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US 6,476,528 B2Granted
Spindle motor rotor, index signal output device, and floppy disk drive having the same
AssigneeAlps Electric Co., Ltd.
InventorMikio Sekine
Life of this patent
Estimating the term…
Abstract
A spindle motor rotor having windows at plural place in a flange of a rotor yoke of a spindle motor; as well as projections producing outwards through the windows, integrally provided in some areas of a ring rotor magnet fitted to the inner circumference of the flange, wherein the rotor magnet is joined to the rotor yoke by welding these projections and one of the projections stretches over both an N pole and an S pole of the rotor magnet.
Claims8
A spindle motor rotor having:
- windows at plural places in a ring flange of a disc rotor yoke of a spindle motor;
- and
- projections, integrally provided in some areas of a ring rotor magnet fitted to the inner circumference of the flange, which protrude outwards through the windows,
- wherein the rotor magnet is joined to the rotor yoke by welding these projections and one of the projections stretches over both an N pole and an S pole of the rotor magnet.
1 more element
A spindle motor index signal output device having:
- windows at plural places in a ring flange of a disc rotor yoke of a spindle motor;
- projections, integrally provided in some areas of a ring rotor magnet fitted to the inner circumference of the flange, which protrude outwards through the windows, the rotor magnet being joined to the rotor yoke by welding these projections and one of the projections stretching over both an N pole and an S pole of the rotor magnet;
- and
- a magnetic flux detector for detecting a magnetic flux from each of the projections, located opposite to the outer circumference of the flange.
1 more element
A floppy disk drive having:
- a spindle motor rotor having:
- windows at plural places in a ring flange of a disc rotor yoke of a spindle motor;
- and
- projections, integrally provided in some areas of a ring rotor magnet fitted to the inner circumference of the flange, which protrude outwards through the windows, the rotor magnet being joined to the rotor yoke by welding these projections, and one of the projections stretching over both an N pole and an S pole of the rotor magnet;
- and
- a stator which rotatably supports the rotor and has stator coils for giving a repulsive force to the rotor magnet.
3 more elements
A floppy disk drive having:
- a spindle motor rotor having:
- windows at plural places in a ring flange on a disc rotor yoke of the spindle motor;
- projections integrally provided in some areas of a ring rotor magnet fitted to the inner circumference of the flange, the projections protruding outwards through the windows;
- the rotor magnet is joined to the rotor yoke by welding the projections;
- and one of the projections stretches over both an N pole and an S pole of the rotor magnet;
- and
- wherein a magnetic flux detector for detecting a magnetic flux from each of the projections is located opposite to the outer circumference of the flange.
4 more elements
Dependencies are inferred from the claim text.