Ground brush device of alternating current variable frequency motor

A grounding brush, AC frequency conversion technology, applied in the direction of electromechanical devices, electrical components, etc., can solve the problems of shaft current not hindering, burning out bearings, etc., to achieve the effect of simple structure and obvious effect.

Inactive Publication Date: 2012-04-04
SEC ELECTRIC MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

like figure 1 As shown, the existing grounding brushes 101 are installed on the bearing oute

Method used

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  • Ground brush device of alternating current variable frequency motor
  • Ground brush device of alternating current variable frequency motor
  • Ground brush device of alternating current variable frequency motor

Examples

Experimental program
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Effect test

Embodiment Construction

[0012] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0013] Such as figure 2 , image 3 As shown, the present invention includes a metal pipe 1, a galvanized steel hex bolt 2, a galvanized steel washer 3, a galvanized spring washer 4, a plate 5, a cylindrical pin 6, a connecting plate 7, a fixed brush box plate 8, an electric brush 9, Brush box 10 and insulating bearing sleeve 11. The brush 9 is installed in the brush box 10, the brush 9 and the brush box 10 are fixed by the fixed brush box plate 8 and then connected to the connection plate 7, the connection plate 7 is connected to the plate 5 through the cylindrical pin 6, the metal pipe 1 and the plate 5 and then connect to the insulating bearing sleeve 11 through the galvanized steel hex bolt 2, the galvanized steel washer 3, and the galvanized spring washer 4.

[0014] The installation process of the present invention is as follows: th...

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PUM

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Abstract

The invention provides a ground brush device of an alternating current variable frequency motor, which comprises a metal tube, a zinc plated steel hexagon bolt, a zinc coated steel washer, a zinc plated spring washer, a plate, a cylindrical pin, a connecting plate, a fixed brush box plate, a brush, a brush box and an insulated bearing sleeve; the brush is mounted in the brush box; the brush, the brush box and the fixed brush box plate are fixed and connected to the connecting plate; the connecting plate is connected with the plate through the cylindrical pin; and the metal tube and the plate are connected to the insulated bearing sleeve through the zinc plated steel hexagonal bolt, the zinc plated steel washer and the zinc plated spring washer. The ground brush is mounted on the insulated bearing sleeve, so that passing of axial current can be completely blocked to cut off an axial current loop so as to realize the aim of protecting the bearing.

Description

technical field [0001] The invention relates to a grounding brush device of an AC variable frequency motor. Background technique [0002] When the AC variable frequency motor is running, due to the unbalanced stator magnetic circuit, the alternating magnetic flux around the shaft cuts the shaft, and the shaft voltage is induced at both ends of the shaft, and the shaft forms a closed circuit with the two bearings and the machine base to generate shaft current. The high temperature generated by the partial discharge energy release of the axial current can melt many tiny areas on the inner ring, outer ring or ball of the bearing to form grooves, thereby generating noise and vibration. Therefore, it is necessary to take reasonable and reliable measures to prevent shaft current and protect the bearing structure of variable frequency high voltage motor. [0003] At present, the AC variable frequency motor generally adopts the grounding brush device to ground the shaft current to ...

Claims

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Application Information

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IPC IPC(8): H02K13/00
Inventor 王宝慧
Owner SEC ELECTRIC MACHINERY
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