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Transactions Volume 6-7

Transactions Volume 6-7


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About the Book

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1900 Excerpt: ...machine on the works is a 50 H.P. slowspeed motor, of a stationary type, and is at present used to generate current for the mines and smaller motors. Its probable ultimate use will be the driving of the whole of the Company's engineering shop. Controllers--With stationary motors, the use of an automatic device to protect them against the results of cessation in the supply of current or excessive load, is essential. In the first case, damage would result to the machine if left on the circuit when the supply was re-started; consequently a device which will automatically disconnect the motor from the circuit when supply fails, must be provided. The motor starters at Mount Morgan are provided with both these devices. In starting a motor, it is usual to put a resistance in series with the armature, which prevents too sudden a rush of current and is gradually cut out a little at a time until the motor comes up to speed. The resistance in this case is made up of German silver, and points in the length of it are connected to contact pieces arranged on a circular curve over which a switch arm moves against a strong spring, cutting in or out of the circuit successive lengths of the resistance. At the end of the switch arm is a small catch, which, when the switch arm reaches its limit, engages in a groove in the armature of an electro-magnet energised by the field current of the motor. While the supply is on, this magnet attracts and holds the armature and catch, but on stoppage of the supply, the armature is released and the switch arm flies back to zero. The overload attachment is an electro magnet energised by the armature current of the motor. The armature of this magnet can be regulated at various distances from the pole. When the current through the magnet excee...


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Product Details
  • ISBN-13: 9781130903249
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 122
  • Spine Width: 7 mm
  • Width: 189 mm
  • ISBN-10: 1130903249
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 231 gr


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