Finite-Element Analysis and Experiment of Current Superimposition Variable Flux Machine Using Permanent Magnet

Kohara, Akira; Hirata, Katsuhiro; Niguchi, Noboru; Ohno, Yuki

doi:10.1109/tmag.2016.2572659

Cited by 30 publications

(6 citation statements)

References 22 publications

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“…The force of the mover due to the 3-phase magnetic flux and 6-phase AC is defined as follows: From 7and (8), the interference of the force is zero. Thus, the movers can be independently driven [7,8]. The proposed actuator is controlled using vector control, and 3-phase and 6-phase ACs are transformed into d-q axis.…”

Section: Linear Vernier Actuator With Two Moversmentioning

confidence: 99%

Linear Vernier actuator with two movers

Heya

Hirata

Niguchi

2020

Transportation Systems and Technology

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Background: Linear motion devices for industrial machines and robots are expected to realize their high efficiency drive and simple structure. Usually, a feed screw mechanism composed of a rotary motor and a ball-screw or slide-screw is employed. However, it has some problems such as the decrease of the drive efficiency, flexibility against external forces, noise, etc. Various linear actuators and motors have been developed utilizing the feature of a direct drive. Aim: In this paper, we propose a novel linear actuator which 2 movers can be independently controlled using 3-phase and 6-phase superimposed currents for decreasing the size and weight of the system. The proposed linear actuator is driven by the operating principle of a vernier motor which is expected to achieve a high thrust force density per permanent magnet volume. Methods: The operating principle and the static thrust force characteristics of the proposed linear actuator are verified by an electromagnetic field analysis using 3-D finite element method, and the back electromotive force characteristics are also analyzed. In addition, the dynamic characteristics under position feedback control are analyzed. The control system uses a vector control using PID controller, and the control input is given by the 3-phase and 6-phase superimposed currents. Results: The static force characteristics were investigated. From the analyzed results, the force interference between the two movers was small. Moreover, the interference of the back electromotive force of the 3-phase and 6-phase movers were not observed. The movers could be independently driven under position feedback control using 3-phase and 6-phase superimposed currents. The dynamic characteristics analyses showed that the mover well followed a target position. From a step response, the time constant and the response of the position feedback system were investigated. Conclusion: This paper presents a linear vernier actuator with two movers. The basic structure and operating principle of the actuator were described. Moreover, the static characteristics and the dynamic characteristics under position feedback control were analyzed. It was found that the movers can be independently driven.

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Section: Linear Vernier Actuator With Two Moversmentioning

confidence: 99%

Linear Vernier actuator with two movers

Heya

Hirata

Niguchi

2020

Transportation Systems and Technology

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“…The DC coils between split stator teeth can also be replaced by radially-magnetised PM or Halbach PM array with variable PM arrangements [70][71][72][73][74]. Fig.…”

Section: Evolution Of Topologiesmentioning

confidence: 99%

Permanent magnet vernier machine: a review

El-Refaie

2019

IET Electric Power Applications

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Permanent magnet vernier machines (PMVMs) gained a lot of interest over the past couple of decades. This is mainly due to their high torque density enabled by the magnetic gearing effect. This study will provide a thorough review of recent advances in PMVMs. This review will cover the principle of operation and nature of magnetic gearing in PMVMs, and a better understanding of novel PMVM topologies using different winding configuration as well as different modulation poles and rotor structures. Detailed discussions on the choice of gear ratio, slot-pole combinations, design optimisation and role of advanced materials in PMVMs will be presented. This will provide an update on the current state-of-the art as well as future areas of research. Furthermore, the power factor issue, fault tolerance as well as cost reduction will be discussed highlighting the gap between the current state-of-the art and what is needed in practical applications.

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“…The relationship between x 0 and y can be given by (15) Substituting (14) into (15), x 0 can be written as (16) Substituting (16) into (6), d 0 can be simplified to (17) x m can be expressed as (18) Line P 0 P 1 can be expressed as (19) The analytical method is the same as the longitudinal of PM magnetic field lines. to the volume and length of flux tube) is based on magnetic field lines.…”

Section: Horizontal Pm Magnetic Field Linesmentioning

confidence: 99%

“…Flux leakage was calculated by Li and Chau [15], where the possible flux paths of a PM linear vernier machine were analyzed and identified with an ideal flux source, making it suitable only for bar PMs. FEA has become the first choice of method for electromagnetic calculations on account of its great applicability and accuracy [16][17][18][19][20][21][22][23]; however, FEA cannot obtain the exact results with a low computational cost. The lumped parameter analytical method (LPAM) of an electromagnetic system depends solely on simple empirical formulae and these calculations are very imprecise.…”

Section: Introductionmentioning

confidence: 99%

Analytical Method for the Magnetic Field Line Distribution of a Fan-shaped Permanent Magnet and the Calculation of Leakage Permeance

Meng¹,

Zhang²,

You³

et al. 2017

JMAG

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Leakage permeance of a permanent magnet (PM) is an important factor for improving the accuracy of electromagnetic device calculations based on a magnetic equivalent circuit (MEC). For PM leakage permeance calculations, the traditional simulation method of finite element analysis (FEA) and the lumped parameter analytical method (LPAM) have been considered; it was found that FEA has the disadvantage of a long calculation time and LPAM has low accuracy. The magnetic field lines distribution analytical method (MFLD) is proposed in this paper in order to raise computational efficiency and keep accuracy within a certain range. The electromagnetic features of open circuit fan-shaped PMs are presented by MFLD and finite element analysis (FEA) is adopted to match the MFLD results. In order to verify the validity of the proposed method in a magnetic system, the working points of PMs in an electromagnetic actuator are calculated, and the numerical results compared with the experimental results.

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Finite-Element Analysis and Experiment of Current Superimposition Variable Flux Machine Using Permanent Magnet

Cited by 30 publications

References 22 publications

Linear Vernier actuator with two movers

Linear Vernier actuator with two movers

Permanent magnet vernier machine: a review

Analytical Method for the Magnetic Field Line Distribution of a Fan-shaped Permanent Magnet and the Calculation of Leakage Permeance

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