L’**A.R.K5F** est un alternateur triphasé sans balais conçu pour une puissance fiable et continue. Son **système PMG** et son **AVR MX341** assurent une régulation précise et un rendement jusqu’à **95,4 %**, le rendant idéal pour les groupes électrogènes **industriels et de secours**.
| Système d’excitation | SELF EXCITED |
| A.V.R. | MX341 WITH PMG |
| Régulation de tension à régime établi | ± 1.0 % |
| Court-circuit prolongé | >300% OF RATED CURRENT |
| Facteur de puissance nominal | 0.8 |
Electrical Performance
Type: Three-phase, brushless, self-excited synchronous alternator with PMG excitation
Frequency: 50 / 60 Hz
Power Factor: 0.8
Voltage Range: 380/220V – 480/277V (reconnectable in star, delta, or parallel star configurations)
Voltage Regulation: ±1.0%
Total Harmonic Distortion (THD): <5% (balanced linear load), <1.5% (no load)
Sustained Short Circuit Current: >300% rated current for 10 seconds
Efficiency: Up to 95.4%
Overload Capacity: 110% for one hour in a six-hour cycle
Telephone Harmonic Factor (THF): <2%
Telephone Interference Factor (TIF): <50
Short Circuit Ratio (1/Xd): 0.09 typical
Reactances (Per Unit at Rated kVA):
Xd (Synchronous): 2.43–3.33
X’d (Transient): 0.11–0.16
X’’d (Subtransient): 0.08–0.11
Xq (Quadrature): 2.03–2.66
X’’q (Quadrature Subtransient): 0.21–0.31
X₂ (Negative Sequence): 0.15–0.21
X₀ (Zero Sequence): 0.07–0.09
Time Constants:
Transient (T’d): 0.08 s
Subtransient (T’’d): 0.012 s
Armature (Ta): 0.019 s
Open Circuit Field (T’do): 2.5 s
Waveform Distortion: <1.5% (no load), <5% (linear load)
Construction & Design
Insulation Class: H (125°C rise at 40°C ambient)
Protection: IP23 (optional IP44 with reduced output)
Cooling: Self-ventilated air cooling (1.035 m³/s @50Hz, 1.312 m³/s @60Hz)
Frame: Rigid steel frame with cast aluminum front and rear covers
Stator: Double-layer winding, 2/3 pitch design eliminates triple harmonics
Rotor: Damped rotor dynamically balanced to BS6861 standards
Bearings:
Drive End: 6220 (sealed-for-life ball bearing)
Non-Drive End: 6220 (sealed-for-life ball bearing)
Overspeed Capability: 120% of rated speed (2250 rpm)
Leads: 12 reconnectable leads for flexible voltage configurations
RFI Suppression: BS EN 61000-6-2 & BS EN 61000-6-4, VDE 0875G/N compliant
Mechanical Balance: Half-key dynamic balance in double bearing configuration
Cooling Air Requirement: 1.035 m³/s (50Hz), 1.312 m³/s (60Hz)
Winding Resistances:
Stator: 0.0037 Ω/phase (22°C, star connection)
Rotor: 2.16 Ω (22°C)
Dimensions & Weight
Rotor Weight: 684 kg (single bearing) / 655 kg (double bearing)
Stator Weight: 805 kg
Complete Alternator Weight: 1685 kg (single bearing) / 1694 kg (double bearing)
Inertia (WR²): 10.033 kg·m² (single bearing) / 7.7289 kg·m² (double bearing)
Shipping Weight: 1775–1780 kg
Packing Dimensions: 166 × 87 × 124 cm
Regulation & Control
Excitation System: PMG excitation with brushless AVR
AVR Model: MX341 (standard), optional SX460, SX440, AS440, MX321
Voltage Regulation Accuracy: ±1.0%
Parallel Operation: Supported (AVR-dependent)
Protection Features:
Stator winding and bearing overheat protection
Anti-condensation heater (optional)
RFI Suppression: Integrated (low interference with radio transmissions)
Standards Compliance: IEC60034, GB755, BS5000, NEMA MG1-22, CSA C22.2-100, AS1359
Certification: ISO9001 Quality Management System
Environmental Parameters
Operating Temperature: –15°C to +40°C
Relative Humidity: Up to 95% (non-condensing)
Altitude: Up to 1000 m without derating
Noise & Vibration: Balanced per BS6861 standards
Performance Summary
Efficiency Range: 94.6–95.4%
Voltage Dip (Transient Load): ≤25% at 0.8 PF
Recovery Time: <0.5 seconds
Locked Rotor Motor Starting: >300% of rated current
Applications: Prime power, standby, rental, telecom, lighting towers, refrigeration, and railway generator systems
