Alternator A.R.K7E

A.R.K7E Alternator – PMG Excited, Brushless, and Heavy-Duty Industrial Alternator

The A.R.K7E alternator, developed by Arken Power Solutions, is a heavy-duty three-phase brushless synchronous alternator equipped with PMG excitation and an MX321 AVR for superior voltage regulation and fast transient response. With ±1% voltage stability and THD below 5%, it guarantees clean, consistent power output ideal for industrial, rental, and standby generator systems. Featuring Class H insulation, IP23 protection, and sealed-for-life bearings, it offers excellent mechanical strength, reduced maintenance, and long-lasting performance. Delivering up to 96% efficiency, this alternator meets global standards including IEC60034, BS5000, NEMA MG1-22, CSA C22.2-100, and ISO9001, ensuring dependable operation under demanding environments.

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Alternator Model

A.R.K7E

50Hz (kVA)

1320

60Hz (kVA)

1550
Control System SELF 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)

  • 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 96.1%

  • 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): 0.20

  • Reactances (Per Unit at Rated kVA):

    • Xd (Synchronous): 2.28–3.28

    • X’d (Transient): 0.18–0.21

    • X’’d (Subtransient): 0.17–0.19

    • Xq (Quadrature): 2.05–3.17

    • X’’q (Quadrature Subtransient): 0.22–0.27

    • X₂ (Negative Sequence): 0.14–0.16

    • X₀ (Zero Sequence): 0.04–0.05

    • Leakage Reactance (XL): 0.03–0.04

  • Time Constants:

    • Transient (T’d): 0.29 s

    • Subtransient (T’’d): 0.05 s

    • Armature (Ta): 0.04 s

    • Open Circuit Field (T’do): 2.98 s

  • Voltage Regulation Accuracy: ±1.0%

  • Voltage Waveform: <1.5% THD (no-load), <5.0% THD (linear load)

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 system

    • 50 Hz: 2.64 m³/s (4619 cfm)

    • 60 Hz: 3.17 m³/s (5573 cfm)

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

  • Stator: Double-layer winding with 2/3 pitch design eliminating triple harmonics

  • Rotor: Damped rotor dynamically balanced per BS6861 standards

  • Bearings:

    • Drive End: 6319 (ISO, sealed-for-life ball bearing)

    • Non-Drive End: 6228 (ISO, sealed-for-life ball bearing)

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

  • Leads: 12 reconnectable leads for star, delta, or parallel star configuration

  • Inertia (WR²): 32.0076–33.0084 kg·m²

  • Cooling Air Requirement: 2.64 m³/s (50Hz), 3.17 m³/s (60Hz)

  • Winding Resistance:

    • Stator: 0.0016 Ω/phase (22°C, star connection)

    • Rotor: 1.27 Ω (22°C)

Dimensions & Weight

  • Rotor Weight: 1129 kg

  • Stator Weight: 1387 kg

  • Complete Alternator Weight: 2816–2885 kg

  • Shipping Weight (Crated): 2819 kg

  • Packing Dimensions: 194 × 105 × 154 cm

Regulation & Control

  • Excitation System: PMG excitation with brushless AVR

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

  • Voltage Regulation Accuracy: ±1.0%

  • Parallel Operation: Supported (AVR-dependent)

  • Protection Features:

    • Stator winding and bearing overheat protection

    • Anti-condensation heater (optional)

    • Low-speed voltage drop protection

  • 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: 2.64–3.17 m³/s depending on frequency

  • Noise & Vibration: Dynamically balanced per BS6861 mechanical standards

Performance Summary

  • Efficiency Range: 95.1–96.1%

  • 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, refrigeration, railway, and lighting tower generator systems

Datasheet

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