Importance

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Abstract

A transmission system with continuously variable transmission ratio includes an input shaft (2), an output shaft (4) and preferably also a differential gearset comprising at least three parallel shafts (2, 4, 12). The system also includes first and second motor/generators comprising first and second rotors (16, 32) and first and second stators (20, 26; 36, 26), respectively. The first and second rotors (16, 32) are connected to respective shafts. The electrical connections of the first and second stators are connected together. A controller (45) is arranged to control the flow of electrical power between the first and second stators. At least a portion (26) of the first stator is connected to at least a portion (26) of the second stator. The said portion (26) is movable in a first direction, thereby increasing the air gap of the first motor/generator and decreasing the air gap of the second motor/generator, and in a second direction, thereby decreasing the air gap of the first motor/generator and increasing the air gap of the second motor/generator. An actuator (42), which is controlled by the controller (45), is connected to the said portion (26) of the stator to move it selectively in the first or second direction.

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First Claim