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Practical Testing of Electrical Machines

Practical Testing of Electrical Machines


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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. 1921 Excerpt: ...machine under test is separately excited, and rheostats are put in (I) the field of the driving motor, in order to adjust its speed; (2) the field of the machine under test; this rheostat should be sufiicient to vary the field current over a wide range; (3) in case the voltage of the supply circuit is apt to fluctuate, a rheostat should be put in the field of the generator which supplies the power, by means of which the voltage can he held steady whilst taking readings. The following instruments are required for this test: --(I) A direct current ammeter in the armature circuit of driving motor. (2) A direct current ammeter in the field of driving motor. (3) A direct current ammeter in the field of the machine under test. (4) A direct current voltmeter across the brushes of driving motor. (5) A direct current voltmeter across the brushes of the machine under test. Fig. 67 shows the general arrangement. The test is proceeded with as follows. The motor is started and the speed adjusted by means of the rheostat in its field until the machine under test runs at its normal speed. The field circuit of the latter should then be closed and its voltage raised to its proper value; the brushes should then be set at the pdsition on the commutator at which the potential of adjacent bars is equal. This position may be found by taking a low_reading voltmeter, reading up to about 20 volts, and holding the points of the leads from this voltmeter on the ends of the commutator at distance apart about equal to the breadth of one Commutator bar. These points are then moved some bars around the circumference of the commutator on each side of the brushes until the voltmeter reads zero; the brushes are then moved into this position. In most machines this position is under the centre..


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Product Details
  • ISBN-13: 9781236218667
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 46
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 1236218663
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 100 gr

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