Axial air gap type electric motor
An axial air gap type electric motor includes: a stator with stator cores in a ring shape around a rotating shaft and including a laminated iron core that is a prismatic body of metal plate-like members laminated in a radial direction of the rotating shaft, a tubular bobbin with an inner diameter into which the laminated iron core is inserted, and a coil wound on the extension of the outer diameter of the laminated iron core; and a rotor plane-facing the rotating shaft direction end section of the stator with a predetermined air gap interposed therebetween. The laminated iron core includes: a core member with continuously laminated metal plate-like members, the widths of which increase in a rotational direction of the rotating shaft from the center toward a radial direction; and a core member with continuously laminated metal plate-like members, the widths of which are substantially equal.
1. An axial air gap type electric motor comprising:
a stator formed by arranging, in a ring shape about a rotating shaft, stator cores each configured by a laminated core, as a prismatic body, made up of laminating metal plate-like members in a radial direction of the rotating shaft, a tubular bobbin having an inner diameter into which the laminated core is inserted, and a coil wound on an extension of an outer diameter of the laminated core; and
at least one rotor plane-facing the cross section of a rotating-shaft direction end portion of the stator via a predetermined air gap,
wherein the laminated core includes:
a first portion formed by continuously laminating the metal plate-like members whose widths in the rotation direction of the rotating shaft are gradually increased from the rotating shaft center in the radial direction; and
a second portion formed by continuously laminating the metal plate-like members whose widths in the rotation direction of the rotating shaft are substantially equal;
wherein the second portion is located on an outermost side in the radial direction of the rotating shaft, and has a largest width in the rotation direction of the rotating shaft among all of the metal plate-like members.
2. The axial air gap type electric motor according to claim 1 , wherein the laminated core further includes:
a third portion formed by continuously laminating the metal plate-like members whose widths in the rotation direction of the rotating shaft are substantially equal and minimum among all of the metal plate-like members constituting the laminated core,
wherein the third portion is located on a closest side to the rotating shaft in the radial direction of the rotating shaft.
3. The axial air gap type electric motor according to claim 1 , wherein the laminated core further includes:
a fourth portion formed by continuously laminating the metal plate-like members whose widths in the rotation direction of the rotating shaft are substantially equal and larger than a minimum width but smaller than a largest width in the widths of the rotation direction among all of the metal plate-like members constituting the laminated core,
wherein the fourth portion is located on a position other than the outermost side and the closest side to the rotating shaft in the radial direction of the rotating shaft.