Traction Drives

Diesel Electric Traction System

Diesel Electric Traction System: Because of high initial cost, electric traction is justified only where there is sufficient volume of traffic. Diesel Electric Traction System is preferable where the traffic is limited. Boundary between these two alternatives depends on several factors such as initial cost, running cost, amount of traffic, maintenance etc. Diesel Electric Traction …

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Load Commutated Inverter Fed Synchronous Motor Drive

Load Commutated Inverter Fed Synchronous Motor Drive: Load Commutated Inverter Fed Synchronous Motor Drive is shown in Fig. 10.22. The inverter is a current source inverter employing thyristors T1 – T6. The commutation of inverter thyristor is done by the voltages induced in armature of the synchronous motor. A chopper is used to obtain a variable dc …

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Polyphase AC Motors for Traction Drives

Polyphase AC Motors for Traction Drives: Polyphase AC Motors for Traction Drives – Advantages of ac motors over dc we already know. Because of negligible maintenance, ruggedness and higher power per unit weight or volume, the squirrel-cage induction motor is ideally suitable for traction applications. Because of higher efficiency, and simpler and cheaper inverter, compared …

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DC Traction

DC Traction using Semiconductor Chopper Controlled DC Motors: Chopper control has replaced resistance control in all dc traction schemes, such as 1500 V dc main line and suburban traction, 750 V dc underground traction and electric buses. The chopper control has following additional advantages over the resistance control: Regenerative braking can be carried out almost …

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Semiconductor Converter Controlled Drives

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are now widely used both in ac and dc tractions involving dc and ac motors, and the conventional drives have all become outdated, and will be phased out in near future.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

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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