This　paper　investigates　the　rotor　dynamic　coefficients　of　a　thrust　active　magnetic　bearing　when　runner　tilt　is　taken　into　account.　The　influence　of　runner　tilt　upon　the　load　capacity　and　the　dynamic　forces　and　moments　of　a　thrust　active　magnetic　bearing　is　analysed.　A　total　of　24　rotor　dynamic　coefficients　are　defined　to　describe　the　dynamic　behaviour　of　the　thrust　active　magnetic　bearing.　A　general　method　is　presented　to　calculate　these　coefficients,　which　can　be　used　conveniently　for　the　coupled　dynamic　analysis　when　a　rotor　is　supported　by　both　radial　and　thrust　magnetic　bearings.