In　this　paper,　a　sensorless　breaking　and　closing　displacement　tracking　control　strategy　for　a　contactor　is　proposed,　which　improves　the　action　consistency　of　the　contactor.　First,　a　parameter　estimator　is　constructed　by　combining　a　neural　network　with　a　mechanical　motion　model,　so　the　electromagnetic　force,　spring　force　and　movable　core　displacement　of　the　whole　process　can　be　estimated　in　real　time　only　by　the　input　coil　current.　Then,　in　the　making　and　breaking　process,　the　outer　displacement　loop　controlling　the　inner　electromagnetic　force　loop　is　adopted　as　a　double　closed-loop　control　based　on　a　fuzzy　algorithm,　and　the　accurate　breaking　and　closing　displacement　tracking　of　the　movable　core　is　realized.　In　the　closing　process,　only　electromagnetic　force　closed-loop　control　is　adopted.　The　electromagnetic　force　is　always　greater　than　the　spring　force　by　setting　an　appropriate　constant　electromagnetic　force　margin.　Therefore,　the　reliable　holding　and　energy-saving　of　the　contactor　can　be　realized　at　the　same　time.　The　feasibility　of　the　proposed　scheme　is　verified　by　simulation　and　experiment.　The　parameter　estimation　method　and　closed-loop　control　strategy　proposed　in　this　paper　are　of　great　significance　to　high-　performance　control　of　electromagnetic　switches.　©2023　Chin.Soc.for　Elec.Eng.