Rotor, interior permanent magnet motor, and compressor

Abstract

A rotor for an interior permanent magnet motor, an interior permanent magnet motor, and a compressor includes a rotor core, a plurality of U-shaped permanent magnet accommodating grooves, a plurality of first air grooves, and a plurality of first recesses, wherein the plurality of U-shaped permanent magnet accommodating grooves are arranged inside the rotor core at intervals; the plurality of first air grooves are provided outside the ends of the U-shaped permanent magnet accommodating grooves; and each first air groove is located on an extension line of the end of the corresponding U-shaped permanent magnet accommodating groove and is close to the outer contour of the rotor so as to form a plurality of first magnetic isolation bridges. Each first recess is recessed from the outer contour of the rotor towards the center of the rotor, starts from the end of the corresponding first magnetic isolation bridge at the outermost side of the rotor, and at most, extends to the first intersection point of the connecting line between the bottom center of the U-shaped permanent magnet accommodating groove and the center of the rotor, and the outer contour of the rotor, such that the air gap magnetic density generated between the outer contour of the rotor and the inner contour of a stator of the interior permanent magnet motor approaches a sine curve.