| US 7,456,595 B2 | ||
| Method and apparatus for adaptive control of a disk drive in the presence of non-linear magnetic bias | ||
| Ryan Todd Ratliff, O'Fallon, Mo. (US); and Prabhakar R. Pagilla, Stillwater, Okla. (US) | ||
| Assigned to The Board of Regents for Oklahoma State University, Stillwater, Okla. (US) | ||
| Filed on Apr. 18, 2006, as Appl. No. 11/406,177. | ||
| Claims priority of provisional application 60/672351, filed on Apr. 18, 2005. | ||
| Prior Publication US 2007/0007921 A1, Jan. 11, 2007 | ||
| Int. Cl. G05B 11/01 (2006.01) | ||
| U.S. Cl. 318—560 [318/432; 318/434] | 17 Claims |
| 1. A method of moving a disc drive arm in a nonlinear magnetic field, wherein is provided at least one disk drive arm physical
parameter, comprising the steps of:
(a) determining a torque bias of said disc drive arm within said magnetic field;
(b) selecting a functional form, said functional form having at least one parameter associated therewith;
(c) determining a value for each of said at least one parameters of said functional form, said functional form at least approximately
representing said torque bias when said determined parameter values are substituted for each of said at least one parameters;
(d) determining a control law using at least said functional form, said determined parameter values of said parameters, and
said at least one disk drive arm physical parameters; and,
(e) moving said disc drive arm within said nonlinear magnet field according to said determined control law.
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