For　the　first　time,　a　direct　electromagnetic　force　closed-loop　control　strategy　for　a　contactor　is　proposed　in　this　article.　First,　an　electromagnetic　force　observer　based　on　a　neural　network　is　designed　according　to　a　binary　one-to-one　mapping　of　the　electromagnetic　mechanism　parameters　to　observe　the　real-time　electromagnetic　force.　Then,　the　real-time　spring　reaction　force　is　obtained　by　combining　the　observed　electromagnetic　force　with　the　mechanical　motion　equation　and　the　spring　reaction　equation.　Finally,　a　constant　force　margin　is　added　to　the　real-time　reaction　force　as　the　reference　curve,　and　the　real-time　observed　electromagnetic　force　is　used　as　the　feedback;　thus,　direct　electromagnetic　force　closed-loop　control　is　realized　through　hysteresis　regulation.　This　scheme　can　control　the　constant　positive　acceleration　of　the　movable　core　in　the　dynamic　process　by　taking　only　the　constant　force　margin　as　the　control　target,　which　ensures　the　reliable　action　of　the　contactor　and　controls　the　total　kinetic　energy　of　the　movable　core　to　control　the　impact　energy　and　inhibit　the　contact　bounces.　Therefore,　the　direct　electromagnetic　force　closed　loop　can　more　accurately　and　directly　realize　the　dynamic　matching　of　the　electromagnetic　force　and　reaction　force,　which　is　of　great　significance　to　the　optimization　control　of　the　contactor　dynamic　process.　©　1982-2012　IEEE.