Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With rotor
Patent
1987-10-23
1989-03-21
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With rotor
322 99, 324127, G01R 3102, G01R 120
Patent
active
048147001
ABSTRACT:
A rotating machine including a generator having a rotor provided with a field winding, an exciter having an armature, a rotatable steel shaft connected to the generator rotor and the exciter armature, and current conductors enclosed by, and extending axially along, the shaft for conducting a dc generator excitation current from the exciter to the generator rotor field winding, which current creates a magnetic field with the shaft, the machine being provided with a member defining a stationary magnetic field path external to the shaft and magnetically coupled to the shaft for conducting a predetermined portion of the magnetic field created in the shaft, the path being disposed such that during rotation of the shaft, the intensity of the magnetic field in the path varies cyclically; and a magnetic field responsive component magnetically coupled to the path for producing an output signal respresentative of the rate of change of the magnetic field in the path.
REFERENCES:
patent: 3404339 (1968-10-01), Mitchell
patent: 3593123 (1971-07-01), Williamson et al.
patent: 3624504 (1971-11-01), Joly
Karlsen Ernest F.
Westinghouse Electric Corp.
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