{"id":17471,"date":"2026-11-07T14:16:48","date_gmt":"2026-11-07T13:16:48","guid":{"rendered":"https:\/\/ventsystems.de\/rolltor-motor-nachruesten\/"},"modified":"2026-11-07T15:01:26","modified_gmt":"2026-11-07T14:01:26","slug":"rolltor-motor-nachruesten","status":"publish","type":"post","link":"https:\/\/ventsystems.de\/en\/rolltor-motor-nachruesten\/","title":{"rendered":"Retrofitting a roller door motor: torque, shaft and manual override"},"content":{"rendered":"

In brief:<\/strong> Smaller roller doors on garages, carports or storage units can be motorised with a 45 mm tubular motor. What matters is the weight of the door, the shaft diameter and manual operation for power cuts. Tubular motors are not suitable for heavy industrial doors.<\/p>\n

Rough torque estimate<\/h2>\n

Rule of thumb: door weight in kg \u00d7 shaft radius in m \u00d7 10 gives the load torque in Nm \u2013 plus a 20\u201330 % reserve. Example: 60 kg door, 70 mm shaft (radius 0.035 m, a bit more with the curtain): 60 \u00d7 0.05 \u00d7 10 = 30 Nm, so 40 Nm with reserve.<\/p>\n

Suitable A-OK motors<\/h2>\n\n\n\n\n\n\n
Motor<\/th>\nTorque<\/th>\nSpecial feature<\/th>\nNet price<\/th>\n<\/tr>\n<\/thead>\n
AM45 mechanical<\/a><\/td>\n15\u201350 Nm<\/td>\nStandard, wall switch<\/td>\nfrom 65 \u20ac<\/td>\n<\/tr>\n
AM45E with emergency hand crank<\/a><\/td>\n30\u201350 Nm<\/td>\nManual operation during power cuts, radio 433 MHz optional<\/td>\nfrom \u20ac125<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Both fit shafts from 54 to 80 mm, for example 60 mm octagonal.<\/p>\n

Why manual operation matters<\/h2>\n

Ist das Rolltor der einzige Zugang, sitzt man bei Stromausfall fest. Der AM45E hat ein Schneckengetriebe mit Nothandkurbel (Untersetzung 15:1) \u2013 das Tor l\u00e4sst sich dann von Hand \u00f6ffnen.<\/p>\n

Safety<\/h2>\n