There are traditional elevator machine room, the host, control panel, etc. placed in the engine room. As technology advances, traction machine and electrical components miniaturization, people are not interested in getting on the elevator machine room. MRL elevator machine room is relative terms, that is, eliminating the engine room, the original engine room control panel, traction machine, the governor moved wells, etc., etc., or replaced by other techniques.

     MRL feature is no room for builders to reduce costs, while MRL generally adopts frequency control technology and permanent magnet synchronous motor technology, so energy-saving, environmental protection, does not occupy space outside except hoistway.
     1998 Germany HIRO LIFT launched its innovative design to the counterweight as driven elevators without machine room, after which MRL has developed rapidly. Because it does not take up floor space, environmental protection, energy saving and more and more people are using. In recent years, Japan, Europe, 70-80% of newly installed elevator machine room less elevator, only 20-30% of the elevator as a room or hydraulic lift.
    (1) mounted on: Coming permanent magnet synchronous traction machine placed at the top of the hoistway 2:1, around the law is more complicated;
    (2) under-mounted: permanent magnet synchronous traction machine is about to be placed in the bottom of the shaft, 2:1, around the law is more complicated;
    (3) Jiaoding driven: the tractor into the car roof;
    (4) for heavy-driven: the hoisting machine placed in the counterweight.