The Experts below are selected from a list of 237 Experts worldwide ranked by ideXlab platform
Ming Cheng - One of the best experts on this subject based on the ideXlab platform.
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Comparison of modular linear flux-switching permanent magnet motors with different mover and stator Pole Pitch
2017 20th International Conference on Electrical Machines and Systems (ICEMS), 2017Co-Authors: Bangfu Zhang, Ming Cheng, Mingli Zhang, Wei Wang, Yunlei JiangAbstract:In this paper, a new modular linear flux-switching permanent magnet machine is presented. The operation principle is illustrated in detail. The electromagnetic performance analysis of the machine is carried out by the finite-element method. To investigate the influence of the mover Pole Pitch to stator Pole Pitch ratio on the new modular machine, the proposed machines with three different ratios are designed and optimized for the specific ropeless elevator application. The optimization methodology is based on sequential surrogate model. The electromagnetic characteristics of the three modular machines with different mover and stator Pole Pitches are compared.
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speed control of complementary and modular linear flux switching permanent magnet motor
IEEE Transactions on Industrial Electronics, 2015Co-Authors: Ming Cheng, Bangfu ZhangAbstract:To overcome the drawbacks of conventional linear flux-switching permanent-magnet (FSPM) motors split directly from the rotary FSPM motor, the topology, operation principle, and static thrust performances of a new series of complementary and modular linear FSPM (CMLFSPM) motors with different mover/stator Pole Pitch ratio have been investigated. However, the existing researches mainly focus on the principle and static performance of this MLFSPM motor. In this paper, the closed-loop speed control performance of this kind of motor based on primary flux-oriented control is investigated. First, the research status of linear FSPM motor is introduced. Second, the mathematical model in the $dq$ coordinate and the control scheme of a CMLFSPM motor are presented. Then, the proposed control strategies of the CMLFSPM motor are verified by using MATLAB/Simulink. Finally, the experiments on a prototype of the proposed motor are carried out to validate the study of closed-loop speed control.
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investigation and general design principle of a new series of complementary and modular linear fspm motors
IEEE Transactions on Industrial Electronics, 2013Co-Authors: Ming ChengAbstract:The conventional linear flux-switching permanent-magnet (FSPM) motors directly split from a rotary FSPM motor suffer from drawbacks such as unbalanced magnetic circuit of end coil, bigger cogging force, and force ripple. In this paper, to reduce cogging force and thrust force ripple, some complementary and modular linear FSPM (LFSPM) (MLFSPM) motors with mover/stator Pole Pitch ratio τm/τs of about one, namely, τm/τs = 10/12, 11/12, 12/12, 13/12, 14/12, 15/12, will be investigated using finite-element method (FEM) and experimental method at first. Then, another new LFSPM motor with τm/τs = 3 is analyzed. Based on τm/τs = 3, some new MLFSPM motors are designed, investigated, and compared using FEM. To fully investigate these motors, the optimal MLFSPM motor with τm/τs = 3 is quantitatively compared with the two optimal motors with τm/τs ≈ 1 . Finally, the general design principle for this series of MLFSPM motors with different τm/τs values is concluded.
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Comparison of complementary and modular linear flux-switching motors with different mover and stator Pole Pitch
IEEE Transactions on Magnetics, 2013Co-Authors: Ruiwu Cao, Chris Mi, Ming Cheng, Wei Hua, Wenxiang ZhaoAbstract:Linear flux-switching permanent magnet (LFSPM) motors with both permanent magnets and armature windings on the short primary mover have attracted considerable attention due to their simple and cheap stator which only consists of iron. Hence, this kind of liner motor is very suitable for long stator applications such as in urban rail transportations. However, the conventional LFSPM motors directly split from rotary FSPM motor suffer from drawbacks such as unbalanced magnetic circuit of end coil, heavy mover, and bigger cogging force and force ripple. Modular LFSPM (MLFSPM) motors can mitigate the problem of unbalanced magnetic circuit of end coil. But some MLFSPM motors with different stator/mover Pole Pitch τs/τm=12/14, 12/10 don't have complementary phase armature windings, which will lead to asymmetrical and non-sinusoidal back-electromotive force, bigger cogging force and thrust force ripple. The key of this paper is to propose, investigate, and compare four complementary and modular structures for the LFSPM motors with different τs/τm . The electromagnetic performance and dimensions of the proposed complementary MLFSPM motors with different τs/τm are investigated, compared and confirmed by the means of finite element analysis and experimental results. Based on the analysis results, two complementary MLFSPM motors with τs/τm=12/13 are chosen to be the two best motors, which can offer the biggest thrust force, relatively smaller cogging force and thrust force ripple, and shorter mover length.
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a linear doubly salient permanent magnet motor with modular and complementary structure
IEEE Transactions on Magnetics, 2011Co-Authors: Ruiwu Cao, Ming Cheng, Wei Hua, Wenxiang ZhaoAbstract:A linear doubly salient permanent magnet (LDSPM) motor is particularly suitable for long stator applications due to its simple and low cost stator, which consists of only iron. This paper proposes a new LDSPM motor design with complementary and modular structure. The key of this structure is that the primary mover is composed of two modules whose positions are mutually four and one half of the stator Pole Pitch apart and there is a flux barrier between them. Hence, the back electromotive force (EMF) waveform and cogging force of the two modules have 180 electrical degree differences. This design results in the total cogging force being significantly reduced and the back-EMF of each phase becoming symmetrical because the even harmonics are canceled. For fair comparison, an existing linear LDSPM motor is designed based on the same electromagnetic parameters and compared by the means of finite element analysis (FEA). The results reveal that the proposed LDSPM motor can offer symmetrical back-EMF waveforms, smaller cogging force, lower force ripple, and higher magnet utilization factor than the existing one.
Han-ping D. Shieh - One of the best experts on this subject based on the ideXlab platform.
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Optimal design of fine magnetic Pole Pitch fabricated on printed circuit board
Journal of Applied Physics, 2005Co-Authors: Kuo-chi Chiu, Der-ray Huang, Han-ping D. ShiehAbstract:Using traditional methods, a permanent magnet multiPole component magnetized with a magnetic Pole Pitch of less than 1mm is very difficult to achieve and a costly, complicated magnetization system is required. In this paper, the optimal design of a fine magnetic Pole Pitch of less than 1mm fabricated on a printed circuit board has been successfully investigated and demonstrated. An optimal magnetic Pole Pitch having large variation and strength in magnetic-flux density was obtained. The characteristics of the optimal magnetic Pole Pitch are good for signal detection and processing. The measured values of the magnetic-flux density in the z component are in agreement with the calculated values.
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Field improvement of fine magnetic Pole Pitch fabrication on printed circuit board using a dual layer structure
INTERMAG Asia 2005. Digests of the IEEE International Magnetics Conference 2005., 2005Co-Authors: Kuo-chi Chiu, Der-ray Huang, Han-ping D. ShiehAbstract:Fine magnetic Pole Pitch of less than 1 mm fabricated on printed circuit board with different magnetic Poles on single and dual layer structures were analyzed. The central consecutive magnetic Poles of magnetic flux density distributions were measured using a Hall probe. The measured values were found in agreement with the calculated values.
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Formulas for computing the magnetic flux density of fine magnetic Pole Pitch fabricated on printed circuit board
Journal of Magnetism and Magnetic Materials, 2005Co-Authors: Kuo-chi Chiu, Der-ray Huang, Han-ping D. ShiehAbstract:A special wire circuit with an appropriate layout was designed and formed on printed circuit board (PCB). After a current flowed through the wire circuit, the magnetic field was induced according to Ampere's law and a fine magnetic Pole Pitch of less than 1 mm was fabricated. Three-dimensional formulas are presented for computing the magnetic flux density of fine magnetic Pole Pitch fabricated on PCB. These formulas are expressed in terms of finite sums of elementary functions and enable rapid parametric studies of the magnetic flux density distribution relative to wire width, wire thickness, dimension of magnetic Pole Pitch, etc. They are easily programmed and have been successfully verified by experimental measurements.
Z Q Zhu - One of the best experts on this subject based on the ideXlab platform.
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investigation of scaling effect on power factor of permanent magnet vernier machines for wind power application
Iet Electric Power Applications, 2020Co-Authors: Dileep Kumar Kana Padinharu, Z Q Zhu, Richard Clark, Ziad Azar, Arwyn ThomasAbstract:This study investigates the scaling effect on power factor of surface mounted permanent magnet Vernier (SPM-V) machines with power ratings ranging from 3 kW, 500 kW, 3 MW to 10 MW. For each power rating, different slot/Pole number combinations have been considered to study the influence of key parameters including inter-Pole magnet leakage and stator slot leakage on power factor. A detailed analytical modelling, incorporating these key parameters, is presented and validated with two-dimensional finite-element analysis for different power ratings and slot/Pole number combinations. The study has revealed that with scaling (increasing power level), significant increase in electrical loading combined with the increased leakage fluxes, i.e. (i) magnet leakage flux due to large coil Pitch to rotor Pole Pitch ratio, (ii) magnet inter-Pole leakage flux and (iii) stator slot leakage flux, reduces the ratio of armature flux linkage to permanent magnet flux linkage and thereby has a detrimental effect on the power factor. Therefore, unlike conventional SPM machines, the power factor of SPM-V machines is found to be significantly reduced at high power ratings.
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simplified analytical model and investigation of open circuit ac winding loss of permanent magnet machines
IEEE Transactions on Industrial Electronics, 2014Co-Authors: Z Q ZhuAbstract:This paper presents a simplified analytical model based on one slot per Pole for predicting the open-circuit AC winding loss of surface-mounted permanent-magnet machines accounting for the influence of tooth-tips but neglecting the redistribution effect of eddy currents. The comparison between the analytical models and finite-element results shows that the simplified analytical model has similar accuracy as the analytical model accounting for all slots together. The influence of various design parameters, such as conductor layout, slot width, slot opening width, tooth-tip height, magnet Pole-arc to Pole-Pitch ratio, and gap between tooth-tips and conductors, on the open-circuit AC winding loss is investigated. It shows that the open-circuit AC winding loss gradually decreases with the number of radial conductor layers if the number of circumferential layers is larger than 1, although the radial segmentation is ineffective when there is no circumferential segmentation. The loss decreases greatly when the number of circumferential layers changes from 1 to 2, but reduces slowly when the conductors are further circumferentially segmented.
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influence of the rotor Pole number on optimal parameters in flux switching pm brushless ac machines by the lumped parameter magnetic circuit model
IEEE Transactions on Industry Applications, 2010Co-Authors: J T Chen, Z Q ZhuAbstract:The investigation on flux-switching permanent-magnet (FSPM) machines in existing papers has been restricted to a specific combination of stator and rotor Pole numbers, viz., 12/10 stator/rotor Poles. In this paper, the influence of stator and rotor Pole numbers on the optimal parameters of the FSPM machines are investigated by the finite-element analysis and the lumped-parameter magnetic circuit model, respectively. It shows that, although the optimal rotor Pole width for maximum torque varies with the rotor Pole number, the optimized ratio of rotor Pole width to the rotor Pole Pitch almost maintains constant, viz., ~1/3. It also shows that the 12/13 and 12/14 stator/rotor Pole FSPM machines exhibit ~10% larger electromagnetic torque than the conventional 12/10 stator/rotor Pole FSPM machine. The analyses are validated by an experiment made on a 12/14 stator/rotor Pole FSPM machine.
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influence of rotor Pole number on optimal parameters in flux switching pm brushless ac machines by lumped parameter magnetic circuit model
International Electric Machines and Drives Conference, 2009Co-Authors: J T Chen, Z Q ZhuAbstract:The investigation on flux-switching permanent magnet (FSPM) machines in existing papers has been restricted to specific combination of stator and rotor Pole numbers, viz. 12/10 stator/rotor Poles. In this paper, the influence of stator and rotor Pole numbers on the optimal parameters of the FSPM machines are investigated by the finite element analysis and the lumped parameter magnetic circuit model, respectively. It shows that although the optimal rotor Pole width for maximum torque varies with the rotor Pole number, the optimized ratio of rotor Pole width to the rotor Pole-Pitch almost maintains constant, viz. ∼1/3. It also shows that the 12/13 and 12/14 stator/rotor Pole FSPM machines exhibit ∼10% larger electromagnetic torque than the conventional 12/10 stator/rotor Pole FSPM machine. The analyses are validated by experiment made on 12/14 stator/rotor Pole FSPM machine.
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analytical methods for minimizing cogging torque in permanent magnet machines
IEEE Transactions on Magnetics, 2009Co-Authors: Li Zhu, S Z Jiang, Z Q Zhu, C C ChanAbstract:Cogging torque in permanent-magnet machines causes torque and speed ripples, as well as acoustic noise and vibration, especially in low speed and direct drive applications. In this paper, a general analytical expression for cogging torque is derived by the energy method and the Fourier series analysis, based on the air gap permeance and the flux density distribution in an equivalent slotless machine. The optimal design parameters, such as slot number and Pole number combination, skewing, Pole-arc to Pole-Pitch ratio, and slot opening, are derived analytically to minimize the cogging torque. Finally, the finite-element analysis is adopted to verify the correctness of analytical methods.
Kuo-chi Chiu - One of the best experts on this subject based on the ideXlab platform.
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field analysis and enhancement of multi Pole magnetic components fabricated on printed circuit board
Journal of Magnetism and Magnetic Materials, 2007Co-Authors: Kuo-chi Chiu, Chinse CheAbstract:Abstract A multi-Pole magnetic component magnetized with a fine magnetic Pole Pitch of less than 1 mm is very difficult to achieve by using traditional methods. Moreover, it requires a precise mechanical process and a complicated magnetization system. Different fine magnetic Pole Pitches of 300, 350 and 400 μm have been accomplished on 9-Pole magnetic components through the printed circuit board (PCB) manufacturing technology. Additionally, another fine magnetic Pole Pitch of 500 μm was also fabricated on a dual-layered (DL) wire circuit structure to investigate the field enhancement. After measurements, a gain factor of 1.37 was obtained in the field strength. The field variations among different magnetic Pole Pitches were analyzed in this paper.
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Optimal design of fine magnetic Pole Pitch fabricated on printed circuit board
Journal of Applied Physics, 2005Co-Authors: Kuo-chi Chiu, Der-ray Huang, Han-ping D. ShiehAbstract:Using traditional methods, a permanent magnet multiPole component magnetized with a magnetic Pole Pitch of less than 1mm is very difficult to achieve and a costly, complicated magnetization system is required. In this paper, the optimal design of a fine magnetic Pole Pitch of less than 1mm fabricated on a printed circuit board has been successfully investigated and demonstrated. An optimal magnetic Pole Pitch having large variation and strength in magnetic-flux density was obtained. The characteristics of the optimal magnetic Pole Pitch are good for signal detection and processing. The measured values of the magnetic-flux density in the z component are in agreement with the calculated values.
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Field improvement of fine magnetic Pole Pitch fabrication on printed circuit board using a dual layer structure
INTERMAG Asia 2005. Digests of the IEEE International Magnetics Conference 2005., 2005Co-Authors: Kuo-chi Chiu, Der-ray Huang, Han-ping D. ShiehAbstract:Fine magnetic Pole Pitch of less than 1 mm fabricated on printed circuit board with different magnetic Poles on single and dual layer structures were analyzed. The central consecutive magnetic Poles of magnetic flux density distributions were measured using a Hall probe. The measured values were found in agreement with the calculated values.
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Formulas for computing the magnetic flux density of fine magnetic Pole Pitch fabricated on printed circuit board
Journal of Magnetism and Magnetic Materials, 2005Co-Authors: Kuo-chi Chiu, Der-ray Huang, Han-ping D. ShiehAbstract:A special wire circuit with an appropriate layout was designed and formed on printed circuit board (PCB). After a current flowed through the wire circuit, the magnetic field was induced according to Ampere's law and a fine magnetic Pole Pitch of less than 1 mm was fabricated. Three-dimensional formulas are presented for computing the magnetic flux density of fine magnetic Pole Pitch fabricated on PCB. These formulas are expressed in terms of finite sums of elementary functions and enable rapid parametric studies of the magnetic flux density distribution relative to wire width, wire thickness, dimension of magnetic Pole Pitch, etc. They are easily programmed and have been successfully verified by experimental measurements.
Bangfu Zhang - One of the best experts on this subject based on the ideXlab platform.
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Comparison of modular linear flux-switching permanent magnet motors with different mover and stator Pole Pitch
2017 20th International Conference on Electrical Machines and Systems (ICEMS), 2017Co-Authors: Bangfu Zhang, Ming Cheng, Mingli Zhang, Wei Wang, Yunlei JiangAbstract:In this paper, a new modular linear flux-switching permanent magnet machine is presented. The operation principle is illustrated in detail. The electromagnetic performance analysis of the machine is carried out by the finite-element method. To investigate the influence of the mover Pole Pitch to stator Pole Pitch ratio on the new modular machine, the proposed machines with three different ratios are designed and optimized for the specific ropeless elevator application. The optimization methodology is based on sequential surrogate model. The electromagnetic characteristics of the three modular machines with different mover and stator Pole Pitches are compared.
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speed control of complementary and modular linear flux switching permanent magnet motor
IEEE Transactions on Industrial Electronics, 2015Co-Authors: Ming Cheng, Bangfu ZhangAbstract:To overcome the drawbacks of conventional linear flux-switching permanent-magnet (FSPM) motors split directly from the rotary FSPM motor, the topology, operation principle, and static thrust performances of a new series of complementary and modular linear FSPM (CMLFSPM) motors with different mover/stator Pole Pitch ratio have been investigated. However, the existing researches mainly focus on the principle and static performance of this MLFSPM motor. In this paper, the closed-loop speed control performance of this kind of motor based on primary flux-oriented control is investigated. First, the research status of linear FSPM motor is introduced. Second, the mathematical model in the $dq$ coordinate and the control scheme of a CMLFSPM motor are presented. Then, the proposed control strategies of the CMLFSPM motor are verified by using MATLAB/Simulink. Finally, the experiments on a prototype of the proposed motor are carried out to validate the study of closed-loop speed control.