METHOD FOR PRODUCING A ROTOR

摘要

In a method for producing a rotor including a leak prevention hole formed in a rotor core to prevent leakage of magnetic flux from a permanent magnet; an outer-circumferential-side dovetail groove formed in an outer-circumferential-side inner wall of the leak prevention hole, an inner-circumferential-side dovetail groove formed, opposite the outer-circumferential-side dovetail groove, in an inner-circumferential-side inner wall of the leak prevention hole; and a non-magnetic bridge having both end portions engageable with the dovetail grooves, an external force is applied to bring the outer-circumferential-side inner wall close to the inner-circumferential-side inner wall, the non-magnetic bridge is inserted in the dovetail grooves while keeping the rotor core in an elastically deformed state, and, after inserting, the external force is released.

主权项

1. A method for producing a rotor including a rotor core provided with a central hole and a magnet hole formed in an outer circumferential portion, a permanent magnet mounted in the magnet hole, and a rotor shaft press-fit in the central hole,
wherein the rotor includes:
a magnetic flux leakage prevention hole formed in the rotor core to prevent leakage of magnetic flux from the permanent magnet;an outer-circumferential-side dovetail groove formed in an outer-circumferential-side inner wall defining the magnetic flux leakage prevention hole on an outer circumferential side and an inner-circumferential-side dovetail groove formed, opposite the outer-circumferential-side dovetail groove, in an inner-circumferential-side inner wall defining the magnetic flux leakage prevention hole on an inner circumferential side; anda non-magnetic bridge having both end portions being wide-width portions individually engageable with the outer-circumferential-side dovetail groove and the inner-circumferential-side dovetail groove, and wherein the method includes:
applying an external force to the rotor core to cause elastic deformation of the rotor core so that the outer-circumferential-side inner wall of the magnetic flux leakage prevention hole comes close to the inner-circumferential-side inner wall;inserting the both end portions of the non-magnetic bridge one in each of the outer-circumferential-side dovetail groove and the inner-circumferential-side dovetail groove while keeping the rotor core in an elastically deformed state; andreleasing the external force after inserting the non-magnetic bridge.