Ordinary stepped power transmission systems that used in industry, exhibit abundant energy dissipation, complicated handling and costly maintenance. On the other hand, continuously-variable power transmissions (CVTs), which are recently considered to be used in the industry, despite their high capabilities, face a number of drawbacks including such as : limited torque transmission capacity, high-precision manufacturing and installation requirements, low cost effectiveness and relatively modest power transmission efficiencies. Therefore, innovative power transmission systems that intend to resolve or lessen one or more of these disadvantages are critical in power transmission from pinion to wheel in electric traction motors (motors) of both diesel and electric locomotives; especially when active and advanced control of traction effort and adhesion is of high importance and are going to be welcomed by rail industries. The controlling subsystem of QCPTS includes a micro control system consisting of rotational velocity sensor, power supplier source, and intelligent pins. In each rotational velocity range the velocity sensor sends a signal to the micro controller for processing which causes one intelligent pins become activated and the previously activated pin become deactivated simultaneously. As a result, depending on the rotational velocity change of the rotating output shaft the QCPTS engages a pair of gears. The intelligent magnetic pins have two Start and End work stations. The Start station activates the gear by receiving a starting signal from micro controller and also the End station deactivates the gear by receiving the End signal from micro.

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