Patent ID: 9692266
Date: 2017-06-27
CPC Classifications: H02K

Claim:
1. A rotor of a permanent magnet synchronous machine comprising: a rotor core structure including a plurality of stacked laminations; a first set of apertures formed in a first radial layer of the rotor core structure; a first set of permanent magnets inserted within the first set of apertures forming respective poles within the rotor core structure; wherein the first set of apertures includes a demagnetization structure formed on an outermost wall of the first set of apertures, wherein the demagnetization structure forms air gaps between the outermost wall of the first set of apertures and the first set of permanent magnets disposed therein; a second set of apertures formed in a second radial layer of the rotor core structure, each pole including an aperture from the second set of apertures, the second set of apertures formed radially inward from the first set of apertures; a third set of apertures formed in a third radial layer of the rotor core structure, the third set of apertures is formed radially outward from the first set of apertures; a second set of permanent magnets inserted within the third set of apertures, wherein a respective pair of permanent magnets within a pole cooperatively generates a magnetic field in a same direction within the pole, and wherein the magnetic field generated by a pair permanent magnets in a respective pole is opposite to a magnetic field generated by permanent magnets in an adjacent pole; and a plurality of bridges each extending across a respective side of each of the third set of apertures in the third radial layer, the plurality of bridges providing structural support of the rotor core structure when operating, the plurality of bridges being integrally formed as single-piece laminations.