PMSM Gearless Drive Dynamics • ERIS-NEXA Elevators
PMSM Synchronous Motors
High-flux neodymium rare-earth magnets deliver superior torque without traditional worm gearboxes. Eliminates oil changes, eliminates thermal dissipation loss, and saves up to 40% on annual electricity consumption.
32-Bit VVVF Dual-Core Control
High-speed digital signal processor executes micro-second vector calculations. Calculates jerk-free S-curve velocity trajectories for unnoticeable start, travel, and millimetric landing floor leveling.
<48 dB Acoustic Level
Precision balanced sheaves and acoustic vibration isolators maintain shaft noise levels quieter than a luxury private library. Ideal for residential penthouses, master bedrooms, and executive boardrooms.
Regenerative Grid Return
During heavily-loaded descent or lightly-loaded ascent, the motor functions as a clean generator, converting gravitational potential energy into filtered AC power and returning it to the building electrical grid.
Elevator Drive Technology Matrix
| Evaluation Parameter | Gearless PMSM MRL (Recommended) | Traditional Geared Traction | Hydraulic Eco-Drive | Vacuum Pneumatic |
|---|---|---|---|---|
| Machine Room Required? | ❌ Zero (Motor inside shaft) | ⚠️ Overhead room needed | ⚠️ Adjacent control box | ❌ Zero (Self-contained) |
| Energy Efficiency | 🟢 Saves up to 40% Electricity | 🟡 Standard consumption | 🟡 High pump draw on ascent | 🟢 Energy efficient descent |
| Operating Speed Range | ⚡ 1.0 to 2.5 m/s (High Speed) | 0.6 to 1.0 m/s | 0.3 to 0.6 m/s | 0.15 to 0.25 m/s |
| Acoustic Noise Level | 🟢 Ultra-Quiet (<48 dB) | 🟡 Moderate gear hum | 🟡 Pump noise | 🔴 Vacuum suction sound |
| Pit Depth Requirement | 1350 - 1800 mm | 1600 - 2000 mm | 🟢 Low Pit (300 - 450 mm) | 🟢 Zero Pit Required |
| Maximum Travel Height | Up to 35+ Floors (100m+) | Up to 15 Floors | Up to 5 Floors (15m) | Up to 4 Floors (12m) |
| Best Architectural Fit | 🏆 Modern Towers, Villas & Offices | Older retrofits & low rise | Low-headroom private villas | Small existing duplex retrofits |