Motor, commutator, short-circuit member, and a method for manufacturing the commutator

A motor comprising:

• a stator having a plurality of circumferentially arranged permanent magnets;
• an electricity supply brush for supplying electricity;
• and
• an armature rotatably arranged inside of the stator, the armature including a plurality of armature coils and a commutator,
• wherein the commutator includes:
• circumferentially arranged segments, the number of the segments being a multiple of the number of the armature coils, wherein the segments include a plurality of pairs of segments, the segments in each pair being adjacent to each other in the circumferential direction, wherein each segment in each pair is connected to one of the ends of corresponding one of the armature coils;
• short-circuit conductors, the number of which is the same as the number of the armature coils, each short-circuit conductor short-circuiting segments that are at the same potential to each other;
• and
• a surge absorbing element, the resistance of the surge absorbing element varying so as to reduce spark discharge generated between the segments and the electricity supply brush, wherein each short-circuit conductor is connected, either directly or via corresponding one of the segments, to the surge absorbing element, so that the surge absorbing element is electrically interposed between the ends of each armature coil.