Device for recognizing ferromagnetic foreign bodies, in particul

Details Device for recognizing ferromagnetic foreign bodies, in particul Device for recognizing ferromagnetic foreign bodies, in particul

1992-12-10

1994-09-06

Melius, Terry Lee

Harvesters

Motorized harvester

With condition-responsive operation

460 2, A01D 7518

Patent

active

053436768

ABSTRACT:
In a device for recognizing ferromagnetic foreign bodies, for protecting the working members of a harvesting machine, having a magnetic field generating device (9), the lines of flux of which run transversely to the direction of transport, and having assigned pick-up coils (15; 16; 17), it is intended to improve the recognition range across the entire width of the feed system, whilst keeping costs low. At the same time, it is intended better to suppress disturbance signals. For this purpose, the magnetic field generating device (9) comprises an odd number of magnetic poles (12; 13; 14), the two outer magnetic poles (13; 14) possessing the same polarity. At least every second magnetic pole (12) is enclosed by a pick-up coil (15). Expediently, three magnetic poles (12; 13; 14) are present, which are all enclosed by a pick-up coil (15; 16; 17) each. The pick-up coils (15; 16; 17) are connected up such that the induced voltages are added together.

REFERENCES:
patent: 3972156 (1976-07-01), Bennett, Jr. et al.
patent: 4290255 (1981-09-01), Martenas
patent: 4433528 (1984-02-01), Bohman
patent: 4758788 (1983-07-01), Weiss et al.
patent: 5078645 (1992-01-01), Bohman et al.
patent: 5092818 (1992-03-01), Bohman et al.
Agrartechnik International--Apr. 1983; W. Gauggel: "Wie funktioniert der Metalldetektor?".

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