Importance

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Abstract

A transmission system of continuously variable transmission ratio includes an input shaft, an output shaft, first and second electric motor/generators comprising first and second rotors and first and second stators, respectively, at least one of the motor/generators being of axial flux type, the first and second rotors being connected to rotate with respective shafts and the electrical connections of the first and second stators being connected together. A controller is arranged to control the flow of electrical power between the first and second stators. The stator of the said at least one motor/generator comprises two stator portions on opposite sides of the associated rotor, at least one of which is arranged to be movable in the axial direction. The said portion of the stator is rotatably secured to a spigot portion of the associated motor/generator extending in the axial direction by way of cooperating helical formations. An actuator is arranged to rotate one of the said portions of the stator and the spigot relative to the other, thereby moving the said portion of the stator in the axial direction with respect to the associated rotor.

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First Claim