Medium speed permanent magnet generators, Technical data
| Output power | 55 kW to 5 MW and more |
| Frame size | 280 to 710 |
| Number of poles | 4 - 6 |
| Voltages | 690 V to 3 300 V |
| Frequency | 50 or 60 Hz |
| Cooling | air or water cooled |
| Mounting type | horizontal and vertical |
| Standards | IEC |
Medium speed designs:
Nominal speed can be selected between 100 - 500 rpm using a 1- or 2 stage gearbox. There are three potential ways to implement a medium speed design. The pitch tube for cable passage and the brake disk need to be considered in all designs.
Fully integrated:
- Gearbox and generator share same frame, bearings and shaft.
- Requires joint development project involving gearbox and generator manufacturers
- Scope of supply can range from stator and rotor parts only to full generator.
Semi-integrated:
- Generator is integrated with gearbox via supporting flange.
- Only mounting interface flange and coupling need to be agreed.
- Cooling can be optimized, with more options available.
Modular:
- Generator is separate unit mounted independent of gearbox.
- Similar construction to high speed generator with 3-stage gear.
- Standard generator platform, reliable, cost-efficient, with fast delivery