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Flux reversal permanent magnet machines (FRPMMs) exhibit many advantages such as simple rotor configuration, high torque density, fast transient response, etc. However, the general design procedure of FRPMMs has not been established. Thus, this paper mainly focuses on developing a design methodology of three-phase FRPMMs. First, the sizing equations are analytical derived based on a magneto motive...
Due to the advantages of high torque density and simple mechanical structure, vernier permanent magnet (VPM) machines have attracted more and more research interests. In this paper, the inductance non-linearity of an advanced concentrated winding (CW) VPM machine is investigated with consideration of both magnetic saturation and cross coupling saturation. Then, the mathematical model with variable...
This paper proposes a novel predictive duty ratio modulated direct torque control (DTC) for vernier permanent magnet synchronous motor drive to reduce the torque and flux ripples caused by hardware delay. Compared with DTC, conventional duty ratio modulated DTC (DDTC) can significantly reduce the torque and flux ripples, while hardware delay still deteriorates the performance of DDTC. This paper analyzes...
This paper investigates a novel harmonic current injection method to optimize air-gap and yoke flux density distribution for multiphase motor simultaneously. The effect of harmonic currents on air-gap flux density and yoke flux density is analyzed as a whole. The proposed method fully makes use of multiple control freedoms, and the optimal coefficients for corresponding harmonic current are derived...
This paper aims to provide some useful instructions to electromagnetic design of high-speed permanentmagnet machines. In this paper, the electromagnetic design procedure is illustrated with a 2 poles 40,000 rpm prototype machine. In order to determine a rotor structure with good performance, rotor design including rotor structure, pole arc and magnetization direction of magnets are analyzed respectively...
This paper aims to compare ring permanent magnet rotor and solid cylinder permanent magnet rotor for high-speed permanent magnet synchronous machine. Due to the difference between structures, sleeves of two kinds of rotors are made of different materials. Thus, assembling methods of sleeves and their thicknesses vary. Moreover, electromagnetic properties are also influenced. Then measures are taken...
Vernier permanent magnet (VPM) machines have gained growing interest in recent years due to several advantages, including high torque density and simple mechanical structure. This paper presents a thorough investigation on the nature of fractional slot vernier permanent magnet (FS-VPM) machines with regular stator topology. Through analytical derivation, the configuration and performance of two winding...
The recent novel DC biased sinusoidal current reluctance machines (DC-biased VRMs) are similar to switched reluctance machines (SRMs) in terms of structure, as they both adopt the doubly salient structure and concentrated windings. However, the special characteristic of DC-biased VRMs is that their phase currents have both DC current and AC current. Therefore, it can be inferred that the vibration...
This paper mainly deal with the radial force and vibration of the surface-mounted permanent magnet vernier machine (SPMVM) with the integer slot distributed windings (ISDW) and the fractional-slot concentrated windings (FSCW). The harmonic order and frequency of the radial force in SPMVM with the permanent magnet surface-mounted on rotor or stator tooth are detailed discussed by the analytical and...
The split ratio is a significant parameter which affects the torque output and efficiency of permanent magnet machines. It has been optimized for obtaining the maximum torque output with a fixed maximum allowable copper loss or current density as the thermal constraints in the current findings. However, these indirect thermal constraints could be influenced by the split ratio due to the changing machine...
This paper investigated the post-fault operation of a novel six-phase double-stator axial flux permanent magnet machine with detached winding configuration, which was found to be superior to existing winding configuration in previous study. However, the unbalanced magnetic force problem still remains unsolved. In this paper, the axial force balancing control principle is proposed and a group of specific...
This paper presents a triple-rotor axial-flux spoke-array vernier permanent magnet (TR-AFSAVPM) machine to enhance the performance of vernier machines. By cooperating spoke-array rotor and coil-wounded winding, power factor and torque density of the proposed machines are much improved and their copper utilization is reduced as well comparing with conventional vernier machines. Firstly, the machine...
In recent years, permanent magnet (PM) vernier machines have gained more and more attentions due to their high torque density and simple mechanical structure. However, vernier PM machines with lap windings always suffer from long end winding length, and regular non-overlapping winding may result in torque reduction for PM vernier (PMV) machines. In this paper, an advanced PM vernier (APMV) machine...
In high-speed permanent-magnet synchronous machines (PMSMs), the permanent magnets (PMs) are usually retained by high strength sleeves. Metallic sleeves are preferred in some cases where a high rotor stiffness is required. However, high frequency time and spatial harmonics of the air-gap field would induce considerable eddy-current losses in the conductive sleeve, and thus exposing the PMs to risk...
Stator DC winding Excited Vernier Reluctance Machines (DC-VRMs) are a kind of novel machines, which are investigated more and more owing to absence of expensive permanent magnet material. However, DC-VRMs are found to have large torque ripple if they are not carefully designed. There are a lot of existing methods to reduce the cogging torque in permanent magnet (PM) machines, but the design techniques...
Due to the high torque density and sharing similar operating principles with vernier machines, the magnetic-geared permanent magnet machines have been gaining more attention recently. This paper focuses on power transferring feature of a magnetic geared machine among the stator, modulation layer and rotor by analytical methods. Analytical equations of the back electromotive force, torque and power...
Online parameter estimation could improve the performance of sensorless control. In this paper, a super-twisting algorithm (STA) based second-order sliding-mode observer (SMO) sensorless control with online stator resistance estimation is proposed. The chattering problem and time delay, which could not be avoided in conventional SMO, are eliminated in this STA based second-order SMO. At the same time,...
Based on the flux modulation principle, this paper proposes a novel brushless dual-electrical port dual mechanical port (DEDM) machine. From the view of derived torque equations, the proposed topology can be regarded as a combination of a motor/generator with a brushless magnetic continuously variable transmission. First, the structure and operation principle of the proposed machine are introduced...
In this paper, a novel class of hybrid excitation, stator vernier permanent magnet (VPM) machines (HE-VPM) are proposed. The proposed machines are with salient rotor structure, stator located PMs, and concentrated armature windings. Therefore, the superiority of the proposed machine is robust rotor structure, short and non-overlapping end-winding, and easy heat dissipation. Besides, a novel DC-biased...
DC-biased sinusoidal current vernier reluctance machines (DC-biased-VRMs) are with a doubly salient structure, and their phase currents contain an alternating current (AC) component and a direct current (DC) component. Hence, their main features are one set of concentrated windings compared with variable flux reluctance machines (VFRMs), low vibration and noise due to smooth current, compared with...
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