Industries and Iron Volume 11

Industries and Iron Volume 11

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1892 edition. Excerpt: speed together without any excessive current or other trouble. This method of starting is applicable to large machines, or macllines whose armature loss b resistance is small. It is, of course, only available w ere the generator and motor can be started at the same time, and is therefore useless in the case of small motors on supply circuits. A multiple current motor will, of course, start from rest in this manner, but a single-current motor may be started nearly as easily, all that is necessary being to rotate it slowly by hand, and as soon as the generator starts it will fall into step with it. As in both cases there must be some power at the receiving station to run the exciter, it may be used to start single-current machines. The method of starting slowly is then applicable to both cases, and roves a simple and safe method of synchronising two arge machines. We are doubtful, therefore, whether the multiple current has any advantages over the single for transmission of large powers to large motors. We have so far taken the old Gramme as a typical multiple-current machine, but we will now describe a machine more worthy to be taken as the type. Our illustrations (F' s. 25 and 26) show a triple-current generator used for t e transmission of 300 h.p. from Laulfen to Frankfort. It has been designed by Mr. C. E. L. Brown, and built by the Oerlikon Works. The field magnet rotates, and has thirty-two poles, which are excited by a single coil of wire. This admits of a. very simple field magnet, and saves copper and loss of power in excitation. The armature is stationary, and has ninety-six conductors. These are imbedded in the iron of the armature, a method that has been employed at Oerlikon for years with great success. The imbedding of more

Product details

  • Paperback | 1076 pages
  • 189 x 246 x 54mm | 1,878g
  • United States
  • English
  • black & white illustrations
  • 1236800001
  • 9781236800008