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Motors with potential equalization

A technology of balancing device and potential, applied in electromechanical devices, connection with grounding devices, synchronous machines, etc., can solve problems such as damage, reduce bearing service life, hinder the trouble-free performance of electrical equipment, and achieve the effect of small wear and space saving

Active Publication Date: 2018-10-16
ROBERT BOSCH GMBH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Here, spark erosion can occur in the region of the bearing surface, which can lead to damage to the bearing
This type of self-discharging through the bearings of the rotor can occur in the form of a pulsed current flow in particular when the insulating effect of the bearing grease fails, whereby the continuous load on the bearing damages the bearing and significantly reduces the service life of the bearing life
[0007] In addition, the pulsed discharge of the charge carriers located on the rotor shaft leads to the generation of electromagnetic waves, which adversely affects the electromagnetic compatibility of the product
In particular, this may prevent the trouble-free performance of electrical equipment located nearby

Method used

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  • Motors with potential equalization
  • Motors with potential equalization
  • Motors with potential equalization

Examples

Experimental program
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Embodiment Construction

[0030] exist figure 1 A view of an electric machine 1 is shown in , the electric machine part 2 of which comprises a stator and a rotor located in the stator. The belt pulley 3 is mounted on the drive side on the rotor shaft via which torque can be transmitted by means of a drive belt (not shown here). On the side of the electric machine 1 opposite the belt pulley 3 , the electrical system for controlling the electric machine 1 is located in the housing part 4 . In addition, in figure 1 The position of the brush holder 5 can be seen in .

[0031] exist figure 2 The structure of the electric machine 1 can be seen in more detail in the longitudinal section of . The electric machine part 2 essentially comprises a stator 6 and a rotor 7 , the rotor shaft 8 of which is rotatably mounted by means of a drive-side ball bearing 9 and an oppositely arranged ball bearing 10 . Bearing shields 11 , 12 are parts of the motor housing and serve as receptacles for ball bearings 9 , 10 . ...

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PUM

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Abstract

The invention relates to an electric machine with a potential equalization device, the electric machine has: a stator (6) and a rotor (7), the rotor winding (14) of which is carried by brushes ( 16, 17) energization; and a potential equalization device acting between the rotor shaft (8) and the motor ground and having at least one sliding contact element (19) which on the one hand utilizes the contact surface (22 ) rests against the contact body connected to the rotor shaft (8) and on the other hand is electrically conductively connected to the motor ground, wherein the sliding contact element (19) of the potential equalization device is integrated in the brush holder (5) And use the contact surface (22) of the brush holder to abut against the potential phase of the rotation angle sensor (23) that is installed at the rotor shaft (8) and rotates with the rotor shaft (8) The conductive sliding surface (35) of the connection.

Description

technical field [0001] The invention relates to an electrical machine with a potential equalization device according to the preamble of claim 1 . Background technique [0002] In various fields of application, electric machines are used as drives and generators. Furthermore, electric motors are used in motor vehicles in so-called regenerative systems, in which the electric motor not only assumes the drive function but also the energy recovery function. [0003] Electric machines with a stator and a rotor, which can be excited externally or self-excited, can each be equipped with a rotational angle sensor which is fixedly connected to the rotor and whose task is to transmit the angular position of the rotor to the control of the electric machine. [0004] It is known that during operation of an electrical machine, a shaft voltage (Wellenspannung) can develop on the rotor shaft, which represents a voltage difference with respect to the electrical machine ground (Maschinenmass...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K11/00H02K11/40H02K13/00H02K5/14H02K11/215
CPCH02K5/14H02K11/0094H02K13/00H02K19/365H02K5/141H02K13/003
Inventor I·德安克B·施罗德M·亨格
Owner ROBERT BOSCH GMBH