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US 6,787,949 B2Granted
Optimized thermal system for an electric motor
AssigneeEmerson Electric Co.
InventorsPeter K. Bostwick, Daniel E. Bailey, Nathan C. Owen, Philip S. Johnson, Barry M. Newberg
Life of this patent
Estimating the term…
Abstract
The cooling of an electric motor is optimized by the housing of the motor being provided with inlet vent holes that are positioned and sized to increase a total air flow rate through the housing interior and by the interior surface of the housing being shaped to conform to the stator winding end turns of the motor to direct a flow of cooling air around a greater surface area of the winding end turns before being exhausted through outlet vent holes of the housing.
Claims33
An apparatus with optimized cooling comprising:
- an electrical device having a rotating shaft with a center axis, the shaft center axis defining mutually perpendicular axial and radial directions relative to the electrical device;
- a housing having an interior volume containing the electrical device, the housing having a first end wall and a second end wall at axially opposite ends of the interior volume and a side wall connected between the first end wall and the second end wall and surrounding the interior volume, the first end wall having opposite interior and exterior surfaces with the interior surface opposing the interior volume of the housing, the interior surface having an annular concave surface and the exterior surface having an annular convex surface.
An apparatus with optimized cooling comprising:
- an electrical device having a rotating shaft with a center axis, the shaft center axis defining mutually perpendicular axial and radial directions relative to the electrical device, and a stator around the shaft, the stator having axially opposite ends and stator winding end turns at the stator axially opposite ends;
- a housing having an interior volume containing the electrical device, the housing having a first end wall and a second end wall at axially opposite ends of the interior volume and a side wall connected between the first end wall and the second end wall and surrounding the interior volume, the first end wall and the second end wall supporting the shaft for rotation in the housing, and a plurality of vent holes through the first end wall and arranged in a circle around the shaft with there being no other vent holes through the first end wall other than the plurality of vent holes arranged in the circle.
An apparatus with optimized cooling comprising:
- an electrical device having a rotating shaft with a center axis, the shaft center axis defining mutually perpendicular axial and radial directions, and a stator around the shaft, the stator having axially opposite ends and stator winding end turns at the stator axially opposite ends;
- a housing having an interior volume containing the electrical device, the housing having a first end wall and a second end wall at axially opposite ends of the interior volume and a side wall connected between the first and second end walls and surrounding the interior volume, the first end wall and the second end wall supporting the shaft for rotation in the housing, and a plurality of vent holes through the second end wall with each vent hole passing through the second end wall and the side wall of the housing where the second end wall is connected to the side wall.
An apparatus with optimized cooling comprising:
- an electrical device having a rotating shaft with a center axis, the shaft center axis defining mutually perpendicular axial and radial directions relative to the electrical device, and a stator around the shaft, the stator having axially opposite ends and stator winding end turns at the axially opposite ends;
- a housing having an interior volume containing the electrical device, the housing having a first end wall and a second end wall at axially opposite ends of the interior volume and a side wall connected between the first end wall and the second end wall and surrounding the interior volume, the first end wall having opposite interior and exterior surfaces with the interior surface opposing the interior volume of the housing and opposing stator winding end turns at one end of the stator with there being an axial spacing between the stator winding end turns and the first end wall interior surface, and the axial spacing between the stator winding end turns and the first end wall interior surface decreases as the spacing extends radially inwardly from an outer periphery of the stator winding end turns toward the center axis of the electrical device shaft.
Dependencies are inferred from the claim text.