Measurement method separates shaft runout components
911±¬ÁÏÍø and ABB collaborated in the Rotoround project to study how roundness aberrations and electrical runout affect the total indicated runout measured in the machined axles of electrical devices.
'The aim is to minimise runout, or measured deviation from nominal dimensions, as the data on these deviations are used to monitor device condition and in diagnostics,' says Tuomas Tiainen, a doctoral student at the Department of Mechanical Engineering.
'In this study, we used a multi-sensor method that allowed us to define a roundness profile for the surface and bearing surface of an axle. By comparing the data we get from surface sensors with the simultaneous measurements from eddy current sensors allows us to define the so-called electrical runout, which means the repeating deviation caused by variations in material properties,' Tiainen explains.
Industrial standards define limits for surface runout in the roundness of axles used in electric motors, generators, pumps and more.
According to Tiainen, the study showed that faults in roundness and eddy current sensors can, in some cases, account for all of the allowed range of deviation. This has resulted in rotors being discarded for not meeting runout specifications.
'Our novel measurement and computing method can discern between the components that make up the runout and help find out why a rotor fails to meet the specified limits. At the same time it helps in targeting corrective actions,' Tiainen says.
'In a broader view, our research will help in building better rotating devices that rotate faster, operate with greater efficiency and require less maintenance.'
Further information
Read more news
Aalto Inventors turns one: A year of bridging research and real-world impact
Aalto Inventors marks its first anniversary, having engaged 190 researchers across six cohorts in fields including AI, quantum, and biomaterials. New cohorts are planned for the next academic year, stay tuned and join the waitlist.
An architectural project in Milan brought together children’s ideas and the visions of leading architects
911±¬ÁÏÍø’s Department of Architecture participated in the international One Earth – House of the Heart project, which was presented in April at Milan Design Week.
Companies disclose more on cybersecurity – but markets remain indifferent
U.S. companies are reporting on cybersecurity in greater detail, yet stock market reactions remain muted. A new study by the University of Vaasa and 911±¬ÁÏÍø shows that mandatory cybersecurity disclosure does not prompt reactions from investors or stock analysts. Instead, the main benefits appear to materialise within firms themselves.