Design and analysis of semi-closed stator core transverse flux permanent magnet generator

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Ali Muhammad ◽  
Faisal Khan ◽  
Muhammad Yousuf ◽  
Basharat Ullah
Keyword(s):  
Permanent Magnet ◽  
Power Density ◽  
Output Power ◽  
Structural Difference ◽  
Scale Production ◽  
Induced Voltage ◽  
Flux Linkage ◽  
Stator Core ◽  
Content Type ◽  
Transverse Flux

Purpose The purpose of this paper is to modernize the generator system of wind turbine concept that not only improves the efficiency and power density but also reduces the system cost making design simpler and less expensive, especially in large-scale production. Design/methodology/approach This paper presents a new permanent magnet transverse flux generator (PMTFG) for wind energy production. The key feature of its composition is the double armature coil in a semi-closed stator core. The main structural difference of the presented design is the use of double coil in the same space of semi-closed stator core and reduced number of stator pole pairs and rotor magnets from 12/24 to 10/20. 3D simulations are performed using finite element analysis (FEA) to measure induced voltage and magnetic field distribution at no load. The FEA is performed to quantify the change in flux linkage, induced voltage and output power as a function of different speeds and load current. Findings Results show that PMTFG with double coil configuration has improved electromagnetic performance in terms of flux linkage, induced voltage, output power and efficiency. The power density of 10/20 PMTFG with the double coil is 0.0524 KW/Kg, about an 18% increase compared to the conventional design. Research limitations/implications The proposed PMTFG is highly recommended for direct drive applications such as wind power. Originality/value Four models are simulated by FEA with single and double coil configuration, and load analysis is performed on all simulated models. Finally, results are compared with conventional PMTFG.

Analysis on the Optimal Geometrical Parameters of Topology Power Optimized Coil Based on a Cylindrical Magnet for Vibration-Based Electromagnetic Energy Harvester

2014 ◽  
Vol 903 ◽  
pp. 332-337
Author(s):  
Wan Hasbullah Mohd Isa ◽  
Ismayuzri Ishak
Keyword(s):  
Magnetic Flux ◽  
Permanent Magnet ◽  
Output Power ◽  
Energy Harvester ◽  
Copper Wire ◽  
Rate Of Change ◽  
Geometrical Parameters ◽  
Induced Voltage ◽  
Flux Linkage ◽  
The Given

This paper presents the analysis on geometrical parameters of the power-optimized coil based on Faradays principle by maximizing the coverage of magnetic flux linkage by the coil using a cylindrical permanent magnet of 6 mm diameter and 6 mm height. Faradays law states that induced voltage is the rate of change of flux linkage, meaning more winding induces more voltage. However it will increase also the resistance of the coil because the length of copper wire will also increase, which will reduce the generated power and power-density by the harvester according to Joules and Ohms laws. Simulation is used to virtually wind the inner and outer geometrical parameters of the coil using the given boundaries and the dimensions with highest output power are determined. The proposed form of the coil is cap-like shape which covers top half of the magnet where the amount of surrounding magnetic flux linkage is maximal. The result showed the induced power could be improved up to 60% using this method compared to usage of conventional ring-shaped coils.

scholarly journals PENGARUH JUMLAH LILITAN KUMPARAN STATOR TERHADAP KINERJA GENERATOR MAGNTE PERMANEN FLUKS AKSIAL SATU FASA

2020 ◽  
Vol 2 (2) ◽  
pp. 28-31
Author(s):  
Agus Nur Hidayat ◽  
Suyitno ◽  
Daryanto
Keyword(s):  
Permanent Magnet ◽  
Experimental Method ◽  
Output Power ◽  
Single Phase ◽  
Induced Voltage ◽  
Axial Flux ◽  
Incandescent Lamps ◽  
Coil Shape ◽  
Permanent Magnet Generator

The purpose of this research is to know to know the influence of stator coil shape to performance (induced voltage and output power) of single phase axial flux permanent magnet generator. The method used is an experimental method. The population in this study is a unit of single phase axial flux permanent magnet generator. The sample in this study is the stator coil. Experiments were carried out by testing the performance of a single-phase axial flux permanent magnet generator in each variation the number of coil windings which had the 90 turns, 120 turns, and 350 turns. Experiments were carried out with no -load testing and with a resitive load that used 30 Watt incandescent lamps. The conclusion of this study shows that there is an influence from the number of coil windings on the performance (induced voltage and output power) of the generator. From three variations of the stator coil that used as sample, the highest performance is shown by the single phase axial flux permanent magnet generator which used the highest number of coil stator turns. The more number of turns, the better the performance of a single-phase axial flux permanent magnet generator. Abstrak Tujuan dari penelitian ini adalah untuk mengetahui pengaruh jumlah lilitan kumparan stator terhadap kinerja generator fluks aksial satu fasa yang berupa tegangan induksi dan daya listrik yang dihasilkan. Metode yang digunakan adalah metode eksperimen. Populasi pada penelitian ini ialah satu unit generator magnet permanen fluks aksial satu fasa. Sampel pada penelitian ini ialah kumparan stator. Eksperimen dilakukan dengan menguji kinerja generator magnet permanen fluks aksial satu fasa pada setiap variasi jumlah lilitan kumparan stator 90 lilitan, 120 lilitan, dan 350 lilitan. Ekperimen dilakukan dengan pengujian tanpa beban dan dengan beban resitif berupa lampu pijar 30 Watt. Kesimpulan pada penelitian ini menunjukkan bahwa adanya pengaruh jumlah lilitan kumparan stator terhadap kinerja generator yang berupa tegangan induksi dan daya listrik keluaran. Dari ketiga variasi sampel kumparan stator, kinerja tertinggi ditunjukkan oleh generator magnet permanen fluks aksial satu fasa yang menggunakan jumlah lilitan kumparan stator terbanyak. Semakin banyak jumlah lilitan, semakin baik kinerja generator magnet permanen fluks aksial satu fasa.

scholarly journals Improvement of Tubular Permanent Magnet Machine Performance Using Dual-Segment Halbach Array

2018 ◽  
Author(s):  
Minh-Trung Duong ◽  
Yon-Do Chun
Keyword(s):  
Permanent Magnet ◽  
Flux Density ◽  
Output Power ◽  
Flux Linkage ◽  
Improve Performance ◽  
Machine Performance ◽  
Halbach Array ◽  
Proposed Model ◽  
Flux Leakage ◽  
Linear Machine

In this paper, modification of dual-Halbach permanent magnet (PM) array is investigated to improve performance of tubular linear machine, in terms of flux density and output power. Instead of a classical Halbach array with only radial and axial PMs, proposed model involves insertion of mig-magnets, which have magnetized angle shifted from the reference magnetized angles of axial and radial PMs. This structure leads to elimination of flux leakage and concentration of flux linkage in middle of the coil; therefore, the performance of machine is increased.

scholarly journals Analysis of the stator topology impact on cogging torque for surface permanent magnet motor

2015 ◽  
Vol 34 (2) ◽  
pp. 456-474 ◽  
Author(s):  
Lidija Petkovska ◽  
Goga Cvetkovski ◽  
Paul Lefley
Keyword(s):  
Permanent Magnet ◽  
Generic Model ◽  
The Novel ◽  
Permanent Magnet Motor ◽  
Stator Core ◽  
Cogging Torque ◽  
Content Type ◽  
Slot Opening ◽  
The Impact ◽  
Static Torque

Purpose – The purpose of this paper is to investigate the impact of the stator core design for a surface permanent magnet motor (SPMM) on the cogging torque profile. The objective is to show how the cogging torque of this type of motor can be significantly reduced by implementing an original compound technique by skewing stator slots and inserting wedges in the slot openings. Design/methodology/approach – At the beginning generic model of a SPMM is studied. By using FEA, for this idealised assembly, characteristics of cogging and electromagnetic torque are simulated and determined for one period of their change. Afterwards, actual stator design of the original SPMM is described. It is thoroughly investigated and the torque characteristics are compared with the generic ones. While the static torque is slightly decreased, the peak cogging torque is almost doubled and the curve exhibits an uneven profile. The first method for cogging torque reduction is skewing the stator stack. The second technique is to insert wedges of SMC in the slot openings. By using 2D and 2 1/2D numerical experiment cogging curves are calculated and compared. The best results are achieved by combining the two techniques. The comparative analyses of the motor models show the advantages of the proposed novel stator topology. Findings – It is presented how the peak cogging torque can be substantially decreased due to changes in the stator topology. The constraint is to keep the same stator lamination. By skewing stator stack for one slot pitch 10° the peak cogging torque is threefold reduced. The SMC wedges in slot opening decrease the peak cogging almost four times. The novel stator topology, a combination of the former ones, leads to peak cogging of respectable 0.182 Nm, which is reduced for 7.45 times. Originality/value – The paper presents an original compound technique for cogging torque reduction, by combining the stator stack skewing and inserting SMC wedges in the slot openings.

Control strategies for variable-speed permanent magnet synchronous generator systems

2015 ◽  
Vol 34 (6) ◽  
pp. 1845-1862
Author(s):  
Jian-Xin Shen ◽  
Dong-Min Miao ◽  
Mengjia Jin
Keyword(s):  
Permanent Magnet ◽  
Control Strategies ◽  
Synchronous Generator ◽  
Control Methods ◽  
Flux Linkage ◽  
Permanent Magnet Synchronous Generator ◽  
Content Type ◽  
Operation Speed ◽  
Voltage Vector ◽  
Stator Flux

Purpose – The purpose of this paper is to focus on various control strategies for permanent magnet synchronous generator (PMSG) systems, in order to stabilize the dc link output voltage over a wide operation speed range. Design/methodology/approach – Two control methods, namely, the flux regulation control (FRC) which adjusts the stator flux linkage and then indirectly stabilize the dc link voltage, and the direct voltage control (DVC) which directly stabilize the dc link voltage by regulating the power angle, are proposed in this paper. Both methods can be realized by either approach of the conventional space vector pulse width modulation (SVPWM) or the proposed single voltage vector modulation (SVVM). Findings – The FRC can optimize the field in the PMSG, however, the realization is complicated. The DVC need not estimate and regulate the stator flux linkage, hence is easy to implement. On the other hand, the SVPWM can provide smooth armature current and dc link voltage, while the SVVM applies only one voltage vector during each control cycle, hence, is simple to realize and requires the minimum switching on the PWM rectifier. All cross-combinations between the two control methods and the two realization approaches work well. Originality/value – The proposed FRC and DVC methods are simpler than the conventional field oriented control, while the proposed SVVM is a novel and efficient approach to generate the PWM status. Optimal cross-combination, either of SVPWM-FRC, SVVM-FRC, SVPWM-DVC and SVVM-DVC, can be chosen to satisfy the system characters and requirements.

Preliminary studies of 12S-8P and 12S-14P Hybrid-Excited Flux Switching Machine with FEC in radial direction by using JMAG-designer software

2018 ◽  
Vol 7 (4.30) ◽  
pp. 479
Author(s):  
S. Khalidah Rahimi ◽  
Md. Zarafi Ahmad ◽  
Erwan Sulaiman ◽  
Syed M. Naufal Syed Othman ◽  
Hassan Ali Soomro
Keyword(s):  
Permanent Magnet ◽  
Radial Direction ◽  
High Efficiency ◽  
Synchronous Machines ◽  
Induced Voltage ◽  
Flux Linkage ◽  
Element Analysis ◽  
Excitation Coil ◽  
Field Excitation ◽  
Maximum Field

In this paper, design analysis of Hybrid- Excited Flux Switching Machine (H-EFSM) with 12Slot-8Pole (12S-8P) and 12Slot-14Pole (12S-14P) topologies are presented. H-EFSM  has  been introduced in which  the advantage  of  Permanent  Magnet  (PM)  machines  and  DC  Field Excitation Coil (FEC) synchronous machines is combined. H-EFSM  design proposed less permanent magnet consumption, high to torque/power density and high efficiency. In recent, most of H-EFSM having FEC arranged  in  theta  direction  that affect in flux production which cause less flux generation and machines performances.  Therefore, a design of 12S-8P and 12S-14P H-EFSM with FEC arranged in radial direction is proposed to prevent flux cancellation and produce high flux linkage. Performance analysis of 12S-8P and 12S-14 H-EFSM such as PM flux, induced voltage, cogging torque and flux distribution are investigated by 2-D Finite Element Analysis (2D-FEA). A design with 12S-14P configuration has achieved the higher torque and power with 220.15Nm and  92.45kW, respectively at maximum field and armature current density

scholarly journals Improvement of Tubular Permanent Magnet Machine Performance Using Dual-Segment Halbach Array

Energies ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 3132 ◽  
Author(s):  
Minh-Trung Duong ◽  
Yon-Do Chun ◽  
Deok-Je Bang
Keyword(s):  
Permanent Magnet ◽  
Flux Density ◽  
Output Power ◽  
Flux Linkage ◽  
Permanent Magnet Machine ◽  
Machine Performance ◽  
Halbach Array ◽  
Proposed Model ◽  
Flux Leakage ◽  
Linear Machine

In this paper, a modification of the dual-segment permanent magnet (PM) Halbach array is investigated to improve the performance of the tubular linear machine, in terms of flux density and output power. Instead of a classical Halbach array with only radial and axial PMs, the proposed model involves the insertion of mig-magnets, which have a magnetized angle shifted from the reference magnetized angles of axial and radial PMs. This structure leads to the elimination of flux leakage and the concentration of flux linkage in middle of the coil; therefore, the output power is increased by 13.2%.

Analysis and design of a high power density permanent magnet-assisted synchronous reluctance machine with low-cost ferrite magnets for EVs/HEVs

2016 ◽  
Vol 35 (6) ◽  
pp. 1949-1964 ◽  
Author(s):  
Xiping Liu ◽  
Ya Li ◽  
Zhangqi Liu ◽  
Tao Ling ◽  
Zhenhua Luo
Keyword(s):  
Rare Earth ◽  
Permanent Magnet ◽  
Power Density ◽  
High Power ◽  
Low Cost ◽  
High Power Density ◽  
Content Type ◽  
Synchronous Reluctance Machine ◽  
Reluctance Machine ◽  
Rotor Structure

Purpose The purpose of this paper is to propose a permanent magnet-assisted synchronous reluctance machine (PMASynRM) using ferrite magnets with the same power density as rare-earth PM synchronous motors used in Toyota Prius 2010. Design/methodology/approach A novel rotor structure with rectangular PMs is discussed with respect to the demagnetization of ferrite magnets and mechanical strength. Some electromagnetic characteristics including torque, output power, loss and efficiency are calculated by 2D finite element analysis. Findings The results of the analysis show that a high power density and high efficiency for PMASynRM can be achieved using ferrite magnets. Originality/value This paper proposes a novel rotor structure of PMASynRM with low-cost ferrite magnets that achieves high power density as permanent machines with rare-earth PMs.

Design and analysis of tubular permanent magnetic linear generator with 120° phase belt toroidal windings

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Jikai Si ◽  
Zuoguang Yan ◽  
Rui Nie ◽  
Shuai Xu ◽  
Chun Gan ◽  
...  
Keyword(s):  
Flux Density ◽  
Power Density ◽  
Magnetic Flux Density ◽  
Finite Element Models ◽  
Wave Energy Conversion ◽  
Flux Linkage ◽  
Generation Efficiency ◽  
Content Type ◽  
Higher Power ◽  
Electromagnetic Characteristics

Purpose To improve the power density and generation efficiency of the tubular permanent magnetic linear generators (TPMLGs) under realistic sea-stator condition, a TPMLG with 120° phase belt toroidal windings (120°-TPMLG) for wave energy conversion is proposed in this paper. Design/methodology/approach First, the structure of the 120°-TPMLG is introduced and its operation principle is analyzed. Second, the design process of the 120°-TPMLG is described. Meanwhile, the finite-element models of the 120°-TPMLG and the TPMLG with traditional fractional pitch windings (T-TPMLG) are established based on the similar overall dimensions. Then, the electromagnetic characteristics of the 120°-TPMLG are analyzed, such as air gap flux density, back electromotive force and load voltage. Finally, a comparative analysis of the magnetic flux density, flux linkage, load and no-load performance of the two generators are conducted. Findings The result shows that the 120°-TPMLG has higher power density and generation efficiency than the T-TPMLG. Originality/value This paper proposes a TPMLG with 120° phase belt toroidal windings (120°-TPMLG) to improve the power density and generation efficiency.

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