Precise. Smooth. Quiet. Intelligent. The Heart of Smart Cooling. Proprietary Field-Oriented Control embedded in iU6xxx ICs — delivering unmatched motor performance across all load conditions.
Traditional 120° square-wave drive wastes energy through torque ripple, commutation noise, and suboptimal current phasing. iNERGY-Drive™ FOC delivers sinusoidal current at the optimal phase angle — maximizing torque-per-ampere across all speeds.
Validated on 12V 4-pole motor, 37,000 RPM operating point. All results from inergy internal testing using real fan motors with Tektronix oscilloscopes. These FOC results carry across the iNERGY-Drive™ platform — for new 12V high-current designs the iU6395 (N/N pre-driver, dual integrated current-sense amplifiers) is the recommended successor.
| # | Test Category | Result | Detail |
|---|---|---|---|
| 1 | FOC vs 120° Square Wave (Sine Magnetization) | Better @ 7K–20K RPM | FOC efficiency exceeds 120° square wave in 7,000–20,000 RPM range |
| 2 | FOC vs 120° Square Wave (Square Magnetization) | Better @ 8K–22K RPM | FOC efficiency exceeds 120° square wave in 8,000–22,000 RPM range |
| 3 | Efficiency Under Different Fan Loads | Auto-Optimize | FOC automatically optimizes efficiency across light, medium, and heavy fan loads |
| 4 | Lead Angle Adjustment | Full Range | Positive, negative, and zero-crossing lead angle all validated and controllable |
| 5 | Coil Parameter Variation ±15% | IDC +1.7–5.8% only | R±15%, L±15% — FOC auto-corrects to reach same target speed, minimal efficiency loss |
| 6 | Motor Startup — Zero Speed | Pass | Smooth startup from standstill in all static conditions |
| 7 | Motor Startup — Tailwind (Forward) | Pass | Direct speed catch-up from 2,150 RPM forward free-run |
| 8 | Motor Startup — Reverse Wind | Pass | Brake to stop then smooth forward start from 2,080 RPM reverse spin |
| 9 | High Speed Control — FOC Max | 120,000 RPM | 4KHz electrical frequency → 4-pole motor → 120,000 RPM theoretical capability |
| 10 | Terminal Programming | Pass | 4-wire burn-in via VDC/PWM/FG/GND without disassembling motor/fan |
Tested on 12038 fan, 12V, same speed setpoint. iU6291 consistently draws less current than the leading competitor at every PWM duty level.
| PWM% | Competitor RPM | Competitor IDC (mA) | iU6291 RPM | iU6291 IDC (mA) | IDC Reduction | Efficiency Gain |
|---|---|---|---|---|---|---|
| 20% | 1938 | 173 | 1933 | 153 | -20 mA | +11.6% |
| 40% | 3237 | 426 | 3251 | 389 | -37 mA | +8.7% |
| 60% | 4503 | 941 | 4516 | 851 | -90 mA | +9.6% |
| 80% | 5858 | 1852 | 5852 | 1742 | -110 mA | +5.9% |
| 100% | 7061 | 3134 | 7002 | 3032 | -102 mA | +3.3% |
AI datacenter fans and pumps must start reliably regardless of airflow or coolant flow conditions at power-on. iNERGY-Drive™ FOC handles all three critical scenarios.
inergy's platform combines the best of ASIC simplicity and MCU flexibility — delivered as a complete solution with IC + motor control firmware + S Programmer tool.
EVB, S Programmer, parameter generation Excel tool, and reference firmware included. FAE remote fine-tune session included for rapid motor optimization.