Centrifuge having rotor and cooling device for cooling rotor

A centrifuge comprising:

• a motor;
• a rotor mounted on a rotating shaft of the motor;
• a rotor chamber accommodating the rotor;
• a cooling device including a variable-speed-controllable compressor set with an upper-limit rotation frequency and a lower-limit rotation frequency and cooling the rotor chamber;
• an inputting unit inputting operation conditions including setting temperature and setting rotation speed of the rotor;
• a temperature measuring unit measuring ambient temperature of the centrifuge;
• and
• a control device controlling operation of the motor and the cooling device, wherein
• the control device sets a switch temperature Tm for switching the upper-limit rotation frequency,
• the upper-limit rotation frequency is set to have a constant value when the measured ambient temperature is lower than or equal to the switch temperature Tm, and
• the upper-limit rotation frequency is decreased from the constant value when the measured ambient temperature exceeds the switch temperature Tm.