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Alternator ARK6D

A.R.K6D Alternator – PMG Excited, Brushless, and Industrial-Grade High-Efficiency Alternator

The A.R.K6D alternator, developed by Arken Power Solutions, is a robust three-phase, brushless synchronous alternator with PMG excitation and MX341 AVR control, ensuring superior voltage stability and excellent transient response. With ±1% voltage regulation and less than 5% THD, it provides clean, stable power suitable for industrial, telecom, rental, and standby generator applications. Built with Class H insulation, IP23 protection, and a rigid steel frame, the A.R.K6D combines mechanical durability with up to 95.6% efficiency, making it ideal for demanding power systems. Fully compliant with IEC60034, BS5000, NEMA MG1-22, CSA C22.2-100, and ISO9001, it offers reliability, long lifespan, and smooth operation even under harsh environmental conditions.

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Alternator Model

ARK6D

50Hz (kVA)

940

60Hz (kVA)

1063
Control System SELF EXCITED
A.V.R. MX341 WITH PMG
Voltage Regulation ± 1.0 %
Sustained Short Circuit >300% OF RATED CURRENT
Rated Power Factor 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 (configurable in star, delta, or parallel star)

  • Voltage Regulation: ±1.0%

  • Total Harmonic Distortion (THD): <5% (balanced load), <1.5% (no load)

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

  • Efficiency: 94.5–95.6% depending on load and frequency

  • Overload Capacity: 110% for one hour in a six-hour period

  • Telephone Harmonic Factor (THF): <2%

  • Telephone Interference Factor (TIF): <50

  • Short Circuit Ratio (1/Xd): 0.09 typical

  • Power Ratings (Winding 311):

    • 50 Hz: 830–1000 kVA (Efficiency 95.2–95.6%)

    • 60 Hz: 913–1219 kVA (Efficiency 94.5–95.4%)

  • Reactances (Per Unit at Rated kVA):

    • Xd (Synchronous): 2.70–3.37

    • X’d (Transient): 0.19–0.23

    • X’’d (Subtransient): 0.08–0.10

    • Xq (Quadrature): 1.77–3.13

    • X’’q (Quadrature Subtransient): 0.18–0.25

    • X₂ (Negative Sequence): 0.16–0.20

    • X₀ (Zero Sequence): 0.08–0.10

    • Leakage Reactance (XL): 0.02–0.03

  • Time Constants:

    • Transient (T’d): 0.18 s

    • Subtransient (T’’d): 0.025 s

    • Armature (Ta): 0.04 s

    • Open Circuit Field (T’do): 2.44 s

Construction & Design

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

  • Protection: IP23 (optional IP44 with 5–10% power reduction)

  • Cooling: Self-ventilated air cooling

    • 50 Hz: 1.614 m³/s (3420 cfm)

    • 60 Hz: 1.961 m³/s (4156 cfm)

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

  • Stator: Double-layer winding, 2/3 pitch eliminates 3rd, 9th, and 15th harmonics

  • Rotor: Damped rotor dynamically balanced per BS6861 standards

  • Bearings:

    • Drive End: 6224 (ISO, sealed-for-life ball bearing)

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

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

  • Leads: 12 reconnectable leads (star, delta, or parallel star)

  • Inertia (WR²): 19.4965 kg·m² (2-bearing) / 20.0438 kg·m² (1-bearing)

  • Cooling Air Requirement: 1.614–1.961 m³/s

  • Winding Resistance:

    • Stator: 0.003 Ω/phase (22°C, star connection)

    • Rotor: 1.88 Ω (22°C)

Dimensions & Weight

  • Rotor Weight: 866–1010 kg

  • Stator Weight: 1010 kg

  • Complete Alternator Weight: 2117–2180 kg

  • Shipping Weight (Crated): 2145–2173 kg

  • Packing Dimensions: 183 × 92 × 140 cm

Regulation & Control

  • Excitation System: PMG excitation with brushless design

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

  • 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

  • Cooling Air Requirement: 1.614 m³/s (50Hz), 1.961 m³/s (60Hz)

  • Noise & Vibration: Balanced to BS6861 mechanical standards

Performance Summary

  • Efficiency Range: 94.5–95.6%

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

  • Recovery Time: <0.5 seconds

  • Locked Rotor Motor Starting: >300% rated current

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

Datasheet

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