In recent years, permanent magnet vernier (PMV) machines are attracting more and attentions owing to their high torque density feature, which is mainly benefited from its special operation principle called flux modulation effect. Nevertheless, It found that working low, viz., ~0.3T for modulated in the surface mounted PMV machines. Hence, there a really large space further improve of machine. The spoke array widely used regular PM machine density. However, barrier effect has been proved,...

Flux reversal permanent magnet (FRPM) machine, with magnets mounted on or inserted into the stator, is favorable for direct drive applications. In this paper, an FRPM machine Quasi-Halbach array in stator slot opening introduced. The operation principle of proposed presented, and combination rotor number given. Several key parameters, that are split ratio, thickness carefully investigated, while four machines 12 slots 10, 11, 13, 14 optimized better performance. Moreover, compared a...

This paper proposes an alternate sub-hexagonal center dual-inverter PWM scheme for open-end winding DC-biased vernier reluctance machine (DC-biased-VRM) drive using novel adjustable zero voltage vector to reduce inverter loss. The is utilized assure the regulation of AC voltage, a strategy proposed reconfigure zero-sequence and realize real-time adjustment current. In addition, dead zone distortion analyzed, dead-time effect compensation investigated on basis suppress distortion....

Stator permanent magnet (PM) machines are gaining more research interest in recent decades. Since the magnets (PMs) moved from rotor side to stator and salient structure is adopted, it claimed that exhibit several promising features, such as simple robust rotor, good ability of heat dissipation main losses located stator. On other hand, improve shortcomings inherent limited magnetic field adjustment ability, low efficiency power factor dc current excited machines, hybrid excitation PM with...

This paper proposes a fault-tolerant control strategy of the open-winding inverter for dc-biased vernier reluctance machines (dc-biased VRMs), aiming to maintain output capability after open-circuit fault occurs in switches. DC-biased VRMs are with integrated winding current both dc component field excitation and ac torque generation. The generation is not associated direction, making full-bridge be divided into two groups devices. proposed based on regular each open can motor mode one group...

This article proposes an accurate harmonic current suppression strategy for direct (dc)-biased VRMs based on adaptive notch filter (ANF) to reduce torque ripple and power loss. A new reference frame is proposed in <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">dq</i> -axis combined with ANF, thus currents are accurately extracted analyzed. Furthermore, a phase-shift dc-biased VRMs, realizing precise compensation of voltages. The ANF-based...

An optimal three-dimensional current computation flux weakening control strategy for dc-biased Vernier reluctance machines (VRMs) is proposed in this paper. Compared with permanent magnet synchronous machines, VRMs have an additional degree of freedom to regulate the rotor through variable armature current. The conventional does not utilize adjustable dc field current, and output capacity region limited. In paper, distribution calculated at intersection voltage constraint. Meanwhile, order...

To improve the tracking accuracy and antidisturbance performance of permanent magnet linear synchronous motor (PMLSM), in this article, a fast recursive terminal sliding-mode control (FRTSMC) with mover velocity disturbance observer (MVDO) is proposed. The FRTSMC designed by structure sliding mode integral mode. initialized an appropriate value to reduce approach time guarantee that error converges zero finite time. further property suppress chattering phenomenon, MVDO integrated into...

This paper addresses the design and investigation of an improved torque density dc-biased Vernier reluctance machine (dc-biased-VRM), which is characterized by salient rotor structure, merely one set concentrated windings in stator. First, a 12-stator slot, 10-rotor slot dc-biased-VRM designed. Then analyzing magnetic flux distribution with finite-element analysis, it found that always doesn't flow across half stator teeth. Therefore, these teeth are removed novel 6/10 20% higher obtained....

The distorted back electromotive force (EMF) waveforms of dc-biased vernier reluctance machines result in stator current distortion, torque ripple, and efficiency reduction. For the purpose eliminating harmonic currents optimizing phase current, a new optimal control strategy is proposed by utilization accurate fundamental voltage equations. Each component decoupled multilevel synchronous rotating coordinate. interactions between multiple are avoided, it assures strong robustness. can be...

This article proposes a direct torque control (DTC) strategy for dc-biased vernier reluctance machines (dc-biased-VRMs) capable of zero-sequence current regulation. The phase waveform the dc-biased-VRM is sinusoidal with dc bias. To regulate bias current, proposed method reserves adjustment time in each switching period. Then, to achieve maximum per ampere condition, unique needs be distributed closely respect reference and flux. In addition, voltage distribution associated DTC further...

This paper presents a comparative study of harmonic current suppression control strategies for dc-biased vernier reluctance machines (dc-biased-VRMs). The back electromotive force waveforms dc-biased-VRMs contain low-order harmonics. It leads to currents in phase windings. To eliminate the currents, two types representative architectures, namely closed-loop with proportional integral and resonant regulators specific order harmonics compensation algorithm multilevel rotating reference frame,...

This paper investigates the two latest proposed drive system topologies for dc-biased vernier reluctance machines (VRMs), aims to find out preferable configuration, and explains performance discrepancy between configurations. Different from regular ac machines, armature winding current waveforms of VRMs are sinusoidal with dc bias. To provide flow path, associated machine, namely, an open converter single-layer concentrated a dual three-phase double-layer winding. The configurations...

This article proposes a dual-inverter pulsewidth modulation (PWM) scheme for dc-biased vernier reluctance machines (dc-biased-VRMs) with reduced switching frequency capable of zero-sequence current regulation. The dc-biased-VRM utilizes the additional dc bias in armature winding to construct rotor flux. To regulate current, two sets three-phase inverters common bus are used provide flow path. In each cycle, number actions is doubled compared conventional inverter. There still certain...

DC-excited vernier reluctance motors are usually fitted into two sets of stator windings: DC current winding for generating magnetic field and armature producing rotating flux. However, separated windings require larger motor size complex structure. Two power electronics converters required to drive both the excited rotational windings. This paper investigates DC-biased sinusoidal with single compared traditional Furthermore, structure inverter supplying currents component is proposed, due...

Deterministic optimization of permanent magnet synchronous linear motor (PMSLM) results in poor robustness thrust performance because it usually ignores manufacturing tolerances, assembly errors, and other uncertainties. Therefore, an method based on extremum robust domain characteristic (ERDC) is proposed to achieve PMSLM. First, the equivalent magnetization intensity PMSLM topology applied establish ripple analysis model. Second, a combination Tent chaotic sequences opposition-based...

To improve the bandwidth and thrust performance of permanent magnet synchronous linear motor (PMSLM), from perspective structure design, this article proposes a high-accuracy fast-calculation inductance model centralized winding based on analytic kernel-embedded elastic-net regression (AKER) to establish comprehensive analytical PMSLM performance. A stochastic fractal search (SFS) algorithm is introduced optimize performances PMSLM. First, Neumann's formula integral used equivalent (EIAM)...

Different from the regular ac machines, armature winding current waveforms of dc-biased vernier reluctance machines (DC-biased-VRMs) are sinusoidal with dc bias. The power factor (PF) calculation process also shows great difference. This paper intends to analyze PF theoretically based on mathematical model. Then, investigate approach optimize and price pay if measures taken further improve PF. DC-biased-VRM is expressed under synchronous rotating frame. A maximum control strategy proposed by...

Recently, a novel hybrid excited vernier permanent magnet machine (HE-VPM) is proposed. The proposed with stator located PMs, and concentrated armature windings. current waveforms of the windings are sinusoidal DC bias, as injected biased can weaken or enhance exciting fields at high/low speed. Due to characteristics double salient structure, massive amount back-EMF harmonics in phase will appear when operating, flow path lead waveform distortion windings, result torque ripple influence...

In this article, a dual-stator permanent magnet (PM) arc motor (DS-PMAM) with improved torque density is investigated for some specific direct-drive applications. The proposed DS-PMAM can be considered as the combination of PM and stator-PM motor. Benefiting from two different stator structures, sets armature windings are employed to improve inner space utilization ratio densities. structure working principle first introduced. simplified analytical model derived provide solid theoretical...

The article presents a new dual-permanent magnet (DPM) excited permanent arc motor (DPMPMAM). proposed DPM-PMAM combines the advantages of rotor (RPM) (RPM-PMAM) and stator (SPM) (SPMPMAM). Firstly, topology operation principle are recommended. Then, design considerations combinations slot/rotor pole carried out, with purpose acquiring optimal performance DPM-PMAM, its critical structural parameters analyzed. On this basis, electromagnetic properties assessed compared another middle SPM...

A feedback linearization direct torque control (FL-DTC) scheme with the ability of regulating zero-sequence current is proposed for dc-biased vernier reluctance machines (DC-VRMs) to improve steady and dynamic performance drive system. First, an accurate original nonlinear model DC-VRM analyzed in synchronous rotating reference frame three variables (i.e., electromagnetic torque, stator flux, current). The saturation self-inductance considered ensure accuracy under different load. virtual...