To better understand what benefit a fluid coupling provides when connected between an electric motor and gear train, the speed and torque profile of the electric motor must be considered.
During start-up, an across-the-line started motor transmits torque to the drive system components. As shown in the graph, these values can range anywhere from 180 percent starting torque to 250 percent breakdown torque based on full load.
Severe damage may result to the connected equipment if less than 180 percent of full-load torque for starting is required because components in the drive train must absorb the additional load. Any number of components, from belts on a conveyor to bearings or rotating shafts and more, could fail as a result of "over-torquing."
If the load of gas air heater get over torque, fluid coupling will get high temperature and fuseplug will be broken to release hydraulic the pressure to preventive fluid caupling damage.
Picture above is how to oil fill of hydraulic coupling. A fluid coupling's fill also has a direct effect on the amount of "slip" that is developed. At full running speed, a fluid coupling will exhibit from one- to four-percent slip. Slip is expressed as the differential between input speed and output speed
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