Electricity: motive power systems – Reciprocating or oscillating motor – Energizing winding circuit control
Patent
1985-11-29
1987-05-05
Duggan, Donovan F.
Electricity: motive power systems
Reciprocating or oscillating motor
Energizing winding circuit control
318132, 310 29, H02K 3302
Patent
active
046635742
ABSTRACT:
A method of and apparatus for measuring the vibration amplitude of an electromagnetic vibratory motor is disclosed in which the current induced in the coils of the motor is sensed and differentiated and applied to dividing means where it is divided by the sensed induced voltage induced in the coils to produce a signal proportional to the instantaneous reluctance of the coils of the vibratory motor. The instantaneous reluctance signal is filtered to remove the line frequency harmonic therein, and this filtered signal is peak detected to produce the vibration amplitude signal. Means are also provided to eliminate the problem associated with the dividing means if the sensed induced voltage approaches zero.
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Dresser Industries Inc.
Duggan Donovan F.
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