Springless Direct Drive Counterbalance
By Huu Khanh Nguyen · Updated October 28, 2026 · sectional-door, counterbalance, springless, direct-drive, novoferm, assa-abloy
A direct-drive motor on the shaft that lifts a sectional door through cable drums without springs, with a catch device on each side.
Parameters
| Name | Default | Unit |
|---|---|---|
| Door width | 2438 | mm |
| Door height | 2133.6 | mm |
| Shaft or track height above the door top | 330 | mm |
| Shaft position | front | |
| Backroom beyond the door height | 457 | mm |
| Leaf weight | 106.6 | |
| Motor side | right | |
| Cable drum diameter | 101.6 | mm |
| Depth | (shaftPosition == 'rear' ? (doorHeight + backroom) : drumDiameter / 2 + 3) + 149.225 - Math.min(0, (shaftPosition == 'rear' ? (doorHeight + backroom) : drumDiameter / 2 + 3) - 80) | mm |
| Height | (doorHeight + shaftOffset) + 115 | mm |