Whitepaper | Electrical Traction Control using PWM and IGBT Technology

In recent years the importance of environmental problems has increased. Because of this electrical traction has replaced the internal combustion engine for mass transit systems. At first DC locomotives were used but they have many drawbacks, such as commutation, sparks on the brushes and difficulty in maintenance. However dc motors have now been replaced by 3-phase squirrel cage induction motors. To allow speed control the dc bus bar is available (+750Vdc) with a digital inverter built into the train. Pulse width modulation (PWM) is commonly used to convert a dc voltage to three symmetrical ac components. Moreover the GTO thyristors is changed to an Insulated Gate Bipolar Transistor (IGBT Technology) for its many advantages. Most metro systems in the world now use this approach. In this paper the mathematical modelling and simulation results are presented and commented on.


The population of big cities needs major projects to solve their transp


Mumbai Metro | Night ban on Metro 3 might cause Rs 6,100 crore loss annually

Mumbai: Restriction placed by Bombay High Court on Mumbai Metro work on Metro 3 might lead to an estimated loss of Rs 6,100. As per the orders metro work cannot be carried out from 10 pm to 6am – the ban is on late night construction. This ensued after a complaint from Cuffe Parade residents.

The ban has resulted in a loss of nine-month delay in work. The officials feel that if the ban is imposed for three more months, the project is likely to run in losses.  A projected annual loss comes around Rs 6,133 crore to the economy as per the experts associated with underground Mumbai Metro rail project.

As per the plan the Colaba-bandra-Seepz Metro 3 corridor construction comes to over Rs 23,000. The project is taken by Mumbai Metro Rail Corporation (MMRC).

The website of MMRC sh


Mumbai Metro | Core activities to be in-house assert authorities

Mumbai: The Mumbai Metropolitan Region Development Authority (MMRDA) is exploring possibility of keeping maintenance and operating activities in-house.  The authorities feel that it would be easier to manage things if all of it is managed internally for Mumbai Metro.

MMRDA that is constructing all metros in the city might not hire external contractors for operation and maintenance of metros. Usually all the public projects it handles like building roads, bridges and other works are handed over to local bodies post completion. But with metros MMRDA is looking to manage things in-house.

As per senior officials from MMRDA, they will be starting recruitment process to hire people to operate and maintain metros. They shared that the country has sufficient talent to ope


Lucknow Metro | LMRC to complete special cantilever span over Gomti River by September


  • Lucknow Metro set target to install special cantilever span over Gomti Nagarby September this year.
  • Construction of special span of 180 meters is started between Indira Nagar Metro Station and Munshipulia.
  • The construction work for the stairs at all metro stations are in full pace whereas on other side the construction work for concourse area’s base slab of all metro stations are completed.

New Delhi: The Lucknow Metro Rail Corporation (LMRC) today informed that the LMRC  Managing Director, Kumar Keshav reviewed the development progress of Metro construction work on the North-South Corridor of Section (1B). The contractors were also accompanied with him during the entire inspection. He first oversaw the ongoing construction work of KD Singh Metro Station which will be the first metro station of this secti


Delhi Metro | Finance ministry approves Phase IV project of DMRC

New Delhi: Under the fourth phase of Delhi Metro, the proposal which has been given the theoretical approval by the Finance Ministry, will make three corridors. Their total length will be 60 km. These three corridors will be like one at Yamuna Pahar, the other in West Delhi and the third in South Delhi. The total construction cost of these three projects will be Rs 34 thousand 580 crores. According to sources in the Ministry of Housing and Urban Affairs, the Finance Ministry gives its approval only after analyzing the funding pattern of the total project cost. It is done only after this approval that the note is prepared for the opinion of all the parties and ministries and it is then approved by the Public Investment Board. By law, the third phase of the Delhi Metro should have been completed in 2016 and the construction of the fourth phase from


Noida Metro | DMRC to begin train trial run in Noida extn line by October

Noida: The stretch of Noida Metro extension from Noida City Centre to Noida Sec -62 trial will start by the October. As per the sources from DMRC (Delhi Metro Rail Corporation), people can use the metro by the end of this year.

The Blue Comprises 44 station from Noida City Centre to Dwarka Sec 21 and 8 stations from Vaishali to Yamuna Bank. The stretch lies at the end of Noida City Centre station.

In 2014, The extension of the line from Noida City Centre to Noida sec -62 was granted by Delhi government and there would be 6 new station which covers 6 km.

The work of the extension lies almost at the end. 70%of the finishing of the track is done and it is at the end and 80% of the work of Civil has been done. The work of making s


Jaipur Metro | Stakeholders okay extension of Phase II project

Jaipur: The stakeholders of Jaipur metro approved the updated project report for Phase II of Jaipur metro on Friday. Phase II has been proposed on the length of 29.5 km between Sitapura and Vishwakarma Industrial Area and has a further agreement of extension of the route by 8 km as the plan is for the extension of Sitapura, which needs to be connected with Ring Road by the year 2031.

Ashwani Saxena, director project Jaipur Metro Rail Corporation (JMRC) said “In the initial detailed project report submitted by Delhi Metro Rail Corporation, the second phase was proposed on the length of 23.8 kilometers between Sitapura and Ambabari. This has been extended to connect Airport and Collectorate circle.”

Ashwani Saxena, direct