Motor provided with potential equilibrium device

Abstract

The invention relates to a motor provided with a potential equilibrium device. The motor is provided with a stator (6) and a rotor (7). A rotor winding (14) of the rotor is electrified by electric brushes (16, 17) movably supported on an electric brush rack (5). The motor is further provided with a potential equilibrium device acting between a rotor shaft (8) and a motor grounding part and having at least one sliding contact element (19). On the one hand, the sliding contact element utilizes a contact surface (22) to attach against the contact body connected with the rotor shaft (8). On the other hand, the sliding contact element is connected with the motor grounding part in a conductive mode. A sliding contact element (19) of the potential equilibrium device is integrated in the electric brush rack (5) and utilizes the contact surface (22) of the electric brush rack to attach against a steering sensor (23) capable of rotating with the rotor shaft (8) and installed in the rotor shaft (8) and to a conductive sliding surface (35) connected with potential of the rotor shaft (8).

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...

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

Images