METHOD FOR INDUCTIVE ENERGY TRANSMISSION

1 - 10 . (canceled)

11 . A method for inductive energy transmission between a primary part and a secondary part, the primary part and the secondary part being parts of a transport system, preferably of a linear motor system, a planar motor system or a magnetic levitation railroad system, the primary part corresponding to a stationary part of the transport system and the secondary part corresponding to a part of the transport system that is movable relative thereto, the secondary part being moved relative to the primary part, a primary electrical current being fed from a supply unit into a transmitting coil arranged on the primary part in order to create a first alternating magnetic field for energy transmission, whereby an electrical AC voltage is induced in a receiving coil arranged on the secondary part, which AC voltage causes an electrical secondary current on the secondary part and thus a power flow comprising an uncompensated active power to at least one load connected to the receiving coil, wherein a secondary-side compensation current is fed into a secondary-side coil by a compensation unit arranged on the secondary part which is moved relative to the primary part, in that a second alternating magnetic field is generated by the secondary-side compensation current in the secondary-side compensation current, which second alternating magnetic field is superimposed on the first alternating magnetic field for energy transmission and induces a primary-side compensation voltage in the transmitting coil, in that a phase shift between the electrical primary voltage dropping across the transmitting coil and the primary current flowing through the transmitting coil is changed by the primary-side compensation voltage induced in the transmitting coil in such a way that a resulting output active power, which is transmitted by the primary part after the change of the phase shift on the at least on load connected to the receiving coil is increased compared to the uncompensated active power without a changed phase shift and in that no primary-side compensation current, which changes the phase shift between the electrical primary voltage dropping across the transmitting coil and the primary current flowing through the transmitting coil and which is provided by an electrical storage element connected in series to the transmitting coil and between the transmitting coil and the supply unit, is fed into the transmitting coil arranged on the primary part.

12 . The method according to claim 11 , wherein the phase shift between the electrical primary voltage dropping across the transmitting coil and the primary current flowing through the transmitting coil is changed only by the primary-side compensation voltage caused by the secondary-side compensation current and induced in the transmitting coil.

13 . The method according to claim 11 , wherein an electrical drive current is introduced into the transmitting coil in addition to the primary current in order to create a first alternating magnetic field by means of which the drive force acting on the secondary part is generated.

14 . The method according to claim 13 , wherein a direct current is introduced into the transmitting coil with the electrical drive current.

15 . The method according to claim 11 , wherein the electrical primary voltage dropping across the transmitting coil and the primary current flowing through the transmitting coil are determined and transmitted to the compensation unit, in that from the transmitted data of primary voltage and primary current, the phase shift between primary voltage and primary current is determined, and in that on the basis of the phase shift between primary voltage and primary current, the secondary-side compensation current is changed in order to bring the phase shift between primary voltage and primary current closer to zero or closer to 180 degrees.

16 . The method according to claim 11 , wherein the secondary-side compensation current fed by the compensation unit into the receiving coil is adapted to changes in the transmission conditions between the transmitting coil and the receiving coil which are caused in particular by aging, temperature influence or wear of the transmitting coil and receiving coil, the supply unit or the at least one load and/or by changes in the relative position between primary part and secondary part.

17 . The method according to claim 11 , wherein the frequency of the primary current, which is fed from the supply unit into the transmitting coil arranged on the primary part is adjusted to conform to an arising resonance frequency of a resonant electrical circuit, which is formed by at least the transmitting coil, the receiving coil, the compensation unit and the at least one load.

18 . A device for inductive energy transmission, comprising a primary part and a secondary part, the primary part and the secondary part being parts of a transport system, preferably a linear motor system, a planar motor system, or a magnetic levitation railroad system, and the primary part corresponding to a stationary part of the transport system and the secondary part corresponding to a part of the transport system that is movable relative thereto, a supply unit being provided on the primary part in order to feed an electrical primary current into a transmitting coil arranged on the primary part in order to create a first alternating magnetic field for energy transmission, a receiving coil and at least one load which can be connected electrically to the receiving coil being arranged on the secondary part, an electrical AC voltage being induced in the receiving coil by the first alternating magnetic field for energy transmission, which AC voltage causes an AC current on the secondary part and thus a power flow comprising an uncompensated active power to the at least one load which can be connected to the receiving coil, wherein at least one compensation unit is arranged on the secondary part, which compensation unit is designed to feed a secondary-side compensation current into a secondary-side coil and thereby generate a second alternating magnetic field which is superimposed on the first alternating magnetic alternating field for energy transmission and which induces a primary-side compensation voltage in the transmitting coil, a phase shift between the primary voltage dropping across the transmitting coil and the primary current flowing through the transmitting coil being changed by the primary-side compensation voltage induced in the transmitting coil such that the resulting output active power, which is transmitted from the primary part, after the change of the phase shift between the primary voltage dropping across the transmitting coil and the primary current flowing through the transmitting coil to the at least one load which can be connected to the receiving coil, is increased compared to the uncompensated active power without a changed phase shift, and in that no electrical storage elements connected in series with the transmitting coil are provided on the primary part between the transmitting coil and the supply unit in order to feed a primary-side compensation current for changing the phase shift between the electrical primary voltage dropping across the transmitting coil and the primary current flowing through the transmitting coil into the transmitting coil.

19 . The device according to claim 18 , wherein the at least one compensation unit comprises at least one electrically variable capacitor, and/or at least one electrically variable coil, and/or an interconnection of at least one electrically variable capacitor and one electrically variable coil.