Ironless, brushless DC motor with wave-winding

Details Ironless, brushless DC motor with wave-winding Ironless, brushless DC motor with wave-winding

1985-02-11

1986-10-21

Shoop, Jr., William M.

Electricity: motive power systems

Switched reluctance motor commutation control

318138, 310 68R, 310180, 310254, H02K 2908

Patent

active

046188061

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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Air Currents, Rotron, 1977, Describing Assignee's Trident Fan.

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