(57) A device for controlling and regulating the relative speed between the scroll (4)
and drum (2) of a centrifugal extractor, comprising a dc or ac electric motor (10),
stator (10a) of which is made integral with drum (2) and rotor (10b) of which is made
integral with a gear (7) which drives scroll (4) via appropriate means (7a, 8a, 14a;
7b, 8b, 14b) of connection, there being furthermore provided means (30a, 30b) for
detecting the speeds of rotation of such rotor (10b) and stator (10a) and for converting
them into a representative electric signal, and means (40, 50) for comparing such
electric signals designed to emit a signal (Drs) capable of operating means (60; 1060) for supplying to rotor (10b) a current capable
of compensating for any deviations of the parameters of the extractor from the programmed
operating conditions.
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