Papers by Danilo Riquelme
MDPI Electronics, 2020
This paper analyzes the impact of manufacturing tolerances on the cogging torque of a 24-slot 28-... more This paper analyzes the impact of manufacturing tolerances on the cogging torque of a 24-slot 28-pole tooth-coil-winding permanent magnet synchronous machine with modular stator core (TCW-MPMSM). Dimensional tolerances and asymmetries associated with the modular topology are studied by means of finite element simulations to identify key parameters which generate additional cogging torque compared to the flawless machine. It was found that angular displacement, radial displacement, and tooth-tip width deviations of the stator segments have the most significant impact on the cogging torque among five selected dimensional parameters. A full-range tolerance analysis is carried out by means of a proposed superposition-based approach, considering all possible combinations of typical tolerance values over the three key parameters. It was also found that the increase of the peak-to-peak value due to tolerances is approximately independent of the flawless tooth-tip width and the arc-to-pole ratio. Cogging torque robustness for TCW-MPMSM depends on both the tightness of the tolerances handled in the manufacturing process and the rated cogging torque: the lower the cogging torque of the ideal machine, the less robust is the machine and, consequently, manufacturing imperfections will require to be tightened.
2022 IEEE International Conference on Automation/XXV Congress of the Chilean Association of Automatic Control (ICA-ACCA)
2021 IEEE Energy Conversion Congress and Exposition (ECCE), 2021
This work aims to identify and analyze the impact of static and dynamic eccentric tolerances on r... more This work aims to identify and analyze the impact of static and dynamic eccentric tolerances on relevant performance measures of permanent-magnet synchronous-machines with modular stator core (MPMSMs). A 24-slot 28-pole machine with U-shape stator modules is evaluated by means of the finite element method. Also, a non-modular 24-slot 28-pole machine is assessed to compare the sensitiveness of modular vs non-modular PMSMs. Electromagnetic torque, cogging torque, back-emf, and the radial forces acting on the rotor were analyzed. It was found that most of the evaluated performance indices are not influenced by eccentric tolerances. However, a few relevant variables are severely affected, which could potentially endanger the mechanical integrity of the machine.
Electronics, 2020
This paper analyzes the impact of manufacturing tolerances on the cogging torque of a 24-slot 28-... more This paper analyzes the impact of manufacturing tolerances on the cogging torque of a 24-slot 28-pole tooth-coil-winding permanent magnet synchronous machine with a modular stator core (TCW-MPMSM). Dimensional tolerances and asymmetries associated with the modular topology are studied by means of finite element simulations in order to identify key parameters that increase the cogging torque above the expected values of a faultless machine. Among five selected dimensional parameters, it was found that angular displacement, radial displacement, and tooth–tip width deviations of the stator segments have the most significant impact on the cogging torque. Considering these three key parameters, a full-range tolerance analysis is carried out by means of a proposed superposition-based approach, evaluating all possible combinations of typical deviation values. It is concluded that the cogging torque increment, generated by tolerances, is relatively independent of the faultless tooth–tip wid...
Applied Sciences
Addressing stator-rotor misalignment, usually called eccentricity, is critical in permanent magne... more Addressing stator-rotor misalignment, usually called eccentricity, is critical in permanent magnet (PM) machines since significantly high radial forces can be developed on the bearings, which can trigger a major fault and compromise the structural integrity of the machine. In this regard, this paper aims to provide insight into the unaddressed identification and analysis of the impact of eccentric tolerances on relevant performance indices of permanent magnet synchronous machines (PMSMs) with modular stator core. Static and dynamic eccentricity are assessed for different slot/pole combinations through the finite element method (FEM), and the results are compared with those of PMSMs with a conventional stator core. The unbalanced magnetic forces (UMF), cogging torque, back-emf, and mean torque variations are described and related to the eccentricity magnitude and classification. The main findings indicate that severe radial forces and significant additional cogging torque harmonics a...
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Papers by Danilo Riquelme