To　solve　the　problem　of　complex　adjuster　and　permanent　magnets　(PMs)　demagnetization　at　high　temperature,　a　new　type　of　adjustable　permanent　magnet　coupler　(PMC)　with　synchronous　rotating　adjuster　is　proposed,　whose　torque　can　he　adjusted　by　turning　a　switched　flux　angles　between　the　adjuster　and　PMs　along　the　axial　direction.　The　structural　feature　and　working　principle　of　the　PMC　are　illustrated.　The　distribution　of　static　magnetic　field　and　the　air　gap　flux　at　different　switched　flux　angles　are　obtained.　The　torque　curves　are　calculated　in　transient　field　by　using　the　3-D　finite-element　analysis　method.　To　predict　the　torque　characteristics　of　the　PMC,　a　new　analysis　method　is　proposed　which　uses　the　relationship　bebveen　Maxwell　suction　and　the　torque.　The　test　results　show　that　analytical　prediction　can　agree　the　test　data　well　at　low　torque/slip.