| CPC H02J 50/90 (2016.02) [G01B 7/14 (2013.01); H02J 50/12 (2016.02); H02J 50/80 (2016.02)] | 15 Claims |
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1. A method for contactless power transmission between a stationary part and a movable part, with an electrical power supply circuit comprising an air-coupled transformer provided with a primary resonant circuit with a primary coil supported by the stationary part and a secondary resonant circuit with a secondary coil facing the primary resonant circuit and supported by the movable part;
the method comprising the steps of
feeding the primary resonant circuit with a primary alternating electrical voltage causing a primary electrical current to circulate, said primary electrical current inducing in the secondary resonant circuit a secondary alternating electrical voltage that causes a secondary electrical current to circulate;
adjusting at least one electrical variable influencing the achievement of a resonance condition wherein the primary electrical voltage is in phase with the primary electrical current; and
monitoring the distance (d) between the stationary part and the movable part,
wherein the step of monitoring the distance between the stationary part and the movable part comprises:
detecting a value of said at least one electrical variable influencing the achievement of the resonance condition; and
determining said distance between the stationary part and the movable part as a function of the value of said at least one electrical variable.
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