Electricity: motive power systems – Positional servo systems
Reexamination Certificate
2007-01-30
2007-01-30
Ip, Paul (Department: 2837)
Electricity: motive power systems
Positional servo systems
C318S561000, C318S608000, C318S632000, C369S047360, C369S047360
Reexamination Certificate
active
11312052
ABSTRACT:
A method and apparatus for compensating for the asymmetrical phases of a spindle motor in a disc drive are provided. With the apparatus and method, compensation values are learned by sampling speed data during a period of operation of the disc drive where the speed is stable and only one control operation is performed per revolution of the disc. The sampled speed data is used to generate the compensation values for each of the phases of the spindle motor. The compensation values are stored in a compensation mechanism which is used by the spindle motor speed controller to provide compensation for the asymmetrical phases of the spindle motor. During Normal operation, the actual speed output of the spindle motor is measured and is subtracted from a reference speed to generate a difference speed value. Based on the corresponding electrical phase, the correct compensation value is fetched and is subtracted from the difference speed value to obtain a compensated difference speed value. A control signal based on this compensated difference speed value is generated and provided to the spindle motor to thereby control the output speed of the spindle motor.
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Ang June Christian
Chiang WingKong
Ding MingZhong
Ooi KianKeong
Ip Paul
Seagate Technology LLC
Westman Champlin & Kelly
LandOfFree
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