Patent ID: 9735634
Date: 2017-08-15
CPC Classifications: H02K

Claim:
1. A rotor for a permanent magnet synchronous machine comprising: a rotor core structure; a first set of permanent magnets forming respective poles within the rotor core structure, each pole including a pair of permanent magnets from the first set of permanent magnets; a first set of apertures formed in a first radial layer of the rotor core structure, the first set of permanent magnets inserted within the first set of apertures, each pole includes a pair of apertures from the first set of apertures, the respective apertures within a respective pole are spaced a first circumferential distance apart; a second set of apertures formed in a second radial layer of the rotor core structure, wherein each pole includes a pair of apertures from the second set of apertures, wherein the second set of apertures is 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, wherein 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, the second set of permanent magnets having a different magnetic field strength relative to the first set of permanent magnets, wherein each pole includes a pair of permanent magnets from the first set of permanent magnets and a pair of permanent magnets from the second set of permanent magnets cooperatively generating a magnetic field in a same direction; wherein the permanent magnets in the first and second layers of a respective pole generates the magnetic field in a direction opposite to a magnetic field generated by the permanent magnets in the first and second layers of an adjacent pole.