FNCT Fluid Couplings working on principle of hydrodynamic power transmission with fill control are ideal as startup and acceleration control equipment's for large drive motors. Combined with electronic control they provide additional safety to drive motors and torque transmission control.
The Impeller (Pump) and Rotor (Turbine) enclosed in a primary casing have another casing (secondary). A fixed position Scoop Tube is provided to continuously collect the oil released by leak off nozzle from working circuit. The Impeller and Rotor are connected by shafts for onwards connection to motor and driven machine shaft through suitable flexible couplings. The shafts rest on ball and roller bearings on suitable bearing housings. The whole rotating assembly is housed in a robustly built stationary self supported housing of welded construction. A motor driven oil pump is provided to circulate working oil through the oil circuit of FNCT Coupling. Two No. solenoid valves and Two No. non return valves are provided which control oil level into the FNCT working circuit. A lube line branching out from pump outlet continuously feeds oil to bearings irrespective of oil level in working circuit
The circulating oil pumped by motor driven oil pump flows into the working circuit of fluid coupling through an oil collection ring and then into the working circuit. The leak off nozzle continuously drains oil from working circuit into the secondary casing from where it is collected by the fixed position scoop tube. This oil passes through an oil cooler and gets re-circulated into the working circuit of fluid coupling (achieved by solenoid valve operation) without flowing back into oil tank or flows back into oil tank for declutching or acceleration control. Any desired oil level between complete empty 0% to complete full 100% of working circuit can be achieved by adding or removing oil from working circuit by operation of solenoid valve. The torque transmitted by the coupling depends on oil level in the working circuit and thus the torque transmission during starting or running can be controlled resulting into several advantages. For declutching of coupling at any time during operation the complete circuit can be emptied by operation of solenoid valves. During machine acceleration control the oil level in working circuit can continuously be adjusted i.e. increased or decreased by operation of solenoid valves through an electronic control which monitors motor power and machine speed.
No load start up of drive motor thus faster decay of starting current and improved and reliable motor protection.
Applications : The FNCT couplings can be used in variety of applications as a startup duty and controlled and smooth acceleration of heavy masses and inertia. Ideally suited for Belt and Pipe Conveyor application.
Typical applications include :
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