Wide-Speed Range Operation of PM Vernier Machines Using Wye and Wye-Delta Winding Configurations

Arif, Arsalan; Baloch, Noman; Ayub, Muhammad

doi:10.1109/access.2020.3023763

Cited by 5 publications

(3 citation statements)

References 31 publications

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“…Another flux-controllable vernier machine is also presented in [21] which integrates the merits of lowspeed high-torque operation and high-speed flux weakening control. The theoretical discussion and FEM simulation analysis of the wide speed range operation of PMVM is presented in [22]. There are few experimental studies to exhibit the high-speed characteristics of the PMSMs that have been tested and then documented in technical research papers for broad research purposes [23].…”

Section: Introductionmentioning

confidence: 99%

Experimental Verification of Dual Airgap PMVM Having Yokeless Rotor for Extended Speed Application

Siddiqi

Yazdan

et al. 2022

IEEE Access

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Permanent magnet vernier machines (PMVM) are recently proven to be a good candidate for extended-speed operation in the constant power region. In this paper, a dual-airgap PMVM having a yokeless rotor has been presented for extended-speed operation. The PMVM model is designed with two stators and a sandwiched rotor without an iron yoke. To achieve the extended speed operation, the yokeless structure of dual airgap PMVM benefits from the increased inductance which makes it possible to operate at higher speeds. For this purpose, the prototype of this machine is built, and experimental testing is performed to verify its performance in a constant power region. Electromagnetic performance such as back EMF and output torque at high speeds are analyzed. The experimental results are compared with those obtained using finite element analysis which confirms the ability of dual airgap PMVM having a yokeless rotor to perform well at higher speeds in a constant power region.INDEX TERMS Dual airgap PMVM, radial type, yokeless rotor, extended speed operation, finite element method, experimental verification.

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Section: Introductionmentioning

confidence: 99%

Experimental Verification of Dual Airgap PMVM Having Yokeless Rotor for Extended Speed Application

Siddiqi

Yazdan

et al. 2022

IEEE Access

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“…Benefiting from the "magnetic gearing effect", permanentmagnet vernier machines (PMVMs) have the inherent advantage of high torque density and can directly drive the load without the help of intermediate transmission devices such as mechanical gearboxes, thus making PMVMs outstanding candidates for direct drive applications [1][2][3][4][5][6]. To date, various topologies have been proposed for PMVMs with high performance.…”

Section: Introductionmentioning

confidence: 99%

Quantitative Analysis of Back-EMF of a Dual-Permanent-Magnet-Excited Machine: Alert to Flux Density Harmonics Which Make a Negative Contribution to Back-EMF

Shi

Zhong

Jian³

2021

IEEE Access

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Recently, the dual-permanent-magnet-excited (DPME) machine has attracted growing attention due to its high torque density. Due to the bidirectional field modulated effect (BFME), airgap flux density harmonics (AFDHs) are more complex and abundant than traditional permanent magnet synchronous machines (PMSMs). Moreover, the back-electromotive force (EMF) generated by AFDHs is also complex. Unfortunately, only a few papers qualitatively analyze back-EMF. The qualitative analysis for back-EMF can reveal some important conclusions; for example, only AFDHs meeting specific pole pair numbers (PPNs) can generate back-EMF. However, it may also ignore some details and valuable findings. In this paper, a purely analytical magnetomotive force (MMF) permeance model (PAMPM) for a DPME machine is built to quantitatively analyze the back-EMF. The PAMPM does not require a numerical method, such as conformal transformation. With the PAMPM, AFDHs that contribute to the generation of back-EMF can be recognized and quantified. Interestingly, AFDHs with m2p2=np3 cause PM flux-linkage to have a dc bias, and not all AFDHs play a positive role in the generation of back-EMF. The main recognition results are as follows: 1) the S-II and R-II types of AFDHs in a 12/10 DPME machine overall make a negative contribution to the generation of back-EMF; and 2) AFDHs with PPN=22 in the two types mainly cause a negative contribution. To further verify the above results, 2D finite element simulation and experimental tests of a prototype machine are also conducted.

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“…The IMs utilized in the industry are designed to operate either in star or delta winding configuration. Online winding changeover techniques are a common practice either for inverter-fed [15][16][17][18][19][20] or for direct-online (DOL) [21][22][23] operated electrical machines. Within DOL motors, star-delta switches are predominantly used to improve the motor power factor and efficiency.…”

Section: Introductionmentioning

confidence: 99%

Current Ripple Reduction of Predictive Torque-Controlled Induction Motor Drive Using Delta-Star Switchover

et al. 2021

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The current and torque ripple of inverter-fed induction motor drives is an inherent problem of control strategies working with switching frequencies in the range of multiple kilohertz, such as direct torque and, more recently, predictive torque control. If the drive operates in a wide-speed and wide-torque range and is equipped with a machine with an accessible terminal block whose winding is nominally connected in delta, then the current and torque ripple can be reduced by utilizing the delta-star winding changeover technique. When the winding configuration is switched from delta to star, the instantaneous motor phase voltage peak is lowered, and its total harmonic distortion is reduced. However, the control strategy must be adjusted according to the actual winding topology, mainly due to the difference in the coordinate transformations of the measured currents and the difference between the phase voltage vectors obtained from the inverter. This paper proposes a predictive torque control of an induction motor drive with a switchable delta-star winding configuration. The paper is supported by theoretical background, and the key idea is verified by simulations in MATLAB/Simulink and experiments conducted on a dSPACE-controlled 5.5-kW laboratory drive. The simulations validated the presented equations and show the effects of not respecting the actual winding topology. The experiments mainly focused on analyzing the total harmonic distortion of the currents and consumed electrical power in multiple operating points.

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Wide-Speed Range Operation of PM Vernier Machines Using Wye and Wye-Delta Winding Configurations

Cited by 5 publications

References 31 publications

Experimental Verification of Dual Airgap PMVM Having Yokeless Rotor for Extended Speed Application

Experimental Verification of Dual Airgap PMVM Having Yokeless Rotor for Extended Speed Application

Quantitative Analysis of Back-EMF of a Dual-Permanent-Magnet-Excited Machine: Alert to Flux Density Harmonics Which Make a Negative Contribution to Back-EMF

Current Ripple Reduction of Predictive Torque-Controlled Induction Motor Drive Using Delta-Star Switchover

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