Power Increasing Magnetic Bearing for Hydropower Generators, part 2
| Reference number | |
| Coordinator | LEMBKE ELEKTROMEKANISKA VERKSTAD LEV AB |
| Funding from Vinnova | SEK 477 000 |
| Project duration | November 2013 - August 2014 |
| Status | Completed |
Purpose and goal
The purpose of the completed project was to investigate the need for vibrationdamping in the rotor shaft in hydropower stations. The demand for damping has increased in conjunction with the extending number of starts and stops which has been forced by the expansion of wind power. Also the requirements of damping during unfavourable operating conditions has been investigated.
Results and expected effects
The results of the studies conducted is that the need for damping during starts and stops might be greater than what has earlier been recognized, and that the costs scenario might need to be adjusted. Installation of magnetic bearings can be an effective way to reduce these vibrations, partly financed by expected energysavings.
Approach and implementation
A number of interviews were conducted with operational managers and rotordynamic experts within Vattenfall to investigate and quantify the problem situation. Simulations have been performed with the Finite Element Method, FEM, to see how to solve the problem magnetically, and what changes in the design of the magnetic bearing are needed to handle the most difficult installations. Studies on the site at Porjus have shown that an installation is possible without major intervention in the existing facility.