PURPOSE: To suppress the deflection of a shaft at the time of passing the primary resonance region, to prevent the bending of the shaft, to stabilize an accelerating control and to improve reliability in the accelerating control of a centrifugal separator.
CONSTITUTION: In the centrifugal separator provided with the controlling part controlling the rotor 2 for centrifuging a sample, the motor 3 for driving a rotor 2 through a thin shaft 8, the sensor 4 for detecting the rotation of the motor 3, and the operating part 6 setting and displaying operational conditions, at the time of the accelerating control of the motor 3, a motor current is increased temporarily just before rotation passes the primary resonance region to change an accelerating gradient, and the deflection of the shaft 8 at the time of passing the primary resonance region is suppressed and the bending of the shaft 8 is prevented, and stable acceleration control is executed.
SAGAWA NORIHISA
HAYASAKA HIROSHI
OOYAMA HISANOBU
