Electricity: motive power systems – Limitation of motor load – current – torque or force
Patent
1997-01-31
1999-02-09
Shoop, Jr., William M.
Electricity: motive power systems
Limitation of motor load, current, torque or force
318138, 318439, 318734, 318735, H02P 100
Patent
active
058699392
ABSTRACT:
A direct current motor for use in a closed-loop control system is disclosed that includes a rotating commutator having a plurality of slots, a plurality of windings, the number of windings that conduct current corresponding to one less than the number of slots of the commutator, and a plurality of brushes that are configured so that application of a direct current voltage across the brushes results in a current flow in at least one of the windings which causes the commutator to rotate. Continuous application of the direct current voltage across the brushes causes the current to flow in a varying number of the current conducting windings as the commutator continues to rotate, the number periodically varying from all of the current conducting windings to the at least one current conducting winding.
A closed-loop control system is also disclosed that includes a direct current voltage source, a direct current motor including an imbalanced winding and a shaft, a motor position signal source that generates a motor position signal for rotating the shaft of the direct current motor to a desired position, and a feedback circuit that corrects for any error in the desired position of the shaft of the direct current motor.
A printing mechanism having a direct current motor that generates a position feedback signal is additionally disclosed.
Further disclosed is are methods of controlling a position of a shaft of a direct current motor in a closed-loop feedback control system, the motor having an imbalanced winding.
REFERENCES:
patent: 5428276 (1995-06-01), Carobolante et al.
patent: 5442272 (1995-08-01), Schwartz
patent: 5703456 (1997-12-01), Cox
Anderson Erik A.
Hewlett--Packard Company
Lockett Kim
Shoop Jr. William M.
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