| 摘要 |
<p>A direct current motor (100, 146, 216) for use in a closed-loop control system is disclosed that includes a rotating commutator (154) having a plurality of slots (156, 158, 160, 162, 164), a plurality of windings (166, 168, 170, 172), the number of windings that conduct current corresponding to one less than the number of slots (156, 158, 160, 162, 164) of the commutator (154), and a plurality of brushes (150, 152) that are configured so that application of a direct current voltage across the brushes (150, 152) results in a current flow in at least one of the windings (166, 168, 170, 172) which causes the commutator (154) to rotate. Continuous application of the direct current voltage across the brushes (150, 152) causes the current to flow in a varying number of the current conducting windings (166, 168, 170, 172) as the commutator (154) continues to rotate, the number periodically varying from all of the current conducting windings (166, 168, 170, 172) to the at least one current conducting winding (166, 168, 170, 172). A closed-loop control system is also disclosed that includes a direct current voltage source, a direct current motor (100, 146, 216) including an imbalanced winding and a shaft (106), a motor position signal source (36) that generates a motor position signal for rotating the shaft (106) of the direct current motor (100, 146, 216) to a desired position, and a feedback circuit (214) that corrects for any error in the desired position of the shaft (106) of the direct current motor (100, 146, 216). A printing mechanism (20) having a direct current motor (100, 146, 216) that generates a position feedback signal is additionally disclosed. Further disclosed is are methods (224, 238) of controlling a position of a shaft of a direct current motor in a closed-loop feedback control system (224, 238), the motor having an imbalanced winding. <IMAGE></p> |
