WESTCAR ROTOFLUID COUPLING

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United States

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START-UP WITH ROTOFLUID FLUID COUPLING
With a ROTOFLUID fluid coupling between the Motor and Driven Equipment or Machine the motor can start up directly and the starting torque
( Ca) is used solely to accelerate the rotor and primary part of the connected coupling.
Figure 2. shows the peak current of an electric motor directly connected to the load, with direct start-up, and start-up with a fluid coupling. The
dotted line shows the energy lost as heat during start-up without a fluid coupling.
In the first case, the peak current is 6 times the rated current, and continues to be high until the operating speed is reached.
With a ROTOFLUID fluid coupling, the peak current is high for only a few seconds ( the energy required to accelerate the rotor) and drops to
acceptable values throughout the process of reaching operating speed.
CHARACTERISTIC CURVES FOR START-UP WITH FLUID COUPLING
Figure 3. shows a characteristic torque curve for an electric motor, the stall curve of the fluid coupling and the slip curve at operating speed.
The fluid coupling allows the motor to reach 80-85% speed in a few seconds ( shift from point A to point B) where it meets the stall curve of the
fluid coupling ( slip= 100% ) , the point of maximum motor torque.
Point C is the point of functioning of the fluid coupling after the motor has reached operating speed.
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Call: PT SARANA TEKNIK INDUSTRI
Email: saranagroup@ cbn.net.id

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