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This paper presents a multi-physics finite-element-analysis (FEA) model that is used to study the impacts of a new nano-structured stator winding insulation material in large propulsion electric machines. Electromagnetic and thermal simulations are performed in ANSYS Maxwell and Steady-state Thermal respectively, and then linked in ANSYS Workbench interface. Detailed construction of the multi-physics...
Flux-switching permanent magnet machines (FSPMMs) have been investigated for hybrid electric vehicles (HEVs). This paper presents an optimal FSPMM with 12 stator poles to meet the minimal performance specifications required by the drive machine in the 2010 Prius HEV. After a qualitative analysis based on size equation to briefly compare performances of FSPMMs with four rotor topology structures, a...
The integrated starter generator (ISG) is one of the key components of hybrid electric vehicles. However, with the significant difference in power range between the two operation modes of the starter and generator, it is difficult for the generator to exhibit excellent behaviors in both modes. To solve this problem, a dual air-gap permanent magnet ISG is investigated in this paper. Torque characteristics...
In this paper, comparisons between two permanent-magnet-free (PM-free) machines, namely a wound-field flux-switching machine (WFFSM) and a switched reluctance machine (SRM), covering skewed-rotor and straight-rotor structures are conducted. The topologies and operation principles of the WFFSM are illustrated firstly. Then, the effects of rotor skewing angle on static characteristics, e.g., open-circuit...
This paper presents a new speed control system for a flux-modulated permanent-magnet (FMPM) in-wheel motor. It is based on deadbeat-direct torque and flux control (DB-DTFC) to reduce the torque ripple and improve the steady performance compared with conventional SVPWM-DTC system. DB-DTFC calculates the control input of next control period so that a new stator current observer is proposed to predict...
Flux reversal permanent magnet (FRPM) machine, with magnets mounted on or inserted into the stator, is favorable for the direct drive applications. In this paper, a novel FRPM machine with Ralbach array magnets in stator slot opening is proposed. While the magnets are moved to the slot opening, effective airgap length is reduced and slot area is enlarged. The analysis results indicates that the torque...
This paper reviews recent trends in the application of flux switching machines (FSMs) in industry, the variation in FSM designs and control strategies to achieve enhanced performance. FSMs offer advantages such as high torque density, high speed capability, ease of control and low vibration and acoustic noise compared with competing technologies. These features enable FSMs to be applied in transportation,...
This paper proposes a novel variable reluctance hybrid magnet memory machine (VR-HMMM), which is geometrically characterized by doubly salient structure having homopolar hybrid magnets alternatively mounted on the stator poles. The magnetizing coils are wound on the PM excitation teeth to vary the magnetization states of low coercive force (LCF) magnets, and hence the air-gap flux can be flexibly...
Flux-switching permanent magnet machines (FSPM) show high-reliability and are quite suitable for the fields such as new energy, electric vehicle and aerospace. In this paper, the id=0 vector control strategy based on SVPWM was proposed. Besides, the high frequency signal injection method was used to identify the initial rotor position of FSPM. The experimental results proved the feasibility of the...
This paper presents a biased flux hybrid-excited flux switching (BFHEFS) machine to improve the flux adjustability. The proposed configuration adopts E-core to enhance the permanent magnet (PM) material utilization ratio, which use half PMs of the conventional flux switching PM (FSPM) machine. The flux-adjusted principle of the E-core BFHEFS machine is introduced to explain the better flux adjustability...
Synchronous reluctance machine (SynRM) has attracted much attention thanks to the advantages such as low cost, rugged rotor structure and high efficiency. Conventional drive for the SynRM is the same as that for permanent magnet synchronous machine (PMSM), i.e., the sine-wave drive. In this paper, square-wave drive is proposed for the SynRM. The torque performances with square-wave drive are analyzed...
In this paper rotor topologies of synchronous reluctance machines are compared with regard to electrical traction applications. Electrical machines for electric vehicles are usually operated in a wide speed range including flux weakening. In contrast to permanent magnet synchronous machines and induction machines synchronous reluctance machines have advantages of a very simple and cost effective rotor...
The cogging torque of variable flux reluctance machines (VFRMs) is usually large, which will result in undesired vibrations and acoustic noises. This paper introduces several methods to reduce the cogging torque of VFRMs including asymmetrical rotor teeth, circumferential rotor teeth pairing, rotor teeth shaping and rotor dummy slots. First, the cogging torque of VFRMs are analytically calculated,...
A novel 6/13-pole axial field flux-switching permanent magnet (AFFSPM) machine has the advantages of compact structure, large torque density, high efficiency and good fault tolerance. In order to reduce the influence of load mutation and the variation of system parameter on the control system of AFFSPM machine, and to improve the stability of drive system, the control method of AFFSPM machine is researched...
Permanent magnet synchronous machines (PMSMs) equipped with dual three-phase (DTP) fractional-slot overlapping windings (FSOWs) are characterized by stator modularization, low rotor losses and easy manufacturing. However, the overlapping between the adjacent phase windings may cause poor magnetic insulation in PMSMs, which is undesirable in fault-tolerant applications. This paper proposes a type of...
This article presents a method for control of a multiphase motor drive based on the use of a cognitive network that is capable of modelling nonlinearities of the system in fault conditions. To obtain a faithful model of the drive, a neural network (trained with the results of simulated faults) is used in the control algorithm in order to predict the system performance and adapt the control. A new...
In this paper, a novel stator structure with axially tapered stator tooth tip is proposed to mitigate cogging torque and reduce the machine back EMF harmonics. Furthermore, the stator tooth tips are specifically designed to provide balanced axial electromagnetic force. In order to realize continuous variation of stator tooth tip widths, the soft magnetic composite (SMC) material is used for the stator...
Additional loss is produced when the speed of the PMSM drive system is changed with the common id=0 control strategy. Hence, in this paper, a method based on the decoupling control strategy is proposed to reduce loss of permanent magnet synchronous machines (PMSMs) in dynamic state. The new decoupling control strategy could reduce the additional loss compared with the traditional method by holding...
High speed brushless permanent-magnet generators (HSBPMGs) may be the most suitable choice for small solar co-generation systems due to a variety of merits. For instance, they offer substantial reduction in size, and thermally excellent high-power density, which reduces the running costs with good performance and reliability. Moreover, high efficiencies i.e. over 90%, light-weight, low operating temperature,...
This paper compares the performance of Synchronous Reluctance Motors (SynRMs) using two different star-delta winding connections under normal operation. All the machine parameters are kept the same while the winding layout is only modified. The compared winding layouts differ in the combination between the number of coils of the star and delta winding sections. The two adopted windings are the only...
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