Abstract
A Contact-Less Power Transfer System
for the Elevator's Car Power Supply
Eung-Kyu Lim
Dept. of Electronics & Electrical Eng. Graduate School, Chung-Ang University
Supervised by Professor
Yoon-Ho Kim, Ph.D
Most elevators have hoisting ropes attached to the elevator car, which moves up and down in the hoist way on its guiderails. Each car requires power and signal lines. But, these lines tend to hang from elevator car like tail-code, which may result in crack and disconnection of power. In this research, by eliminating the tail code, the new approach for contact-less power transfer system is taken for safety.
The contact-less power transfer system consist of contact-less transformer and inverter. The contact-less transformer is capable of providing power without actual mechanical contact as its structure is unique due to two winding wires separated by air gap. The high frequency inverter uses power resonance type to minimize its loss.
Also, to maximize the effectiveness of contact-less inverter, core is installed below the first winding wire to minimize resistance increase of the second wire. The resonance inverter, which is capable of tracking changes in resonance inductance, was used to minimize any possible loss in power. This helped to control inverter to switch at zero current always.
Then, the designed system is verified through simulation using
Maxwell and ICAP4. Based on simulation analysis result, 1[KW] high
frequency inverter and transformer are designed and used in the
experiment.
LINK
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