ROTARY ELECTRIC MACHINE

摘要

A contour line on the outer circumferential side of each magnet hole in the first layer is formed to be an arc passing through a total of three intersections, i.e., an intersection of a d axis and a reference magnetic flux line which is a magnetic flux line as a reference positioned inward by a predetermined number of magnetic flux lines from the outer circumferential edge of a rotor core, and intersections of: the reference magnetic flux line; and sides at the circumferential ends of the magnet hole which are positioned inward by a bridge dimension from the outer circumferential edge of the rotor core. Thus, a rotary electric machine that enables maximum utilization of reluctance torque and magnet torque and suppression of torque ripple can be obtained with simple processing and low cost.

主权项

1. A rotary electric machine comprising a stator and a rotor, wherein
the rotor includes a rotor core having a plurality of magnetic poles formed by inserting permanent magnets into magnet holes formed at regular intervals in a circumferential direction, and in the case where a magnetic flux flowing along a d axis corresponding to a direction of a center line of each magnetic pole is defined as a d-axis magnetic flux, and a magnetic flux flowing along a q axis corresponding to a direction of a center line between the magnetic poles is defined as a q-axis magnetic flux, a contour line along the circumferential direction of each magnet hole in a cross section perpendicular to a rotation axis of the rotor is formed to be an arc passing through three intersections at which one of magnetic flux lines of the q-axis magnetic flux intersects with a circumferential-center line and circumferential-end sides of the magnet hole, wherein the magnet hole includes a plurality of magnet holes formed along a radial direction of the rotor, such that the number of magnetic flux lines of the q-axis magnetic flux calculated when the magnet holes are not formed in the rotor core is the same among: a part between an outer circumferential edge of the rotor core and the magnet hole formed on a radially outermost side; a part between a contour line on a radially outer side and a contour line on a radially inner side of each formed magnet hole; and a part between the magnet holes adjacent to each other in a radial direction.