Question

How many coils under an adjoining pole pairs is/are connected between adjacent commutator segments in lap winding?

(a) 1/2

(b) 2

(c) 1

(d) 1/4

I had been asked this question in an internship interview.

Enquiry is from Commutation Process in portion Commutation Process & Excitation Methods of DC Machines

Answer 1

Correct choice is (c) 1

For explanation I would say: No. of parallel paths in a lap winding are equal to P (No. of poles). Thus for 1 pole pir there will be exact 1 coil, connected to adjacent commutator segments in lap winding. In wave winding there will be half coils connected between adjacent commutator segments.