Direct current motor

A direct current motor comprising:

• a field magnet provided with 2n magnetic poles which are magnetized with the same angular intervals as those of the magnetic poles N and S, where n is an integer of 1 or more;
• a magnetic member for closing the magnetic circuit of said magnetic poles of said field magnet;
• a plurality of armature coils disposed in such a manner that the angular intervals of the electrically conductive portions thereof, contributing to the generation of torque in said armature coils, are substantially equal to the magnetic pole width of said field magnet;
• electric power supply control means to which the terminals of said armature coils are connected;
• short-circuit means for short-circuiting the winding intiation terminals of predetermined armature coils directly to other of said terminals, in which at least one terminal is not shorted to any other, and the winding end terminals of other predetermined armature coils through said electric power supply control means;
• an armature comprising armature coils in a first series and armature coils in a second series, through which said short-circuit means and said plurality of armature coils are connected in parallel to the positive pole and negative pole of a DC power source, said armature positioned so as to face said field magnet;
• and
• a rotating shaft for rotatably supporting said armature or said field magnet as a rotor, said rotating shaft rotatably supported by bearings disposed on an outer casing of said direct current motor.