Prof. Alan L Harvey
Electronic Magnetic Bearings Principles and Applications
Date : 27th Oct 2015 (Tuesday)
Time : 15:00 – 16:00
Venue : Gallery 2,
Faculty of Engineering, UPM
Alan L. Harvey. PhD, RMIT University. Acupak Pty Ltd
Electronic magnetic bearings use electromagnetic forces to suspend the rotating shaft. They maintain contact free rotation by means of a small annular gap, typically 1 to 1.5 mm from the rotor to the stator of the rotating machine. Position sensors sense the gap and an electronic controller controls a current output to control electromagnetic force motors to control rotor position. Magnetic bearings may be passive or active in nature. Passive bearings are difficult to design and do not have the versatility of magnetic bearings. Electronically controlled magnetic bearings are essential for high speed rotating machinery due to their low losses. Seminar discusses sensor types and characteristics, controller types, analog versus digital and magnetic force motor characteristics. The author worked on a magnetic bearing project for a high speed refrigeration system for some 5 years at the end of which time commercial refrigeration models were sold.
Alan Harvey worked on magnetic bearings for some 5 years at Turbo research in Melbourne. The bearing system was developed for a high speed air conditioning compressor turbine. He is the principal of Acupak a medical equipment co. He worked for BP Australia and BP UK as a Controls and Electronic Engineer. He has a PhD in Computer Vision and an MSc from UMIST UK. His substantive career was at RMIT as a senior lecturer in the School of Computing and Electronic Engineering. He worked in Industry for many years including BP UK, BP Australia and Australian Paper and CMPS. Member of IEEE Victoria holding CAS Chair, Vice Chair positions. Author of some 50 papers in Pattern recognition. He presented the keynote address to ICBEA 2010 a business and Engineering conference in Malaysia. He is the chair for Circuits and Systems in IEEE Victorian section.