Self-starting, direct current motor with permanent magnets of varied magnetic strength
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United States of America Patent
Stats
-
Mar 20, 1984
Grant Date -
N/A
app pub date -
Aug 19, 1982
filing date -
Aug 19, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A permanent magnet, direct current motor is made self-starting by the use of permanent magnets with varying magnetization. The use of permanent magnets with varying magnetization results in a rotor position after motor de-energization such that the rotor is angularly offset from a cogged position. This type of motor is made by first, placing uniformly magnetized magnets in a rotor, placing the rotor in an air gap of a toroid on a fixture with a key that correctly positions the rotor, applying a satisfactory magnetic field for a suitable amount of time so that the desired varying magnetization is produced, and finally, assembling the rotor in operative association with the stator so that the at-rest position of the rotor is angularly offset in the direction of rotor rotation from a cogged position.
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