A new convertor for the speed control of a.c. slipring induction motors has been developed by the Swedish-based firm ASEA. The YQTH convertor is primarily intended for applications where it is necessary to run motors at low speeds for brief intervals. Crane, winch and hoist drives are typical examples. ASEA says it is possible to control slipring motors with rated currents up to 700 A (equivalent motor output 400 kW at 300 V) with the YQTH convertor. The convertor is designed to operate in harsh environmentals where, for example, moisture, wide temperature variations and vibration may occur. Protective features built into the drive system include thermal protection and loss-of-torque protection.

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  • Corporate Authors:

    IPC Industrial Press Limited

    Dorset House, Stamford Street
    London SE1 9LU,   England 
  • Publication Date: 1979-1

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Filing Info

  • Accession Number: 00189913
  • Record Type: Publication
  • Source Agency: IPC Industrial Press Limited
  • Files: TRIS
  • Created Date: Apr 25 1979 12:00AM