This paper proposes a new outer-rotor permanent-magnet (PM) vernier machine for direct-drive wind power generation, which can offer low-speed operation to directly capture power, and enable high-speed rotating field design maximize the density. Compared with its mechanical gear counterpart, proposed eliminate wear tear as well transmission loss, thus improving generation reliability efficiency. The key is newly introduce flux-modulation poles effectively modulate of armature windings PM...

This paper quantitatively compares two coaxial magnetic gears (CMGs) with different topologies, namely, the CMG installed radially magnetized permanent magnets (CMGRM) and Halbach (CMGHM). By using 3D finite element method, end-effect performances of both CMGs are investigated. Analysis results show that CMGHM can offer higher pull-out torque, lower torque ripple iron losses than CMGRM. Experimental also given for verification.

This paper proposes a linear permanent magnet (PM) machine for direct-drive wave energy harvesting by using magnetic gear. The proposed consists of gear cascaded with PM generator in which the high-speed mover and translator artfully shares same shaft. In short, slow reciprocating motion is directly captured low-speed gear, then amplified speed via to actuate generator, hence producing higher output voltage. By finite element analysis, steady dynamic performances are analyzed, confirms that...

The flux-switching permanent-magnet (FSPM) machine attracts increasing attention recently due to its high power density, robust mechanical structure, good flux-weakening capability, and essential sinusoidal back-electromotive-force waveforms. In previous studies, the approach for analyzing FSPM machines is either by using lumped parameter magnetic circuit models or from "generator-oriented" perspective. this paper, operating principle of reiterated a new perspective, viz., "motor-oriented"...

<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> The flux-switching permanent-magnet (FSPM) machine is a relatively novel brushless having magnets and concentrated windings in the stator instead of rotor, which exhibits inherently sinusoidal back-EMF waveform high torque capability. However, due to airgap flux density produced by salient poles both resultant ripple large, unfavorable for performance drive system. In this paper, conventional...

This paper gives an overview of various electric machines for application to renewable energy harvesting, and reveals the corresponding challenges research opportunities. After introducing energies machines, concept is coined. Then, existing including DC, induction synchronous types, harvesting are challenged. Consequently, opportunities advanced stator-permanent magnet (PM), direct-drive PM magnetless elaborated. Finally, both near-term long-term identifled especially emerging stator-PM,...

Vernier permanent-magnet (VPM) machines attract more and attention recently because of the high-torque density low-speed operation features. Due to vernier structure for field modulation, its power factor (PF) usually is lower than that conventional PM machines. In this paper, a new linear VPM machine improving PF proposed. By using an auxiliary dc winding provide additional excitation, air-gap flux excited by PMs compensated. The proposed has similar split-pole with surface-mounted PMs. For...

This paper investigates open-phase fault modeling and fault-tolerant control (FTC) of dual three-phase permanent magnet synchronous machines (DT-PMSMs). A comprehensive model that considers both the torque reluctance under is proposed first. shows average DT-PMSM will decrease, while ripple increase significantly. Then, a novel optimized FTC approach developed based on model, in which genetic algorithm (GA) applied to optimize stator currents maximize minimize fault. The GA-based are...

To develop a high-performance and reliable control for dual three-phase interior permanent magnet synchronous motor (IPMSM), accurate knowledge of machine parameters is significance. This paper proposes an improved recursive least square (RLS) algorithm current injection-based parameter estimation method PMSM with consideration inverter nonlinearity magnetic saturation. First, the vector space decomposition (VSD)-based model established. The derived, cross saturation self-saturation DQ1-axis...

Flux-switching permanent-magnet (FSPM) motors are a newly developed brushless AC (BLAC) machine having magnets in the stator. This paper proposes and implements stator-flux-oriented (SFO) control strategy for fault-tolerant operation of FSPM motors. The key is to set <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">q</i> -axis component armature current invariant before after fault. In rotor reference frame, by building SFO-...

In this paper, a new type of memory motor, namely flux doubly salient is proposed and tested. The key to incorporate both the online tunable permanent magnets (PMs) magnetizing windings into stator-permanent-magnet motor. Thus, resulting motor can offer effective efficient control. design method presented in detail. By combining piecewise-linear hysteresis model with finite element method, static transient electromagnetic performances are investigated. Experimental results prototype given...

This invited paper gives an overview of various electric machines for application to Electric Vehicles (EVs) and Hybrid (HEVs). First all, the classification a brief introduction EVs HEVs are presented. Then, viable that have been applied HEVs, including DC, induction, Switched Reluctance (SR) Permanent Magnet (PM) brushless types, reviewed. Consequently, advanced PM promising discussed. Finally, integrated introduced, which essential future HEVs.

In this paper, harmonic analysis and comparison of permanent magnet vernier (PMV) magnetic-geared (MGd) machines are presented. The key is to analytically solve the governing Laplacian/quasi-Poissonian field equations in air-gap regions. By using time-stepping finite-element method, analytical method verified. Hence, performances PMV machine quantitatively compared with that MGd machine. results show can offer higher no-load EMF torque-handling capability than its counterpart. Finally,...

In this paper, a novel coaxial magnetic gear (CMG) using bulk high temperature superconductors (HTS) is proposed. By substituting HTS for ferromagnetic material, stationary ring resulted, which can not only provide the desired field modulation effect but also suppress end-effects that commonly occurred in traditional CMG. The performance of proposed CMG assessed and then verified by finite element analysis.

The permanent-magnet hybrid brushless (PMHB) motor adopts both DC field windings and PMs for excitation. It not only offers effective online flux control, but also flexible (BLDC) or AC (BLAC) operations. key of this paper is to investigate two remedial strategies fault-tolerant operations the PMHB drive under open-circuit faults. First, by utilizing excitation boosting, reduced torque due one phase loss can be remedied, so-called BLDC operation mode. Second, reconstructing armature fields...

This paper presents a design approach for doubly salient permanent magnet (DSPM) motors, aiming to minimize the torque ripple. The key is propose criteria that reluctance of all magnetic paths same, and armature windings can be artfully connected compensate variation self-inductance. Based on these criteria, characteristics become symmetric, self inductance suppressed. Thus, resulting ripple minimized. By using time-stepping finite element method, proposed DSPM motor existing are...

This paper presents an analytical approach to calculate the magnetic field distribution in surface-inset permanent magnet motors. A series-slot model is newly proposed describe behavior by a set of partial differential equations terms scalar potentials. The solutions are determined considering boundary constraints. Then, cogging torque characteristic deduced calculating Maxwell tensors. accuracy calculation verified comparing and results with those obtained from finite element method.

The permanent magnet linear vernier (PMLV) machine is becoming attractive for low-speed and direct-drive applications. Due to its structure multipole configuration, the flux leakage especially tooth-tip severe. In order analyze flux, magnetic equivalent network of PMLV applied analytical modeling. During modeling, fringing effect in air-gap taken into consideration. key calculation calculate permeances at different tooth positions. Finally, evaluate proposed model machine, finite element...

This paper presents a comparative study between the nonrare-earth PM and rare-earth PM-based coaxial magnetic gears. First, using finite-element analysis, electromagnetic performances of four gears, which are installed with nonrare- or PMs, analyzed quantitatively compared based on same structure. Then, natural properties PMs evaluated discussed. Finally, cost effectiveness gears adopting different types is assessed. The results show that especially aluminum-nickel-cobalt, preferred for...

With the introduction of doubly salient memory (DSM) motors, flux controllability and hence speed range permanent magnet (PM) motors have reached a new height. This paper presents method to accurately analyze DSM motor. The key is incorporate general expressions Preisach hysteresis model (PHM) AlNiCo-PM into time-stepping finite element (TS-FEM). Based on proposed PHM-TS-FEM, both static transient performances motor are successfully simulated. Finally, validity accuracy verified by...

A tubular linear magnetic gear is proposed, which newly utilizes high temperature superconductor (HTS) bulks for its field modulation. Compared to the conventional one, proposed topology can significantly reduce leakage flux, hence improving force transmission capacity. By using circuit modeling, analytical formulae of air-gap flux density and thrust are firstly derived. Then, finite element method (FEM) employed validate performance gear.

This paper quantitatively compares three types of double-stator flux-modulation permanent-magnet (PM) machines, namely the vernier machine, machine with HTS bulks, and magnetic-geared machine. Due to adopting topology, these PM machines achieve higher energy transmission power conversion than single-stator counterparts. Also, design for proposed are respectively use pole, bulk ring modulating low speed rotating field rotor high armature windings, hence obtaining gear effect operation. It...

This paper proposes and implements a new hybrid chaotic (HC) pulse width modulation (PWM) scheme for the reduction of electromagnetic interference (EMI) in alternating current (AC) motor drives. utilizes logistic mapping to simultaneously chaoize both carrier frequency position. Compared with available PWM schemes such as chaotic-pulse-position-modulated (CPPM) chaotic-amplitude-frequency-modulated (CAFM) PWM, proposed is synergy CPPM-PWM CAFM-PWM. Thus, it possesses characteristic, namely...

In this paper, an 8-pole/12-slot high-speed superconducting bearingless machine is proposed for flywheel energy storage systems. The adopts a homopolar configuration: the rotor only consists of iron lamination with eight salient poles and 12-slot stator accommodates all three groups windings: high temperature (HTS) field winding; armature suspension winding. With HTS winding, in are magnetized as 4-pole-pair electromagnets. Also, by adjusting dc current air-gap flux can be controlled...