Abstract
The phenomenon of third-order harmonics in synchronous reluctance motors (SynRMs) with an axially laminated anisotropic (ALA) rotor is studied. The paper shows that a specific rotor geometry can distort the air-gap flux density and induce third-order currents in the stator winding if it is delta connected. The third-order currents in different phases have the same phase shift angle and cannot, therefore, produce a rotating air-gap flux. Instead, they produce an air-gap flux that pulsates in time, and thus, causes eddy current losses in the rotor conducting parts. The phenomenon was described and proven with finite element simulation (FEM) of a 12 kW high-speed ALASynRM. The research underlines the importance of considering the third harmonic phenomenon in the design of a two-pole ALASynRM intended for high-speed applications, where a specific rotor geometry with a wide magnetically conducting middle layer is required.
Highlights
Synchronous reluctance motors with an axially laminated anisotropic rotor (ALASynRM) have been studied since 1966 [1]
The paper has demonstrated the importance of a rotor geometry together with a winding connection in an ALASynRM designed for high-speed applications
It has been shown that the rotor with a special geometry, with a relatively thick magnetically conductive middle layer, can cause strong third-order currents in a delta-connected stator winding
Summary
Synchronous reluctance motors with an axially laminated anisotropic rotor (ALASynRM) have been studied since 1966 [1]. In the case of a delta-connected winding, the third-order saturation- or magnet-shape-related flux density harmonics can induce circulating currents in the winding. By using an ALASynRM as an example, it is shown that the third-order flux density harmonics can be produced by a specific rotor geometry, and as a result, the third-order currents can circulate in a deltaconnected winding. These third-order currents produce a pulsating (nonrotating) magnetic field of their own, which induces additional losses in the conducting rotor parts. The main achievements of the study are summed up in the conclusion, Section V
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