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An integrated drive generator (40) for generating constant frequency alternating current which is driven by a drive shaft (12) at variable rotational speeds includes an alternating current generator (23) having a rotor (37) mounted on a first shaft (42), which is driven by an output of a constant sp

An integrated drive generator (40) for generating constant frequency alternating current which is driven by a drive shaft (12) at variable rotational speeds includes an alternating current generator (23) having a rotor (37) mounted on a first shaft (42), which is driven by an output of a constant speed drive (14) at a fixed rotational velocity, the constant speed drive also driving a second shaft (44) at a fixed rotational velocity; an exciter (20) having a rotor (32) mounted on the first shaft, electrically coupled to a field winding of the generator, for supplying electrical power to the field winding of hte alternating current generator; and a permanent magnet generator (18) having a rotor (24) mounted on the second shaft, electrically coupled to the exciter, for supplying electrical power to a field winding of the exciter. Using the second shaft reduces weight, as well as length.

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An integrated drive generator for generating constant frequency alternating current which is driven by a drive shaft at variable rotational speeds comprising: a constant speed drive including a differential having an input coupled to the drive shaft and a first side of the differential and at least

An integrated drive generator for generating constant frequency alternating current which is driven by a drive shaft at variable rotational speeds comprising: a constant speed drive including a differential having an input coupled to the drive shaft and a first side of the differential and at least one output coupled to the first side of the differential which rotates at a fixed rotational velocity in response to the drive shaft rotating at a variable velocity and which drives a first drive shaft at a fixed rotational velocity and a second drive shaft at a fixed rotational velocity; an alternating current generator having a rotor mounted on the first shaft for generating the constant frequency alternating current; an exciter having a rotor mounted on the first shaft, electrically coupled to a field winding of the alternator, for supplying electrical power to the field winding; and a generator, having a rotor mounted on the second shaft, electrically coupled to the exciter, for supplying electrical power to a field winding of the exciter.