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US 4,303,844 AGranted
Small D.C. motor
OwnerTadashi Suzukiinventor
Life of this patent
Estimating the term…
Abstract
A D.C. motor is disclosed having a magnetic plate disposed on the upper surface of the rotor for normally urging a rotor of the motor downwards. The spacing between the magnetic plate and a cover plate of the motor is made larger than the spacing of the rotor from the cover plate to ensure that the magnetic plate will not be unduly attracted to the cover plate.
Claims8
A motor including
- a substantially cylindrical housing made from a magnetic material;
- a rotor member mounted within said housing and having a plurality of coils formed therein;
- a rotary shaft held to a center portion of said rotor member;
- a permanent magnet fixed in said housing and spaced from one surface of said rotor member;
- a magnetic element held concentrically to the other surface of said rotor member;
- a thrust bearing secured adjacent said permanent magnet to said housing and adapted to receive an end portion of said rotory shaft;
- and
- the wall portion of said housing adjacent said magnetic element having a raised portion formed therein adjacent to said magnetic element.
5 more elements
Dependencies are inferred from the claim text.