Design and Performance Research of a Novel Iron-Core Permanent Magnet Compensated Pulsed Alternator with Segmental Squirrel-Cage

Compensated pulsed alternator (CPA) can realize transient high current discharge by compressing magnetic field through compensating element, which has important application in pulse power field. The compen- sation shield and short circuit compensation winding are usually used as compensation elements, but the local compensation effect will be affected by the opposite eddy currents or conductor currents under other poles at maximum discharge time. To solve this problem, a novel iron-core permanent magnet CPA (PMCPA) with segmental squirrel-cage is proposed in this paper. At the time of maximum discharge, the bars' current of each segmental squirrel-cage segment will not be affected the bars' currents in opposite direction of other segments, which has better local compensation effect. In addition, the permanent magnet (PM) excitation eliminates the brush and slip ring and improves the reliability of operation. First, the design basis and scheme of the PMCPA are introduced. Second, the dynamic mathematical model of the PMCPA is presented. Third, the finite-element model of the PMCPA is established to analyse. Fourth, the prototype is manufact- ured to test and validate. Through analysis and verification, the superiority of segmental squirrel-cage compensation is proved, which provides a new idea for the optimization and development of compensation elements.