Armature Winding And Motor Repair Practical Information And Data Covering Windi
Armature Winding And Motor Repair Practical Information And Data Covering Windi
Daniel Harvey Braymer
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(302F. ). This baking is for the purpose of embedding the end of the segments and setting the cement in the rings. Precautions when Tightening a Commutator. It is essen- tial on account of the expansion of the copper, that the commu- tator is not screwed up too tight before it is baked. The best 318 ARMATURE WINDING AND MOTOR REPAIR results are obtained by tightening up the commutator gradu- ally after baking as it cools, giving a final tightening when nearly cold. Many of the troubles met with... in commutators is due to excessive tightening. In arch-bound commutators, it is important that the assembled segments are not tightened too hard in the arch before the V parts are turned, as the result- ing stresses from the expanding copper, distort the parts and often are the main cause of high bars. Similar care should be taken not to exert more pressure than necessary on the end rings and whenever possible means should be provided to measure the pressure. Cases have been known where the angles of the clamp rings in small commutators have been changed by excessive pressure.
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