UK Firm Develops 3-Speed Transmission for Electric Cars

Multi-speed transmission allows electric motor to operate in its most efficient range, Antonov contends.

Published: 05-Jan-2011

The Antonov website further reveals how it optimized the transmission for efficiency, package space and shift quality. It is scalable which means it can be configured for all electric vehicle applications including commercial vehicles, buses and passenger cars, both in longitudinal and transverse installations.

In particular, Antonov explains why a multi-speed transmission is even necessary, considering electric motors offer a wide torque curve compared to IC engines. Fact is, electric-motor efficiency reduces significantly outside the 'sweet spot' of the speed range, especially at low speed. For this and other reasons, a multi-speed transmission offers significant benefits to all types of electric vehicles.

The overall benefits of a multi-speed transmission are plentiful. First, the motor operates in its most efficient speed range. It avails the option to extend vehicle range or use a smaller battery pack; even a smaller electric motor can be specified. This alone allows greater flexibility of motor supplier selection.

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