Patent ID: 6866621

Claim:
A laboratory centrifuge with a rotor ( 2 ) driven by a centrifuge electric motor ( 5 ) and a cooling unit ( 17 ) driven by an electrical cooling motor ( 22 ), wherein the centrifuge motor ( 5 ) is formed as a frequency-controlled induction motor fed from a frequency converter ( 20 ) controlled by a control unit ( 30 ) and having a centrifuge inverted rectifier ( 7 ) that feeds the centrifuge motor ( 5 ) and is connected to a d.c. source ( 10 ) fed from a mains power rectifier ( 12 ), characterized in that the cooling motor ( 22 ) is formed as a frequency-controlled induction motor, and that the frequency converter ( 20 ) for feeding the cooling motor ( 22 ) has a further cooling inverted rectifier ( 24 ) connected in parallel with the centrifuge inverted rectifier ( 7 ) to the d.c. source ( 10 ).