Drive motor for magnetic disks, optical disks, and magneto-optical disks

A motor, suitable for driving a magnetic disk, an optical disk, or a magneto-optical disk, which comprises:

• a. a frame having a planar bottom member;
• b. an upstanding shaft on said planar bottom member, said upstanding shaft including a lower portion having a central bore and a post having upper and lower portions, said post lower portion being secured within said central bore, and said post upper portion having an outer surface having two spaced apart circumferential recesses for providing bearing inner races;
• c. an aperture in said planar bottom member;
• d. upper and lower spaced apart bearings mounted on said post upper portion and in said recesses proximate said planar bottom member;
• e. a cup shaped rotor having a central hub mounted on said bearings to allow said rotor to rotate about said upstanding shaft, said central hub including a depending cylindrical wall portion mounted on said lower bearing;
• f. an upstanding cylindrical wall on said planar bottom member, spaced from and encircling said depending cylindrical wall portion of said rotor central hub;
• g. a core mounted on the outside surface of said upstanding cylindrical wall;
• h. an armature wound on said core and energizable by receiving electrical energy from wires passing to said armature through said aperture;
• i. a depending outer cylindrical wall on said rotor, spaced from and encircling said armature;
• and,
• j. a plurality of permanent magnets mounted on the inside surface of said rotor outer cylindrical wall proximate to and spaced from said armature in magnetic engagement, whereby said rotor rotates about said upstanding shaft and armature when said armature is energized.

A motor, suitable for driving a magnetic disk, an optical disk, or a magneto-optical disk, which comprises:

• a. a frame having a planar bottom member;
• b. an upstanding shaft on said planar bottom member, said upstanding shaft including a lower portion having a central bore and a post having upper and lower portions, and said post lower portion being secured within said central bore;
• c. an aperture in said planar bottom member;
• d. a core mounted on said upstanding shaft lower portion proximate said planar bottom member;
• e. an armature wound on said core and energizable by receiving electrical energy from wires passing to said armature through said aperture;
• f. a pair of spaced apart bearings mounted on said post upper portion above said armature;
• g. a cup shaped rotor mounted on said bearings to allow said rotor to rotate about said upstanding shaft and armature, said rotor having a cylindrical open bottom encompassing said armature, and said rotor including disk support means for mounting a disk on said rotor in a plane perpendicular to the axis of said upstanding shaft;
• and
• h. a plurality of permanent magnets mounted within said cup shaped rotor proximate to and spaced from said armature in magnetic engagement, whereby said rotor rotates about the upstanding shaft and armature when said armature is energized.

A motor, suitable for driving a magnetic disk, an optical disk, or a magneto-optical disk, which comprises:

• a. a frame having a planar bottom member;
• b. an upstanding shaft on said planar bottom member, said upstanding shaft including a lower portion having a central bore and a post having upper and lower portions, said post upper portion having a diameter greater than said post lower portion, said post lower portion being secured within said central bore, and said post upper portion being seated against the end of said shaft lower portion;
• c. an aperture in said planar bottom member;
• d. upper and lower spaced apart bearings mounted on said post upper portion proximate said planar bottom member;
• e. a cup shaped rotor having a central hub mounted on said bearings to allow said rotor to rotate about said upstanding shaft, said central hub including a depending cylindrical wall portion mounted on said lower bearing;
• f. an upstanding cylindrical wall on said planar bottom member, spaced from and encircling said depending cylindrical wall portion of said rotor central hub;
• g. a core mounted on the outside surface of said upstanding cylindrical wall;
• h. an armature wound on said core and energizable by receiving electrical energy from wires passing to said armature through said aperture;
• i. a depending outer cylindrical wall on said rotor, spaced from and encircling said armature;
• and,
• j. a plurality of permanent magnets mounted on the inside surface of said rotor outer cylindrical wall proximate to and spaced from said armature in magnetic engagement, whereby said rotor rotates about said upstanding shaft and armature when said armature is energized.