Types of Power Transmission Drives: Mechanical power available at the motor shaft has to be transmitted to the driven machine or machines. Various types of power transmission drives are namely, Direct Drive Belt Drives Rope Drive Chain Drive Gear Drive Vertical Drive 1. Direct Drive In this types of power transmission drives, the driving member […]
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Types of Electric Drives: The various types of electric drives used in industry may be divided into three types, namely Group Drive, Individual Drive and Multi-motor drives. 1. Group Drive: By group drive is meant a drive in which a single electric motor drives a line shaft by means of which an entire group of
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Electric Drives Interview Questions and Answers: 1. What is an electric drive ? Ans. An electric drive is defined as a form of machine equipment designed to convert electrical energy into mechanical energy and provide electrical control of this process. The basic elements of an electric drive are the electric motor, the transmission, and the
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Performance of Long Transmission Lines Interview Questions and Answers: 1. What is the range of surge impedance for an overhead transmission line ? Ans. 400-600 Ω. 2. What is the range of surge impedance in case of underground cables ? Ans. 40-60 Ω. 3. Explain surge impedance loading of a transmission line. Ans. Surge impedance
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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
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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
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Semiconductor Converter Controlled Drives: These are now widely used both in ac and dc tractions involving dc and ac motors, and the conventional drives have all become outdated, and will be phased out in near future. The Semiconductor Converter Controlled Drives have several advantages. Some of their common advantages are listed below: High efficiency. Low
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Conventional DC and AC Traction Drives: The commonly used Conventional DC and AC Traction Drives are The dc Traction Drives Employing Resistance Control: The dc traction drives employing resistance control are: 1500 V dc traction on Bombay-Igatpuri-Pune section for main line and Bombay suburban 750 V dc traction in underground trains at Calcutta. 550 V
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Features of Traction Drives: Various Features of Traction Drives are: 1. Large torque is required during start and acceleration in order to accelerate the heavy mass. 2. The motor is subjected to torque overloads during acceleration and when negotiating up gradients. 3. Because of economic reasons single phase supply is used in ac traction. Indian
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Traction Drive Rating and Energy Consumption: Traction Drive Rating and Energy Consumption – The speed-time curve of Fig. I0.6(a) is reproduced in Fig. 10.9. For simplification in calculations, it is approximated by a trapezoidal curve having constant values for acceleration and deceleration. As the area beneath curve represents distance covered, the area of trapezoidal curve
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