Electrical machine with reduced windage loss
AssigneeHamilton Sundstrand Corporation
InventorDebabrata Pal
Life of this patent
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Abstract
An electrical machine includes a rotor located at a central shaft and a stator located radially outboard of the rotor and secured at a back iron. A first baffle is coupled to the central shaft at one axial end of the rotor, the baffle extending radially outwardly from the shaft toward a baffle cavity at the back iron. A flow of coolant is urged toward the baffle cavity along the baffle via centrifugal force. A method of flowing coolant through an electrical machine includes injecting a flow of coolant substantially radially into an electrical machine cavity. The flow of coolant is urged radially outwardly along a rotating baffle located at one axial end of a rotor of the electrical machine via centrifugal force and into a baffle cavity disposed at the back iron at a radial end of the baffle.
Claims17
An electrical machine comprising:
- a rotor disposed at a central shaft;
- a stator disposed radially outboard of the rotor and secured at a back iron;
- and
- a first baffle disposed coupled to the central shaft at one axial end of the rotor, the baffle extending radially outwardly from the shaft toward a baffle cavity at the back iron;
- wherein a flow of coolant is urged toward the baffle cavity along the baffle via centrifugal force.
An electrical machine comprising:
- two or more rotors arranged axially along a central shaft;
- two or more stators disposed at a back iron, each stator disposed radially outboard of a rotor of the two or more rotors;
- and
- a plurality of baffles, each baffle disposed at an axial end of a rotor of the two or more rotors, each baffle of the plurality of baffles extending radially outwardly from the shaft toward a plurality of baffle cavities at the back iron;
- wherein a flow of coolant is urged toward the plurality of baffle cavities along the plurality of baffles via centrifugal force.
A method of flowing coolant through an electrical machine comprising:
- injecting a flow of coolant substantially radially into an electrical machine cavity;
- urging the flow of coolant radially outwardly along a rotating baffle disposed at one axial end of a rotor of the electrical machine via centrifugal force;
- and
- urging the flow of coolant into a baffle cavity disposed at the back iron at a radial end of the baffle.
Dependencies are inferred from the claim text.