Device for determining the resistive torque of a rotating item of equipment, system for monitoring the operation of an electric motor and system for regulating the operating parameters of a centrifuge incorporating such a device
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United States of America Patent
Stats
-
Mar 20, 2001
Grant Date -
N/A
app pub date -
Sep 26, 1997
filing date -
Sep 27, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A device for determining the resistive torque of an item of equipment driven by an asynchronous electric motor operated by a control unit delivering to the motor an alternating voltage for controlling the rotational speed of the motor includes a measuring unit for measuring the rotational speed, a calculator for calculating the motor slip from the said rotational speed and the synchronous speed of the magnetic field generated by the power-supply voltage and a comparator for comparing the calculated value of slip and a set of predetermined slip values each corresponding to a resistive torque value, so that the resistive torque of the item of equipment can be determined.
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