The practical application of dynamo electric machinery by MacFadden Carl K

Author:MacFadden, Carl K. [from old catalog] & Ray, William D., [from old catalog] joint author
Language: eng
Format: epub, pdf
Tags: Electrical engineering, Electric machinery
Publisher: Chicago, Laird & Lee
Published: 1895-03-25T05:00:00+00:00

TROUBLE IN DYNAMOS.

93

In case of trouble with armature ', first take a ' Magneto' ' described in previous chapter, which should be part of the equipment of every electric light plant, and find whether the windings of the armature are connected in any way to the core of the armature. This is easily done by connecting one terminal to the commutator segments and the other one to the shaft of the armature. If it is possible to get a ring, you may be sure that something is wrong in the insulation of either the commutator or armature, if the trouble has made itself known by a violent flashing at the brushes, and on examination it is found that the fault is not in the brushes themselves and that one or more commutator segments are badly burnt, it may be inferred that the armature coils connected to the segments are out of order. In event of a short circuited armature coil, the particular coil will usually be found to be hotter than its neighbor or even burnt, or in case ol an open circuit, the armature will refuse to generate at all. If there is simply a bad contact at the commutator or m the coil itself, there will be considerable local heating at the point of bad contact, which will usually be at the point the armature coil is joined to the commutator lugs. In case of an armature that has been heavily overloaded, it may be found thit the solder in the lug connections at the commutator, has melted and thus short circuited the coils, in this case clean out all the loose solder and removes all solder that make connections between commutator segments, so as to short circuit them. Ring armatures are much easier to locate trouble on than drum armatures, but it is hardly advisable for anyone but on experienced man to take any armature and try to repair burnt out coils.

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