Energy Conservation in Electrical Drives:

Application of Variable Speed Drives : Several drives are driven at constant speeds by induction or synchronous motors, although operation of Application of Variable Speed Drives could lead to saving of substantial amount of energy. Such practice was adapted in the past because of nonavailability of efficient methods of speed control of induction and synchronous motors. One prominent example of such a case is pump drives where fluid flow control is …


Energy Efficient Operation of Drives : In many Energy Efficient Operation of Drives applications involving constant speed operation, induction motors operate under no load or light load for prolonged periods, such as in pressing machine, conveyors, rock crushers, centrifuges, drill presses, wood saw and, some machine tools. In such applications, saving in energy can be achieved by operating the motors at low voltages while running at no load and …


Energy Losses in Electrical Drive System : Energy conservation in electrical drive is achieved by reduction of losses in its various parts. Typical Energy Losses in Electrical Drive System include the following: 1. Electrical transmission losses: These losses depend on the drive power factor and harmonics in the line current. 2. Conversion losses in the power modulator (or converter): The semi-conductor converter usually has low conversion losses. 3. Electric motor losses to …


Measures for Energy Conservation in Electrical Drives : Following Measures for Energy Conservation in Electrical Drives: Use of efficient semiconductor converters. Use of efficient motors. Use of variable speed drives. Energy efficient operation of drives. Improvement of power factor. Using a motor of right rating. Improvement of quality of supply. Use of single- to three-phase semiconductor converters in rural applications. Regular and preventive maintenance of motors, transformers and coupled equipment. …


Power Factor Improvement Methods : There are many drives which operate at a low power factor. Some of Power Factor Improvement Methods are: An induction motor direct on line. ac-dc diode rectifier and line commutated thyristor converter fed dc motor and variable frequency ac motor drives. ac regulator fed induction motor drives. Induction motor drive with slip power recovery. Due to wide spread use of these drives, Power Factor Improvement Methods has become an …


Use of Efficient Semiconductor Converters : Prior to development of Use of Efficient Semiconductor Converters, inefficient power modulators were employed in several applications. While replacement of these power modulators by the semiconductor converters in appropriate applications brings about substantial amount of energy saving, the cost of replacement can be recovered in a short period ranging from one to five years, depending on the applications. Some cases are considered here. Replacement …


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