The Experts below are selected from a list of 18423 Experts worldwide ranked by ideXlab platform

Zi-qiang Zhu - One of the best experts on this subject based on the ideXlab platform.

  • Optimum Injected Harmonics Into Magnet Shape in Multiphase Surface-Mounted PM Machine for Maximum Output Torque
    IEEE Transactions on Industrial Electronics, 2017
    Co-Authors: Kai Wang, Zi-qiang Zhu
    Abstract:

    Harmonics can be injected into the permanent magnet (PM) shape to maximize the Output Torque in five-phase machines. The optimal harmonics of different orders for maximum Torque is mathematically derived and validated by the finite element (FE) method in this paper. The Output Torque of the five-phase machine with sinusoidal shape can be improved by 12.5% by injecting the optimal third harmonic. Meanwhile, 3.2% further more Torque improvement can be obtained with the optimal third and fifth harmonics injected. However, the Output Torque barely change with the seventh harmonic injection. The Torque ripple of the machines with shaped PMs is much lower than the machines with conventional tile PM. The electromagnetic performance for all the machines including back electromotive force, average Torque, Torque ripple, etc., are compared. Finally, the five-phase machine with third and fifth harmonics injection into the rotors is prototyped to verify the analytical and FE analyses.

  • Electromagnetic performance of interior permanent magnet machines with eccentricity
    2013 Eighth International Conference and Exhibition on Ecological Vehicles and Renewable Energies (EVER), 2013
    Co-Authors: Zi-qiang Zhu, Mohd Luqman Mohd Jamil
    Abstract:

    This paper comparatively investigates the electromagnetic performance, such as airgap flux density, flux linkage, radial stress, back-EMF and Output Torque of two rotational symmetrical and asymmetric interior permanent magnet BLDC and BLAC machines having static/rotating eccentricities by FE model and a simple analytical model. It shows that the static/rotating eccentricities hardly affect the back-EMF and Output Torque of symmetrical machine, although they significantly change its airgap flux density and radial stress. On the contrary, both eccentricities can significantly distort the back-EMF and Output Torque of asymmetric machines. Asymmetric machines can have larger Torque ripple with eccentricity than symmetrical machines, although asymmetric machines produce smoother Torque without eccentricity. The static and rotating eccentricities result in many different orders of the back-EMF and Torque components.

Junghwan Chang - One of the best experts on this subject based on the ideXlab platform.

  • Design and Analysis of Surface-Mounted PM Vernier Machines Considering Harmonic Characteristics of Winding MMF
    Energies, 2019
    Co-Authors: Daekyu Jang, Junghwan Chang
    Abstract:

    This paper proposes a design method for the flux modulation poles (FMPs) formed on the stator of surface-mounted permanent magnet vernier machines (SPMVM) considering the winding configurations. In three types of the SPMVM with the different winding configurations, the FMP shapes to maximize the Output Torque are optimized by employing the analytical equations for the magneto-motive force (MMF) due to the windings, permeance, and flux density in the air-gap. Then, the validity of the optimal shapes for the FMPs is verified by the finite element analysis. It is found that the optimal FMP shapes are designed differently in the three types of the SPMVM and increase the Output Torque by different ratios according to the winding configurations. In addition, the experimental results for the prototype show that the proposed method can optimally design the FMP shape by analyzing mathematically the effects of the winding configuration and the FMP shape on the Output Torque of the SPMVM.

Eyhab El-kharashi - One of the best experts on this subject based on the ideXlab platform.

  • Multi-circular flux motor
    Energy Conversion and Management, 2011
    Co-Authors: Eyhab El-kharashi
    Abstract:

    Abstract The paper introduces a new type of electrical machines which has significantly high Output Torque. The toothed-rotor in the conventional electrical machine is replaced by a multi-circular rotor to increase the saliency and to shorten the flux loops consequently the Output Torque increases. The paper presents the design steps of this new type of electrical machine and also examines its performance. In addition, the paper compares the percentage increase in Output Torque from the proposed new electric machine to its equivalent conventional motor. Then the paper proceeds to discuss the relation between the switching on angle and the maximum speed, the Torque ripples, and the efficiency.

  • Shaping the stator teeth of an isolated stator sections switched reluctance motor to deliver high Output Torque
    International Journal of Power and Energy Conversion, 2009
    Co-Authors: Eyhab El-kharashi, P. Salminen
    Abstract:

    In the isolated stator sections 6/8 SRMs, wide stator teeth produce high flux, yet not all of this flux generates Output Torque. For proper design of the 6/8 SRM, the rotor teeth widths are less than the stator teeth widths, which means that not all the flux in the stator transfers to the rotor. In this study, the stator teeth are tapered to optimise the stator flux transfer from the stator to the rotor in order to increase the Output Torque. A comparison between the Torque of the SRM with and without tapered stator teeth is presented.

Pragasen Pillay - One of the best experts on this subject based on the ideXlab platform.

  • Improved Torque performance of switched reluctance Machines by reducing the mutual saturation effect
    IEEE Transactions on Energy Conversion, 2004
    Co-Authors: Yaguang Liu, Pragasen Pillay
    Abstract:

    Switched reluctance machines (SRMs) are normally designed to operate in the saturated region, and phase currents have some overlap to achieve better Output Torque performance. This results in mutual saturation effects. These effects are analyzed in detail in this paper. The experimental results show the influence of both the magnitude and direction of the leading phase current and the influence of the trailing phase current on the flux linkage of the working phase. In addition, the effect of the mutual saturation on the Output Torque is also demonstrated. It shows that a change of the phase winding connections can increase the Output Torque.

Hong Zhou - One of the best experts on this subject based on the ideXlab platform.

  • Synthesis of Constant Torque Compliant Mechanisms
    Journal of Mechanisms and Robotics, 2016
    Co-Authors: Hari Nair Prakashah, Hong Zhou
    Abstract:

    Constant Torque compliant mechanisms produce an Output Torque that does not change in a large range of input rotation. They have wide applications in aerospace, automobile, timing, gardening, medical and healthcare devices. Unlike constant force compliant mechanisms, the synthesis of constant Torque compliant mechanisms has not been extensively investigated yet. In this paper, a method is presented for synthesizing constant Torque compliant mechanisms that have coaxial input rotation and Output Torque. The same shaft is employed for both input rotation and Output Torque. A synthesized constant Torque compliant mechanism is modeled as a set of variable width spline curves within an annular design domain formed between a rotation shaft and a fixed ring. Interpolation circles are used to define variable width spline curves. The synthesis of constant Torque compliant mechanisms is systematized as optimizing the control parameters of the interpolation circles of the variable width spline curves. The presented method is demonstrated by the synthesis of constant Torque compliant mechanisms that have different number of variable width spline curves in the paper.Copyright © 2015 by ASME

  • Synthesis of Constant Torque Compliant Mechanisms
    Volume 5A: 39th Mechanisms and Robotics Conference, 2015
    Co-Authors: Hong Zhou, Hari Nair Prakashah
    Abstract:

    Constant Torque compliant mechanisms produce an Output Torque that does not change in a large range of input rotation. They have wide applications in aerospace, automobile, timing, gardening, medical and healthcare devices. Unlike constant force compliant mechanisms, the synthesis of constant Torque compliant mechanisms has not been extensively investigated yet. In this paper, a method is presented for synthesizing constant Torque compliant mechanisms that have coaxial input rotation and Output Torque. The same shaft is employed for both input rotation and Output Torque. A synthesized constant Torque compliant mechanism is modeled as a set of variable width spline curves within an annular design domain formed between a rotation shaft and a fixed ring. Interpolation circles are used to define variable width spline curves. The synthesis of constant Torque compliant mechanisms is systematized as optimizing the control parameters of the interpolation circles of the variable width spline curves. The presented method is demonstrated by the synthesis of constant Torque compliant mechanisms that have different number of variable width spline curves in the paper.