Patent ID: 8262551

Claim:
A centrifuge comprising: a rotor for separating samples; a motor for driving and rotating the rotor; a drive shaft for connecting together the motor and the rotor; a rotation sensor for detecting at least one of the rotation speed of the motor and the rotor; a displacement sensor for detecting a swinging amount of the rotor or the drive shaft; and a control unit for controlling a rotational speed of the motor, wherein the control unit comprises: first means for judging, after at least one of speed of the motor and the rotor is accelerated up to a previously set rotation speed, whether the swinging amount is more than a preset allowable value or not; second means for stopping the supply of power to the motor to decelerate the motor when the swinging amount is more than the preset allowable value; third means for accelerating the motor when the swinging amount is equal to or less than the preset allowable value; fourth means for repeatedly judging whether the swinging amount is more than the preset allowable value or not after decelerating or accelerating the motor; and fifth means for controlling the rotation of the motor based on the result of judging by the fourth means.