having angularly adjustable excitation field, e.g. by pole reversing or pole switching

Full Title

DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors > characterised by arrangement for exciting > having angularly adjustable excitation field, e.g. by pole reversing or pole switching

Classification Context

Section:

ELECTRICITY

Class:

GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER

Subclass:

DYNAMO-ELECTRIC MACHINES