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A mathematical model to study changes in the energy parameters of a submersible electrical motor (SEM) through rotor pack parameters variations has been completed. Resistance variations influence coefficients of rotor pack short-circuited winding PEDN (SEMI)32–117 to power losses in the pack as well as efficiency and SEM air gap torque were determined in the Mathematica software. The worst-case energy...
Variable flux memory (VFM) permanent magnet (PM) machines exhibit an additional degree-of-freedom for control, i.e. PM magnetization state, and thus excellent flux controllability. Moreover, the hybrid PM topologies having variable PM (VPM) with low coercive force and constant PM (CPM) with high coercive force at the same time, are employed to improve the torque density and the flux controllability...
Axial flux permanent magnet (AFPM) synchronous motors are attractive for low speed direct drive systems because of their high specific torque. The present paper proposes a novel axial flux machine topology, called MAGNUS, obtained by combining a yokeless central stator type NS arrangement with two external high polarity spoke-rotors, resulting in very high flux concentration. The stator, which includes...
Nonintrusive efficiency evaluation method based on the air gap torque and rotor slot frequency is generally used in industry application. However, this method has the following problems: 1) the number of rotor slots should be given in advance; 2) with some special number of pole pairs and rotor slots, the stator and rotor slot harmonics may be aliasing, which may lead to great errors in identification...
As a promising candidate in direct drive application, Vernier permanent magnet synchronous machines (VPMSMs) feature high torque density due to magnetic gearing effect. This paper reveals the nature of magnetic gearing effect in VPMSMs in depth. Firstly, the general torque production mechanism of Vernier permanent magnet synchronous machines (VPMSMs) with surface mounted PMs are investigated based...
In this paper, reluctance synchronous machines are designed and optimised to operate in the 5 MW power range for the implementation as wind generators. It is shown, when assuming no rotor deformation, that reluctance synchronous generators can be comparatively designed to operate in this power range with power factors higher than 0.8 achieved. In order to further improve the machine performance, an...
Ultra-high speed switched reluctance machines (SRM) are becoming more and more promising due to its robustness and simple geometry. This paper proposed a detailed design procedure for an ultra-high speed SRM, including dimension calculation, material selection, winding selection, windage torque calculation, drive system and control strategy. The ultimate goal is to build a machine that is electromagnetically...
This paper investigates a novel two-converters based operation of a Brushless Doubly Fed Reluctance Machine (BDFRM). The BDFRM has a ducted rotor, and the stator is wound with two distributed windings which are fed from two separate power converters. Operation theory with frequency sharing between the two windings is introduced and corresponding FEA simulations are analyzed. The proposed BDFRM design...
This paper presents the design of an interior permanent magnet synchronous motor (IPMSM) with fractional-slot concentrated winding (FSCW). The study determines the number of poles and slots considering the winding factor and unbalanced magnetic force. Conventional calculation method is used to obtain the initial dimensions and finite element analysis (FEA) is adopted to acquire the performance of...
This paper explores some of the characteristics and limitations of the series configuration of hybrid excitation synchronous machine (HESM) compared to the wound field synchronous machine (WFSM). It also explores the influence of magnet excitation to field excitation ratio on their performances. The WFSM is a conventional salient pole synchronous motor, and the HESM consists of conventional salient...
This paper presents the design and optimization of a high-efficiency permanent magnet synchronous alternator with the desired output power of 2 kW at 6 krpm applying to the truck power system. This kind of alternator requires low output voltage and high current. In order to effectively increase the overload power handing capability and efficiency of the designed alternator, the low torque angle is...
Multiphase induction motor (MIM) drives are becoming popular for high-power applications because of fault tolerant capability and wide range speed-torque characteristics. Using pole-phase modulation (PPM) technique, it is able to give high-torque for faster acceleration as well as high speed during steady operation. To achieve both these features, the MIM drive requires higher number of stator slots...
Double Excited (or Hybrid Excited) Synchronous Motors (DESM or HESM) has gained great interest as they have the ability to control the air-gap field, and consequently the electrical drive speed due to the auxiliary excitation winding. To obtain the magnetic field distribution in the air gap many techniques are used. The Schwarz-Christoffel (SC) mapping allows the mapping of the slotted structure of...
A maglev wind yaw system (MWYS) is proposed to decrease the yaw power with the hybrid magnet. A disc motor and a variable speed gear are introduced to weaken the coupling between the suspension force and yaw torque. Firstly, we analyze the operation principal of the MWYS, and give the detailed description of the suspension weight and rotary torque. The rotor ample turns are given based on the Magnet...
This paper proposes a new topology for a single air gap spoke type vernier permanent magnet (SVPM) machine, that uses only ferrite permanent magnets (PMs), where alternating flux barriers are placed at the bottom of pair-wise magnets on the rotor. Overall, the alternating flux barrier topology reduces the manufacturing complexity, mechanical structural challenges and thermal issues, which are predominant...
We have previously proposed an integrated radial-axial flux rotor permanent magnet synchronous motor for EV traction motor, and confirmed that the motor had almost the same performance as an IPMSM, which uses sintered NdFeB magnet, based on a computer simulation. Our next target is general industrial-use motors, whose design policy is different from EV traction motors with a requisite forced cooling...
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, a proposed analytical model is introduced for acceptable optimization of an axial flux permanent magnet (AFPM) machines. Nowadays the finite-element model is one of the most powerful tool to analysis the electrical machine. However, sometimes this method can be very time-consuming for further optimization. Therefore, in this paper, a hybrid analytical model based on sub-domain algorithm...
This, paper proposes a dual-stator high temperature superconductor (HTS) reluctance-rotor brushless doubly-fed wind generator, which owns two stators and one salient reluctance rotor sandwiched between two stators. Two sets of windings with different pole-pairs locate on the two stators, separately, named as control winding and power winding. The modulation of reluctance rotor makes two sets of windings...
This paper presents a novel harmonic current injection method to optimize air-gap flux density distribution for multiphase induction machine. The control objective is to generate a nearly rectangular air-gap flux for better iron utilization. The proposed method uses air-gap field-oriented control and rotor field-oriented control to realize a real-time adjustment of the third harmonic current under...
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