Inductive position sensor

Details Inductive position sensor Inductive position sensor

2011-08-23

2011-08-23

Nguyen, Vinh (Department: 2858)

Electricity: measuring and testing

Magnetic

Displacement

Reexamination Certificate

active

08004274

ABSTRACT:
An inductive position sensor, which in particular is a rotational angle sensor, is provided with two first transmitter units for the generation of two site-dependent first alternating fields having the same carrier frequency, and at least one oscillating circuit arranged in or on an element which may be moved within the alternating field and the position of which is to be determined. The oscillating circuit can be energized by the total alternating field and generates a oscillating-circuit alternating field having the same carrier frequency as the first alternating fields. The position sensor is further provided with at least one receiver unit which receives the oscillating-circuit alternating field, and an analysis unit for determining the phase shift between the oscillating-circuit alternating field and at least one of the two first alternating fields, wherein the two first alternating fields may each be generated by a carrier frequency signal on which substantially identical, substantially 90° phase-shifted modulation signals are modulated. Each carrier frequency signal may be generated by application of a square-wave alternating voltage to the first transmitter units, the repetition frequency of said voltage being equal to the carrier frequency. The modulation signal is a pulse density signal having a pulse density changing over time for generation of a signal development having a substantially sine or cosine wave form. The square wave signal is applied to the first transmitter units for the duration of the pulse density signal.

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