Motor driving shaft grounding device and motor

A technology of grounding device and drive shaft, which is applied in the direction of connection with the grounding device, motor generator connector, circuit, etc., can solve the problems of motor bearing damage, failure, and affecting the work of the motor bearing, and achieve the elimination of common mode current and common mode voltage, the effect of preventing failure

Pending Publication Date: 2019-02-01
SIEMENS CHINA
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AI Technical Summary

Problems solved by technology

[0002] Existing motors, such as AC motors that feed PMW inverters, may generate common-mode currents between the drive shaft of the motor and the motor casing during operation, and the induced common-mode voltage/current will flow to the motor through the drive shaft bearings, which may c

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  • Motor driving shaft grounding device and motor
  • Motor driving shaft grounding device and motor

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Embodiment Construction

[0035] In order to have a clearer understanding of the technical features, purposes and effects of the invention, the specific embodiments of the present invention are now described with reference to the accompanying drawings, in which the same reference numerals represent components with the same or similar structures but the same functions.

[0036] In this article, "schematic" means "serving as an example, example or illustration", and any illustration or implementation described as "schematic" should not be interpreted as a more preferred or more advantageous Technical solutions.

[0037] In order to make the drawing concise, each drawing only schematically shows the parts related to the present invention, and they do not represent the actual structure of the product. In addition, in order to make the drawings concise and easy to understand, in some drawings, only one of the components having the same structure or function is schematically shown, or only one of them is mar...

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Abstract

The invention discloses a motor driving shaft grounding device. A conductive sealing ring (12) sleeves the driving shaft (20) in a sealing mode and rotates along with the driving shaft; the conductivesealing ring forms a first sealing surface along the side surface, axially deviating from the motor, of the driving shaft; the first sealing surface is provided with multiple first annular parts (122) arranged radially; one side of the first sealing surface of the conductive sealing ring is provided with a sleeving part (124); a conductive fixing ring (14) is fixed on a motor housing (30) and sleeves the sleeving part; a second sealing surface is formed on the side surface, facing the first sealing surface, of the conductive fixing ring; the second sealing surface is provided with multiple second annular parts (122) arranged radially; shapes of the second annular parts and the first annular parts are complementary; a conductive connection part (162) of a grounding element (16) is connected with the conductive sealing ring or the conductive fixing ring, and the conductive contact part (164) of the grounding element continuously contacts the other one in the conductive sealing ring or the conductive fixing ring. The grounding device can eliminate common mode current. The invention also provides a motor.

Description

technical field [0001] The invention relates to a grounding device, in particular to a grounding device for a drive shaft of a motor. The present invention also relates to an electric machine with the above-mentioned grounding device. Background technique [0002] Existing motors, such as AC motors that feed PMW inverters, may generate common-mode currents between the drive shaft of the motor and the motor casing during operation, and the induced common-mode voltage / current will flow to the motor through the drive shaft bearings, which may cause damage to the motor bearings. [0003] In order to solve the above problems, in the prior art, the grounding device of the drive shaft is used to guide the common mode current to ground, but the existing grounding device may not will fail and may affect the operation of the motor bearings. Contents of the invention [0004] The purpose of the present invention is to provide a grounding device for the drive shaft of a motor, whic...

Claims

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Application Information

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IPC IPC(8): H02K11/40H01R35/00
CPCH01R35/00H02K11/40H01R2201/10
Inventor 李勇王志东徐君
Owner SIEMENS CHINA
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