Motorized Pulleys (Bulk)
Large-diameter drum motors for bulk: a compact sealed drive inside a 320–1000 mm drum. Load classes L/M/H/HD are chosen by diameter and belt tension.
- Quarries, crushing & screening plants
- Grain storage, cement, steel, fertilizer
- Mobile crushing & screening
- Magnetic separators
- Overland and discharge conveyors
| Selection logic | Radial load = belt tension T1+T2 must be < max. allowable radial load for the series; increases with thick/heavy/wide belts |
| Load classes | L (light) / M (medium) / H (heavy) / HD per diameter |
| Options | ATEX 95 Zone 22 dust-explosion-proof; white FDA rubber lagging; special/hot-vulcanized lagging; dual voltage delta/star; 50/60 Hz; Class H motors; synthetic oil; regreasable labyrinth seals; stainless-steel shafts |
Ranges are typical data from leading bulk-segment manufacturers, shown as an industry reference — not a TM-Service model range.
| Series | Diameter, mm | Rated power, kW | Max radial load (T1+T2), N | Shell / face length (RL/FW), mm | Load class |
|---|---|---|---|---|---|
| 320 (L / M / H) | 320 | 0.75–11 | 11500 | ≥ 400 | L / M / H |
| 400 (M / H) | 400 | 2.2–15 | — | ≥ 550 | M / H |
| 500 (L / M / H) | 500 | 2.2–30 | — | ≥ 600 | L / M / H |
| 630 (M / H) | 630 | 5.5–55 | — | ≥ 750 | M / H |
| 800 (M / H / HD) | 800 | 22–132 | — | ≥ 950 | M / H / HD |
| 1000 (H / HD) | 1000 | 160–250 | — | — | H / HD |
Published manufacturer data — not a TM-Service model range.
- 01Determine belt tension T1+T2 (radial load).
- 02Ensure T1+T2 is below the series' max allowable radial load.
- 03Refine diameter, power, torque and speed for the duty.
- 04Match mounting dimensions to the existing conveyor.
- 05Confirm operating conditions: IP, temperature, abrasion, Ex-protection.
- Reinforced shell and large solid shaft
- Planetary/helical gearbox for high torque
- Heavy bearings and labyrinth seals
- Load class L/M/H/HD by diameter
- ATEX execution for dusty environments (Zone 22)
- Classes L / M / H / HD
- ATEX Zone 22 (dust explosion proof)
- Rubber/ceramic lagging, FDA executions
- Dual voltage, 50/60 Hz, Class H
- Synthetic oil, stainless shafts
Technology comparison from published manufacturer data.
| Geared drum motor | Gearless PM direct drive | |
|---|---|---|
| Power range | ≈ 0.025–250 kW | 11–1600 kW |
| Drive architecture | Motor + gearbox inside drum | Outer-rotor PM, direct drive |
| Gearbox | Planetary / helical | None |
| Oil | Oil-lubricated (or oil-free variant) | No oil, no belts |
| Maintenance | Periodic maintenance | Virtually maintenance-free |
| Control | DOL / VFD | VFD 5–50 Hz |
| Diameter | ≈ 80–1000 mm | 500–2000 mm |
| Applications | Unit & bulk goods, food, logistics | Heavy mining, ports, long overland conveyors |
Original → required parameters → mounting dimensions → conditions → technically suitable replacement. We don't claim full identity — an engineer confirms the suitable execution.
How to choose load class L/M/H?
By the required belt tension (T1+T2) for the chosen diameter. If tension exceeds the max allowable, move to a larger diameter or a higher class.
Suitable for abrasive and impact loads?
Yes, heavy series (H/HD) are designed for tough, irregular and extreme conditions — quarries, crushing, transfer.