Stator core for rotating electrical machine
AssigneeDenso Corporation
InventorTakashi Tokizawa
Life of this patent
Estimating the term…
Abstract
A stator core manufacturing method has a winding process including an L-bending process in which an outer edge of a strip of steel sheet is bent at an angle to a general plane of the strip, an edgewise-bending process in which the outer edge of the strip is bent edgewise into an arc, and a roll-bending process in which the outer edge of the strip is bent into a curve warping in a thickness direction of the strip, wherein the L-bending process, the edgewise-bending process and the roll-bending process are performed successively in a predetermined sequence before the strip is wound in a spiral fashion so as to form a generally cylindrical core.
Claims9
A stator core for a rotating electrical machine comprising:
- a generally cylindrical core having a helical plurality of turns formed from a strip of steel sheet having a plurality of spaced magnetic pole teeth press-formed along a first edge thereof,
- wherein a second edge of the strip opposite the toothed first edge is inclined at an angle to a plane normal to an axis of the cylindrical core,
- the second edge of the strip being bent edgewise into an arc with the toothed first edge of the strip being radially inside,
- the second edge of the strip being bent into a curve warping in a thickness direction of the strip, each layer of helically turned steel sheet having the same bend angle, and
- a perimeter portion becomes thinner than other portions in the helical core.
Dependencies are inferred from the claim text.