Storage device and motor control device
AssigneeFujitsu Limited
InventorsHiroshi Oyabu, Takao Abe, Tetsuya Tabuchi
Life of this patent
Estimating the term…
Abstract
In a storage device, a BEMF control is not performed on a motor and the motor is stopped if the motor is in a BEMF-control possible state. Once the motor has completely stopped, a start-up control is performed on the motor.
Claims8
A storage device that controls a motor of a storage medium to perform a start-up control to rotate the storage medium from a non-rotating state and perform a BEMF control to speed up rotation of the storage medium, the storage device comprising:
- a receiving unit configured to receive a command to drive the storage medium;
- a rotation determining unit that determines, when the receiving unit receives the command, whether the motor is in a BEMF-control possible state;
- a BEMF control unit that performs the BEMF control on the motor when the rotation determining unit determines that the motor is in the BEMF-control possible state;
- a brake control unit that performs a brake control to stop the motor by sending a brake signal to the motor when the rotation determining unit determines that the motor is not in the BEMF-control possible state;
- and
- a start-up control unit that performs the start-up control on the motor by sending a start-up signal to the motor after the motor has stopped due to the control of the brake control unit.
A motor control method of controlling a motor of a storage medium to perform a start-up control to rotate the storage medium from a non-rotating state and perform a BEMF control to speed up rotation of the storage medium, the motor control method comprising:
- receiving a command to drive the storage medium;
- determining, when the command is received at the receiving, whether the motor is in a BEMF-control possible state;
- performing the BEMF control on the motor when it is determined at the determining that the motor is in the BEMF-control possible state;
- performing a brake control to stop the motor by sending a brake signal to the motor when it is determined at the determining that the motor is not in the BEMF-control possible state;
- and
- performing the start-up control on the motor by sending a start-up signal to the motor after the motor has stopped due to the performing of the brake control.
Dependencies are inferred from the claim text.