Summary
This paper presents results from a method to handle and manipulate unbalanced magnetic pull (UMP) in synchronous machines. We introduce the UMP fundamentally, describe its negative impact on electrical machines and how it is generally managed. The concept of active magnetic balancing (AMB) for salient pole electrically excited machines is introduced and described in detail. It is a new method to manipulate airgap flux density space harmonics. It can be used to remove undesired forces between the rotor and stator and also create desired ones simultaneously. We describe the early development and state of the art.
Read more Read lessImplementation in electrical machines and questions about hardware is then addressed. The paper finishes by describing two cases where AMB has been implemented and the result it has had on the operation of the units. All examples are from salient pole hydroelectric synchronous electrical machines. The first case described had severe shaft vibration issues when the unit was excited. Vibrations were reduced with more than 70 percent. The next case is a 6-pole machine operating above its first natural frequency. When a magnetic force between the rotor and stator was introduced, vibrations reduced to well below warning limits.
AMB can be seen as a novel method to alleviate vibration issues and extend the service life of the units.
Additional informations
| Publication type | Session Materials |
|---|---|
| Reference | A1_11551_2026 |
| Publication year | |
| Publisher | CIGRE |
| Country | Sweden |
| Study committees | |
| File size | 859 KB |
| Price for non member | 30 € |
| Price for member | 30 € |
Authors
LUNDIN Urban - Magstrom Nordic; LISTENIUS Jonas - Magstrom Nordic; ABRAHAMSSON Johan - Magstrom Nordic; ALTZAR Peter - Fortum Sverige AB; TITZSCHKAU Maximilian - Kraftwerke Oberhasli AG; PÉREZ-LOYA J. José - Magstrom Nordic
Keywords
salient pole synchronous machines, vibration, magnetic balancing, rotor current control, unbalanced magnetic pull
