Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – For magnetizing or demagnetizing
Patent
1998-09-22
2000-09-26
Donovan, Lincoln
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
For magnetizing or demagnetizing
310 51, H01F 1300
Patent
active
061247766
ABSTRACT:
A method is disclosed for shaping the magnetization wave form or flux which is established by a magnetizer which magnetizes the magnet to be used in a motor. The magnetizer includes a steel core having a plurality of axially directed conductors; the annular magnet surrounds the core. A similarly shaped annular backiron surrounds the magnet; the backiron is separated from the magnet by an airgap of a fixed width. The gap is also referred to herein as an "airgap." However, airgap material need not be limited to air. Other materials (e.g., plastic) with similar magnetic permeability to that of air would work equally well. Introducing an airgap between the magnet outer diameter and the steel flux return path backiron results in widening the magnet flux pole-to-pole transition zone, increasing the flux transition angle, reducing torque ripple without serious negative impact on K.sub.e and torque.
REFERENCES:
patent: 4874712 (1989-10-01), Crapo
patent: 4949000 (1990-08-01), Petersen
patent: 5093595 (1992-03-01), Korbel
patent: 5874796 (1999-02-01), Petersen
patent: 5907453 (1999-05-01), Wood et al.
Aiello Anthony Joseph
Grantz Alan Lyndon
Donovan Lincoln
Seagate Technology LLC
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