Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With rotor
Patent
1981-01-12
1985-03-19
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With rotor
324117H, 340648, 361 23, G01R 3102, G08B 2100
Patent
active
045062188
ABSTRACT:
An arrangement for sensing the operating condition of an alternating current machine employs a Hall switch on the stator which is subjected to the alternating magnetic field established during operation. The Hall switch has a magnetic field strength threshhold below which it will not be actuated. During normal operation of the machine, the alternating field strength will cyclically exceed the switch threshhold, thereby generating a series of pulses at the frequency of alternation of the field. Should the field strength decrease as a result of overload of the machine, a decrease in line voltage, or the like, to a level below the threshhold level of the switch, the pulse output of the switch will cease. Circuitry responsive to the absence of periodic pulses actuates an indicator circuit to warn of the faulty operation.
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Sprague Interim Bulletin, "Type UGN-3013T Solid-State Ultra Low-Cost Hall Effect Digital Switches", Oct. 2, 1978.
Brown Fred A.
Grouse Alan F.
Karlsen Ernest F.
Rotron Incorporated
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