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극 슬롯 조합에 따른 버니어 영구자석 전동기 손실 특성 분석
권혁성,서장호 한국조명.전기설비학회 2021 조명·전기설비학회논문지 Vol.35 No.5
Vernier Permanent-Magnet Synchronous Motor(VPMSM) is a motor that improves the back EMF and torque of the motor by using the spatial harmonic component of the air-gap magnetic flux density. In addition to the fundamental component, harmonics also contribute to the VPMSM performance, so they have high torque performance, and for this reason, many studies on VPMSM are being conducted. However, since it is affected by spatial harmonics, the motor must be designed so that the spatial harmonics increase, so VPMSM has different loss characteristics from conventional motors. In this paper, the loss characteristics of VPMSM were analyzed and compared with the loss characteristics of conventional motors. In addition, the loss characteristics change according to the combination of the number of poles and slots of VPMSM were explained. To this end, the loss characteristics of several VPMSMs and conventional motor designed under the same conditions were analyzed through the finite element method(FEM), and the design guidelines of the VPMSM were presented through the results.
Winding Factor of Vernier Permanent Magnet Motor
Kwon Hyuk-Sung,Yeo Han-Kyeol,Seo Jangho 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.4
Several studies have been reported on vernier permanent magnet synchronous motors (VPMSMs) using spatial harmonics in air-gap fl ux density owing to their low-speed high-torque characteristics. However, coeffi cients that can predict the performance of VPMSMs in motor design processes have not been extensively researched. The gear ratio indicates the degree of amplifi cation of the spatial harmonics, but there is a big diff erence between the performances predicted using the gear ratio and the actual performance of VPMSMs. The winding factor can estimate the magnitude of the electromotive force (EMF) of the motor. Although the winding factor is suitable for conventional motors, it cannot be applied to VPMSM, which amplifi es EMF through spatial harmonics. In this study, we investigated the winding factor of VPMSMs and proposed a winding factor calculation method suitable for VPMSMs. Based on the analytical method, the proposed calculation method could instantly and accurately estimate the winding factor of VPMSMs. With this method, the EMF performance of VPMSMs can be predicted according to the pole–slot combination. To verify the validity of the proposed method, we compared the gear ratio, the proposed winding factor, and the magnitude of the EMF obtained by the fi nite element method.
A Small Axial-Flux Vernier Machine With Ring-Type Magnets for the Auto-Focusing Lens Drive System
Zhao, Fei,Kim, Min-Soo,Kwon, Byung-Il,Baek, Jong-Ho IEEE 2016 IEEE transactions on magnetics Vol.52 No.7
<P>A small axial-flux permanent magnet vernier motor (PMVM) is investigated to satisfy the requirements of high drive torque, low speed, low noise, and low-power consumption for application in the camera auto-focusing lens drive. The proposed axial-flux PMVM is constructed with ring-type magnets in the rotor and has strict dimensional constraints due to its location in the lens barrel. The design approach is an alternative motor design method coupled with the analytical method or the finite-element method. The proposed motor's electromagnetic performance was verified by means of both methods. Finally, a prototype was built and tested, showing an adequate range of speed while also meeting the noise limits, and consuming less than 2 W of power.</P>
Design of Vernier Motor Considering PM Irreversible Demagnetization for Abnormal Operating Condition
Dae-Woo Kim,Jun-Young Song,Do Hyun Kang,Jin-Seok Kim,Yong-Jae Kim,Sang-Yong Jung 한국자기학회 2019 Journal of Magnetics Vol.24 No.1
This study investigates the design of a flux modulation pole (FMP)-type vernier motor considering irreversible demagnetization in a permanent magnet (PM). The FMP-type vernier motor, which has a distinct configuration compared to the conventional vernier motor, is taken into account because the PM placed at its stator is vulnerable to irreversible demagnetization. The demagnetization ratio of the PM is analyzed and compared using two different types of flux barrier, namely the bar- and delta-type barriers with varying design parameters. To guarantee reliability of the motor performance, both normal and abnormal operating conditions are considered for each type of flux barrier. Finally, selected models are compared to the base FMP-type vernier motor model in terms of demagnetization ratio and output torque.
Mover Field Oriented Control of Linear Permanent-Magnet Vernier Motor Considering Loss Minimization
Xianqun Qiu,Wenxiang Zhao,Qian Chen,Dezhi Xu 대한전기학회 2017 Journal of Electrical Engineering & Technology Vol.12 No.3
A linear permanent-magnet vernier (LPMV) motor has magnets and windings in the short mover, which is very suitable for long stroke applications. This paper proposed a new field oriented control with space vector pulse width modulation for the LPMV motor, which considers loss minimization. First, the topology of the LPMV motor is briefly presented. Then, the mathematical model is derived, and the mover field oriented control strategy is proposed. Also, the loss analysis is performed. Finally, the simulated and experimental results are given, verifying the feasibility and effectiveness of the proposed control strategy.
Mover Field Oriented Control of Linear Permanent-Magnet Vernier Motor Considering Loss Minimization
Qiu, Xianqun,Zhao, Wenxiang,Chen, Qian,Xu, Dezhi The Korean Institute of Electrical Engineers 2017 Journal of Electrical Engineering & Technology Vol.12 No.3
A linear permanent-magnet vernier (LPMV) motor has magnets and windings in the short mover, which is very suitable for long stroke applications. This paper proposed a new field oriented control with space vector pulse width modulation for the LPMV motor, which considers loss minimization. First, the topology of the LPMV motor is briefly presented. Then, the mathematical model is derived, and the mover field oriented control strategy is proposed. Also, the loss analysis is performed. Finally, the simulated and experimental results are given, verifying the feasibility and effectiveness of the proposed control strategy.
Comparison of Three Magnet Array-type Rotors in Surface Permanent Magnet-type Vernier Motor
Kataoka, Yasuhiro,Takayama, Masakazu,Matsushima, Yoshitarou,Anazawa, Yoshihisa Journal of International Conference on Electrical 2013 Journal of international Conference on Electrical Vol.2 No.1
Surface permanent magnet-type vernier motors with three magnet array-type rotors (parallel magnetized type, repulsion type, and Halbach type) are compared based on the pull-out torque. It was clarified that increasing the rotor radius increases the pull-out torque at a fixed three-phase alternating voltage. The mechanism for the pull-out torque increase on each magnet array type was different, when the effects of the increase were analyzed based on an induced electromotive force and a synchronous reactance. As a result, the design of the Halbach-type rotor was found to be especially effective for achieving high pull-out torque, because this array type achieves a large induced electromotive force $E_0$ and a small synchronous reactance $x_s$.
Design of Surface Permanent Magnet-type Vernier Motor
Kakihata, Hironori,Kataoka, Yasuhiro,Takayama, Masakazu,Matsushima, Yoshitarou,Anazawa, Yoshihisa Journal of International Conference on Electrical 2013 Journal of international Conference on Electrical Vol.2 No.2
In this paper, the authors designed a surface permanent magnet (SPM)-type vernier motor whose maximum output is more than 5.2 kW, whose power factor at 4 kW is more than 90%, and whose efficiency at 4 kW is 85% under the conditions that the operating voltage, frequency, and synchronous speed are 400 V, 50 Hz, and 100 min-1, respectively.