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The rotary vane unit illustrated compiler with the. IMO Rules for oil tankers greater than 100000 tonne dwt. Having 2 separate, independent power actuating systems. The two actuators act simultaneously for normal operation, but if loss of hydraulic pressure id detected, they are isolated by automatic hydraulic values and the intact actuator will remain fully operative at 50% of the maximum torque. The rotary vane unit is enclosed by a heavy casing bolted down on to the seating. At the based the rotary vane unit is a thrust ring which will support the load from the rudder that is transmitted from the tapered stock via a hydraulic nut onto the rotary vane.
In the case of the unit illustrated, the rotor has resilient seals at the top and bottom of the vanes which accommodates small vertical movement by wear down, or the rudder lifting through the jumping clearance when pitching. An alternative method is for the rotary vane to be mounted in anchor brackets with anchor bolts.
Answered by DieselShip
8 months ago0 0 -
Starting torque is
Torque is very sensitive to voltage 4 change in 5% of supply voltage will produce a change of approximately 10% in the rotor torque.
Rotor reactance (x2) / phase [x2 = 2 f L] varies with frequency
Frequency of supply
Resistance of rotor phase
The starting torque is normally 1.5 times the full load / rotor torque
Answered by Albert
8 months ago0 0
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