An　electromagnetic　transmitter　transmits　electromagnetic　waves　with　variable　frequencies　to　the　ground　to　obtain　underground　structure　information　and　the　distribution　of　mineral　resources.　In　order　to　improve　the　power　factor　and　reduce　the　volume　and　weight　of　the　transmitter,　a　novel　transmitter　topology　with　pulse　width　modulation　(PWM)　rectifier　is　designed.　Similar　with　the　flux-oriented　control　in　the　motor　speed　regulation　system,　this　paper　provides　flux-oriented　control　for　a　permanent　magnet　synchronous　generator　PWM　rectifier.　The　mathematical　model　of　the　generator　rectifier　is　established　under　the　rotating　coordinate　system.　Then,　a　novel　decoupling　control　strategy　without　the　exact　value　of　the　generator　stator　inductance　is　proposed　to　regulate　the　active　current　and　the　reactive　current,　and　an　outer　voltage　linear　control　strategy　with　the　control　amount　of　the　square　of　the　voltage　is　proposed　to　regulate　the　output　voltage.　Simulation　and　experimental　results　demonstrate　the　effectiveness　of　the　system.