The other member includes a plurality of permanent magnet poles substantially equidistantly distributed with alternating magnetic polarity along the angular extent of the radial air gap formed between the members, the permanent magnet poles having {TAIL ~ a discontinuous magnetic return path}, thereby dividing {HEAD ~ the member} into magnetically isolated groups of permanent magnet poles 
The other member includes a plurality of permanent magnet poles substantially equidistantly distributed with alternating magnetic polarity along the angular extent of the radial air gap formed between the members , the permanent magnet poles having { TAIL ~ a discontinuous magnetic return path } , thereby dividing { HEAD ~ the member } into magnetically isolated groups of permanent magnet poles
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