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The acceleration and deceleration periods during each race of a vertical transport installation may be considered as periods of transitional processes where kinematics and dynamic measures variations take place (acceleration, speed and forces) as well as some electric measures (actuating motorпїЅs current). Considering T as the duration of the process, for the minimisation of the installed power, the minimisation of the energy dissipated in the system is imposed during the transitional period: ? ? ? ? ? ? T 2 1 0 ...