| 摘要 |
A control method for a rotation speed is used in an optical disc drive. When the angular velocity of the optical disc in rotation is fixed and the rotation direction is the same as the direction of the torque, then a breaking torque, having the same magnitude as the rotational torque but in the opposite direction, is applied to cause the rotation of the optical disc to cease. In other situation, a fixed rotational torque of the same magnitude as that of the angular velocity is first applied to cause the optical disc to have a fixed angular velocity. Then, a breaking torque having the same magnitude as the fixed rotational torque but in the opposite direction is applied to cause the rotation of the optical disc to cease. In this manner, no matter what rotation speed of the optical disc is, the rotation of the optical disc can always be ceased by a fixed period of time.
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