Faster spin-down operation in a disk drive by utilizing pulsed b

Details Faster spin-down operation in a disk drive by utilizing pulsed b Faster spin-down operation in a disk drive by utilizing pulsed b

1998-06-22

2000-12-12

Nappi, Robert E.

Electricity: motive power systems

Braking

Dynamic braking

318372, H02P 312

Patent

active

061603686

ABSTRACT:
A disk drive includes a spindle motor having windings and a spindle motor driver including switching elements connected to the windings. Spin-down instructions are stored in a memory. A microprocessor is responsive to a spin-down command to receive and execute the spin-down instructions. The execution of the spin-down instructions causes the microprocessor to perform the following pulsed braking sequence: (1) providing a brake signal for a first selected period of time (T1); (2) providing a coast signal for a second selected time period (T2); and (3) repeating (1) and (2). The spindle motor driver is responsive to the coast signal to control the switching elements to cause the spindle motor to coast and is responsive to the brake signal to control the switching elements to brake the spindle motor. The pulsed braking sequence preferably maximizes braking time and minimizes coasting time to reduce the time it takes to spin-the down spindle motor while still preventing heat related breakdown of components in spindle motor and power FETs in the spindle motor driver.

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patent: 5821717 (1998-10-01), Hassan et al.
patent: 6021015 (2000-02-01), Jeffrey et al.

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