Electricity: motive power systems – Open-loop stepping motor control systems
Patent
1988-11-04
1990-04-03
Shoop, Jr., William M.
Electricity: motive power systems
Open-loop stepping motor control systems
318685, 360 39, 360 7813, H02P 800
Patent
active
049143697
ABSTRACT:
A drive system for a double-sided floppy disc includes a head for each side of the disc, a stepper motor responsive to stepper motor control signals for moving the heads to predetermined tracks on the floppy disc, and a control circuit for generating the stepper motor control signals in response to commands from the computer. The tracks on the floppy disc are disposed with the first "n" tracks on one side of the floppy disc and the "N+1"st track and remaining tracks on the other side. The "n"th and "n+1"st tracks are disposed adjacent each other along a boundary of the disc but on opposite sides of the disc. The control circuit generates a first predetermined sequence of stepper motor control signals to move the first head in the direction from the preceding tracks toward the "n"th track and a second predetermined sequence of stepper motor control signals to move the second head in the direction from the "n+1"st track to succeeding tracks. The second predetermined sequence of stepper motor control signals is derived from the first predetermined sequence.
REFERENCES:
patent: 4145644 (1979-03-01), Liu
patent: 4459527 (1984-07-01), Hayman
patent: 4622603 (1986-11-01), Mizunuma
patent: 4631466 (1986-12-01), Sherwin
patent: 4644418 (1987-02-01), Banns et al.
Bergmann Saul M.
Shoop Jr. William M.
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