Stepless Variable Speed Drive
Sango Planetary Cone Mechanical Stepless Variable Speed Drives provide infinitely smooth speed adjustment across a 1:5 ratio span. Featuring heavy-duty cast aluminum/iron housings, bidirectional rotation, zero shock, and constant torque output.
Sango Automation Limited is a recognized Chinese manufacturer of mechanical stepless speed variators and gear reducers. Engineered for demanding industrial environments requiring continuous speed fine-tuning without electrical interference.
Features & Advantages
Smooth speed modulation, robust mechanical torque retention, and long-lasting traction drive mechanics.
Infinitely Variable Speed Regulation (1:5 Range)
Allows smooth, continuous adjustment of output speed from 200 to 1,000 RPM (with 4-pole motor) with precise handwheel or motorized actuator control.
High Low-Speed Torque & Constant Power
Unlike electronic frequency converters, planetary friction variators maintain robust low-speed torque without motor overheating or harmonic distortion.
Bidirectional Rotation & Zero Shock Meshing
Supports both clockwise and counterclockwise operation with smooth, vibration-free speed transitions during continuous production runs.
Modular Combination with Gear Reducers
Easily couples directly with helical gearboxes (R/F/K/S series) or NMRV worm reducers to achieve wide custom reduction ratios down to 0.1 RPM.
Technical Specifications
Core engineering specifications for UDL / MB series mechanical stepless speed variators.
| Model / Parameter | Light Duty (UDL002–UDL005) | Heavy Duty (UDL010–UDL075) |
|---|---|---|
| Motor Power Range | 0.18 kW – 0.55 kW (0.25–0.75 HP) | 0.75 kW – 7.5 kW (1.0–10 HP) |
| Input Speed Range | 1,400 RPM (4-pole motor standard) | 900 – 1,400 RPM |
| Output Speed Range | 200 – 1,000 RPM (Continuous) | 200 – 1,000 RPM (Continuous) |
| Max Output Torque | 1.5 – 6.0 N·m (Direct Variator) | 12.0 – 118.0 N·m (Direct Variator) |
| Speed Variation Ratio | 1:5 Infinitely Stepless | 1:5 Infinitely Stepless |
| Housing Material | Die-Cast Aluminum Alloy (UDL) | High-Strength Cast Iron (HT200) |
| Efficiency at Max Speed | ≥ 90% | ≥ 92% |
Mechanical Stepless Variator vs. Electronic VFD Inverter
Why mechanical variators remain the preferred solution in continuous heavy-duty industrial processing lines.
| Performance Aspect | Sango Mechanical Variator | Electronic VFD Inverter Drive |
|---|---|---|
| Low Speed Torque | Full torque maintained even at lowest RPM | Torque drops significantly at low frequencies (<15 Hz) |
| Electromagnetic Interference | Zero EMI / RFI noise; 100% clean mechanics | Generates electrical noise; requires shielded cables & chokes |
| Motor Heating at Low RPM | Runs standard motor without auxiliary cooling | Requires external forced-cooling fan at low speeds |
| Maintenance Simplicity | Simple oil bath lubrication; no software bugs | Complex electronics subject to capacitor aging & surges |
| Explosion-Proof Safety | ATEX compliant mechanical design available | Requires costly explosion-proof VFD enclosure |
Application Scenarios
Widely utilized in food processing conveyors, ceramic machinery, chemical mixers, printing and dyeing lines, continuous packaging machines, and automated assembly conveyors.
