Scientific and Technical Journal


ISSN Print 2221-3937
ISSN Online 2221-3805

One of key issues in the design / operating the electric drive is its energy efficiency. Great value to efficiency provided by coefficient of efficiency for each unit/ component, which is a part of electric drive. However, electric drive is part of the process, wherein certain conditions / circumstances can changes direction of energy flow. For vertical transport systems, such modes are common, if electric drivepass to generator mode, while lifting or loweringcargo. Very often, energy received during generator mode of the drive dissipated into heat in the discharge resistor connected to the converter, which is part of drive. In case drive connected to a grid, for raising energy efficiency, we should put intermediate link –inverter, driven by electrical grid, and give the excess energy into the grid.

In this paper proposes a solution for electric drives, with independent supply and do not have the elements / units capable to receive excess energy. If drive elements for receiving excess energy (excluding discharge resistors) are not available, it is suggested to add into the structure of the electric drive a DC/DC converter that will take excess energy, charging storage elements (supercapacitors) and give energy back if necessary. DC/DC converters structure is proposed, controlling algorithms are described for providing autonomous work of electric converter (converter operation is related only to the voltage level of the DC bus). Benefits received by electric drive, which have the DC/DC converter with supercapacitors, described.

Also,has been made  a research  of lift transporting systems, which has fundamentally different types of electric drive (with an induction drive with contactor control and gear, with gear and frequency converter, with gear (with vertical winch) and the frequency converter, direct drive (gearless) with frequency converter), and shown energy levels, resulting from motor working in  generator mode.

The research found that in electric lifts with contactor controlling, recuperation takes place only in high-rise buildings under boundary levels of cab loading. In gear electric drives with frequency converters a slight recovery (up to 30 W • h) is observed in the boundary loading modes of the cab and close to them. In gearless electric drives with frequency converters, observed highest level of recuperation. In general, the amount of energy dissipated in braking resistors depends on the number of floors in the building, speed, carrying capacityof the lift, efficiency of the motor and mechanical parts. Complex of these factorscauses necessity to use DC/DC converter with supercapacitors in each case.


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