Rotor for rotary electric machine having a magnetic flux-restraining hole

摘要

In a rotor for a rotary electric machine, a plurality of magnetic poles are provided in a radially outer portion of the rotor iron core, at intervals in the circumferential direction. Each magnetic pole includes a pair of permanent magnets disposed apart from each other in the circumferential direction, and a magnetic flux-restraining hole that is formed and extended radially inwardly between radially inner end portions of the permanent magnets and that restrains flow of magnetic flux. The magnetic flux-restraining hole is extended so as to project beyond a position of the radially inner end portions to a radially outer side, between the pair of permanent magnets.

主权项

1. A rotor for a rotary electric machine, comprising:
a rotor iron core; and a plurality of magnetic poles provided at intervals in a circumferential direction of the rotor iron core within a radially outer-side interior of the rotor iron core, wherein each of the magnetic poles includes a pair of permanent magnets disposed apart from each other in the circumferential direction, and a magnetic flux-restraining hole that is formed and extended radially inwardly between radially inner end portions of the permanent magnets and that restrains flow of magnetic flux, and the magnetic flux-restraining hole is extended so as to project beyond a position of the radially inner end portions to a radially outer side, between the pair of permanent magnets, wherein the pair of permanent magnets are disposed so that an interval distance between the permanent magnets increases toward the radially outer side of the rotor iron core, and the magnetic flux-restraining hole includes two first holes that respectively communicate with magnet insertion holes that are provided for inserting the permanent magnets into the rotor iron core, and a second hole that is formed between the two first holes and that is separated from the first holes by a bridge portion, and a projection width of the first holes from the radially inner end portions of the permanent magnets is larger than the projection width of the second hole from the radially inner end portions of the permanent magnets, wherein the projection widths of the two first holes and the second hole are widths measuring a distance from an imaginary straight line that connects circumferentially inner corner portions of the pair of permanent magnets to an outer radial edge of the two first holes and an outer radial edge of the second hole, wherein the two first holes are mirror symmetric about a magnetic pole center line, and the second hole is formed in a rectangular shape and symmetric about the magnetic pole center line.