Patent ID: 11958063
Assignee: KUBOTA MANUFACTURING CORPORATION
Field: Chemical engineering (Chemistry)
Classification: CPC B | IPC B

Claim 0:
1. A centrifuge comprising:
a rotor;
a driving source that rotates the rotor;
a rotating shaft that links the rotor with the driving source;
an acceleration sensor that outputs a value indicating acceleration in at least two different directions which are orthogonal to an axial direction of the rotating shaft; and
a control unit that obtains a displacement-conversion value corresponding to a value, the value being obtained by dividing a value which is proportional to acceleration based on a value indicating acceleration and outputted by the acceleration sensor, by a value which is proportional to a square of an angular velocity of the rotor, and that stops rotation of the rotor when the displacement-conversion value satisfies a displacement determination criterion which is predetermined and indicates that displacement is large, wherein
a range that corresponds to an angular velocity at which displacement of the rotating shaft of the rotor increases due to resonance is defined to be a resonance range,
the control unit obtains the displacement-conversion value when an angular velocity of the rotor is in a predetermined range of an angular velocity, the predetermined range being below the resonance range, so as to confirm whether the displacement-conversion value satisfies the displacement determination criterion, and
a case of the displacement-conversion value, the displacement-conversion value being smaller than a maximum displacement conversion value in the resonance range in allowable maximum imbalance, is included in a range satisfying the displacement determination criterion.