SYNCHRONOUS GENERATOR STAR-DELTA DUAL WINDING AND 12-PULSE RECTIFICATION

摘要

This paper examines the rearrangement of the stator winding of a 3-phase synchronous generator to produce a 6-phase output. This machine is configured such that one group of coils are connected in star topology while and other group of coil are configured in delta topology. This thereby produces the opportunity to interface the machine with a 12-pulse rectifier. The redesign of the winding and selection of the appropriate number of turns is presented. A 16 pole, 36 slot machine is evaluated in this paper and finite element results are obtained for multiple load conditions under 12-pulse rectification as well as 6-pulse rectification for comparison. It is shown that, the star-delta connection with 12-pulse rectification reduces the voltage ripple in the range of 25 to 40 V in a 540 V DC link. The machine operates with lower core losses. The machine efficiency observed with 12-pulse rectifier operation is the same with that of 6-pulse rectification.