Reconfigurable inductive to synchronous motor
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United States of America Patent
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Oct 16, 2012
Grant Date -
May 5, 2011
app pub date -
Oct 15, 2010
filing date -
Oct 30, 2009
priority date (Note) -
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Abstract
A reconfigurable electric motor includes a rotor containing rotatable permanent magnets or non-magnetically conducting shunting pieces. The magnets and/or shunting pieces have a first position producing a weak magnetic field for asynchronous induction motor operation at startup and a second position producing a strong magnetic field for efficient synchronous operation. The motor includes a squirrel cage for induction motor operation at startup with the permanent magnets and/or shunting pieces positioned to product the weak magnetic field to not interfere with the startup. When the motor approaches or reaches synchronous RPM, the permanent magnets and/or shunting pieces rotate to produce a strong magnetic field for high efficiency synchronous operation. The position of the magnets and/or shunting pieces may be controlled by a centrifugal mechanism, or viscous damping may delay rotation of the magnets and/or shunting pieces, or electrically controlled apparatus may control positions of the magnets and/or shunting piece.
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