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ICED 11
Papers

Development of Transmission Specifications for an Electric Vehicle

Development of Transmission Specifications for an Electric Vehicle

Year: 2011

Section: Enabling Technologies & Tools

Editor: Chakrabarti, A.

Author: Mahala, K.Manoj ; Deb,Anindya

Section: Enabling Technologies & Tools

Pages: 292-299

Abstract

At present, a great deal of efforts are on to develop personal modes of transportation such as an electric vehicle (EV) with potentially a higher degree of sustainability as compared to a conventional IC (internal combustion) engine powered vehicle. A transmission system with torque amplification capabilities is essential for an IC engine-based vehicle as, at low rpm, such engines develop extremely low torques which are not sufficient to move a vehicle from rest. However this is not the case for a DC (direct current) motor powered electric vehicle in which the motor intrinsically generates a high torque at rest conditions and delivers maximum power over a wide range of speed which can be well within the operational requirement of a vehicle. Thus,by varying the armature speed of a DC motor with an electronic controller and maintaining a uniform gear ratio, its drivability can be achieved. As most small EVs using DC traction motors are equipped with a single gear transmission system, it may appear that multi-speed gears are redundant for such vehicles. The current study dispels this myth by showing that a two-speed gear box can actually improve the functionality of a DC traction motor-based EV by increasing the rated top speed, initial acceleration and gradeability. In the process,a systematic methodology is developed for estimating traction requirements when a vehicle is propelled into motion from rest and remains in accelerated or steady state conditions subsequently. Together with this, a step-by-step approach has been devised for arriving at the specifications for a two-speed gear box taking into account speed-dependent motor torque and power characteristics.

Keywords: Electric Vehicle, Drivetrain.

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ds endorsed conferenceICoRD 11 - The 3rd International Conference on Research into Design

Design is ubiquitous; it pervades almost all spheres of life, and has been around as long as life has taken up the task of purposefully changing the world around it. Research in design and the emergence of a research community in this area has been relatively new, its development influenced by the multiple facets of design (human, artefact, process, organisation, and the micro- and macro economy by which design is shaped) and the associated diversification of the community into those focusing on...

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Keywords
Design 2010