Electricity: motive power systems – Positional servo systems – Digital or numerical systems
Patent
1999-04-19
2000-12-26
Ip, Paul
Electricity: motive power systems
Positional servo systems
Digital or numerical systems
318560, 318605, 318608, 369 50, 369 59, H02P 517
Patent
active
06166507&
ABSTRACT:
In a disk drive system, whether the rotation rate of a motor provided to drive a disk is within a rated rotation rate range or not is checked every time the motor makes one complete turn. When the rotation rate of the motor is found to be within the rated range a predetermined number of times consecutively, a status signal, which is used to indicate that the rotation rate of the disk is within the rated range, is brought into a state for indicating that the rotation rate of the disk is within the rated range. This not only prevents the status signal from oscillating at a high frequency, but also allows the status signal to be brought into the state for indicating that the rotation rate of the disk is within the rated range only after the rotation rate of the motor has settled within the rated range. Thus, it is possible to eliminate the possibility of malfunctioning of a disk drive apparatus due to the status signal.
REFERENCES:
patent: 4959733 (1990-09-01), Miura et al.
patent: 5193146 (1993-03-01), Kohno
patent: 5856962 (1999-01-01), Inagawa et al.
patent: 5856963 (1999-01-01), Inagawa et al.
patent: 5878007 (1999-03-01), Matsumoto et al.
Ip Paul
Rohm & Co., Ltd.
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