scholarly journals Flux-Switching Permanent Magnet Machine with Phase-Group Concentrated-Coil Windings and Cogging Torque Reduction Technique

Energies ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2758 ◽  
Author(s):  
Jung-Woo Kwon ◽  
Jin-hee Lee ◽  
Wenliang Zhao ◽  
Byung-Il Kwon
Keyword(s):  
Permanent Magnet ◽  
Torque Ripple ◽  
Reduction Technique ◽  
Optimized Design ◽  
Kriging Method ◽  
Permanent Magnet Machine ◽  
Cogging Torque ◽  
Torque Density ◽  
Rotor Poles ◽  
Phase Group

We herein propose a novel high-torque-density flux-switching permanent magnet machine (FSPMM) which adopted phase-group concentrated-coil (PGCC) winding and a cogging torque reduction technique. The PGCC winding was applied to increase the torque density. In order to maximize the torque of the FSPMM that utilizes the PGCC windings, the performance according to stator slots/rotor poles combinations were compared. A machine which had 12 stator slots and 13 rotor poles (12S13P) was selected for its top average torque value. However, the 12S13P PGCC FSPMM contains high cogging torque that must be reduced. The cogging torque reduction technique is applied, and the parameters used in the technique are further optimized to achieve the target average torque, while suppressing the cogging torque as much as possible. The optimization process was performed with a collaboration of the genetic algorithm and Kriging method. The analysis results of the optimized design exhibited huge reductions in the cogging torque and eventually in the torque ripple from the initial machine, with reasonable average torque reduction. The entire work was evaluated experimentally using a manufactured prototype.

Study and design of dual stator permanent magnet machine with spoke-type configurations using phase-group concentrated-coil windings

2020 ◽  
Vol 64 (1-4) ◽  
pp. 1381-1389
Author(s):  
Dezhi Chen ◽  
Chengwu Diao ◽  
Zhiyu Feng ◽  
Shichong Zhang ◽  
Wenliang Zhao
Keyword(s):  
Permanent Magnet ◽  
Permanent Magnets ◽  
Low Cost ◽  
Dynamic Performance ◽  
Torque Ripple ◽  
Permanent Magnet Machine ◽  
Torque Density ◽  
Phase Group ◽  
High Torque ◽  
Simulation Results

In this paper, a novel dual-stator permanent magnet machine (DsPmSynM) with low cost and high torque density is designed. The winding part of the DsPmSynM adopts phase-group concentrated-coil windings, and the permanent magnets are arranged by spoke-type. Firstly, the winding structure reduces the amount of copper at the end of the winding. Secondly, the electromagnetic torque ripple of DsPmSynM is suppressed by reducing the cogging torque. Furthermore, the dynamic performance of DsPmSynM is studied. Finally, the experimental results are compared with the simulation results.

scholarly journals Effective Computational Techniques of Reducing Cogging Torque in Permanent Magnet Flux Switching Machine

2020 ◽  
pp. 19-25
Keyword(s):  
Permanent Magnet ◽  
Torque Ripple ◽  
Computational Techniques ◽  
Optimal Result ◽  
Flux Linkage ◽  
Suitable Candidate ◽  
Cogging Torque ◽  
Torque Density ◽  
Major Disadvantage ◽  
Electrical Vehicle

In this paper various techniques are applied to decrease cogging torque of overlap winding of permanent magnet flux switching machine (PMFSM) with 24-slot/16-pole. Due to its unique design PMFSM have mechanical strength, batter torque density and high flux linkage is a suitable candidate for electrical vehicle (EV). The major disadvantage of this design are high cogging torque and torque ripple while keeping constant average torque. Four various techniques are applied to minimalize the cogging torque of PMFSM to design it more suitable for PHEV applications. The legitimacy of these techniques has been observed by 3-D and 2-D simulations. Among all techniques the optimal result of Hybrid_C2 technique which reduces the cogging torque 66.28% with 0.7% loss in average torque.

Optimal design of a surface-mounted permanent magnet motor with multi-grade ferrite magnets to reduce torque pulsations

2020 ◽  
Vol 64 (1-4) ◽  
pp. 79-89
Author(s):  
Yan Liu ◽  
Wenliang Zhao ◽  
Xue Fan ◽  
Xiuhe Wang ◽  
Byung-il Kwon
Keyword(s):  
Optimal Design ◽  
Permanent Magnet ◽  
Torque Ripple ◽  
Kriging Method ◽  
Permanent Magnet Motor ◽  
Element Analysis ◽  
Cogging Torque ◽  
The Finite Element Analysis ◽  
Torque Pulsations ◽  
Flux Density Distribution

This paper proposes an optimal design for a surface-mounted permanent magnet motor (SPMM) to reduce torque pulsations, including cogging torque and torque ripple, by using multi-grade ferrite magnets. Based on a conventional SPMM with single-grade ferrite magnets, the proposed SPMM is designed with four-grade ferrite magnets and then optimized to minimize torque pulsations by maintaining the required torque, utilizing the Kriging method and a genetic algorithm. The results obtained by the finite element analysis show that the optimized SPMM with multi-grade ferrite magnets exhibits improved airgap flux density distribution with highly reduced cogging torque and torque ripple by maintaining the same average torque, as compared to the conventional SPMM. Furthermore, the analysis of the working points for the multi-grade ferrite magnets reveals that the optimized SPMM has good durability against the irreversible demagnetization.

scholarly journals Improving a Cogging Torque Reduction Technique for Fractional Slot Numbers in a Permanent Magnet Machine

2020 ◽  
Vol 55 (6) ◽  
Author(s):  
Tajuddin Nur ◽  
Marsul Siregar ◽  
O.B.W. Sandra ◽  
Karel O. Bachri
Keyword(s):  
Permanent Magnet ◽  
Air Gap ◽  
Reduction Technique ◽  
Permanent Magnet Machines ◽  
Permanent Magnet Machine ◽  
Cogging Torque ◽  
Slot Opening ◽  
Rotor Core ◽  
Simulation Results ◽  
Machine Structure

For this paper, an improvement to a cogging torque reduction technique was studied in regards to integral slot numbers in a permanent magnet machine. An 18 slot/8 pole permanent magnet machine structure was selected and developed, and some axial channels were introduced to the machine’s rotor core. The effects the axial channels had on cogging torque reduction were not studied in detail; however, it was noted that the channels did not disturb the machine’s normal magnetic flux in regards to an air gap. Two slotting steps were used on the edge of the machine’s permanent magnet with slot opening widths of 2 mm and air gap lengths of 1 mm; this was done in order to minimize cogging torque. Three different magnet structures for the permanent magnet machine were then analyzed and compared. The two steps for slotting were found to be best for cogging torque reduction among the three different structures. Finally, simulation results showed that improving slotting steps for magnet edges could significantly reduce cogging torque in permanent magnet machines by up to 98.80%.

scholarly journals Design and Analysis of a Dual Airgap Radial Flux Permanent Magnet Vernier Machine with Yokeless Rotor

Energies ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2311
Author(s):  
Mudassir Raza Siddiqi ◽  
Tanveer Yazdan ◽  
Jun-Hyuk Im ◽  
Muhammad Humza ◽  
Jin Hur
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Permanent Magnet ◽  
Flux Linkage ◽  
Element Analysis ◽  
Cogging Torque ◽  
Torque Density ◽  
Stator Windings ◽  
Radial Flux ◽  
Torque Ripples

This paper presents a novel topology of dual airgap radial flux permanent magnet vernier machine (PMVM) in order to obtain a higher torque per magnet volume and similar average torque compared to a conventional PMVM machine. The proposed machine contains two stators and a sandwiched yokeless rotor. The yokeless rotor helps to reduce the magnet volume by providing an effective flux linkage in the stator windings. This effective flux linkage improved the average torque of the proposed machine. The competitiveness of the proposed vernier machine was validated using 2D finite element analysis under the same machine volume as that of conventional vernier machine. Moreover, cogging torque, torque ripples, torque density, losses, and efficiency performances also favored the proposed topology.

scholarly journals Design and Analysis of a Novel Axial-Radial Flux Permanent Magnet Machine with Halbach-Array Permanent Magnets

Energies ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3639
Author(s):  
Rundong Huang ◽  
Chunhua Liu ◽  
Zaixin Song ◽  
Hang Zhao
Keyword(s):  
Permanent Magnet ◽  
Permanent Magnets ◽  
Torque Ripple ◽  
Axial Flux ◽  
Element Analysis ◽  
Torque Density ◽  
Axial Forces ◽  
Halbach Array ◽  
Radial Flux ◽  
High Torque

Electric machines with high torque density are needed in many applications, such as electric vehicles, electric robotics, electric ships, electric aircraft, etc. and they can avoid planetary gears thus reducing manufacturing costs. This paper presents a novel axial-radial flux permanent magnet (ARFPM) machine with high torque density. The proposed ARFPM machine integrates both axial-flux and radial-flux machine topologies in a compact space, which effectively improves the copper utilization of the machine. First, the radial rotor can balance the large axial forces on axial rotors and prevent them from deforming due to the forces. On the other hand, the machine adopts Halbach-array permanent magnets (PMs) on the rotors to suppress air-gap flux density harmonics. Also, the Halbach-array PMs can reduce the total attracted force on axial rotors. The operational principle of the ARFPM machine was investigated and analyzed. Then, 3D finite-element analysis (FEA) was conducted to show the merits of the ARFPM machine. Demonstration results with different parameters are compared to obtain an optimal structure. These indicated that the proposed ARFPM machine with Halbach-array PMs can achieve a more sinusoidal back electromotive force (EMF). In addition, a comparative analysis was conducted for the proposed ARFPM machine. The machine was compared with a conventional axial-flux permanent magnet (AFPM) machine and a radial-flux permanent magnet (RFPM) machine based on the same dimensions. This showed that the proposed ARFPM machine had the highest torque density and relatively small torque ripple.

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