Repair of a split-phase motor with a damaged
winding consists of several operations: taking the
winding data, stripping the old windings, insulating the
slots, winding the coils and placing them in the slots,
connecting the windings, testing, varnishing and baking
Before the motor is taken apart, the end plates
should be marked with a center punch so that they may
be reassembled properly. One punch mark should be
put on the front end plate and a corresponding mark
made on the frame. Two marks should be made on the
opposite end plate and also on the frame at that point.
Taking the winding data is one of the most
important parts of the operation This action consists of
obtaining and recording information concerning the old
winding; namely, the number of poles, the pitch of the
coil (the number of slots that each coil spans), (fig.
7-31), the number of turns in each coil, the size of the
wire in each winding, the type of connection (series or
parallel), the type of winding, and slot insulation. See
This data is taken while removing the old winding
from the motor frame. One coil should be cut at a place
where the number of turns may be counted. The size of
the wire and other data is then entered on the data sheet.
SPLIT PHASE MOTOR DATA
NO OF POLES
NO OF SLOTS
WINDING (HAND, FORM, AND SKEIN)
NO OF CIRCUITS
Figure 7-32.Split-phase motor data sheet.