Means and method of sensing motor rotation speed from stray esca

Details Means and method of sensing motor rotation speed from stray esca Means and method of sensing motor rotation speed from stray esca

1981-11-06

1985-01-22

Truhe, J. V.

Electricity: motive power systems

Plural, diverse or diversely controlled electric motors

Plural, diverse motor controls

318316, 310 68B, 324158MG, H02P 516

Patent

active

044954484

ABSTRACT:
For isolating dynamic rotational signal components from a dominating line frequency component in the stray magnetic fields escaping from the motor, a pick-up probe for instrumentation analyzing the motor characteristics is provided with a feedback winding and feedback circuit resonant therewith over a band including a harmonic of the normal motor rotational speed, i.e. full rated load speed. Thus, sensing of a-c induction motor conditions can occur with a single uncritically spaced external probe that needs no motor mechanical, photo or electrical additions or modifications. No access need be had to rotating motor shafts or driven mechanisms.
Thus for the first time instrumentation is made independent of installation of accessories by skilled technicians in existing locations for monitoring motor characteristics. Nor are special motors with special wiring, coils, rotating elements or accessories necessary to couple monitors.
Appropriate circuit analyzers determine from derived pulses representative of dynamic instantaneous rotation speed of the motor, such characteristics as slip, r.p.m., load, etc.

REFERENCES:
patent: 422885 (1890-03-01), Hoyt
patent: 1905216 (1933-04-01), Capps
patent: 4025832 (1977-05-01), Jones
patent: 4082968 (1978-04-01), Jones
patent: 4176305 (1979-11-01), Cuno
patent: 4329636 (1982-05-01), Ushida et al.
patent: 4359676 (1982-11-01), Fujioka

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