Motor controller and disk drive unit

Details Motor controller and disk drive unit Motor controller and disk drive unit

1997-07-29

1999-11-30

Nappi, Robert E.

Electricity: motive power systems

Positional servo systems

Frequency- or phase-modulated systems

388805, G05B 102

Patent

active

059948663

ABSTRACT:
A motor having enhanced transient characteristics during the acceleration time of the motor in a disk unit. The motor includes a motor controller having a phase-locked loop (PLL) or frequency-locked loop (FLL) for controlling the speed of a spindle motor in a disk drive. The PLL or FLL is coupled to a digital filter. The difference between a phase or frequency synchronized with the rotational speed of the motor and a target value is received by the digital filter. The digital filter output is added to the target value. The sum of the filter output and the target value is set in the PLL or FLL as an adjusted target value to perform PLL control or FLL control. With this arrangement, the time to shift from a low-speed rotation state to a high-speed rotation state can be shortened.

REFERENCES:
patent: 4599545 (1986-07-01), Moriki et al.
patent: 4739230 (1988-04-01), Sonobe et al.
patent: 5223772 (1993-06-01), Carbolante
patent: 5543697 (1996-08-01), Carbolante et al.
Proposition of Minimum Stead-State Dispersion Method, Shingagku Theory A, J76-A. No. 3, pp. 364-371, Mar. 1993.

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