a corresponding plurality of pole piece concentrators attached to said inside pole surfaces of said magnets, respectively, {HEAD ~ each pole piece concentrator} having {TAIL ~ two radially opposite ends}, one radially opposite end being an inside end and the other radially opposite end being an outside end, each pole piece tapering radially inwardly from a relatively large cross sectional area at its outside end adjacent said inside pole surface of its respective magnet to a relatively small cross sectional area at its opposite and inside end, 
a corresponding plurality of pole piece concentrators attached to said inside pole surfaces of said magnets , respectively , { HEAD ~ each pole piece concentrator } having { TAIL ~ two radially opposite ends } , one radially opposite end being an inside end and the other radially opposite end being an outside end , each pole piece tapering radially inwardly from a relatively large cross sectional area at its outside end adjacent said inside pole surface of its respective magnet to a relatively small cross sectional area at its opposite and inside end ,
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