Motor construction and method for limiting spin-up time in a har

Details Motor construction and method for limiting spin-up time in a har Motor construction and method for limiting spin-up time in a har

1991-04-30

1993-06-01

Ip, Paul

Electricity: motive power systems

Positional servo systems

Program- or pattern-controlled systems

318 64, 318 82, 318 94, 318122, 318724, 318785, 318431, 318501, 318502, H02P 116, H02P 712

Patent

active

052163431

ABSTRACT:
A hard disk drive having a plurality of disks mounted on the rotor of a current limited, electronically commutated dc motor. Windings on the stator of the motor are divided into serially connected run and start sections and first and seconds drive circuits are provided to operate the motor by alternatively enabling the first drive circuit to pass currents serially through the two sections of the winding and enabling the second drive circuit to pass currents through only the run sections of the windings. During spin up of the disk drive to operating speed, the first drive circuit is enabled and the second drive circuit is disabled to drive the disks to the speed at which the back emf limits on the acceleration of the motor using both sections of the windings reduces the acceleration to the maximum acceleration achievable at the current limit using the run sections alone. Spin up is then completed by enabling the second drive circuit and disabling the first drive circuit.

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