Energy feedback technology（Optional）

Elevator movement usually gains energy from power source (operation in electric mode); however, when it goes down under heavy load or goes up under light load (operation in power generation mode), the working state of traction machine is equivalent to power generator. In general, the energy generated by traction machine is dissipated in the form of heat energy. The energy feedback technology based on PWM control feeds the regenerative energy to the grid when the traction machine is in the power generation state, saving about 30% of energy compared with the elevator without energy feedback device, causing sinusoidal input current on the power supply side, and greatly reducing harmonic pollution to the power supply. Moreover, the DC side voltage is controlled, which contributes to improve the smoothness of elevator operation.

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  Electric mode operation

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  Power generation mode operation

• PM gearless traction technology

  M gearless PM synchronous traction machine is made of permanent magnet materials, without additional excitation current, no copper loss, saving energy by about 30% compared with traditional worm gear traction machine,

  

• Car Fan/Light shut off-automatic (CFO-A/CLO-A)

  After the elevator has stood by without direction for a certain period of time, the car ventilation device/lighting is turned off automatically to save energy.