Method of producing a frame body for an electric motor
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorTohru Gotoh
Life of this patent
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Abstract
A method of producing a frame body for an electric motor comprises a step of bending a flat plate having a given size into a generally round body, a step of pressing the generally round body in the radial direction by a metal mold having a given inner diameter, a step of welding edge surface portions opposing each other of the generally round body to form a cylindrical frame body, a step of attaching heat radiation fins on the outer circumferential surface of the frame body by welding, and a step of pressing the inner circumferential surface of the frame body in the radial direction so that the frame body has a predetermined inner diameter.
Claims5
A method of producing a frame body for an electric motor which comprises in sequence:
- (1) a step of bending a flat plate having a given size into a generally round body,
- (2) a step of shaping said generally round body into a substantially true circle by pressing the generally round body in a radially inward direction by a metal mold having a given inner diameter,
- (3) a step of welding edge surface portions opposing each other of the body to form a cylindrical frame body,
- (4) a step of attaching heat radiation fins on the outer circumferential surface of the frame body by welding, whereby said frame body is deformed by thermal stresses, and
- (5) a step of plastically shaping said frame body having attached heat radiation fins into a substantially true circle by pressing the inner circumferential surface of the frame body in a radially outward direction until the frame body has a predetermined inner diameter.
Dependencies are inferred from the claim text.