Patent ID: 8664823
Filing Date: 2014-03-04
Classification: H02K

Abstract:
1. A rotor for a permanent magnet synchronous machine comprising: a rotor core structure having a cylindrical body, the cylindrical body including an outer cylindrical wall of the rotor core structure juxtaposed to a main air gap; a plurality of arcuately-shaped cavities formed within the rotor core structure, the plurality of arcuately-shaped cavities substantially concentrically layered with respect to an outer cylindrical wall of the rotor core structure, each arcuately-shaped cavity extending between first and second end sections is juxtaposed to the outer cylindrical surface wall of the rotor structure and includes an intervening center section; and a plurality of permanent magnets inserted within the plurality of arcuately-shaped cavities wherein each first end section retains a respective first permanent magnet having a first magnet field strength, wherein each second end section retains a respective second permanent magnet having the first magnetic field strength, wherein each center section retains a respective third permanent magnet having a second magnet field strength less than the first magnetic field strength, wherein the first magnet and the second magnet are spaced from the third magnet; wherein a respective cavity includes an air gap formed between the third permanent magnet and the first and second permanent magnets, wherein each air gap follows an indentation formed in a wall of each cavity layer extending radially outward at the interfaces between the third permanent magnet and the first and second permanent magnets, and wherein the air gap generates a reluctance for directing a flow of flux generated by each third permanent magnet in a preceding layer in a direction toward each third permanent magnet in a succeeding layer.