Patent ID: 7768169
Filing Date: 2010-08-03
Classification: H02K

Abstract:
1. A permanent magnet rotor arrangement comprising: a rotor having a rim; a circumferential array of magnet carriers affixed to a radially outer surface of the rim of the rotor, each magnet carrier being made of magnetic material and having a radially outer surface; an inverted U-shaped pole piece retainer made of non-magnetic material affixed to each magnet carrier and formed with a channel; an axial array of pole pieces made of permanent magnet material located adjacent to the radially outer surface of each magnet carrier and in the channel formed in its associated pole piece retainer, each pole piece being configured such that magnetic flux generated by the respective pole piece passes through the respective pole piece and the respective magnetic carrier in a predominantly radial direction into the rim of the rotor; and each magnet carrier and its associated pole piece retainer extending axially along the rim of the rotor.