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US 2017/0321610 A1Published application
Anti-Windmilling Starter Generator
AssigneeHamilton Sundstrand Corporation
InventorJay M. Francisco
Life of this patent
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Abstract
An APU has a gas turbine engine and a starter generator to be selectively driven by the gas turbine engine. A sensor senses windmilling of components associated with the starter generator. A lock feature limits rotation within the starter generator when windmilling is sensed. A method of operation is also disclosed.
Claims8
An auxiliary power unit (APU) comprising:
- a gas turbine engine, and a starter generator to be selectively driven by said gas turbine engine;
- and
- a sensor for sensing windmilling associated with said starter generator, and a lock feature for limiting rotation within said starter generator when windmilling is sensed.
An auxiliary power unit (APU) and air supply system comprising:
- a gas turbine engine, and a starter generator to be selectively driven by said gas turbine engine;
- a sensor for sensing undesired rotation of components associated with said starter generator, and a lock feature for limiting rotation of said components within said starter generator when undesired rotation is sensed;
- and
- the lock feature including a supply of AC power into a DC powered stator associated with a DC powered rotor, and a control communicating with said sensor, and receiving a signal when undesired rotation is sensed to supply AC power to said stator.
1 more element
A method of operating an auxiliary power unit (APU) comprising the steps of:
- (a) sensing undesired rotation in a starter generator associated with an APU;
- and
- (b) locking components of the starter generator against undesired rotation when undesired rotation is sensed.
Dependencies are inferred from the claim text.