Optimal Generation of Output Torque for Industrial Motors using Variable Frequency Drive and Gearbox Drive

Abstract

This paper depicts the exploration of output torque of Gear reduction drive and variable frequency drive (VFD) with detailed analysis report for the various load conditions. The right selection of VFD will depend on the load requirement and application. The higher the load therefore more torque needed in an application, the higher the current draw of the motor will be. Since VFDs are rated by their continuous output current (amps), it is important to select a drive with adequate current to the motor for optimal performance. The property of Torque is converse effect of gear reduction. By means of gear ratio, the output torque is increased by developing the torque with reduced efficiency losses. On the other hand, in some applications the gear reduction play a vital role in reduces the speed while increase the torque and in many other applications it uses to increase speed with reduced torque. In recent era, many industrial drives are designed as such that to run at 60% to 100% of rated load. In this scenario the drive would get optimum efficiency is generally obtained nearly 75% of rated load. Thus, a 20 horsepower (HP) electric drive has a satisfactory load range of 12 to 20 HP with optimum efficiency is at 7.5 HP. A motor’s efficiency tends to decrease dramatically below about 50% load. Hence it’s very important to choose the drive for the proper application with different loading conditions.