Inductive speed detector
View Patent ↗A device for inductive speed detection includes two planar coils which are arranged offset at a given distance from a pulse wheel and in the rotational direction of the pulse wheel, and are each part of an oscillator, the oscillator frequency of which is evaluated.
1. A device for inductively detecting speed and rotational direction, comprising:
a pulse wheel; and
two planar flat coils being spatially offset and partially overlapping from one another in a rotational direction of said pulse wheel, and being positioned, respectively, at different given distances from said pulse wheel in a radial direction of said pulse wheel, each of said two planar flat coils serving as a part of a respective oscillator, an oscillator frequency of which is subject to evaluation, wherein for each one of the two planar coils, respective planes of said two planar coils have a normal direction perpendicular to said rotational direction of the pulse wheel.
2. A device according to claim 1 , wherein said pulse wheel is not a magnetic actuator.
3. A device according to claim 1 or 2 , wherein said pulse wheel is constructed periodically in a manner of a lattice.
4. A device according to claim 1 or 2 , wherein said pulse wheel resembles a toothed wheel.
5. A device according to claim 1 or 2 , wherein said pulse wheel is exchangeable.
6. A device according to claim 1 or 2 , wherein said given distance between said planar coils and said pulse wheel is up to about 10 mm.
7. A device according to claim 1 , wherein said planar coils are printed using multilayer engineering.
8. A device according to claim 1 or 2 , wherein said planar coils include punched or bent wire.
9. A device according to claim 1 or 2 , wherein the oscillation frequencies of said oscillators are in the range of a base frequency of about 20 MHz to about 400 MHz.
10. A device according to claim 1 or 2 , wherein said planar coils are switched to said oscillator via a multiplexer.
11. A device for inductively detecting speed and rotational direction, comprising:
a pulse wheel rotatable in said rotational direction, said pulse wheel being coded for enabling said rotational direction detection; and
at least one planar flat coil being arranged at a given distance from said pulse wheel, said planar flat coil serving as a part of an oscillator, an oscillator frequency of which is subject to evaluation, wherein a direction normal to a plane of said at least one planar coil is perpendicular to said rotational direction of the pulse wheel.
12. A device according to claim 11 , wherein said pulse wheel is not a magnetic actuator but rather is electrically conductive and comprises distinct pulse causing segments arranged along a circumference of the pulse wheel.
13. A device according to claim 11 or 12 , wherein said pulse wheel is constructed periodically in a manner of a lattice.
14. A device according to claim 11 or 12 , wherein said pulse wheel resembles a toothed wheel.
15. A device according to claim 11 or 12 , wherein said pulse wheel is exchangeable.
16. A device according to claim 11 or 12 , wherein said given distance between said planar coil and said pulse wheel is up to about 10 mm.
17. A device according to claim 11 or 12 , wherein said planar coil is printed on a printed circuit board.
18. A device according to claim 11 or 12 , wherein said planar coil is punched or bent wire.
19. A device according to claim 11 or 12 , wherein the oscillation frequency of said oscillator is in the range of a base frequency of about 20 to about 400 MHz.
20. A device for inductively detecting speed and rotational direction, comprising:
a pulse wheel; and
two planar flat coils formed on a multilayer printed circuit board and being spatially offset and partially overlapping from one another in a rotational direction of said pulse wheel, and being positioned, respectively, at different given distances from said pulse wheel in a radial direction of said pulse wheel, each of said two planar flat coils serving as a part of a respective oscillator, an oscillator frequency of which is subject to evaluation.