Patent ID: 9054568
Filing Date: 2015-06-09
Classification: F04D,H02K

Abstract:
1. A permanent magnet pump motor having a permanent magnet rotating electric machine that includes a rotor and a stator, the rotor comprising: a permanent magnet forming a single pole within a rotor core of the rotor, the permanent magnet being divided into two across a magnetic pole center and arranged such that the magnetic pole center and a magnetization direction of the permanent magnet extend in parallel with each other; a connecting portion assuming an electrical steel sheet disposed between the two divided permanent magnets; and magnet insertion holes in which the permanent magnets are inserted, wherein each of the magnet insertion holes is shaped to include: air gaps at both end portions in a width direction that is perpendicular to the magnetization direction of the permanent magnet, each air gap being formed between all of an end surface of the end portions and the electrical steel sheet in each of the magnet insertion holes; a shoulder portion disposed on the facing surface, the shoulder portion having a length shorter than a thickness in the magnetization direction of the permanent magnet; and another air gap extending toward a rotor outside diameter side and the magnetic pole center side in a direction perpendicular to the shoulder portion on an outside of the shoulder portion.