Patent ID: 8129865

Claim:
An inductive rotary joint for non-contact transmission of electrical energy between a stationary part and a rotating part of the rotary joint, comprising: a power generator disposed on the stationary part for generating an alternating voltage or an alternating current; an inductive power transmitter comprising a primary side disposed on the stationary part and a secondary side disposed on the rotating part, in which the primary side is fed by the power generator and the secondary side feeds a load; a measurement means disposed on the stationary part and operationally coupled between the power generator and the primary side of the inductive power transmitter for determining at least one electrical parameter selected from a group comprising: a voltage, a current, and a phase angle of electrical energy fed by the power generator into the primary side of the power transmitter; and a unit disposed on the stationary part and operationally coupled between the measurement means and the power generator for controlling the power generator with the aid of the at least one measured electrical parameter, so that at least one other electrical parameter on the load is maintained approximately constant, wherein the at least one other electrical parameter is selected from a group comprising a voltage, a current, and a phase angle of the electrical energy fed onto the load, and wherein the unit comprises a computer readable medium with a model for simulating a relationship between the at least one other electrical parameter on the load and the at least one electrical parameter on the primary side of the power transmitter.