the rotor 1 are respectively connected with a collector ring 5-4 arranged in the rear cover assembly 5 through the front cover assembly 2 and the rear cover assembly 5 and one end of the rear cover assembly 5; the front cover assembly 2 comprises a front end cover 2-2, wherein a front insulating sleeve 2-1 is arranged in the front end cover 2-2 and is fixedly connected; a front bearing 3-1 is arranged in the insulating sleeve 2-1, a rear insulating sleeve 5-1 is arranged in the rear cover assembly 5, and a rear bearing 3-2 is arranged in the rear insulating sleeve 5-1; the rotor 1 is in running fit with the front bearing 3-1, the rear bearing 3-2 and the stator assembly 4; the rear cover assembly 5 further comprises an insulating pad 5-2, a brush assembly 5-3 and a rear end cover 5-5; the electric brush assembly 5-3 is arranged on the rear end cover 5-5, the insulating pad 5-2 is arranged in the rear insulating sleeve 5-1 and is positioned beside the rear bearing 3-2, and the rear insulating sleeve 5-1, the insulating pad 5-2 and the electric brush assembly 5-3 are relatively static and relatively rotate with the collecting ring 5-4, so that the electric brush assembly has the function of isolating the current generation of the inner ring and the outer ring of the bearing and the electrification of the rotating shaft.

Preferably, the front end cover 2-2 is integrally injection molded with the front insulating cover 2-1.

Preferably, the rear end cap 5-5 is integrally injection molded with the rear insulating cover 5-1.

Preferably, the slip ring 5-4 is fixedly connected with the rotor 1 and is relatively stationary.

Compared with a conventional permanent magnet synchronous motor, the utility model performs continuous operation for 300 hours under the same condition comparison, and the result is as follows:

from the data, it can be seen that after the conventional permanent magnet synchronous is operated for a period of time, abnormal sound appears on the bearing, and the current becomes large; and the novel motor operates steadily and can normally operate for a long time.

The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present utility model, and such modifications and variations should also be regarded as being within the scope of the utility model.

Claims

1. The brushless corona motor is characterized by comprising a rotor (1), a front cover assembly (2), a stator assembly (4) and a rear cover assembly (5), wherein two ends of the rotor (1) are respectively connected with the rear cover assembly (5) through the front cover assembly (2), and one end of the rear cover assembly (5) is connected with a collector ring (5-4) arranged in the rear cover assembly (5); the front cover assembly (2) comprises a front end cover (2-2), wherein a front insulating sleeve (2-1) is arranged in the front end cover (2-2) and is fixedly connected; a front bearing (3-1) is arranged in the insulating sleeve (2-1), a rear insulating sleeve (5-1) is arranged in the rear cover assembly (5), and a rear bearing (3-2) is arranged in the rear insulating sleeve (5-1); the rotor (1) is in running fit with the front bearing (3-1), the rear bearing (3-2) and the stator assembly (4); the rear cover assembly (5) further comprises an insulating pad (5-2), a brush assembly (5-3) and a rear end cover (5-5); the electric brush assembly (5-3) is arranged on the rear end cover (5-5), the insulating pad (5-2) is arranged in the rear insulating sleeve (5-1) and is positioned beside the rear bearing (3-2), the rear insulating sleeve (5-1), the insulating pad (5-2) and the electric brush assembly (5-3) are relatively static and relatively rotate with the collecting ring (5-4), and the electric brush assembly has the function of isolating the current generation of the inner ring and the outer ring of the bearing and the electrification of the rotating shaft.

2. A brushless corona motor as claimed in claim 1, wherein: the front end cover (2-2) and the front insulating sleeve (2-1) are integrally injection molded.

3. A brushless corona motor as claimed in claim 1, wherein: the rear end cover (5-5) and the rear insulating sleeve (5-1) are integrally injection molded.

4. A brushless corona motor as claimed in claim 1, wherein: the collecting ring (5-4) is fixedly connected with the rotor (1) and is relatively static.