Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – For magnetizing or demagnetizing
Patent
1994-02-24
1996-09-17
Picard, Leo P.
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
For magnetizing or demagnetizing
361143, 361152, 361153, 361156, H01F 720, H01F 1300
Patent
active
055572480
ABSTRACT:
An apparatus for making permanent magnet material magnetizes a body of material including a primary winding which has portions wound on a first core carrying current in a first direction creating a first field of flux and a secondary winding having portions wound on a second core wherein the secondary winding carries current in a second opposing direction to create a second field of flux. Since the currents are flowing in opposing directions, the secondary field of flux is directed to oppose the first field of flux. The result of this is that the magnetizer is capable of controlling the width of the pole to pole transition region for matching the stator geometry and thereby nearly eliminating cogging torque and reducing ripple torque.
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A. Cassat et al., "Permanent Magnets Used in Brushless DC Motors: The Influence of the Method of Magnetization" pp. 109-122.
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Barrera Raymond M.
Picard Leo P.
Synektron Corporation
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