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Abstruct-This paper proposes systematic procedures to estimate the circuit parameters of an inverter-fed vector controlled interior permanent magnet synchronous motor when torque measurement is not available.The methodology presented here does not neglect iron losses. New procedures have been developed and justified, because international standard recommendations (IEC standards) cannot be applied.Experimental results from a test rig will be presented in the paper to validate the most important contributions. Thanks to the procedures proposed, secondary effects on the motor parameters, like saturation or frequency dependency, have been evaluated. SYMBOLS AND DEFINITIONS Ld, Lqm P Pcu, Pfe Rs, Rc Rated rms. line current and phase voltage. Airgap current space vector in pu. Equivalent iron-loss current space vector in pu. Input current space vector in pu. Hysteresis and eddy losses in pu at rated flux and rated frequency. d-axis and q-axis inductances in pu. Electromagnetic torque in pu. Pole pairs. Copper losses and iron losses in pu. Equivalent stator copper-loss and iron-loss resistances in pu. Value of Rc at rated frequency. Rated electrical period. Airgap voltage space vector in pu. Input voltage space vector in pu. Airgap flux space vector produced by the permanent magnets in pu. Total airgap flux space vector in pu. Angular speed in pu. Angular frequency in pu. Rated angular speed. Base units Base voltage and current: VB = f i .VN Base angular speed: OB = ON Base angular frequency: qB = P.Q = P.Q Base torque: MB = PB I Q = 3'VN.IN I Q Base inductance: LB = VB I (IB .%e)

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