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