Multi-Speed Transmission Improves Electric Cars Vocis has developed a multi-speed transmission that will contribute to the acceptance of electric vehicles, and will display it at EVS, the Electric Vehicle Symposium (to be held 13-16 May in Norway). Simulations show that a two-speed configuration could reduce the battery energy consumed by five to 10 per cent over the industry-standard New European Drive Cycle, without increasing cost or packaging volume; it could also extend battery life and potentially help downsize the power-train and battery pack. Andy Turner, EV transmissions specialist at Vocis, said: 'Electric motors have a very wide operating range, but that doesn't mean that they are equally efficient at every speed. 'The torque curve of a typical traction motor is well suited to vehicle propulsion, having maximum torque from zero speed and a wide constant power region. 'However, there is a 'sweet spot', typically at medium speed and medium to high l...
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