摘要 :
This article proposes an approach that combines machine learning (ML) and equivalent magnetic circuit (EMC) analysis for the design of surface-mounted permanent magnet synchronous motors (SPMSMs). This is aimed at building a servi...
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This article proposes an approach that combines machine learning (ML) and equivalent magnetic circuit (EMC) analysis for the design of surface-mounted permanent magnet synchronous motors (SPMSMs). This is aimed at building a service platform for non-professional users who need motor designs. The developed method can quickly obtain permanent magnet synchronous motor (PMSM) designs and parameters with a certain level of accuracy without using finite-element (FE) simulation. Therefore, the users can take advantage of the platform and obtain the motor designs in a few seconds. The users only need to input key specifications, such as the torque required, speed, and voltage available, and the ML-based platform can predict and output a design that satisfies the specifications. In this article, an EMC model is first developed, and FE is employed to validate its accuracy. With the EMC, more than 6000 motor models are produced as the data pool for the ML. The ML algorithms are trained by making use of this motor design data pool so that the design platform can be built. Finally, the FE simulations validate the accuracy of the proposed method.
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摘要 :
By measuring the open-circuit radial stray magnetic flux density (RSMFD) of three spatial points, a novel diagnostic method for the eccentricity of interior permanent magnetic motors (IPMSMs) in electric vehicles is proposed. Outp...
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By measuring the open-circuit radial stray magnetic flux density (RSMFD) of three spatial points, a novel diagnostic method for the eccentricity of interior permanent magnetic motors (IPMSMs) in electric vehicles is proposed. Outperforming traditional methods, the proposed method can noninvasively diagnose not only the severities of static eccentricity (SE), dynamic eccentricity (DE), and mixed eccentricity (ME), but also the eccentricity location. In this article, diagnosis results are described through three eccentricity parameters: SE ratio, DE ratio, and SE angle. First, an analytical model of the open-circuit RSMFD of the IPMSM is proposed, with its accuracy validated by experiments. The pattern of the impact of the eccentricity parameters on the open-circuit RSMFD is analyzed to form the basis of the proposed method. Then, an eccentricity prototype motor, which can continuously emulate the eccentricity according to any listed eccentricity parameters, is developed. A test rig is built to collect the open-circuit RSMFD and validate the analytical calculation results. Finally, an eccentricity diagnostic model based on the open-circuit RSMFD is established. The diagnosis results proved the noninvasiveness, effectiveness, and viability of the proposed method.
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摘要 :
An improved analytical method is proposed for predicting magnetic field distribution in the air-gap and permanent-magnet regions of radial field topology of a brushless internal-rotor permanent-magnet motor. It is a two-dimensiona...
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An improved analytical method is proposed for predicting magnetic field distribution in the air-gap and permanent-magnet regions of radial field topology of a brushless internal-rotor permanent-magnet motor. It is a two-dimensional model based on a conformal transformation approach where differences in the current density have been compensated for. The method involves a number of integrals of the vector potential, instead of the scalar potential found in the literature. The method is convenient for magnetic fields having complicated boundaries. The motor model is formulated in polar coordinates and accounts for the large effective air gap, resulting from the low magnetic permeability. Results of the motor analysis are compared with predictions from corresponding finite element analysis and other analytical techniques. They indicate the advantage of the developed approach over other recent analytical techniques.
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摘要 :
This paper proposes a strategy for the optimal design of a synchronous motor with permanent magnets on the rotor surface. The proposed strategy includes several steps during which the general parameters of the rotor arrangements, ...
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This paper proposes a strategy for the optimal design of a synchronous motor with permanent magnets on the rotor surface. The proposed strategy includes several steps during which the general parameters of the rotor arrangements, currents in the stator windings, and the parameters of the slot tooth in the stator are consequently defined. The motor with the optimized cross section demonstrates significantly better performance than its initial prototype. All calculations are performed using industry-standard finite element method software.
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摘要 :
Brushless permanent magnet motors work with a large effective airgap due to the low magnetic permeability, very close to that of air, of modern permanent magnets. This paper presents a developed model for these motors that takes i...
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Brushless permanent magnet motors work with a large effective airgap due to the low magnetic permeability, very close to that of air, of modern permanent magnets. This paper presents a developed model for these motors that takes into account the large difference which exists between the rotor and the stator iron radii. The conventional developed model, for small airgap motors, results as a particular case of the present one. The model is based on a logarithmic conformal transformation that links the motor cylindrical coordinates with the rectangular ones of its developed model. The permanent magnets are also transformed by a scale factor. The connection between magnetic fields is described. Numerical results show the validity of the proposed model. Moreover, a theoretical proof treating the magnetic fields of a current line is also presented.
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摘要 :
The precise knowledge of parameters is of critical importance for the correct performance prediction and design optimization of permanent magnet (PM) motors. A method for numerical calculation of the saturated direct and quadratur...
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The precise knowledge of parameters is of critical importance for the correct performance prediction and design optimization of permanent magnet (PM) motors. A method for numerical calculation of the saturated direct and quadrature reactances X/sub d/, X/sub q/ and excitation voltage due to magnets E/sub 0/, related to any arbitrary operational case, is proposed. Based on the evaluation of internal voltage from nonlinear load magnetic fields by finite-element method, the parameters X/sub d/, X/sub q/, and E/sub O/ are obtained. The proposed procedure has been applied to analyze a laboratory 25 hp PM motor and determine its saturated parameters. There exists a close agreement between the simulation and experimental results.
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摘要 :
For the phenomenon of rotor demagnetization of Permanent Magnet Synchronous Motor(PMSM), studying the dynamic modeling and analysis of demagnetization rotor. Firstly, considering the unbalanced mag...
摘要 :
Due to the complex spatial magnetic field distribution and the variable motion mode, the torque analysis of spherical motors is usually carried out by the finite-element method (FEM) with a large amount of calculation and time con...
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Due to the complex spatial magnetic field distribution and the variable motion mode, the torque analysis of spherical motors is usually carried out by the finite-element method (FEM) with a large amount of calculation and time consumption. In order to improve analysis efficiency, this article proposes a spherical motor torque calculation method based on the permanent-magnet surface current model and Lorentz force, aiming to replace the finite-element calculation. First, the equivalent surface current analytical expression of the rectangular permanent-magnet magnetic field is derived. Then, this expression is used to establish the 3-D magnetic field analytical model of Halbach array permanent magnets in the rotor. Based on this magnetic field, the Lorentz force of the energized stator coil is calculated. Then, the electromagnetic torque generated by the rotor is analyzed. Finally, the analytical results of the magnetic field and the motor torque are compared with those by the FEM and experiments, verified that, under the premise of ensuring the calculation accuracy, the proposed method effectively shortens the calculation time and has higher stability.
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摘要 :
The rotor temperature rise of high voltage line-start solid rotor permanent magnet synchronous motors (HVLSSR-PMSMs) may be too high while operating, which properly causes thermal demagnetization for permanent magnets. Therefore, ...
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The rotor temperature rise of high voltage line-start solid rotor permanent magnet synchronous motors (HVLSSR-PMSMs) may be too high while operating, which properly causes thermal demagnetization for permanent magnets. Therefore, it is necessary to perform the thermal investigation on HVLSSR-PMSM. In this article, a 315-kW, 6-kV HVLSSR-PMSM with the air-cooled hybrid ventilation system is studied in the view of thermal phase. The losses, obtained from the electromagnetic analyses, are applied to the thermal investigation as the distributed heat sources. Whereas, both the mathematical and the geometrical models are proposed for the three-dimensional (3-D) fluid-thermal coupled investigation, from which the fluid velocity and the temperature in motor different components are determined. Whereas, with the hybrid ventilation system, temperatures in motor different components reduce, obviously comparing with those in motor with the original cooling system. The experimental investigations are performed on prototypes in both cases, which verify the calculation results and approve the effectiveness of the proposed hybrid air cooling system as well.
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摘要 :
This article presents a novel structure of a bearingless motor with integrated passive axial electrodynamic suspension. The simple initial structure has been improved in three steps. The structure was upgraded by including additio...
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This article presents a novel structure of a bearingless motor with integrated passive axial electrodynamic suspension. The simple initial structure has been improved in three steps. The structure was upgraded by including additional rings of permanent magnets and rotating back iron yokes in a double rotor structure that embraces the stator. Electrodynamic force generated in the final model was several times higher than that of the initial one. A prototype machine of the final structure was built. The suspension currents and axial electrodynamic forces were validated through an experiment under quasi-static condition, that is, constant rotational speed and fixed axial displacement. Theoretical equations for the axial electrodynamic force were derived. The force equation was compared to the finite-element analysis and experimental results.
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