Effect of V Angle Variation and Strengthening Rib On Performance Characteristics of IPMSM Motor for Electric Vehicles
02 Jan 2021-
TL;DR: In this article, the effect of permanent magnet V angle variation and the presence of strengthening rib on the torque at maximum torque per ampere (MTPA) and speed profile of the machine for a constant current space vector was investigated.
Abstract: The use of rare earth magnets in interior permanent magnet synchronous machines increases the manufacturing cost of the motors used for electric vehicles and hybrid electric vehicles. Total generated torque at maximum torque per ampere (MTPA) point could be increased by extracting more reluctance torque due to machine saliency instead of increasing stator current or the permanent magnet volume in the rotor. This paper focuses on the effect of permanent magnet V angle variation and the presence of strengthening rib on the torque at the MTPA and speed profile of the machine for a constant current space vector while keeping magnet volume and width of top ribs same in the machine. Finally, a design procedure is provided to select the near optimum V angle for a given magnet volume, which reduces the computations required without using complex optimization algorithms.
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29 Nov 2022
TL;DR: In this paper , the electromagnetic field characteristics according to the rib thickness of each layer of an IPMSM having a double V-type structure were analyzed using an 8-pole 72-slot 300kW class model.
Abstract: In this paper, the electromagnetic field characteristics according to the rib thickness of each layer of IPMSM having a double V-type structure were analyzed. Using an 8-pole 72-slot 300kW class IPMSM as a standard model, the tendency of electromagnetic field characteristics according to rib thickness was confirmed through RSM, and two comparative models with different rib thicknesses were selected for comparison and analysis with the standard model. Finally, the optimization was carried out within the thickness range close to the standard model’s rib thickness by considering the minimum to maximum thickness of the rib and the stress of the rotor. As a result of the analysis, when the rib thickness of the 1 layer was thin and the rib thickness of the 2-layer was relatively thick, the electromagnetic field characteristics were improved in low-speed operation. In the case of high-speed, when the rib of the 2-layer was thinner than that of the 1-layer, the electromagnetic field characteristics were improved.
29 Nov 2022
TL;DR: In this paper , the electromagnetic field characteristics according to the rib thickness of each layer of an IPMSM having a double V-type structure were analyzed using an 8-pole 72-slot 300kW class model.
Abstract: In this paper, the electromagnetic field characteristics according to the rib thickness of each layer of IPMSM having a double V-type structure were analyzed. Using an 8-pole 72-slot 300kW class IPMSM as a standard model, the tendency of electromagnetic field characteristics according to rib thickness was confirmed through RSM, and two comparative models with different rib thicknesses were selected for comparison and analysis with the standard model. Finally, the optimization was carried out within the thickness range close to the standard model’s rib thickness by considering the minimum to maximum thickness of the rib and the stress of the rotor. As a result of the analysis, when the rib thickness of the 1 layer was thin and the rib thickness of the 2-layer was relatively thick, the electromagnetic field characteristics were improved in low-speed operation. In the case of high-speed, when the rib of the 2-layer was thinner than that of the 1-layer, the electromagnetic field characteristics were improved.
References
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TL;DR: The main conclusion drawn by the proposed comparative study is that it is the cage IM that better fulfills the major requirements of the HEV electric propulsion.
Abstract: This paper describes a comparative study allowing the selection of the most appropriate electric-propulsion system for a parallel hybrid electric vehicle (HEV). This paper is based on an exhaustive review of the state of the art and on an effective comparison of the performances of the four main electric-propulsion systems, namely the dc motor, the induction motor (IM), the permanent magnet synchronous motor, and the switched reluctance motor. The main conclusion drawn by the proposed comparative study is that it is the cage IM that better fulfills the major requirements of the HEV electric propulsion
643 citations
TL;DR: A comparison between interior PM and surface-mounted PM (SPM) motors is carried out, in terms of performance at given inverter ratings, showing that the two motors have similar rated power but that the SPM motor has barely no overload capability, independently of the available inverter current.
Abstract: Electric vehicles make use of permanent-magnet (PM) synchronous traction motors for their high torque density and efficiency. A comparison between interior PM and surface-mounted PM (SPM) motors is carried out, in terms of performance at given inverter ratings. The results of the analysis, based on a simplified analytical model and confirmed by finite element (FE) analysis, show that the two motors have similar rated power but that the SPM motor has barely no overload capability, independently of the available inverter current. Moreover, the loss behavior of the two motors is rather different in the various operating ranges with the SPM one better at low speed due to short end connections but penalized at high speed by the need of a significant deexcitation current. The analysis is validated through FE simulation of two actual motor designs.
404 citations
TL;DR: The research results indicate that the IPMSM with V-shape PMs is more satisfying with comprehensive consideration, and the back-electromotive force (EMF), flux leakage coefficient, average torque, torque ripple, cogging torque, power per unit volume, power factor, and flux-weakening ability are investigated.
Abstract: As a kind of traction device, interior permanent-magnet synchronous machines (IPMSMs) are widely used in modern electric vehicles. This paper performs a design and comparative study of IPMSMs with different rotor topologies (spoke-type PMs, tangential-type PMs, U-shape PMs, and V-shape PMs). The research results indicate that the IPMSM with V-shape PMs is more satisfying with comprehensive consideration. Furthermore, the IPMSM with V-shape PMs is investigated in detail. The influences of geometrical parameters (magnetic bridge and angle between the two V-shape PMs under each pole, etc.) on the performances of V-shape motor are evaluated based on finite-element method (FEM). For accurate research, the effects of saturation, cross-magnetization, and the change in PM flux linkage on d - and q -axis inductances are considered. The back-electromotive force (EMF), flux leakage coefficient, average torque, torque ripple, cogging torque, power per unit volume, power factor, and flux-weakening ability are investigated, respectively. The experimental results verify the validity and accuracy of the process presented in this paper.
373 citations
01 Mar 2017
TL;DR: In this paper, three different IPM rotor design configurations, which have been used in electrified powertrains from Toyota, Nissan, and General Motors, are comparatively investigated and compared for motor performance, torque segregation, demagnetization, mechanical stress, and radial forces.
Abstract: Traction motors play a critical role in electrified vehicles, including electric, hybrid electric, and plug-in hybrid electric vehicles. With high efficiency and power density, interior permanent magnet (IPM) synchronous machines have been employed in many commercialized electrified powertrains. In this paper, three different IPM rotor design configurations, which have been used in electrified powertrains from Toyota, Nissan, and General Motors, are comparatively investigated. Each topology is redesigned and improved to meet new design requirements based on the same constraints. The designed motors are then compared and comprehensively evaluated for motor performance, torque segregation, demagnetization, mechanical stress, and radial forces. The results suggest that the single V-shaped configuration achieves the best overall performance and is thus recommended as the best candidate.
187 citations
TL;DR: The authors propose to combine an accurate finite-element analysis with a multiobjective optimization procedure using a new algorithm belonging to the class of controlled random search algorithms to design three-phase interior permanent magnet synchronous motors with minimum weight, maximum power output, and suitability for wide constant-power region operation.
Abstract: This paper proposes the design optimization procedure of three-phase interior permanent magnet (IPM) synchronous motors with minimum weight, maximum power output, and suitability for wide constant-power region operation. The particular rotor geometry of the IPM synchronous motor and the presence of several variables and constraints make the design problem very complicated. The authors propose to combine an accurate finite-element analysis with a multiobjective optimization procedure using a new algorithm belonging to the class of controlled random search algorithms. The optimization procedure has been employed to design two IPM motors for industrial application and a city electrical scooter. A prototype has been realized and tested. The comparison between the predicted and measured performances shows the reliability of the simulation results and the effectiveness, versatility, and robustness of the proposed procedure.
157 citations