IEE Colloquium on High Speed Bearings for Electrical Machines

25-25 April 1995

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  • IEE Colloquium on High Speed Bearings for Electrical Machines (Digest No.1997/164)

    Publication Year: 1997
    IEEE is not the copyright holder of this material | PDF file iconPDF (58 KB)
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  • Electrical machines fitted with glacier magnetic bearings

    Publication Year: 1997, Page(s):1/1 - 1/6
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (398 KB)

    Active magnetic bearings using the principal of controlled DC electromagnetic suspension have been available to machinery designers for over 20 years. The maturation of this technology has coincided with a trend towards higher speed and wider operating envelopes on many classes of machine. The combination of these two factors has resulted in the acceptance of their use within a wide range of high ... View full abstract»

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  • High speed fans

    Publication Year: 1997, Page(s):2/1 - 210
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (574 KB)

    The high-speed motor has already seen a number of diverse applications and has brought with it significant advantages for the mechanical design engineer. As related in this paper, new closed-system fan applications are being addressed as the technology of high-speed motors and their bearing systems develop. View full abstract»

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  • Gearing for high speed motors

    Publication Year: 1997, Page(s):3/1 - 313
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (573 KB)

    In industry, machinery operates at greatly different speeds. A large cement mill or steel converter runs at fractions of a revolution per minute, while centrifugal compressors operate at 5000 to 20,000 RPM. In between these extremes comes the large majority of machines running at 10 to 1000 RPM. The absorbed powers vary as widely, from fractions of a kilowatt to many megawatts in large conveyors a... View full abstract»

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  • Magnetic bearings for high speed turbo molecular pumps

    Publication Year: 1997, Page(s):4/1 - 4/6
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (355 KB)

    A turbo molecular pump (TMP) is a multi-stage axial-flow turbine in which high-speed rotating blades work against similar static blades to provide compression by momentum transfer to the gas molecules. The TMP is optimised for molecular flow conditions and requires a backing pump to exhaust to atmosphere achieving ultimate vacuums up to 10/sup -10/ millibars. Turbine speeds of 30,000 to 100,000 RP... View full abstract»

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  • The pursuit of higher rotational speeds; developments in bearing design and materials

    Publication Year: 1997, Page(s):5/1 - 5/5
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (305 KB)

    The advance in electric motors has been characterised by a trend towards even higher speed and accuracy. Such demands can no longer be satisfied by bearings of standard design, accuracy or materials. Speedability in ball bearings is generally limited by the hertzian contact stress levels between the ball and raceway and heat generation of the bearing components. By selective design and material co... View full abstract»

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  • Integrated machinery systems for cryogenic processes consisting of turboexpander, compressor, high-frequency motor and generator with magnetic bearings

    Publication Year: 1997, Page(s):6/1 - 612
    Cited by:  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (734 KB)

    The coupling of the power of a turboexpander/compressor unit has a reciprocally negative effect on efficiency, when process conditions deviate from the nominal conditions and, as a consequence, the speed of the unit is variable. The advantage of constant speed, independent of the power scale, can be achieved for conventional designs using coupled systems of turboexpander and compressor by integrat... View full abstract»

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  • Active magnetic bearing requirements for turbomachinery

    Publication Year: 1997, Page(s):7/1 - 7/9
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (527 KB)

    Rolls Royce (RR) have been interested in the application of active magnetic bearings (AMBs) for a number of years and have carried out two demonstrator programmes and a number of design studies. The generic benefits of AMBs to a range of machinery are summarised. The authors discuss the technology demonstrators, the design requirements, robust control, hardware redundancy, digital controller, soft... View full abstract»

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