Electricity: motive power systems – Automatic and/or with time-delay means – Motor load – armature or primary or secondary circuit current
Patent
1976-04-19
1977-11-15
Myracle, Jerry W.
Electricity: motive power systems
Automatic and/or with time-delay means
Motor load, armature or primary or secondary circuit current
73133R, 73151, G05B 500
Patent
active
040587576
ABSTRACT:
A system for measuring current or load for shutting down a motor of a walking beam type pumping unit in the event that pump-off occurs. The system employs a peak picker which picks either minimum current or maximum load and an integrator coupled to the peak picker for integrating current or load during each stroke cycle. A threshold device coupled to the output of the integrator produces a control signal for shutting down the motor if the integrator output fails to reach a predetermined threshold during each stroke cycle.
REFERENCES:
patent: 3440512 (1969-04-01), Hubby
patent: 3817094 (1974-06-01), Montgomery et al.
patent: 3953777 (1976-04-01), McKee
Hill Michael E.
Welton Barry S.
Westerman Granval W.
End Devices, Inc.
Myracle Jerry W.
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