Abstract A counter, for example a counter-speedometer for automobile vehicles, comprising a motion take-off actuating a signal emitter and a receiving unit comprising a rotary magnet which drives, by the effect of Foucault''s currents, a non-magnetic movable element integral with an index and subjected to the action of a return spring, a rotating field generator driving in synchronism said rotary magnet and supplied with power by said signal emitter, wherein the rotating field generator is constituted by at least one stator winding having at least one core terminating in pole pieces which encompass therebetween the rotary magnet and the non-magnetic element, said non-magnetic element being a disc rotating coaxially with the rotary magnet which is constituted by at least one elementary magnet oriented axially, and said pole pieces being disposed in such manner that the lines of force therebetween are also parallel to said common axis.
A counter responsive to the frequency of a pulsed electrical signal comprising a. a rotating magnet, the field of which is substantially parallel to its axis of rotation; b. a disc of non-magnetic conductive material mounted for spring-returnable rotation coaxial with but mechanically independent of the rotation of the magnet, said disc being disposed in face-to-face relationship with said magnet so as to be urged into rotation by the Foucault currents of the rotating magnet; c. means operable to register rotation of the disc; and d. a rotating field generator energized by said electrical signal and having a plurality of uniformly spaced electromagnetic coils, each of said coils having a core the pole positions of which are so disposed that lines of force therein between when said coil is energized 1. are substantially parallel to the common axis of rotation, and 2. are intersected by the outer peripheries of the rotating magnet and disc.
Claim 2
Dependent Claim
154 words
A counter responsive to the frequency of a pulsed electrical signal comprising a. a rotating magnet, the field of which is substantially parallel to its axis of rotation; b. a disc of non-magnetic conductive material mounted for spring-returnable rotation coaxial with but mechanically independent of the rotation of the magnet, said disc being disposed in face-to-face relationship with said magnet so as to be urged into rotation by the Foucault currents of the rotating magnet; c. means operable to register rotation of the disc; and d. a rotating field generator energized by said electrical signal and having a plurality of uniformly spaced electromagnetic coils, each of said coils having a core the pole positions of which are so disposed that lines of force therein between when said coil is energized 1. are substantially parallel to the common axis of rotation, and 2. are intersected by the outer peripheries of the rotating magnet and disc.
Claim 3
Dependent Claim
12 words
are intersected by the outer peripheries of the rotating magnet and disc.
Claim 4
Dependent Claim
12 words
are intersected by the outer peripheries of the rotating magnet and disc.