Page 223 - CITS - Electrician - Trade Practical

ELECTRICIAN - CITS

5 Identify one slot and mark a dot each on the side of slot with the help of a centre punch. (Fig 6)

6 Trace the end connection from the slot to the commutator segment.
7 Mark one dot on the lightly ends of the identified commutator segment by using a centre punch. (Fig 6)

Fig 7 shows the lead swing as found in the mixer taken as the example

8 Record the findings in Table. 1
9 Cut the armature leads from the commutator raisers. 10 Apply a thinner to the armature slots and winding.

11 Remove the fibre/Hylam wedges from the armature slots (Fig 8).

12 Count the coil pitch and record it in Table. 1
13 Remove the armature coil one by one from the solts
14 Count the number of turns, size of winding wires weight of each coil, weight of whole winding and type of slot
insulation. Record them in Table 1.
15 Practice the exercise for three or four times with different armature assemblies.
16 Keep all the parts safely for using at the next exercise

206

CITS : Power - Electrician & Wireman - Exercise 88