Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Disk record
Patent
1987-10-30
1989-08-15
Wolff, John H.
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Disk record
310268, 318254, G11B 1700, H02K 300, H02P 700
Patent
active
048580449
ABSTRACT:
A disc drive spindle motor having a stator with nine evenly distributed windings separated by relatively large slot openings, further comprises a rotor having a radially polarized eight-pole magnet. The motor of this invention has three phases, the first phase starting at any winding end of the nine windings and incorporates the windings n, n+2 and n+4 connected in series and being wound in the same direction; the second phase starting at the winding n+3, and incorporating the windings n+5 and n+7 connected in series and being wound in the same direction; and the third phase beginning with the winding n+6 and incorporating the windings n+8 and n+1, connected in series and wound in the same direction. The starting points of the three phases are selected to provide the necessary 120.degree. phase shift between windings.
REFERENCES:
patent: 4528485 (1985-07-01), Boyd, Jr.
patent: 4535276 (1985-08-01), Yokobori
patent: 4578606 (1986-03-01), Welterlin
patent: 4605874 (1986-08-01), Whiteley
patent: 4626727 (1986-12-01), Janson
patent: 4633149 (1986-12-01), Welterlin
patent: 4707645 (1987-11-01), Miyao et al.
Seagate Technology Inc.
Wolff John H.
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