Electricity: motive power systems – Braking – Automatic and/or with time-delay means
Patent
1979-05-14
1981-09-15
Smith, Jr., David
Electricity: motive power systems
Braking
Automatic and/or with time-delay means
318314, 318318, 242 7551, H02P 516
Patent
active
042899990
ABSTRACT:
A control circuit generates a variable analog output voltage in response to momentary closure of touch control means by an operator. The control level selected via the touch control means is sampled, digitized, digitally stored and reconverted to the analog output voltage for driving a motor at a commensurate speed. Selection of a different control level generates a correspondingly different digital value and thus a different analog output voltage. The selected control level and the corresponding analog output voltage may be maintained for an extended period of time until a new selection is made, or a different operating mode is entered. A mode change causes an automatic reset to a neutral operating condition (e.g., zero analog output voltage).
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patent: 4053283 (1977-07-01), Mathewson
Almeida George B.
Ampex Corporation
Clay Robert G.
Smith Jr. David
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