Low-speed marine shaft generators PTO/PTI 1–12 MW (PM and EESG)
Low-speed shaft generators are intended for taking power off the main engine propeller shaft (PTO mode) and, conversely, for driving the propeller with an electric machine (PTI mode).
- Power
- 1–12 MW
- Rotational speed
- 30–200 rpm
- Excitation
- permanent magnets (PM) or electromagnetic (EESG)
- Number of poles
- 36 (PM) / 16 (EESG)
Price, availability and lead time on request. We help with analogue selection, customs clearance and delivery.
Description
Low-speed shaft generators are intended for taking power off the main engine propeller shaft (PTO mode) and, conversely, for driving the propeller with an electric machine (PTI mode). Using the mechanical energy of the main engine to generate electricity makes it possible to reduce the number or power of auxiliary diesel generators and to cut fuel consumption without reducing the speed of the vessel. Characteristics. Rated power is 1–12 MW, rotational speed 30–200 rpm, and permissible overspeed 120 % for 2 minutes. Two types of machine are produced: permanent-magnet excited (PM, 36 poles, power factor 0.9 in under-excited mode) and electromagnetically excited (EESG, salient-pole, 16 poles, power factor 0.94 in over-excited mode). The frame is welded; the voltage is designed for operation with low-voltage frequency converters, the insulation level is chosen according to the requirements of the converter, the insulation class is H or F, and the windings are impregnated using VPI technology. Mounting is horizontal (IM5510/IM5410), protection degree IP44 (IP54 on request), cooling IC86W, air–water through a double-tube heat exchanger with motor-fans. Design features. The machines are made to individual designs for drilling and offshore vessels, icebreakers, container ships, tankers and research vessels. The design is optimised for minimum noise and vibration, taking into account experience of working to navy standards; the subtransient reactance Xd″, efficiency and dimensions are adapted to the constraints of the project. Electromagnetic, mechanical and thermal calculations are checked; for emergency sets, versions for heel angles of up to ±25° are provided. The shaft generators integrate with any converter and are certified by the main classification societies, including the special notations ICE, ICEBREAKER, POLAR, SILENT, VIBR, COMF, DPS and CLEAN DESIGN. Applications: vessels with PTO/PTI hybrid propulsion systems, icebreakers and ice-class vessels, and the offshore fleet.
Technical specifications
| Power | 1–12 MW |
|---|---|
| Rotational speed | 30–200 rpm |
| Excitation | permanent magnets (PM) or electromagnetic (EESG) |
| Number of poles | 36 (PM) / 16 (EESG) |
| Power factor | 0.9 under-excited (PM) / 0.94 over-excited (EESG) |
| Voltage | for low-voltage frequency converters (LV) |
| Overspeed | 120 %, 2 min |
| Insulation | class H or F, VPI |
| Mounting | IM5510 / IM5410, horizontal |
| Degree of protection | IP44 (IP54 on request) |
| Cooling | IC86W, air–water with double-tube heat exchanger and motor-fans |
Request a price and lead time
Low-speed marine shaft generators PTO/PTI 1–12 MW (PM and EESG). We reply within one business day.
Or email sales@usk.ua or call 044 339-50-20.
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