| CPC H02K 1/2766 (2013.01) | 5 Claims |
|
1. A rotor that is to be provided in a rotating electric machine, the rotor comprising:
a cylindrical-shaped rotor core constituted by a multiplicity of laminated steel plates and provided with magnets that are disposed on opposite sides, in a circumferential direction of the rotor core, of a q-axis extending in a radial direction of the rotor core,
wherein the rotor core includes a caulking portion that is provided on the q-axis, such that the laminated steel plates are positioned relative to each other by the caulking portion,
wherein the magnets include a pair of first magnets disposed symmetrically with each other with respect to the q-axis and a pair of second magnets disposed symmetrically with each other with respect to the q-axis, such that the second magnets are located closer than the first magnets to an outer peripheral side of the rotor core,
wherein each of the first and second magnets has a rectangular shape in a cross section thereof perpendicular to an axis about which the rotor is to be rotated, and a distance between the pair of first magnets and a distance between the pair of second magnets on a perpendicular plane perpendicular to the axis are increased in a direction away from the outer peripheral side toward an inner peripheral side of the rotor core,
wherein an angle at a first vertex as an intersection of extensions of long sides of rectangular-shaped cross sections of the pair of first magnets which are opposed to each other with the q-axis being located therebetween, is larger than an angle at a second vertex as an intersection of extensions of long sides of rectangular-shaped cross sections of the pair of second magnets which are opposed to each other with the q-axis being located therebetween,
wherein the pair of first magnets cooperate with each other to define a first magnetic-flux passage therebetween, and the pair of second magnets cooperate with each other to define a second magnetic-flux passage therebetween, and
wherein the caulking portion is disposed in a position which lies on the q-axis and which is located in a region between first and second imaginary lines in the radial direction of the rotor core, such that the first imaginary line is an arc having a center of curvature that lies at the second vertex and passing through outer-peripheral-side boundary points of the first magnetic-flux passage that are outer-peripheral-side end portions of the respective long sides of the rectangular-shaped cross sections of the pair of first magnets, and such that the second imaginary line is an arc having a center of curvature that lies at the second vertex and passing through inner-peripheral-side boundary points of the second magnetic-flux passage that are inner-peripheral-side end portions of the respective long sides of the rectangular-shaped cross sections of the pair of second magnets.
|