EP0110122A1
Expired / Lapsed
EP
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Pick-up for transforming mechanical quantities into electrical quantities
Assignee: Valmet Technologies Oy
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Filing: 1983-10-25
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Granted: —
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Expires: 2003-10-25
Abstract
Abstract A pick-up for transforming mechanical into electrical quantities, to the purpose of observing the position of a moving member e.g. in a tractor. The pick-up converts the position of the member (14) being observed into an electric signal (V out ). The present pick-up is based on using a Hall element (10). The Hall element (10) has been disposed in conjunction with a permanent magnet (11), and the pick-up comprises an electronic unit (20) fixedly accommodated in the pick-up's protective structure (13), in conjunction with said Hall element (10). By the electronic unit, the voltage (V, n ) supplied by the Hall element (10) is amplified to an output voltage (V out ) adequate in level and which is substantially linearly dependent on the distance between the body (14) of ferromagnetic material that is being observed and the Hall element (10). The protective housing of the pick-up is a socket (13) of non-magnetic material such as aluminium or hard plastic, in one end thereof being fitted the permanent magnet (11), on the outer end face (11') of which the Hall element (10) has been applied.
Inventors
- 👤 Hannu Hannukainen
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 16:52
CPC Classifications
G; G01; G01B; G01B7/00; G01B7/003; G01B7/02; G01B7/023; G01D; G01D5/00; G01D5/12; G01D5/14; G01D5/142; G01D5/147
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
161 words
A pick-up for transforming mechanical quantities into electrical quantities, in particular a pick-up intended for observing the position of a movable member in a tractor or equivalent, said pick-up converting the position of the member (14) under observation into an electric signal (V ), and said pick-up being based out on use of a Hall element (10), characterized in that the Hall element (10) has been disposed in conjunction with a permanent magnet (11), the pick-up comprises an electronic unit (20) which has been fixedly accommodated within the protective structure (13) of the pick-up adjacent to said Hall element (10), and by means of said electronic unit (20), the voltage (V in ) delivered by the Hall element (10) is amplified to become the pick-up's output voltage (V ) with high enough level and which is substan- out tially linearly dependent on the distance between the body (14) of ferromagnetic material under observation and the Hall element (10) of the pick-up.
Claim 2
Dependent Claim
161 words
A pick-up for transforming mechanical quantities into electrical quantities, in particular a pick-up intended for observing the position of a movable member in a tractor or equivalent, said pick-up converting the position of the member (14) under observation into an electric signal (V ), and said pick-up being based out on use of a Hall element (10), characterized in that the Hall element (10) has been disposed in conjunction with a permanent magnet (11), the pick-up comprises an electronic unit (20) which has been fixedly accommodated within the protective structure (13) of the pick-up adjacent to said Hall element (10), and by means of said electronic unit (20), the voltage (V in ) delivered by the Hall element (10) is amplified to become the pick-up's output voltage (V ) with high enough level and which is substan- out tially linearly dependent on the distance between the body (14) of ferromagnetic material under observation and the Hall element (10) of the pick-up.
Claim 3
Dependent Claim
111 words
Pick-up according to claim 1, characterized in that the protective housing of the pick-up is a tubular housing (13) of non-magnetic material, such as aluminium or hard plastic, in one end of which the said permanent magnet (11) has been accommodated, that on the outer end face (11') of the permanent magnet (11) has been fitted the said Hall element (10), its connecting leads (a,b,c,d) being connected to said electronic circuit board (20), and that from the electronic circuit board (20) departs the pick-up lead ( 17 ), through which the pick-up's output voltage ( V out ) is taken out and the operating voltage of the pick-up is fed in.
Claim 4
Dependent Claim
142 words
Pick-up according to claim 1 or 2, characterized in that said permanent magnet is a substantially cylindrical permanent magnet body (11), the substantially planar end faces (11') of this permanent magnet being the S and N poles of the permanent magnet, that said permanent magnet (11) has been placed in one end of the respective cylindrical protective tube (13), that said Hall element (10) has been affixed in insulated manner on the planar outer end face (11') of the permanent magnet (11), that the body (14) of which the position shall be observed has been disposed adjacent to said face (11') at an appropriate small distance (d), and that the direction in which moves the ferromagnetic body (14) of which the position is to be observed is substantially parallel to the cylinder axis of said protective tube (13) and permanent magnet (11).
Claim 5
Dependent Claim
36 words
Pick-up according to any one of claims 1-3, characterized in that the electronic unit (20) provided in conjunction with the pick-up comprises an amplifier circuit with at least two amplifier stages (21,22) following after each other.
Claim 6
Dependent Claim
29 words
Pick-up according to claim 4, characterized in that of said amplifier stages the first (21), which is preferably an operational amplifier, has been connected to be a differential amplifier.
Claim 7
Dependent Claim
32 words
Pick-up according to any one of claims 1-5, characterized in that the voltage gain (V /V ) of said amplifier circuit (21,22) out in is on the order of 30 to 45.
Claim 8
Dependent Claim
42 words
Pick-up according to any one of claims 1-6, characterized in that the distance (d) from the Hall element (10) of said body (14) of ferromagnetic material of which the distance is being observed is in the range d ≈0.5 to 6 mm.
Claim 9
Dependent Claim
32 words
Pick-up according to any one of claims 1-8, characterized in that the output voltage (V ) of said pick-up is on the order of out V out ≈ 1 to 10 V.
References Cited (Backward Citations)
CH447629A
Cited
DE2025317A1
Cited
CH557018A
Cited
FR2346679A1
Cited
DE2702641A1
Cited
DE2825214A1
Cited
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