In this paper, the two methods used and compared for obtaining the values of direct axis and quadrature synchronous reactance, as well as leakage reactance of the permanent magnet synchronous motor with radial magnets (RPMSM) are: analytical calculation of parameters, and the standstill tests, with locked rotor. The rotor of the motor studied in this paper contains embedded symmetrical sections of aluminum molded squirrel cage. The stator phase winding consists of two sets of turns that can be connected either, in parallel or series, providing a dual voltage connection of the PMSM across three-phase 230V or 460V. The two methods described in this paper showed good correlation of results. These resulting values are required as inputs for the specification of the controller parameters of AC drives using RPMSM.Index Terms-Permanent magnets (PM), synchronous reactance, radial permanent magnets synchronous motor (RPMSM), Samarium Cobalt (SmCo)
SYMBOLS AND NOMENCLATUREf n -nominal frequency V A , V B , V C -line to neutral (phase) voltages of the stator L AA , L BB , L CC -Stator phase winding self-inductance M AB , M BA , M BC , M CB , M CA , M AC -Stator phase winding mutual inductance M D -mutual Inductance between the stator phase winding and the "d-axis" component of the rotor damper winding M Q -mutual Inductance between the stator phase winding and the "q-axis" component of the rotor damper winding Θ-angle between the rotor "d-axis" and the stator "Aphase" magnetic axis L sd , L sq -stator synchronous inductance along the "d", "q" axis L ad , L aq -stator magnetizing inductance along the "d", "q" axis R 1 -stator resistance X sd , X sq -direct ("d-axis") and quadrature ("q-axis") reactance X ad , X aq -direct ("d-axis") and quadrature ("q-axis") magnetizing reactance ω n -nominal frequency in rad/s i A , i B ,i C -phase currents for the stator windings i D , i Q -currents in the "d-axis", respectively "q-axis" rotor damper windings ψ A , Ψ B ,Ψ C -phase fluxes of the stator windings Ψ D , Ψ Q -magnetic fluxes of the "d-axis", respectively "qaxis" rotor damper windings Ψ PM -flux due to the permanent magnets per phase
INTRODUCTIONThe applications of Permanent Magnet (PM) AC machines may be divided into two main types: PM Synchronous (PMSM) and Brushless DC (BLDC). PMSMs and BLDCs became available for many applications, following advances in power electronic devices, topologies for converters, control strategies and rare earth permanent magnet materials.The advantages of these types of machines compared to the wound rotor (electrical excitation) synchronous machines are described elsewhere [1]-[4] and are summarized here. There is no electrical power dissipated in the excitation circuit which accounts for the overall increased efficiency for PMSM. Usually, the efficiency for a PMSM is higher than a synchronous motor of classical construction with the same rated power and speed, for similar load conditions. PMSM can operate at a higher specific torque and shaft power with respect to motors using wound rotor excitat...