Motor having magnets embedded in a rotor and electric compressor using same

摘要

In the regions around a magnetic shielding space, curved portions and having a rounded shape, which protrude toward the interior space of a magnetic shielding space, are formed at ends of a first side and a second side close to a first end and a second end of an outer-periphery side. In the vicinity of angular portions and of the magnetic shielding space that are positioned at both ends of the outer-periphery side, the magnetic flux density for a given cross-sectional area of a channel through which a short-circuit magnetic flux flows is reduced, and thus, the level of the short-circuit magnetic flux is reduced.

主权项

1. A motor comprising a rotor, the rotor including:
a cylindrical rotor iron core in which a plurality of main magnetic pole portions and auxiliary magnetic pole portions are alternately disposed in a circumferential direction; substantially V-shaped magnet-insertion holes that are provided in correspondence with the respective main magnetic pole portions, the magnet-insertion holes respectively being centered on axes d that pass through a center of the rotor and centers of main magnetic pole portions in the circumferential direction, and a protruding portion of each of the magnet-insertion holes being protruding toward the center of the rotor; two magnets embedded in each of the magnet-insertion holes so as to be along with a substantially V-shape, the two magnets of the respective magnet-insertion holes corresponding to respective poles; and magnetic shielding spaces formed in the substantially V-shaped magnet-insertion holes at both ends thereof in the circumferential direction, wherein each of the magnetic shielding spaces has a side extending along an outer peripheral portion of the rotor, and has angular portions located at both ends of the side of each of the magnetic shielding spaces, wherein each of the angular portions has a curved portion which is formed with a predetermined radius of curvature and whose center is located outside of the magnetic shielding space so that the angular portion has an acute angle, and the side extends along an outer peripheral portion of the rotor.