400 Hz Ground Power Units

400 Hz industrial alternators for aviation ground power units generator sets

400 Hz alternators for aviation ground power units generator sets Nidec Leroy-Somer, world leader in alternators from 10 to 35,000 kVA, has been manufacturing a range of special frequency products destined for the aircraft industry, for the last 30 years.
Expertise in design and manufacturing ensure that each Nidec Leroy-Somer product meets the technical requirements of this exacting application.
The 400Hz alternators are brushless, self-excited generators (Shunt excitation), with the D550 digital AVR fitted as standard.
They meet the principal international standards, notably: IEC 60034-1.

Electrical characteristics

  • Voltage: 200V (L-L) / 115V (L-N) adjustable to ± 5%
  • Insulation class H
  • Power factor: 0.8
  • Transient voltage dip ≤ 10% for 50% load variation
  • Harmonic rate < 3% at no load
  • Recovery time ≤ 500 ms
  • D550 digital AVR specifications:
    - Voltage accuracy ± 1% on balance linear load
    - Under speed protection
    - Integrated radio interference suppressor
    - Mounted inside the terminal box

Mechanical characteristics

  • Single-bearing IM2005
  • Two-bearing IM2001
  • Steel frame and steel / cast-iron / aluminum end shields
  • Cylindrical and standardized shaft end for two-bearing
  • Sealed for life bearings
  • IP 23 protection, self-ventilated alternator

Operating conditions

  • Ambient temperature: -20°C and +50°C.
  • Altitude up to 1000m


  • Radio interference suppressor

Alternator 400Hz GPU on runway

  • Downloads
  • D550 regulator

    Our latest D550 Digital AVR is compatible with all our 400 Hz alternators.
    It is equipped with several advanced protections and integrates a visual interface (EasyReg Advanced Software), that enables users to read configuration values and parameters.

    The D550 has also been optimized for grid parallel operations and complies with the latest grid code regulations.

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