Measuring of electrical currents, voltage and resistance of an axial bearing
- Resource Type
- Conference
- Authors
- Safdarzadeh, Omid; Weicker, Martin; Binder, Andreas
- Source
- 2021 International Aegean Conference on Electrical Machines and Power Electronics (ACEMP) & 2021 International Conference on Optimization of Electrical and Electronic Equipment (OPTIM) Electrical Machines and Power Electronics (ACEMP) & 2021 International Conference on Optimization of Electrical and Electronic Equipment (OPTIM), 2021 International Aegean Conference on. :376-382 Sep, 2021
- Subject
- Communication, Networking and Broadcast Technologies
Components, Circuits, Devices and Systems
Computing and Processing
Engineered Materials, Dielectrics and Plasmas
Engineering Profession
Fields, Waves and Electromagnetics
Photonics and Electrooptics
Power, Energy and Industry Applications
Robotics and Control Systems
Signal Processing and Analysis
Resistance
Temperature measurement
Voltage measurement
Force measurement
Current measurement
Surface resistance
Force
Electric vehicles
electrical machines
rotor-to-ground current
bearing surface
bearing current
wearing
thermal damage
- Language
Bearing currents induced in electrical motors driven with fast switching power electronic inverters lead to bearing surface damages on the raceway. This may be the case especially when the rotor is electrically connected to the earth potential of the system e.g. via the cogging wheels of a coupled gear. In this paper an axial bearing type 51208 is investigated at standstill and in rotation concerning the bearing resistance. The a-spot situations are estimated in standstill based on the measured signals. In rotation the bearing resistance is measured for a range of operating speeds from 0 rpm to 3000 rpm, a range of bearing currents from 0.5 A to 3 A, and two axial forces 180 N (rated condition), 800 N. A special test rig is designed to measure the bearing voltage and current signals without using mechanical brushes in the rotating system to eliminate the contact resistance of the brushes in the measured bearing signals. The results allow to predict the bearing electrical behavior at a bearing current flow through the ground.