Device for monitoring the speed of rotation of an electric motor and centrifuging apparatus equipped with such a device
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United States of America Patent
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Aug 20, 2002
Grant Date -
N/A
app pub date -
Aug 23, 1999
filing date -
Aug 25, 1998
priority date (Note) -
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Abstract
This device for monitoring the speed of rotation of an electric motor (10) comprises a unit (16) for controlling the speed of rotation of the motor and a speed limitation unit (14) linked to the control unit (16) and including a processor (24) for comparing between at least one monitoring signal (S'; U.sub.PWM) representative of the speed of rotation of the motor imposed on the latter by the control unit (16) and a threshold value (V.sub.MAX) corresponding to the maximum value at which the motor (10) is permitted to operate, and a disconnection unit for at least temporarily disconnecting the motor (10) from its supply should the threshold value be exceeded. Prior to each startup of the motor (10), the control unit (16) carries out a phase of testing the correct operation of the speed limitation unit (14) by generating a monitoring signal (S') corresponding to a speed of rotation value greater than the threshold value. clean paragraphs
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