By M. B. Shah
The second one version of Engineering Drawing maintains to hide the entire primary themes of the sector. This version features a new bankruptcy on scales, the newest model of AutoCAD, and new pedagogy. Combining technical accuracy with readable explana
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Extra resources for Engineering Drawing
There must be no shorts between any coil or coils. 5. The joints at the commutator must be sound. The Earth Test The earth test is quite normal and needs hardly any explanation. For a 230 V armature an ordinary 500 V Megger earth tester is an obvious choice. But it must be appreciated that if an armature is rated for only 6 V such a test would hardly be warranted, and in these cases a series lamp of 230 V is adequate unless the low-voltage armature concerned comes, for example, from an aircraft machine, in which case the test specifications are much more rigid.
28(c), that is to say, the end of one circuit connects to the beginning of the next. In actual practice the order is quite easily located and the twist up is made for only a short way down the leads, the wires being parallel where they enter the commutator. Fitting the Commutator The commutator is then added. It is necessary to make sure that: 1. The commutator bars are in line with the armature slots according to the data given. 2. The commutator is pressed on to the correct distance. A felt or fibre disc is frequently added between the back of the commutator and the winding.
A skein of 50 turns of fine wire could be used for a particular field coil; four throws of the skein would therefore give 200 turns. Cash-register motors often use the skein wind for their field system. g. timer mechanisms, fans, blowers, roasting-spit revolving mechanisms, etc. Fig. 38 shows a simple shaded-pole motor which uses the same type of field coil as that shown in Fig. 37. The shaded poJe is merely a rectangular ring of heavy-section copper laid in the slots provided in the field stampings.
Engineering Drawing by M. B. Shah