The BLT-QS passenger elevator adopts gearless permanent magnet synchronous traction machine with neat and compact decoration. The machine room area is largely reduced compared with conventional machine room. It is the new type energy-saving and environmental friendly product designed mainly for high-rank apartment, office building and other places. Traction and energy conservation system is upgraded again—energy feedback system: It is energy conservation and environmental friendly; extending the service life of components; saving input on machine room heat-dissipation devices. Through high-performance EMI filter, the interference caused by renewable energy on other devices in the electric net is avoided.