1. EMW is made by coaxial scheme consists of two planetary series and the motor-generator. The interaction occurs in such a way that all elements of the EMW rotate in one direction with the shaft traction engine. With increasing engine speed angular velocity of rotation of the elements vary in the convergent value, which allows you to smoothly change the gear ratio between output shaft and the shaft of the motor from 0 to 1, moving to a direct transfer, when all the elements of the EMW will rotate in one direction with the same angular velocity. Moreover, the yield on the direct transfer - adjustable and is available in a wide range of speeds. 

 2. The design of the EMW can also: 

 - Get up factor transmission of rotation on the output shaft, 

 - Implement the reverse rotation of the output shaft, 

 - Effective engine braking, storing electrical energy 

 - To accumulate the mechanical energy to run the engine after a short stop at a traffic light or to give additional traction in the beginning of the movement.