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2 Principles of d.c. machines
D.C. machines are the electro mechanical energy converters which work from a d.c.
source and generate mechanical power or convert mechanical power into a d.c. power. These
machines can be broadly classified into two types, on the basis of their magnetic structure.
They are,
1. Homopolar machines
2. Heteropolar machines.
These are discussed in sequence below.
2.1 Homopolar machines