To improve the performance of sensorless interior permanent magnet synchronous motor (IPMSM) drives, a quadrature phase-locked loop (PLL) with an adaptive notch filter (ANF) is proposed for model-based sliding-mode observer (SMO). The position estimation error sixth harmonic distortion caused by inverter nonlinearity and flux spatial harmonics analyzed. ANF based on noise canceling principle combined PLL to diminish error. This method can adaptively compensate in estimated electromotive...

Permanent-magnet vernier machine (PMVM) is a relatively new type of PM machines. An analytical subdomain model accounting for tooth-tips and flux modulation poles developed to accurately predict on-load field distributions in PMVMs. Based on two-dimensional (2-D) polar coordinate magnetic vector potential, this method solves the Maxwell's equations slot, air-gap, pole slot (FMPS), regions. Consequently, electromagnetic performance such as cogging torque, back-electromotive force (EMF), power...

Offline parameter identification of permanent magnet synchronous machines (PMSMs) is essential for proper tuning the controller and position observer general-purpose drives with sensorless control. This paper proposes a self-commissioning method electrical machine parameters at standstill only using voltage source inverter fed drive. The influence nonlinearities including effect parasitic capacitance, which may cause estimation error, analyzed. And an error model inductance considering...

For the purpose of improving performance sensorless interior permanent magnet synchronous motor (IPMSM) drives, an enhanced electromotive-force (EMF)-based position observer adopting second-order generalized integrator (SOGI) to eliminate harmonic error is proposed. The inverter nonlinearities and flux spatial harmonics that give rise estimation are analyzed. A decoupling network consisting multiple SOGIs based adaptive filters adopted achieve selective EMF elimination (MSEHE). application...

A partitioned stator hybrid excited machine is proposed, in which the permanent magnets and field windings are alternately placed on an inner separated from outer having armature windings. This inherits features of brushless machines benefits better space utilization. The operating principle effects slot/pole combinations investigated detail. Further, based 2-D finite-element analysis, electromagnetic performances proposed machines, including back-electromotive force, cogging torque, flux...

In this paper, the zero sequence circulating current in open winding permanent magnet synchronous machine (OW-PMSM) drives with common dc bus is systematically analyzed for first time. It revealed that affected by back-electromotive force, cross coupling voltages from side, pulse-width modulation induced voltage, and inverter nonlinearity side. Particularly, influences parasitic effect of are investigated time paper. Then, synthetic model equivalent circuit proposed as well. Each cause...

This paper comprehensively investigates the electromagnetic performance of 3-phase, 12-slot, and 8-pole switched reluctance machines (SRMs) with different winding configurations, i.e., double/single layer, short pitched (concentrated), fully (distributed). These SRMs are supplied by sinewave currents so that a conventional three-phase converter can be employed, leading to behavior which is akin synchronous reluctance-type machines. Comparisons in terms static dynamic performances such as d-...

This paper proposes a zero-sequence model-based sensorless control strategy for open-winding permanent-magnet synchronous machine (OW-PMSM) with common dc bus. The third harmonic back electromotive force (EMF) in is utilized to estimate the rotor position information. novelty that EMF reconstructed based on model together current, instead of using voltage transducer and three phase resistance network which can be eliminated from system. Due essence EMF, developed method appropriate...

Alternating-current motor drive systems consume the majority of global electricity, but most them are still not efficient enough. This paper proposes a complete solution to efficiency enhancement general induction (IM) with least cost and high reliability. On side, squirrel-cage rotors IMs replaced optimally designed interior permanent-magnet (PM) without damping windings; meanwhile, other assemblies remained unchanged. Stators both wye- delta-connected windings investigated, super premium...

This paper proposes a novel sensorless method for open-winding (OW)-permanent magnet synchronous machine (PMSM) (OW-PMSM) with circulating current suppression. First, zero-sequence steerable space vector pulse width modulation together controller (ZSC) is implemented to suppress the existing in OW-PMSM drive system common dc bus. Afterward, back EMF reconstructed from output signal of ZSC utilized extract position information via phase-locked loop-based observer. Hence, voltage transducer...

This paper develops a design methodology for switched flux (SF) hybrid permanent magnet memory machines (HPMMMs). The memorable is achieved due to the variable magnetization level of low coercive force (LCF) magnets (PMs) Thus, associated excitation loss negligible, resulting in high efficiency operation over wide speed range. A general PM magnetic circuit modeled, which characterized by spoke-array NdFeB PMs and LCF sandwiched between an outer stator ring inner pole. Based on circuit,...

This paper presents single-layer modular permanent-magnet machines with either wound or unwound teeth tooth tips. The structures having tips are suitable for slot number higher than pole to compensate the drop in winding factor due flux gaps alternate stator teeth, accordingly maintain even increase their average torques. However, lower and hence further improve machine performance. phase back-EMF, on-load torque, iron copper losses, as well efficiency have been calculated using FE analysis...

The memory machine concept is recently extended to switched-flux (SF) machines, forming a series of SF hybrid magnet machines (SF-HMMMs). They exhibit the merits good demagnetization withstand capability and effective flux adjustability. Nevertheless, torque density inevitably compromised due geometric conflict within stationary part. Meanwhile, inactivated dc coil, excluding online magnetization transients, results in system redundancy. Hence, this paper, new hybrid-excited (HE) developed...

This article investigates the nonlinear behavior of conventional voltage feedback flux-weakening control, i.e., magnitude control on nonsalient permanent magnet synchronous machine, and proposes an adaptive parameter tuning method for controller. Due to less margin in region, current dynamic performance is degraded. issue more serious when system operates overmodulation region could affect system's stability. Based designed controller, regions further improved by utilizing reference...

This paper first investigates the flux-weakening control performance of two types partitioned stator-switched flux permanent-magnet (PM) (PS-SFPM) machines and then proposes a novel mechanical technique. The PS-SFPM machine topologies, operation principles, method are described. In addition, it is shown that by mechanically varying relative position stators machine, PM linkage can also be varied, hence, provide improvement in speed range torque capability. optimal angle derived to enable...

This paper proposes a new partitioned stator flux reversal permanent magnet (PM) (PS-FRPM) machine having integer-slot overlapping windings, i.e., the slot number per pole phase q is an integer, based on magnetic gearing effect in stator-PM machines. Compared with existing PS-FRPM fractional-slot nonoverlapping more sinusoidal armature reaction magnetomotive force can be achieved proposed resulting lower iron loss and PM loss. Electromagnetic performance of machine, which has = 1 windings...

Zero-sequence current excited memory machine (ZSCE-MM) employs transient zero-sequence (ZSC) to change the magnetization state of low-coercive-force (LCF) magnet. Hence, torque density improvement and flexible flux regulation can be realized simultaneously without requiring additional magnetizing winding as well associate controller. However, this advantage ZSCE-MM cannot fully utilized through traditional virtual voltage vector based-space modulation (V <sup...

To improve the starting performance of a permanent-magnet traction machine without weight transducer in gearless elevator, an adaptive torque compensation strategy is proposed this paper. The dynamic model direct-drive elevator system considering rope elasticity, brake releasing, and friction established. Based on model, characteristics synthetic load exerted during start-up are obtained. In order to balance unknown for fuzzy self-tuning adopted generate suitable by tuning change rate...

In this paper, the partitioned stator flux reversal permanent magnet (PM) (PS-FRPM) machine and conventional magnetically geared (MG) operating in both stator-PM (SPM) rotor-PM (RPM) modes are comparatively analyzed terms of electromagnetic performance to provide design guides for an MG regarding SPM- or RPM-type a higher lower gear ratio machine. It is found that SPM-type recommended since PS-FRPM machines SPM have phase back-EMF hence torque than their RPM counterparts, respectively, as...

A novel type of partitioned stator switched flux permanent magnet (PS-SFPM) machine with either single-layer or double-layer windings is developed in this paper. The proposed PS-SFPM machines have two stators, which separately accommodate the armature and PMs, between rotor made iron pieces, while number poles PMs may be equal half that windings. All are optimized under fixed copper loss for maximum average torque by genetic algorithm. Their electromagnetic performances compared, such as...

Nuclear many-body calculations are computationally demanding. An estimate of their accuracy is often hampered by the limited amount computational resources even on present-day supercomputers. We provide an extrapolation method based perturbation theory, so that binding energy a large basis-space calculation can be estimated without diagonalizing Hamiltonian in this space. The tested for 3H and 6Li nuclei. It will extend our abilities significantly allow reliable error estimates.

To achieve flexible flux regulation, variable memory machines (VFMMs) are normally characterized by a high permanent magnet (PM) linkage design, which generally reduces the saliency ratio of machine. In order to further reveal internal performance tradeoffs, this paper investigates relationship between and PM linkages VFMMs combining equivalent magnetic circuit models finite element (FE) method. Three hybrid-magnetic-circuit (HMC) having different grades ratios chosen as case studies analyze...