Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2005-07-12
2005-07-12
Mullins, Burton (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S012060, C310S261100, C310S180000
Reexamination Certificate
active
06917136
ABSTRACT:
Synchronous motors according to the invention operate at higher efficiency, with lower cost, reduced mass and reduced cogging. Magnet dimensions are selected that reduce cogging forces to a negligible amount even though there are fewer slots than normal. Optionally, it is possible to use non-overlapping windings with deeper and open slots. The approach is applicable to both rotary and linear motors and motors using either permanent magnets or electromagnets in the field structure. It is particularly relevant to linear or rotary motors that have a large air gap, and to small motors that must deliver a high ratio of thrust or torque to motor mass.
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Clark Tracy M.
Thornton Richard D.
MagneMotion, Inc.
Mullins Burton
Nutter McClennen & Fish
Powaner David J.
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