unadded
Example – Selecting a 400W Gear Motor:
Motor power: 0.4 kW
Motor speed: 1400 RPM
Motor torque = 9550 × 0.4 ÷ 1400 ≈ 2.7 N.m
With 30:1 ratio and 92% efficiency:
Output torque ≈ 2.7 × 30 × 0.92 ≈ 74.5 N.m
Then compare this value against the manufacturer’s output torque table for the specific model
Torque Margin Recommendations:
| Duty Type | Recommended Safety Margin |
| Smooth, steady operation (conveyors, fans, mixers) | No extra margin needed – rated torque ≥ required torque |
| Frequent start/stop (index tables, lifts, palletizers) | 1.2 – 1.5× safety margin |
| Shock loads (crushers, punch presses) | 1.5× or higher safety margi |
| Power | Shaft Dia | CH (Horizontal) | CV (Vertical) | GH (Horizontal HD) | GV (Vertical HD) |
| 100W | 18mm | CH18 | |||
| 200W | 22mm | CH22 | |||
| 400W | 28mm | CH28 | |||
| 750W | 28mm | CH28 | |||
| 1500W | 32mm | CH32 | |||
| 2200W | 40mm | CH40 | |||
| 3700W | 50mm | CH50 |