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Medium speed permanent magnet generators (MS PMG)

MS PMGs represent a very compact, slower speed solution offering the highest efficiency with low maintenance needs. ABB produced the world´s first MS PMG Multibrid-type design in 2000: this has the turbine main bearing and PM generator integrated with a single-stage gearbox.

Benefits
  • Compact size with low turbine top-head mass
  • For multi-MW powers up to 15 MW
  • Highest efficiency levels (over 98 %) at all turbine speeds
  • Cost-efficient with low magnet mass

Technical data for medium speed generators up to 15 MW

Frame size
710-1600
Power
1-15 MW
Nominal speed
between 100-500 rpm
Efficiency
Over 98% (also at 20% load)
Cooling
Water cooled
Voltage
690, 1000-3300 V or higher
IC81W / IC86W / IP55 (TEWAC)
Frequency
50 and 60 Hz
Ambient
Standard: -20 °C ... +50 °C
Low temp: -30 °C ... +50 °C
Typical dimensions in
500 rpm design
(L x W x H, weight)
3 MW: 2400 x 1800 x 2000 ; ~ 12.5 tn
5 MW: 2900 x 3000 x 3350 ; ~ 18.2 tn
7 MW: 2900 x 3300 x 3600 ; ~ 24.9 tn

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