US 12,235,137 B2
Position detection by an inductive position sensor
Florian Höller, Eggelsberg (AT); and Roland Reichhartinger, Eggelsberg (AT)
Assigned to B&R INDUSTRIAL AUTOMATION GMBH, Eggelsberg (AT)
Filed by B&R INDUSTRIAL AUTOMATION GMBH, Eggelsberg (AT)
Filed on Jun. 15, 2022, as Appl. No. 17/841,024.
Claims priority of application No. A 50484/2021 (AT), filed on Jun. 16, 2021.
Prior Publication US 2022/0404174 A1, Dec. 22, 2022
Int. Cl. G01D 5/20 (2006.01); G01B 7/00 (2006.01); H03M 1/48 (2006.01)
CPC G01D 5/2066 (2013.01) [G01B 7/003 (2013.01); H03M 1/485 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A method for determining a position of a moving part relative to a stationary part by an inductive position sensor, wherein an excitation winding is arranged on one of the moving part or the stationary part and at least one secondary winding is arranged on the other of the moving part or the stationary part, the method comprising:
feeding an electrical excitation signal with an excitation frequency and an excitation amplitude into the excitation winding, which generates an electromagnetic excitation field;
detecting a measurement signal induced in the secondary winding by the generated electromagnetic excitation field, wherein the measurement signal includes a superimposed noise signal,
forming a frequency functional which is dependent on the excitation frequency and represents a measure of the superimposed noise signal, and
changing the excitation frequency of the excitation signal so that the frequency functional representing the measure of superimposed noise signal is minimized or maximized and using the changed excitation frequency that minimizes or maximizes the frequency functional representing the measure of superimposed noise signal for the excitation signal,
wherein the position of the moving part of the position sensor is determined from the measurement signal.