Electricity: motive power systems – Positional servo systems – With particular motor control system responsive to the...
Patent
1993-10-08
1995-10-24
Shoop, Jr., William M.
Electricity: motive power systems
Positional servo systems
With particular motor control system responsive to the...
318449, 318466, 318468, 318560, G05B 1940
Patent
active
054612942
ABSTRACT:
A device for detecting the stop of a stepping-motor-operated damper for a refrigerator, the damper having a stepping motor, a baffle driven by the stepping motor, a rotation control unit for controlling the direction of rotation and the amount of rotation of the stepping motor. The device includes a memory unit for storing a set value for detecting a position where the baffle is stopped, a measuring unit for measuring an electrical drive signal provided when the baffle is being driven, a comparison unit for comparing the electrical drive signal with the set value, and a stop detecting unit for determining that the baffle has been stopped when the comparison unit determines that the electrical drive signal is larger than the set value, to output a stop signal.
REFERENCES:
patent: 4834283 (1989-05-01), Akabane et al.
patent: 5038087 (1991-08-01), Archer et al.
patent: 5057859 (1991-10-01), Ishimaru
patent: 5204592 (1993-04-01), Huyer
patent: 5210562 (1993-05-01), Miyazawa et al.
patent: 5291114 (1994-03-01), Shirotori et al.
Kabushiki Kaisha Sankyo Seiki Seisakusho
Masih Karen
Shoop Jr. William M.
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