Transient Stability in Subsea PMSM with Damper Windings - Using Finite Element Method Simulations to Identify the dq-circuit Parameters of a PMSM with a Damper Winding Sleeve
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- Institutt for elkraftteknikk 
Today, induction machines dominate the market for electrical machines in industrial pumping applications. This is also the case for subsea pumping applications. Permanent magnet machines are showing great promise for taking over this market, but in order for permanent magnet machines to succeed, their stability during load transients must be greatly improved. In this project, the aim has been to analyze the behaviour of a Permanent Magnet Synchronous Motor with damper windings during transients. In addition to stability studies, a main topic if interest has been to develop a method to comprehensively determine the individual direct-quadrant axis parameters of the machine. A particular special case of damper windings, where a metallic sleeve around the rotor does the job of both the damper winding and the magnetic retention sleeve, has been the main topic of investigation. The machine has been tested using three different materials in the damper winding. To perform these simulations, a Finite Element Method software called Ansys Maxwell has been used. A method for determining the dq-axis parameters has been developed, results using this method, in combination with the stability studies, suggest there is a direct relationship between the damper winding resistance and the damping abilities of the machine.