Device for monitoring the speed of rotation of an electric motor and centrifuging apparatus equipped with such a device
First Claim
1. A device for monitoring the speed of rotation of an electric motor, said device comprising a control unit for controlling the speed of rotation of the motor and a speed limitation unit, the control unit comprising generating means for generating at least one control signal for controlling the speed of rotation of the rotor, the speed limitation unit being linked to the control unit and including means for comparing at least one monitoring representative of the speed of rotation of the motor imposed on the latter by the control unit through the at least one control signal and a threshold value corresponding to the maximum value at which the motor is permitted to operate, the device further comprising first disconnecting means for at least temporarily disconnecting the motor from its supply should the threshold value be exceeded, characterized in that prior to each startup of the motor, the control unit carries out a test phase for testing the correct operation of the speed limitation unit in which test phase the generating means generates at least one control signal corresponding to a speed of rotation value greater than the threshold value.
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Accused Products
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′; UPWM) representative of the speed of rotation of the motor imposed on the latter by the control unit (16) and a threshold value (VMAX) 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
23 Citations
8 Claims
- 1. A device for monitoring the speed of rotation of an electric motor, said device comprising a control unit for controlling the speed of rotation of the motor and a speed limitation unit, the control unit comprising generating means for generating at least one control signal for controlling the speed of rotation of the rotor, the speed limitation unit being linked to the control unit and including means for comparing at least one monitoring representative of the speed of rotation of the motor imposed on the latter by the control unit through the at least one control signal and a threshold value corresponding to the maximum value at which the motor is permitted to operate, the device further comprising first disconnecting means for at least temporarily disconnecting the motor from its supply should the threshold value be exceeded, characterized in that prior to each startup of the motor, the control unit carries out a test phase for testing the correct operation of the speed limitation unit in which test phase the generating means generates at least one control signal corresponding to a speed of rotation value greater than the threshold value.
Specification