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Ground connection structure for reducing shaft voltage of double-fed wind generator

A technology for wind turbines and grounding structures, applied in the direction of structural connection, connection with grounding devices, electrical components, etc., can solve the problems of insufficient shaft voltage reduction structure, damage to insulation layer, high cost, etc., and achieve reasonable structure, The effect of reducing shaft voltage and increasing reliability

Inactive Publication Date: 2014-02-12
SEC ELECTRIC MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

In addition to the high cost, this method is also prone to failure in actual operation: first, the insulation layer of the insulating bearing is likely to be damaged during transportation, assembly and operation; The oil injection pipe is easy to bypass the insulating layer of the bearing seat and directly touch the end cover to be grounded
[0006] For wind power systems with zero-maintenance and high-reliability requirements, it is gradually not enough to rely on the above-mentioned traditional structure to reduce shaft voltage

Method used

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  • Ground connection structure for reducing shaft voltage of double-fed wind generator

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Embodiment Construction

[0015] Below the present invention will be further described in conjunction with the embodiment in the accompanying drawing:

[0016] Such as figure 1 As shown, the present invention mainly includes a shaft extension end connection shaft carbon brush 3, a machine base shell 2 and a non-shaft extension end connection shaft carbon brush 1, the shaft extension end connection shaft carbon brush 3 is installed on the shaft extension end of the generator, and the non-shaft end connection shaft carbon brush 1 The shaft carbon brush 1 at the extension end is installed on the non-shaft extension end of the generator. The frame shell 2 is fixed on the motor foundation 4 .

[0017] The shaft carbon brush 3 at the extension end, the frame housing 2 and the carbon brush 1 at the non-extension end shaft are connected sequentially through the electrical connection wire 5, so that they maintain zero potential at the same time, and do not form a current loop, thus avoiding the loss of shaft c...

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Abstract

The invention relates to a motor ground connection structure, in particular to a ground connection structure for reducing the shaft voltage of a double-fed wind generator, and belongs to the technical field of wind generators. The ground connection structure comprises a shaft extension terminating shaft carbon brush, a machine base outer shell and a non-shaft extension terminating shaft carbon brush all of which are sequentially connected through an electric connecting line. The ground connection structure is low in cost, reasonable in structure and obvious in effect, a method for reducing the shaft voltage is added, the ground connection structure is suitable for being applied in a wind power system with requirements for zero maintenance and high reliability, and the reliability of wind electricity operation is improved.

Description

technical field [0001] The invention relates to a grounding structure of a motor, in particular to a grounding structure for reducing shaft voltage of a double-fed wind power generator, and belongs to the technical field of wind power generators. Background technique [0002] During the operation of the generator set, the rotor axially induces the shaft electromotive force due to the unbalanced magnetic flux. Poor joint when the valve core is assembled), uneven armature response and other reasons. The shaft electromotive force will form a closed loop along the rotor shaft, bearing, and machine base. Since the loop resistance is very small, although the shaft voltage is not high, it is enough to break down the oil film between the shaft and the bearing, and discharge occurs, sometimes reaching hundreds of amperes. The shaft current will gradually deteriorate the lubricating and cooling grease, and produce point-like micropores at the bearing pad and bearing, and even burn th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K11/00H02K11/40
Inventor 许明宇檀华廷施洪
Owner SEC ELECTRIC MACHINERY
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