maschinenraumlos

Maschinenraumlos, in elevator technology often referred to as machine-room-less (MRL), denotes a configuration in which the drive machinery and controller of an elevator are installed without a dedicated separate machine room above the hoistway. Instead, the drive motor and related equipment are located in the hoistway itself or in a compact electrical cabinet adjacent to the shaft.

In MRL installations, drive machines (geared or gearless traction motors) and control systems are mounted within the hoistway or in an integrated equipment cabinet near the shaft, while auxiliary equipment such as electrical panels can be placed in a lobby, shaftside niche, or a small service area. This arrangement reduces the space needed for a traditional machine room and can simplify integration in space-constrained buildings.

Advantages include saving building floor area, potentially lower construction costs, and easier installation in tight sites. MRLS can be particularly attractive for mid-rise or urban buildings where space for a separate machine room is limited. Some systems also offer energy recovery features through regenerative drives.

Challenges and considerations involve heat dissipation and noise control, as the hoistway or cabinet must be adequately ventilated and acoustically managed. Maintenance access can be more restricted compared with conventional machine rooms. Compliance with safety standards and local codes is essential; in Europe this typically involves EN 81-20/50, while other regions follow applicable national or international elevator standards. Retrofitting existing buildings may require structural and electrical adaptations.

Usage of Maschinenraumlos elevators grew significantly from the 1990s onward, especially in Europe, where space-efficient lift solutions are common in new constructions and renovations. The term is standard in German-speaking regions and describes a prevalent approach to modern elevator design.