Ironless, brushless DC motor with wave-winding
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United States of America Patent
Stats
-
Oct 21, 1986
Grant Date -
N/A
app pub date -
Feb 11, 1985
filing date -
Feb 11, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A simplified fan and brushless DC motor has a rotor with an annular permanent magnet that is magnetized in segments about its circumference and is associated with a wave-wound stator coil. Alternate circumferential segments of the magnet are oppositely polarized. Fan blades are located within the annular magnet. The wave-winding varies in position to present alternate magnetic fields opposite in direction to the rotor magnet outer surface to cause rotation thereof. The stator is ironless. The coil can have two bifilar windings alternately energized. A Hall device is, typically, employed for commutation along with suitable switching circuitry.
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Family
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Cited Art Landscape
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