Alternator A.R.K5F

A.R.K5F Alternator – Brushless, PMG Excited, and High-Efficiency Industrial Alternator

The A.R.K5F alternator, developed by Arken Power Solutions, is a heavy-duty three-phase, brushless synchronous alternator equipped with a PMG excitation system and MX341 AVR for stable, precise voltage control and superior transient response. It maintains ±1% voltage regulation and less than 5% total harmonic distortion (THD), ensuring consistent and clean electrical performance. With Class H insulation, IP23 protection, and a rigid steel frame, the A.R.K5F delivers high efficiency up to 95.4%, making it ideal for industrial, rental, telecom, and standby generator applications. Fully compliant with IEC60034, BS5000, NEMA MG1-22, CSA C22.2-100, and ISO9001, it provides long-term reliability in the most demanding environments.

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Alternator Model

A.R.K5F

50Hz (kVA)

670

60Hz (kVA)

775
Control SystemSELF EXCITED
A.V.R. MX341 WITH PMG
Voltage Regulation ± 1.0 %
Sustained Short Circuit >300% OF RATED CURRENT
Rated Power Factor0.8

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

Datasheet

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