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In the production of surface-mounted permanent magnet machines, manufacturing tolerances also contribute to torque ripple. Additional harmonics of low electrical orders are created in the torque spectrum. Slight manufacturing variations develop asymmetry conditions in the rotor as well as in the stator. Finite element models can be used to analyze the magnitude of pulsating torque generated due to...
During the mass production of surface-mounted permanent magnet motors the rotor and stator geometrical dimensions usually deviate from their nominal values due to manufacturing tolerances which impact machine performance. Radial misalignment in the placement of the permanent magnets on the rotor surface as well as slot opening variations are common deviations observables in the final product. As a...
Synchronous Reluctance motor has recently gained popularity in applications where induction motors are normally employed. Additionally, when permanent magnets are buried in the rotor, they become an alternative for high performance applications. Some of its drawbacks such as high torque ripple and low power factor need to be overcome. The design of Synchronous Reluctance motors with asymmetric flux...
Conventional model for interior permanent magnet synchronous motor (IPMSM) utilizes only the fundamental component of flux linkages in the abc reference frame that means the flux linkages in d- and q- axes are constant quantities with rotor position. An extended analytical model of IPMSM is presented in this paper that incorporates the fundamental as well as the harmonics of flux linkages. The harmonics...
This paper develops an advanced analytical model for the interior permanent magnet synchronous motor to represent the average and transient components of the electromagnetic torque. The conventional flux linkage model is extended to include harmonics in dq-reference frame. Furthermore, the effects of cross-magnetization and saturation on these components are analyzed. The electromagnetic torque derived...
During the mass production of surface-mounted permanent magnet motors the rotor and stator geometrical dimensions usually deviate from their nominal values due to manufacturing tolerances which impact machine performance. One such common tolerance can be noticed in the placement of the permanent magnets on the rotor surface which creates new orders of cogging torque. Finite element models can be used...
The design of Synchronous Reluctance motors with asymmetric flux barriers has been recently used to reduce torque ripple. Finite element models are necessary tool to find the right place and dimensions of the flux barriers as well as to predict the torque harmonics. However, it is time consuming to analyze the model since periodicity and symmetry conditions cannot be used to reduce the model to a...
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