Computer controlled electric motor and method therefor
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Apr 4, 2000
Grant Date -
N/A
app pub date -
Aug 27, 1997
filing date -
Aug 27, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A section of the rotor of an electric motor includes a Neodymium plastic bonded magnetic material annulus having a plurality of permanent magnets having magnetic poles alternately disposed thereon and pressed onto the periphery of a plastic disc. The annulus is magnetized to provide thirty six evenly spaced similar permanent magnets with their north and south poles alternately disposed along the periphery of the rotor section. Five rotor sections are provided to provide the rotor. Each rotor section is coaxially connected to the shaft of the electric motor. A stator of the electric motor preferably has five stator sections with each having thirty two stator coils that each have one end proximal to the periphery of the annulus. Each stator of the electric motor is disposed about a corresponding rotor section and separated therefrom by an air gap. When a stator coil of each stator section has an angular position that is intermediate to the angular positions of a pair of adjacent permanent magnets of an adjacent rotor section, a coil excitation current through the stator coil causes it to have a magnetic field that attracts one magnet of the pair and repels the other thereby causing the rotor section and the attached shaft to rotate in a given selected direction.
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