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Alternator A.R.K5ES

A.R.K5ES Alternator – Brushless, PMG Excited, and High-Efficiency Industrial Alternator

The A.R.K5ES alternator, developed by Arken Power Solutions, is a high-efficiency three-phase, brushless synchronous alternator equipped with a PMG excitation system and MX341 AVR for superior voltage regulation and transient response. Engineered for industrial, rental, and standby generator applications, it ensures voltage stability within ±1% and total harmonic distortion below 5%. Featuring Class H insulation, IP23 protection, and a rigid steel frame, the A.R.K5ES provides durability, low maintenance, and an impressive 95.3% efficiency. Fully compliant with IEC60034, BS5000, NEMA MG1-22, CSA C22.2-100, and ISO9001, this alternator is ideal for prime, standby, and mobile power systems operating in demanding conditions.

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Alternator Model

A.R.K5ES

50Hz (kVA)

565

60Hz (kVA)

656
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 (configurable in star, delta, or parallel star)

  • 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 95.3%

  • 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): 2.83–3.53

    • X’d (Transient): 0.12–0.17

    • X’’d (Subtransient): 0.09–0.12

    • Xq (Quadrature): 2.21–2.82

    • X’’q (Quadrature Subtransient): 0.24–0.34

    • X₂ (Negative Sequence): 0.16–0.23

    • X₀ (Zero Sequence): 0.06–0.10

  • 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

Construction & Design

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

  • Protection: IP23 (optional IP44 with power reduction)

  • Cooling System: Self-ventilated air cooling (1.035 m³/s @50Hz, 1.312 m³/s @60Hz)

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

  • Winding: Double-layer stator winding, 2/3 pitch design eliminates triple harmonics

  • Rotor: Damped rotor with high mechanical balance (BS6861 compliant)

  • Bearings:

    • Drive End: 6220-2RS (sealed-for-life ball bearing)

    • Non-Drive End: 6314-2RS (sealed-for-life ball bearing)

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

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

  • Inertia (WR²):

    • Single Bearing: 8.98 kg·m²

    • Double Bearing: 8.70 kg·m²

  • Weight:

    • Rotor: 617 kg (single bearing) / 588 kg (double bearing)

    • Stator: 722 kg

    • Complete Alternator: 1543 kg (single bearing) / 1535 kg (double bearing)

  • Shipping Weight: 1635 kg (50Hz) / 1625 kg (60Hz)

  • Packing Dimensions: 166 × 87 × 124 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)

  • Low-Speed Voltage Drop Protection: Standard feature

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

  • Protection Features:

    • Stator winding and bearing overheat protection

    • Anti-condensation heater (optional)

  • 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: 1.035 m³/s (50Hz), 1.312 m³/s (60Hz)

  • Noise & Vibration: Balanced per BS6861 standards

Performance Summary

  • Efficiency Range: 94.7–95.3% across load range

  • 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, mobile power, refrigeration, lighting tower, and railway generator systems

Datasheet

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