Analytical Calculation of Back EMF Waveform for Linear PM Motors in Slotted and Slotless Structures

Min, Seun Guy; Sarlioglu, Bulent

doi:10.1109/tmag.2017.2743071

Cited by 42 publications

(18 citation statements)

References 20 publications

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“…Studies are conducted overlooking the distrbution factor in the axial direction or neglecting the gap between phase bands [14], [20], [21]. The calculations dedicated to linear coreless machines [22], [23] does not consider the variation of coil pitch to pole pitch ratio with respect to diameter which is the case for rotational AFPM coreless machines.…”

Section: Winding Factor Calculation For Air-gap Concentrated Winmentioning

confidence: 99%

Coreless and Conventional Axial Flux Permanent Magnet Motors for Solar Cars

Taran

Rallabandi

Heins³

et al. 2018

IEEE Trans. on Ind. Applicat.

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Axial flux permanent magnet (AFPM) motors are suitable options for solar powered vehicles due to their compact structure and high torque density. Furthermore, certain types of APFM machines may be configured without stator cores, which eliminates associated losses and cogging torque and simplifies the manufacturing and assembly. This paper examines two machine designs for use in the solar powered vehicle of the challenger class-a single rotor, single stator conventional AFPM machine, and a coreless AFPM machine with multiple stator and rotor disks. Response surface methodology (RSM) is utilized for the systematic comparison of the conventional and coreless topologies and to select the optimum designs among several hundreds of candidates. Designs with minimum losses and mass producing required torque with larger air-gap are favored. The performance of the selected designs have been studied via 3D finite element analysis (FEA). The FEA parametric modeling methodology is validated by measurements on three AFPM machines of the conventional and coreless type. Index Terms-Axial flux permanent magnet machines, coreless, multi-disk, solar powered electric vehicles, finite element analysis, winding factor, response surface methodology, design of experiments.

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Section: Winding Factor Calculation For Air-gap Concentrated Winmentioning

confidence: 99%

Coreless and Conventional Axial Flux Permanent Magnet Motors for Solar Cars

Taran

Rallabandi

Heins³

et al. 2018

IEEE Trans. on Ind. Applicat.

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“…I x * s and I x s are the Laplace transforms of i x * t and i x t . In (7) and (8), K s_p , K s_i and K c_p , K c_d are parameters of speed PI controller and current PD controller, respectively. They are adjusted by Ziegler-Nichols method.…”

Section: Drive and Control Principle Of The Pmblmmentioning

confidence: 99%

“…Higher efficiency and power density than the DC motor and induction motor of the same size are the most important characteristics of it [1][2][3][4]. In terms of the magnetic field of the rotor, the backelectromotive force (back-EMF) of PMBLM is always designed into two types: the trapezoidal waveform and sinusoidal waveform [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Parabola‐trapezoid and staircase current supply methods for PMBLM with full inverter utility and reduced torque ripple

Yang

Zhu

2018

IET Electric Power Applications

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The permanent magnet brushless motors (PMBLM) are utilised extensively in many high-performance applications where smoothness of output torque is necessary. When driven with conventional square-wave current, the PMBLM is hard to make full use of inverter capacity because of short current supply time. Besides, it is hard to produce smooth output torque because the phase inductances slow down the desired step response of the phase current seriously. Although the sinusoidalwave current changes continuously, there exists a fixed-frequency torque ripple for trapezoid back-electromotive force motor. To solve the problems, two novel current supply methods, called as staircase waveform and parabola-trapezoid waveform, are proposed in this study. With the same phase current magnitude as square waveform, the staircase waveform can output two times torque with low-resolution position sensors. The parabola-trapezoid supply method can further improve the smoothness of doubled output torque by unique parabolic rising and falling edge waveform design, while a high-resolution position sensor is needed. Simulation and experimental tests of four different current supply methods are given to corroborate the effectiveness of the proposed method in inverter utility and torque ripple reduction.

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“…Especially, the rare earth PM motor, which was first proposed in the 1970s, has the advantages of high reliability, small size, and high-power density, and is widely used in aerospace, national defence, industrial production, equipment manufacturing, and daily life [1]. It includes PM synchronous motors [2,3], PM brushless dc motors [4,5], linear PM actuators [6,7], flux-switching PM motors [8,9] etc., covering almost the entire electrical machinery industry. However, the cost of rare-earth elements is generally much higher than that of other materials used in PM motors, so increasing the magnet utilisation is of great importance to control the cost and volume of PM motors [10,11].…”

Section: Introductionmentioning

confidence: 99%

Semi‐interior permanent‐magnet actuators for high‐magnet‐utilisation and low‐cost applications

Luo

Sun

2018

IET Electric Power Applications

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Generally, for small-and medium-sized tubular permanent-magnet (PM) linear actuators, PM structures can be divided into two categories. One is interior PM (IPM) structure and the other is surface-mounted PM (SPM), involving a compromise between flux per pole and magnet leakage flux. This study proposes a novel semi-IPM (s-IPM) structure for a tubular linear actuator having the advantages of high flux per pole of IPM and small magnet leakage flux of SPM. The air-gap flux density and the average thrust are analysed and compared with IPM and SPM by the magnetic equivalent circuit and finite element analysis. Moreover, the s-IPM structure is also compared with Halbach PM array in terms of the average thrust and the magnet utilisation. Four prototype actuators with different PM structures are built and tested. Both the theoretical and experimental results show that the magnet utilisation of the s-IPM structure is the largest while its cost and volume are approximately unchanged. The proposed s-IPM actuators are of great prominence in high-magnet-utilisation and low-cost applications.

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Analytical Calculation of Back EMF Waveform for Linear PM Motors in Slotted and Slotless Structures

Cited by 42 publications

References 20 publications

Coreless and Conventional Axial Flux Permanent Magnet Motors for Solar Cars

Coreless and Conventional Axial Flux Permanent Magnet Motors for Solar Cars

Parabola‐trapezoid and staircase current supply methods for PMBLM with full inverter utility and reduced torque ripple

Semi‐interior permanent‐magnet actuators for high‐magnet‐utilisation and low‐cost applications

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