An externally excited electric synchronous machine may include a machine rotor, a machine stator, and a signal transmission device for contactless transmission of an operating signal corresponding to a DC voltage to the machine stator. The machine rotor may include a rotor shaft and a machine rotor coil. The machine rotor coil may be supplied with DC voltage and may provide a magnetic rotor field. The machine stator may include a machine stator coil that is fixed relative to the machine stator. The machine stator coil may provide a magnetic stator field, which may interact with the magnetic rotor field such that the machine rotor rotates. The signal transmission device may include (i) on the machine rotor, a signal coil connected in series with the machine rotor coil and (ii) on the machine stator, a magnetic field sensor that detects a magnetic field provided via the signal coil.

An inductively electrically excited synchronous machine is disclosed. The synchronous machine includes a rotor including at least one rotor coil for generating a magnetic rotor field, a stator, on which the rotor is rotatably mounted about an axis of rotation, and including at least one stator coil for generating a magnetic stator field, and a rotary transformer for inductively transmitting electrical energy to the at least one rotor coil. The rotary transforming includes at least one stator-fixed transformer primary coil and at least one rotor-fixed transformer secondary coil. A machine controller is coupled to the stator coil and to the at transformer primary coil for operation as a motor and/or as a generator. A demagnetizing circuit is provided that includes at least one dynamo winding arranged on the stator. The demagnetizing circuit has at least one switching device for activating and deactivating the demagnetizing circuit.

An inductively electrically excited synchronous machine is disclosed. The synchronous machine includes a rotor including at least one rotor coil for generating a magnetic rotor field, a stator, on which the rotor is rotatably mounted about an axis of rotation, and including at least one stator coil for generating a magnetic stator field, and a rotary transformer for inductively transmitting electrical energy to the at least one rotor coil. The rotary transforming includes at least one stator-fixed transformer primary coil and at least one rotor-fixed transformer secondary coil. A machine controller is coupled to the stator coil and to the at transformer primary coil for operation as a motor and/or as a generator. A demagnetizing circuit is provided that includes at least one dynamo winding arranged on the stator. The demagnetizing circuit has at least one switching device for activating and deactivating the demagnetizing circuit.

A gas turbine power generation system is configured by a gas turbine, a main power generator which is coupled to a rotor of the gas turbine through a rotation shaft, a rotation rectifier which converts a three-phase AC current into a DC current and transfers the DC current to a field magnet winding wire of the main power generator, an AC exciter which is configured by an armature winding wire, a d-axis field magnet winding wire, and a q-axis field magnet winding wire, and transfers the three-phase AC current generated at the armature winding wire to the rotation rectifier, an excitation device which drives the AC exciter at the time of start-up of the main power generator, and an excitation power supply which supplies a current to the excitation device.

A gas turbine power generation system is configured by a gas turbine, a main power generator which is coupled to a rotor of the gas turbine through a rotation shaft, a rotation rectifier which converts a three-phase AC current into a DC current and transfers the DC current to a field magnet winding wire of the main power generator, an AC exciter which is configured by an armature winding wire, a d-axis field magnet winding wire, and a q-axis field magnet winding wire, and transfers the three-phase AC current generated at the armature winding wire to the rotation rectifier, an excitation device which drives the AC exciter at the time of start-up of the main power generator, and an excitation power supply which supplies a current to the excitation device.

An apparatus includes a first inverter circuit and a second inverter circuit. The first invertor circuit is configured to couple an alternator and a load device to deliver a driving signal from the alternator to the load device. The second invertor circuit is configured to couple the alternator to the load device to deliver a driving signal from the alternator to the load device and configured to couple a battery to the alternator to deliver a charging signal from the alternator the battery.

An apparatus includes a first inverter circuit and a second inverter circuit. The first invertor circuit is configured to couple an alternator and a load device to deliver a driving signal from the alternator to the load device. The second invertor circuit is configured to couple the alternator to the load device to deliver a driving signal from the alternator to the load device and configured to couple a battery to the alternator to deliver a charging signal from the alternator the battery.

The present invention relates to a non-rotating direct current electric generator capable of generating a direct current with high efficiency without rotating a field magnet or an armature. The non-rotating direct current electric generator according to the present invention is a direct current electric generator generating a direct current. and is characterized by comprising a drive unit and a generator unit. wherein the generator unit comprises: a rod-shaped core member: a field magnet having a first hollow part in the center part along with the winding of an electric line. and disposed on the outside of the core member through the first hollow part: and an armature having a second hollow part in the center part along with the winding of an electric line. and disposed on the outside of the core member through the first hollow part. wherein a pole piece is provided between the field magnet and the armature, an insulating plate is disposed between the field magnet and the pole piece and between the armature and the pole piece. and the drive unit supplies a field current to the generator unit on the basis of an alternating current from an alternating current power source.

The present invention relates to a non-rotating direct current electric generator capable of generating a direct current with high efficiency without rotating a field magnet or an armature. The non-rotating direct current electric generator according to the present invention is a direct current electric generator generating a direct current. and is characterized by comprising a drive unit and a generator unit. wherein the generator unit comprises: a rod-shaped core member: a field magnet having a first hollow part in the center part along with the winding of an electric line. and disposed on the outside of the core member through the first hollow part: and an armature having a second hollow part in the center part along with the winding of an electric line. and disposed on the outside of the core member through the first hollow part. wherein a pole piece is provided between the field magnet and the armature, an insulating plate is disposed between the field magnet and the pole piece and between the armature and the pole piece. and the drive unit supplies a field current to the generator unit on the basis of an alternating current from an alternating current power source.

A preformed coil of a rotor of a synchronous generator of a gearless wind power plant is provided. The preformed coil may be arranged around a pole shoe defining a central axis. The preformed coil has a plurality of windings and is made up of laminations.