DC motor and method of controlling the same

摘要

A DC motor is comprised of an armature winding that includes a first coil group of a plurality of phase coils and a second coil group of a plurality of phase coils, a commutator, a brush unit that includes two pairs of brushes and a motor current supply device. The first and second coil groups are connected in series to a DC power source via the commutator and the two pairs of brushes to be supplied with motor current by the motor current control device. Therefore, voltage applied across the brushes and the commutator is reduced, and arc discharge is suppressed.