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US 11,077,953 B2Granted
Electric ducted fan
AssigneeROLLS-ROYCE plc
InventorGiles E. Harvey
Life of this patent
Estimating the term…
Abstract
An electric ducted fan for an aircraft is shown. A nacelle defines a duct that houses a propulsive fan having a fan diameter DF. An electric machine is configured to drive the fan, and has an electromagnetically active length LA and an electromagnetically active diameter DA defining an aspect ratio (LA/DA) of from 0.8 to 2. A speed reduction device is located between the electric machine and the fan, and has a reduction ratio of at least 3:1. A ratio of the electromagnetically active diameter DA to the fan diameter DF (DA/DF) is from 0.3 to 0.5.
Claims15
An electric ducted fan for an aircraft, comprising:
- a nacelle defining a duct;
- a propulsive fan in the duct having a fan diameter DF;
- an electric machine configured to drive the fan, the electric machine having an electromagnetically active length LA and an electromagnetically active diameter DA defining an aspect ratio (LA/DA) of from 0.8 to 2;
- a speed reduction device between the electric machine and the fan, having a reduction ratio of at least 3:1;
- and wherein a ratio of the electromagnetically active diameter DA to the fan diameter DF (DA/DF) is from 0.3 to 0.5.
2 more elements
Dependencies are inferred from the claim text.