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Alternator A.R.K4F

A.R.K4F Alternator – Brushless, High-Efficiency, and PMG-Excited Industrial Alternator

The A.R.K4F alternator, engineered by Arken Power Solutions, is a three-phase, brushless synchronous alternator with a PMG excitation system, ensuring exceptional voltage stability and transient performance. With ±1% voltage regulation and less than 5% total harmonic distortion (THD), it provides clean, reliable power output for both prime and standby applications. Built with Class H insulation, IP23 protection, and a durable steel frame, it offers high efficiency up to 94.1% and long operational life. Certified under IEC60034, BS5000, NEMA MG1-22, CSA C22.2-100, and ISO9001, the A.R.K4F alternator is ideal for industrial, rental, mobile, and telecom generator systems.

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Alternator Model

A.R.K4F

50Hz (kVA)

380

60Hz (kVA)

456
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; star, delta, or parallel configurations)

  • Voltage Regulation: ±1.0%

  • Total Harmonic Distortion (THD): <5.0% (balanced load), <1.5% (no load)

  • Efficiency: Up to 94.1% at full load

  • Sustained Short Circuit Current: >300% rated current for 10 seconds

  • 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

  • Reactances (per-unit at rated kVA):

    • Xd (Synchronous): 2.17–3.21

    • X’d (Transient): 0.14–0.18

    • X’’d (Subtransient): 0.09–0.13

    • Xq (Quadrature): 1.66–2.84

    • X’’q (Quadrature Subtransient): 0.25–0.42

    • X₂ (Negative Sequence): 0.16–0.28

    • X₀ (Zero Sequence): 0.06–0.10

  • Time Constants:

    • Transient (T’d): 0.08 s

    • Subtransient (T’’d): 0.019 s

    • Armature (Ta): 0.018 s

    • Open Circuit Field (T’do): 1.7 s

  • Short-Circuit Capability: 300% of rated current for 10 seconds

Construction & Design

  • Insulation Class: H (125°C rise at 40°C ambient)

  • Protection: IP23

  • Cooling System: Self-ventilated air flow (0.486 m³/s @50Hz, 0.580 m³/s @60Hz)

  • Frame Material: Rigid steel frame with cast aluminum front and rear covers

  • Winding: Double-layer stator winding, 2/3 pitch design to reduce harmonic distortion

  • Rotor: Damped rotor with dynamic balancing per BS6861

  • Bearings:

    • Drive End: 6317 (sealed-for-life ball bearing)

    • Non-Drive End: 6314 (sealed-for-life ball bearing)

  • Overspeed Capability: 120% of rated speed (2250 rpm)

  • Leads: 12 leads, reconnectable for multiple configurations

  • Moment of Inertia (WR²):

    • Single Bearing: 5.43 kg·m²

    • Double Bearing: 5.23 kg·m²

  • Weight:

    • Complete Alternator: 1160 kg

    • Rotor: 440–463 kg

    • Stator: 535 kg

  • Shipping Weight: 1775–1780 kg

  • Packing Dimensions: 155×87×107 cm (50Hz), 156×87×107 cm (60Hz)

Regulation & Control

  • Excitation System: PMG excitation with AVR

  • AVR Model: MX341 (standard), optional SX460, SX440, AS440, MX321

  • Voltage Regulation Accuracy: ±1.0%

  • Parallel Operation: Supported (AVR dependent)

  • RFI Suppression: Complies with BS EN 61000-6-2 and BS EN 61000-6-4, VDE 0875G/N

  • Low-Speed Voltage Drop Protection: Standard

  • 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 to BS6861 standards

  • Cooling Air Requirement: 0.486 m³/s @50Hz, 0.580 m³/s @60Hz

Performance Summary

  • Voltage Dip (Transient Load): ≤25% at 0.8 power factor

  • Recovery Time: <0.5 seconds

  • Locked Rotor Motor Starting: >300% of rated current

  • Efficiency Range: 93.4–94.1% across load range

  • Applications: Prime power, standby, telecom, mobile lighting towers, railway, refrigeration, and rental generator systems

Datasheet

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