A nonlinear adaptive lumped parameter magnetic circuit model is developed to predict the electromagnetic performance of a flux-switching permanent-magnet machine. It enables air-gap field distribution, back-electromotive force (back-EMF) waveform, winding inductances, and torque be calculated. Results from are compared with finite-element predictions validated experimentally. The influence end effects also investigated, optimal design parameters, such as rotor pole width, stator tooth ratio...

A new brushless doubly-salient permanent-magnet machine called the flux-reversal is described. Design, analysis, construction, and experimental results for a prototype built as single-phase, high-speed generator are presented. Qualitative comparisons made with other types of machines in its class, using flux-MMF diagram technique. An elementary CAD program developed designing associated drive electronics also

A three-phase, multi-tooth flux-switching permanent magnet brushless ac machine is analyzed, its electromagnetic performance, viz., the phase flux-linkage and back-EMF waveforms, self- mutual-inductances, cogging torque, torque-current characteristic, are predicted by 2-D 3-D finite-element analyses validated experimentally. Compared with a conventional machine, requires significantly smaller volume of material, since only half number magnets required, it exhibits higher torque density at...

A novel E-core hybrid-excited switched-flux permanent-magnet (SFPM) brushless machine is proposed based on an SFPM machine, which has significantly less magnet and higher torque density than those of a conventional machine. The simple structure. main flux path dc excitation does not affect the because it through magnets. combination stator rotor pole numbers optimized, flux-enhancing flux-weakening capabilities are investigated by 2-D finite-element analyses experimentally validated.

A winding copper loss can be significantly increased due to skin and proximity eddy-current effects. The losses fundamental frequency current have been investigated in literature, but the influence of pulsewidth modulation (PWM) on has not reported. In this paper, a 2-D finite element method is employed analyze permanent magnet brushless ac machine, which significant exists high ripples induced by PWM, as confirmed both theoretical calculation experiment. analyses should generally applicable...

A novel E-core switched-flux permanent-magnet (SFPM) brushless machine is proposed, and its electromagnetic performance compared with that of the conventional SFPM machine. The operation principle will be first described, influence stator rotor pole number combinations investigated, while optimized predicted by finite-element analyses validated experiment. It shown volume magnets in significantly reduced, only half machine, phase back electromotive force torque are ~15% larger than those

The significant influence of slot opening on the optimal stator and rotor pole combination electromagnetic performance switched-flux permanent magnet (SFPM) machine is observed investigated in this paper. A new SFPM brushless with remarkable relative to thickness developed reduce usage increase area. Its almost several times that conventional machine, but its only half. However, exhibits ~ 40% larger back EMF torque than those while cogging ripple are significantly lower.

This paper proposes a novel variable flux memory (VFM) machine, in which the "constant" permanent magnet (CPM) with high coercive force and "variable" PM (VPM) low are alternatively located interior-PM rotor. Thus, VPMs CPMs magnetically connected series, can assist to withstand unintentional demagnetization caused by armature reaction. Therefore, current be applied machine. Meanwhile, reluctance torque is retrieved. density obtained. Based on two-dimensional finite element analysis, first,...

A new brushless doubly-salient permanent-magnet machine called the flux-reversal is described. Design, analysis, construction and experimental results for a prototype built as single-phase, high-speed generator are presented. Qualitative comparisons made with other types of machines in its class, using flux-MMF diagram technique. An elementary CAD program developed designing associated drive electronics also

A low cost 3-phase DC winding excited flux-switching (FS) brushless AC machine is developed from the FS permanent magnet (FSPM) machine. The influence of stator and rotor pole number combination on its electromagnetic performance, including flux-linkage back-emf waveforms, static torque, torque-current density characteristics, are predicted by 2-D finite element analyses validated experiment. In addition, torque capability FSPM machines with rare earth ferrite magnets, respectively, compared...

Variable flux memory (VFM) permanent magnet (PM) machines exhibit an additional degree of freedom for control, i.e., PM magnetization state, and thus excellent controllability. Moreover, the hybrid topologies having variable (VPM) with low coercive force constant (CPM) high at same time are employed to improve torque density The parallel series connections between two different kinds PMs both feasible. Based on equivalent magnetic circuits, two-dimensional finite element analyses...

An improved approach to predicting cogging torque in permanent magnet motors using the flux-MMF diagram technique is presented and validated. A brief review of calculation minimization techniques included. It shown that can be constructed for any one pole a machine demagnetization characteristic magnet; then by applying principle virtual work, predicted. also truly universal prediction gives greater insight into many methods used minimization.

A novel E-core flux-switching PM (FSPM) brushless machine is proposed, and its electromagnetic performance compared with that of the conventional FSPM machine. The operation principle will be firstly described influence stator rotor pole number combinations investigated, while optimized predicted by finite element analyses validated experiment. It shown volume magnets in significantly reduced - only half machine, phase back-emf torque are ~15% larger than those

A series hybrid variable flux memory (VFM) machine employing two kinds of permanent magnets (PMs) on alternate rotor poles is investigated. This VFM features controllable PM and thus good flux-weakening capability, as well improved torque density. However, it found that the unipolar end leakage occurs if PMs are not balanced. According to analyses connection between based fundamental magnetic circuit, mechanism unbalanced revealed. Further, rule obtaining balanced identified effects...

An improved approach to predicting cogging torque in permanent magnet motors using the flux-MMF diagram technique is presented and validated. A brief review of calculation minimization techniques included. It shown that can be constructed for any one pole a machine demagnetization characteristic magnet; then by applying principle virtual work, predicted. also truly universal prediction gives greater insight into many methods used minimization.

This paper uses the flux-MMF diagram to compare and contrast torque production mechanism in seven common types of electric motor. The is a generalized version flux-linkage versus current (/spl psi/-i) for switched-reluctance motors. It illustrated switched-reluctance, synchronous-reluctance, induction, brushless AC, DC, interior PM commutator calculated diagrams motors with same electromagnetic volume, airgap, slotfill, total copper loss are shown used low-speed ripple performance. motor...

The performance of the optimized conventional, novel E- and C-core flux-switching permanent magnet (FSPM) machines having different combination stator rotor pole numbers is compared by finite element analyses, with particular reference to conductor eddy current loss iron loss. Both increase number, while 11- 13-rotor machine always exhibit lower than those 10- 14-rotor machine, respectively. use half number volume magnets but higher efficiency conventional FSPM machine.

In this paper, a novel switched flux permanent-magnet (SFPM) memory machine, which consists of changeable magnetized permanent magnets (CMPMs) in the stator, is developed and investigated. By changing magnetization directions CMPMs, PM linkage can be either enhanced or weakened. When weakened at high speed, density lamination as well iron loss reduced. Thus, higher efficiency obtained. To evaluate improvement SFPM map calculated compared with that interior machine by taking Toyota/Prius 2010...

Memory motor has been researched extensively in the last decade due to its online magnetization capability. Among many types of designs, hybrid magnet memory (HMMM) highest torque density. This paper investigates cross coupling effect HMMM topology proposed by Sakai. The analysis model is introduced firstly. Based on magnetic circuit model, mechanism opencircuit investigated while ideal condition for eliminating this proposed. Later, on-load also analysed both and 2D FEA focusing coercive...

The electromagnetic performance of flux-switching and interior PM machines is comparatively studied in this paper. differences between these two types are highlighted their maximum torque flux-weakening capabilities compared analytically by the finite element method, with due account for different split ratios.

Tthe electromagnetic performance of switched reluctance machines (SRMs) with unipolar and bipolar excitations, either sinusoidal or rectangular current waveforms, is investigated in terms torque capability ripple, iron loss etc. By employing a cost effective standard 3-phase full bridge inverter, both excitations are implemented. Compared the ripple significantly reduced excitation, albeit capability. Experiments on prototype 6/4 SRM carried out to demonstrate advantages excitation.

The vibration and acoustic noise are investigated in a novel variable flux reluctance machine, which utilizes DC-field coil the stator to achieve on-line adjustment of air-gap density. capability adjusting density is expected improve efficiency extend speed range. doubly salient structure switched machines (SRM) employed together with non-overlapping concentrated windings reduce copper loss. 2D 3D-finite element analyses predict radial force modes respectively. With aid vector control,...

In flux-switching permanent magnet machines, a significant leakage flux exists at the outer surface of stator core. Since varies as rotor rotates, eddy current loss may be induced in nonmagnetic frame. The and associated representative machine are investigated by finite element analysis, on both open-circuit rated load, predicted results being validated experimentally. addition, effectiveness introducing slots frame to reduce is

The iron loss in flux-switching permanent magnet (FSPM) machine is investigated by the finite element method this paper. Since magnets a FSPM are on stator, rather than rotor as conventional PM machines, exists not only stator but also rotor, while its calculation becomes more difficult due to complex flux density waveforms. A accurate model for proposed machine, with consideration of influence operation conditions, including constant torque and flux-weakening. Finite predicted open-circuit...

A novel switched flux permanent magnet machine (SFPMM) with both normal NdFeB and low coercive force (LCF) magnets has been developed in this paper. Outside a conventional SFPMM, the LCF are mounted on back of every U‐shaped stator lamination segment parallel magnetisation direction alternative polarities. ring yoke is placed around all magnets, while extra coils wound each them. By injecting different directions current pulses into coils, polarities can be rewritten order to enhance or...