Electric motor with axially movable rotor assembly
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United States of America Patent
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Sep 17, 2013
Grant Date -
Mar 31, 2011
app pub date -
Jul 24, 2007
filing date -
Jul 24, 2006
priority date (Note) -
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Abstract
A mechanical structure (16) for enabling a rotor (28) in a permanent magnet electric motor A to be moved axially relative to a stator (14) under an actuating force, without experiencing frictional sliding during such a movement. As the rotor (28) is moved away from the stator (14), the motor magnetic field is weakened, enabling the motor A to operate efficiently at elevated speeds, extending speed coverage under constant power.
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