Abstract: A coolant pump system for a variable speed generator includes a variable displacement pump mounted within the generator and coupled to the generator rotor such that the pump is driven at a speed proportional to the rotational speed of the generator rotor. The displacement of the pump is controlled by moving a pump stator with respect to the pump rotor. A spring positioned between the generator housing and the pump stator provides a biasing force which tends to move the pump stator in a direction that increase displacement of the pump. Back pressure in the coolant system is used to provide a force which tends to move the pump stator in a direction that decreases the pump displacement as the back pressure increases. An additional force on the pump stator which tends to further reduce pump displacement is electromagnetically controlled in response to the electrical load placed on the generator and/or the speed of the generator rotor.

Abstract: An integrated drive-generator system in which a casing housing a constant speed drive unit is attached to a casing housing a generator unit with means being provided to isolate mechanically debilitating debris within the unit which expelled it and so avoid damaging the other unit. The units share a common lubrication-coolant fluid system which provides fluid circulation to both from a reservoir. Expelled debris is isolated within the faulty unit by a barrier partition which separates the interiors of the units' casings and supports a breather which promotes fluid communication between the units' casings and permits a single pressurizing device to service both units. A scavenge pump for extracting fluid from each unit and transmitting it to the reservoir is located within the unit it services. As a result, if debris expelled by either unit becomes entrained in the fluid of that unit, only the scavenge pump within that unit will be damaged or jammed and system repair will be limited to the faulty unit.