Rotor　stability　is　an　important　index　of　the　performance　of　a　magnetically　levitated　blood　pump.　In　this　study,　we　developed　a　novel　nutation　blood　pump　using　a　passive　magnetic　spherical　bearing　to　achieve　dynamic　stability　of　a　levitated　rotor.　The　structure　and　working　principle　of　the　proposed　blood　pump　are　first　introduced.　A　mathematical　model　based　on　the　theory　of　equivalent　magnetic　charges　is　derived　to　calculate　the　axial　and　rotational　stiffnesses　of　the　passive　magnetic　spherical　bearing.　Furthermore,　considering　the　gyro　effect　on　the　dynamic　stability,　an　analytical　expression　for　the　gyroscopic　moment　of　the　nutating　rotor　is　deduced.　Finally,　a　prototype　of　a　self-designed　blood　pump　is　fabricated,　and　a　hydraulic　experiment　on　the　real-time　levitation　state　is　carried　out.　Experimental　results　obtained　via　different　sensing　components　show　that　a　continuous　output　flow　rate　of　5　L/min　can　be　obtained　against　a　pressure　head　of　100　mmHg　at　a　rotational　speed　of　1600　rpm,　and　the　output　flow　conditions　are　found　to　be　stable　at　various　pressures.　In　addition,　it　is　found　that　the　rotor　becomes　more　stable　with　increasing　rotational　speed.　The　maximum　fluctuation　of　the　levitated　gap　is　only　0.2　mm　when　the　rotational　speed　of　the　rotor　is　2300　rpm.