Patent ID: 8487496
Filing Date: 2013-07-16
Classification: H02K

Abstract:
1. A method of manufacturing a rotor retention system, said method comprising: providing a rotor hub having a plurality of channel openings formed on an outer circumferential surface of the rotor hub defining a plurality of axially extending channels; engaging a plurality of pole pieces extending through the outer circumferential surface of the rotor hub into respective axially extending channels, the rotor hub retaining the plurality of pole pieces against centrifugal forces and defining a plurality of pole-hub gaps on the outer circumferential surface of the rotor hub, each of the pole-hub gaps extending tangentially, with respect to the rotor hub, from below a magnet-facing radially-extending wall of the respective pole piece towards the respective channel opening for that pole piece; configuring a plurality of clamp members between consecutive pole pieces, each of the plurality of clamp members having lateral extension portions engaging in the respective pole-hub gaps between the rotor hub and the respective consecutive pole pieces; and maintaining a plurality of magnets relative to the rotor hub and between the respective consecutive pole pieces by respective clamp members.