A rigid steel or cast-iron base frame bolted to the machine beam on which the traction machine, motor, and brake assembly are mounted and aligned.
Full Definition
The elevator machine bedplate (base frame, soleplatz) is a precision-machined flat structural frame that provides a stable, vibration-isolated mounting surface for the traction machine assembly. It is bolted to the machine beam(s) through anti-vibration mounts (rubber-metal isolators) to attenuate structure-borne noise transmission to the building fabric. The bedplate incorporates: (1) machined pads to set and maintain the sheave-to-guide alignment; (2) jacking screw points for shimming during installation; (3) integral rope guard supports. Material: S235/S355 welded steel plate, typically 20–40 mm thick, normalised after welding to relieve residual stresses. Flatness tolerance: ≤ 0.5 mm over full length. Anti-vibration mount selection follows ISO 10816-3 for acceptable vibration velocity on the machine room floor. In gearless PMSM machines, the bedplate also provides the bearing reaction path and must be stiff enough to prevent shaft misalignment under torque reversals.
