Download Computer-aided Design of Electrical Machines by Vishnu Murthy, K. M. PDF

By Vishnu Murthy, K. M.

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These are the positions of positive and negative brushes respectively. In case these points of meeting and separating the emfs are at the back of the armature, then brushes may be placed at the front (commutator) at positions opposite to these points. It is also seen that there are two parallel circuits in the winding. 9 Dummy or Idle Coils These are used with Wave windings and resorted to when the requirements of winding are not met by the standard armature punchings available in armature winding shops.

L "Y" phase and is named as "YO", which will be Neutral point of Star connection _ (see Fig. 12). For "B" phase Since "8" phase starts behind 12 slots to "Y" phase, it starts at (13 + 12) = 25 th slot. 49) in 25th slot is to be connected to bottom conductor (no. 14) in slot no. (25 + winding pitch) = (25 + 18) = 43 rd (43 - 36 = i h ). In the same way winding scheme for phase Group-I of "8" phase is completed. Here conductor (24) is beginning and named as "82". Conductor "49" is the ending and named as "81".

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