Electricity: motor control systems – Closed loop speed control system for dc motor with commutator – Armature control by digital or combined analog and digital...
Patent
1994-11-14
1997-06-24
Cabeca, John W.
Electricity: motor control systems
Closed loop speed control system for dc motor with commutator
Armature control by digital or combined analog and digital...
318600, 318608, 395 21, 388813, G05B 1940
Patent
active
056424612
ABSTRACT:
A speed control system is disclosed wherein a brushless DC motor and a magneto resistive encoder are able to rotate a motor at arbitrarily low speeds. The motor is able to rotate at low speeds by having a filtered signal generated by an encoder applied to its inputs. The encoder is coupled to a series of filters which remove DC level and harmonic distortions from the resulting encoder signal. These filtered signals are then applied to the motor to control motor rotation speed.
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patent: 5250890 (1993-10-01), Tanamachi et al.
patent: 5297015 (1994-03-01), Miyazaki et al.
patent: 5365158 (1994-11-01), Tanaka et al.
patent: 5424960 (1995-06-01), Watanabe et al.
Cabeca John W.
Seagate Technology Inc.
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