Patent ID: 11898887
Assignee: MICROCHIP TECHNOLOGY INCORPORATED
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 21:
22. An apparatus comprising:
a rotational-position sensor to sense a signal that exhibits amplitude modulation as a target rotates around an axis of rotation above a sense coil;
the sense coil defining a continuous path for electrical current to flow between a first location and a second location, the continuous path comprising:
a first path portion defined as a generally clockwise path for the electrical current to flow around the axis;
a second path portion defined as a generally counter-clockwise path for the electrical current to flow around the axis;
the first path portion and the second path portion together defining at least a first lobe and a second lobe, the second lobe adjacent and meeting with the first lobe at an inter-lobe region; and
the inter-lobe region having a radial-direction-reversal region at which one of the first path portion or the second path portion changes from a generally outward path along a portion of the first lobe for the electrical current to flow away from the axis to a generally inward path along a portion of the second lobe for the electrical current to flow toward the axis in the same one of the generally clockwise path or the generally counter-clockwise path,

the amplitude modulation comprising two sinusoidal cycles per target rotation, the amplitude modulation exhibiting a 180°-phase shift responsive to the target rotating over the radial-direction-reversal region of the sense coil.