Electricity: motive power systems – Switched reluctance motor commutation control
Patent
1998-11-19
1999-10-12
Nappi, Robert E.
Electricity: motive power systems
Switched reluctance motor commutation control
318561, 318109, 360 75, H02K 2300
Patent
active
059659920
ABSTRACT:
A disk drive is connectable to a power supply having a fixed DC voltage. The disk drive includes a voice coil motor. The fixed DC voltage is supplied to a first node. A capacitor is coupled between the first node and a second node and is charged to approximately the fixed DC voltage by grounding the second node while the disk drive performs a track following operation. The DC voltage of the first node is increased to an increased DC voltage greater than the fixed DC voltage by providing the fixed DC voltage to the second node while to the disk drive performs a track seeking operation. The first node is de-coupled from the fixed DC voltage while the DC voltage of the first node is greater than the fixed DC voltage. The DC voltage of the first node is provided to the voice coil motor. The increased VCM voltage allows faster access times and more efficient VCM operation.
REFERENCES:
patent: 5631527 (1997-05-01), Canckini
patent: 5633568 (1997-05-01), Dunfield
patent: 5778885 (1998-07-01), Doyama et al.
patent: 5844743 (1998-12-01), Funches
Goretzki Jerome A.
Hussein Hakam D.
Leykin Rita
Nappi Robert E.
Shara, Esq. Milad G.
Western Digital Corporation
Young, Esq. Leo J.
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