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For a dynamoelectric machine, excitation power is supplied by a main exciter having two field windings. A first field winding is driven by a pilot exciter which supplies base excitation (small signal) for the main exciter. Forcing excitation (large signal) is supplied by the second field winding whi

For a dynamoelectric machine, excitation power is supplied by a main exciter having two field windings. A first field winding is driven by a pilot exciter which supplies base excitation (small signal) for the main exciter. Forcing excitation (large signal) is supplied by the second field winding which is driven by an external, supplemental power source. The main exciter can thus provide the appropriate excitation for both normal and transient operating conditions. In addition, by switching the controlled rectifier elements associated with the supplemental power source, the second field winding is also capable of providing fast de-excitation for the main exciter.

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In combination, a synchronous dynamoelectric machine having a stator member carrying an alternating current armature winding and a rotor member carrying a direct current field winding; a main exciter for said synchronous dynamoelectric machine having a rotor member carrying an armature winding, and

In combination, a synchronous dynamoelectric machine having a stator member carrying an alternating current armature winding and a rotor member carrying a direct current field winding; a main exciter for said synchronous dynamoelectric machine having a rotor member carrying an armature winding, and a stator member having both a first and a second field winding, said first and said second field windings connected in parallel electrical relation to one another; a rotatable rectifier assembly having an input circuit connected to receive alternating current power from said main exciter armature, and an output circuit connected to conduct direct current excitation through said synchronous machine rotor field winding; a pilot exciter having a stator member carrying an armature winding and a permanent magnet rotor member, said pilot exciter being connected electrically in series with said first field winding; means mechanically connecting said dynamoelectric machine rotor member, said rotatable rectifier assembly, said main exciter rotor member, and said pilot exciter permanent magnet rotor member for rotation; means for converting alternating current to direct current having an input circuit connected to receive electrical power from said pilot exciter armature winding and having an output circuit connected to supply direct current to said first field winding of said main exciter; means for deriving direct current excitation from a supplemental power source, said deriving means having an input circuit connected to receive electrical power from said supplemental power source and having an output circuit connected to supplement the direct current excitation applied to said second field winding of said main exciter, said supplemental power source being connected electrically in series with said second field winding and electrically independent of said dynamoelectric machine; and whereby said pilot exciter and said supplemental power source are connected electrically in parallel to and regulated independently of each other.