In order to operate a ship reception chamber synchronously (including electrical synchronization), smoothly and safely, the output shafts of reduction gearboxes at four lifting points should be connected to a closed rectangular shaft system which constitutes mechanical rigid synchronous system.
To ensure power equilibrium, make sure torque outputs of drive motors for the mechanical synchronous drive system remain the same. It is important that the synchronous transmission shaft does not suffer excessive torque and rupture.
When a winch motor fails, the other three winch motors will supplement power to the failed lifting point via synchronizing shaft system immediately in order to ensure normal operation of the main hoist. Synchronizing torque shafts is monitored and reflects the power allocation.
In order for the ship to avoid sinking or floating when the brake releases, the drive system will generate a certain torque output in advance according to unbalanced force and its direction between the ship reception chamber and the balancing weight.