Centrifuge having displacement sensor

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.