Electricity: motive power systems – Plural – diverse or diversely controlled electric motors – Work and feed motors
Patent
1974-05-10
1976-12-28
Schaefer, Robert K.
Electricity: motive power systems
Plural, diverse or diversely controlled electric motors
Work and feed motors
318572, 318653, 318656, 324 34D, 340199, 219 69G, B23Q 510
Patent
active
040004481
ABSTRACT:
A system for sensing the air gap between a cutting tool and a work piece mounted on a machine for the purpose of controlling the traverse feed rate of the machine as contiguity approaches. A drive coil is mounted on the machine. A search coil surrounds the cutting tool in proximity to the air gap and is mutually coupled (M.sub.1) to the drive coil. A mutual inductor has first and second coils arranged so that their mutual inductance M.sub.2 is variable; these coils are connected in common at one end to a variable inductionless resistor r. The first coil is connected series aiding with the drive coil, while the second coil is connected in series opposition with the search coil. An a.c. source is connected across the drive coil, first coil and inductionless resistor. The induced voltage across the series combination of search coil, second coil, and inductionless resistor provides an output which is initially nulled by adjusting M.sub.2 and r for a selected datum displacement between cutting tool and work piece. The change in induced output voltage .DELTA.e varies in accordance with the mutual inductive M.sub.1 which changes as a function of the instantaneous displacement between the cutting tool and the work piece. The induced voltage .DELTA.e is then used to provide an adaptive voltage which serves to vary the traverse feed rate of the machine as required.
REFERENCES:
patent: 2627119 (1953-02-01), Graham
patent: 3206663 (1965-09-01), Neal et al.
patent: 3286160 (1966-11-01), Isoda et al.
patent: 3447419 (1969-06-01), Foster
patent: 3594671 (1971-07-01), Frenkel
patent: 3641849 (1972-02-01), Kinney
patent: 3684961 (1972-08-01), Muir
Miller Robert C.
Shum Lanson Yatsang
Feldhaus John J.
Schaefer Robert K.
Westinghouse Electric Corporation
Wood James J.
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