Self-starting, direct current motor with permanent magnets...

Details Self-starting, direct current motor with permanent magnets... Self-starting, direct current motor with permanent magnets...

H - Electricity

02

K

310/73

H02K 21/14 (2006.01) H01F 7/02 (2006.01) H02K 15/03 (2006.01) H02K 15/16 (2006.01) H02K 29/08 (2006.01)

Patent

CA 1196366

ABSTRACT OF THE DISCLOSURE 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 mag- netic 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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