Patent ID: 7548034
Filing Date: 2009-06-16
Classification: B04B

Abstract:
1. A centrifuge comprising: a rotor rotating with a sample contained therein; a rotating shaft rotatably engaged with the rotor; a motor rotating the rotor and the rotating shaft; a belt transmitting rotational force of the motor to the rotating shaft; a rotor speed detecting unit that detects an actual rotation speed of the rotor and generates a first signal indicative of the actual rotation speed of the rotor; a motor speed detecting unit that detects an actual rotation speed of the motor and generates a second signal indicative of the actual rotation speed of the motor; and a control unit that receives the first signal and the second signal and produces an output signal indicative of a voltage applied to the motor, wherein the control unit includes: a target rotor rotation speed output unit that outputs a target rotor rotational speed in accordance with a setting value; a rotor speed difference calculating unit that receives the target rotor speed and the actual rotor rotation speed detected by the rotor speed detecting unit and calculates difference there between; and an application voltage calculating unit that receives the actual motor rotational speed detected by the motor speed detecting unit and the difference between the target rotor speed and the actual rotor rotation speed and calculates the voltage applied to the motor.