Electromagnetic rotating machine
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United States of America Patent
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Sep 9, 2008
Grant Date -
Aug 10, 2006
app pub date -
Jan 23, 2006
filing date -
Jan 25, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
In order to obtain an electromagnetic rotating machine of lightweight and high energy efficiency, which produces big torque for rotating a large-diameter fan, a coil A and coil B as excitation coils are disposed on an inner peripheral surface of a fan casing so as to face an outer circumference of the fan, and a coil M as an armature coil crosses at a central portion and is disposed on the outer circumference of the fan. The relationships |I.sub.ai|=|I.sub.ai+1| and I.sub.ai=-I.sub.ai+1, or |I.sub.bi|=|I.sub.bi+1| and I.sub.bi=-I.sub.bi+1 are obtained respectively for the coil A or coil B by a current control device (not shown). Moreover, the coil A and coil B are subjected to excitation control such that the direction of effective electromagnetic force, which is generated by an interaction between an effective magnetic field formed by the coil A and effective induced current applied to the coil M by the coil B, corresponds to the direction of rotation of the fan.
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