Design of Elevator Comprehensive Back-to-Back Test System Based on Common DC Bus

As a new horizontal rotation loading device, elevator comprehensive back-to-back test system can simulate the energy status of in different elevator load. It makes the elevator or its components such as magnetorheological(MR) traction transmission device to meet the dynamic characteristics in practical test conditions. By analyzing the characteristics of elevator traction machine and the close relationship between frequency converter and traction machine, this paper derived a mathematical system model of elevator traction machine. An energy-feedback type traction machine back-to-back experimental system was proposed through establishing a common DC bus. And the functions, components, control and additional equipment of the experimental system was also introduced in this paper. The test system can realize actual testing and verification on various operating characteristic parameters of elevator products and its control mode, which offers a comprehensive and reliable performance test platform for elevator products, and ensures the quality of the finished product. The experimental results of MR traction transmission device in simulated condition showed that the system had easy operation, small structure size, large detection range, etc. Besides, it overcame the disadvantages of conducting MR traction transmission device type test in an entire elevator machine.