비희토류 전동기의 효율 향상을 위한 Fan-shape type PMSM 설계 및 성능 분석

조수영(Sooyoung Cho),안한웅(Hanwoong Ahn),함상환(Sang-Hwan Ham),진창성(Chang-Sung Jin),이성구(Sung Gu Lee),이주(Ju Lee) 대한전기학회 2016 전기학회논문지 Vol.65 No.2

The rare earth output is concentrated in limited number of countries including China. Also the necessity for development of non-rare earth motor is getting signified due to the rapid increase of rare earth price and resource weaponizing policies. Non-rare earth motor is generally designed as spoke type PMSM (Permanent Magnet Synchronous Motor) in order to maximize the power density. Such spoke type PMSM has advantage in concentrating the flux but demonstrates lower efficiency compared to permanent magnet using Nd (Neodymium) permanent magnet. Therefore, applications with strong necessity for efficiency need rotor structure having improved efficiency compared to spoke type PMSM. Hence, this study suggested fan-shape type PMSM with somewhat lower power density but maximized efficiency. Fan-shape type PMSM is a rotor shape demonstrating outstanding reduction of iron loss compared to existing spoke type. Thus, this study analyzed the improvement of efficiency and reduction of loss arising from the suggested shape through parameter calculation.

적응형 노치 필터에 의한 PMSM을 이용한 선형 피드 시스템의 진동 억제

이동희 전력전자학회 2006 전력전자학회 논문지 Vol.11 No.3

The Permanent Magnet Synchronous Motor(PMSM) drive systems with ball-screw, gear and timing-belt are widely used in industrial applications such as NC machine, machine tools, robots and factory automation. These systems have torsional vibration in torque transmission from servo motor to mechanical load due to the mechanical couplings. This vibration makes it difficult to achieve quick responses of speed and may result in damage to the mechanical plant.This paper presents adaptive notch filter with auto searching function of vibration frequency to reject the mechanical vibration of linear feeder system with PMSM. The proposed adaptive notch filter can suppress the torque command signal of PMSM in the resonant bandwidth for reject the mechanical torsional vibration. However, the resonant frequency can vary with conditions of mechanical load system and coupling devices, adaptive notch filter can auto search the vibration frequency and suppress the vibration signal bandwidth.Computer simulation and experimental results shows the verification of the proposed adaptive notch filter in linear feeder system with PMSM. Permanent Magnet Synchronous Motor(PMSM)는 볼스크류, 기어 및 타이밍 벨트를 이용하여 NC, 가공기, 로봇 및 공장 자동화를 포함하여 산업 시스템 전반에 널리 사용되고 있다. 이러한 PMSM과 부하의 결합으로 구성된 시스템은 동력의 전달에 있어서, 고유의 공진 주파수를 가지며 공진 주파수 대역에서의 기계계의 응답 특성은 매우 불안정하고, 기계 시스템의 손상을 일으키게 된다.본 논문에서는 PMSM을 이용한 직선 운동 시스템에서 기계적인 결합에 의한 기구부의 진동을 억제하기 위하여 진동 주파수를 자동으로 검출하여, 진동의 원인이 되는 토크 지령 신호를 억제하는 적응형 노치 필터를 포함하는 속도 제어 시스템을 제안한다. 하지만, 기계적인 진동 주파수와 주파수의 대역은 전동기에 결합된 결합 기구 및 부하에 따라서 변동하는 특성을 가지고 기계적인 진동의 크기도 진동원이 되는 신호에 따라 변동하므로, 이를 적응형 노치 필터부에서 이를 진단하여 진동 주파수를 자동으로 억제함으로써 안정적인 운전이 가능하도록 설계된다.본 논문에서 제안된 기계적인 진동을 억제하기 위한 적응형 노치 필터의 성능은 시뮬레이션 및 실험을 통하여 검증하였다.

외란의 변화가 있는 PMSM의 강인하고 정밀한 위치 제어에 대한 연구

이익선(Ik-Sun Lee),여원석(Won-Seok Yeo),정성철(Sung-Chul Jung),박건호(Keon-Ho Park),고종선(Jong-Sun Ko) 대한전기학회 2018 전기학회논문지 Vol.67 No.11

Recently, a permanent magnet synchronous motor of middle and small-capacity has high torque, high precision control and acceleration / deceleration characteristics. But existing control has several problems that include unpredictable disturbances and parameter changes in the high accuracy and rigidity control industry or nonlinear dynamic characteristics not considered in the driving part. In addition, in the drive method for the control of low-vibration and high-precision, the process of connecting the permanent magnet synchronous motor and the load may cause the response characteristic of the system to become very unstable, to cause vibration, and to overload the system. In order to solve these problems, various studies such as adaptive control, optimal control, robust control and artificial neural network have been actively conducted. In this paper, an incremental encoder of the permanent magnet synchronous motor is used to detect the position of the rotor. And the position of the detected rotor is used for low vibration and high precision position control. As the controller, we propose augmented state feedback control with a speed observer and first order deadbeat disturbance observer. The augmented state feedback controller performs control that the position of the rotor reaches the reference position quickly and precisely. The addition of the speed observer to this augmented state feedback controller compensates for the drop in speed response characteristics by using the previously calculated speed value for the control. The first order deadbeat disturbance observer performs control to reduce the vibration of the motor by compensating for the vibrating component or disturbance that the mechanism has. Since the deadbeat disturbance observer has a characteristic of being vulnerable to noise, it is supplemented by moving average filter method to reduce the influence of the noise. Thus, the new controller with the first order deadbeat disturbance observer can perform more robustness and precise the position control for the influence of large inertial load and natural frequency. The simulation stability and efficiency has been obtained through C language and Matlab Simulink. In addition, the experiment of actual 2.5[kW] permanent magnet synchronous motor was verified.

외란의 변화가 있는 PMSM의 강인하고 정밀한 위치 제어에 대한 연구

이익선,여원석,정성철,박건호,고종선 대한전기학회 2018 전기학회논문지 Vol.66 No.11

Recently, a permanent magnet synchronous motor of middle and small-capacity has high torque, high precision control and acceleration / deceleration characteristics. But existing control has several problems that include unpredictable disturbances and parameter changes in the high accuracy and rigidity control industry or nonlinear dynamic characteristics not considered in the driving part. In addition, in the drive method for the control of low-vibration and high-precision, the process of connecting the permanent magnet synchronous motor and the load may cause the response characteristic of the system to become very unstable, to cause vibration, and to overload the system. In order to solve these problems, various studies such as adaptive control, optimal control, robust control and artificial neural network have been actively conducted. In this paper, an incremental encoder of the permanent magnet synchronous motor is used to detect the position of the rotor. And the position of the detected rotor is used for low vibration and high precision position control. As the controller, we propose augmented state feedback control with a speed observer and first order deadbeat disturbance observer. The augmented state feedback controller performs control that the position of the rotor reaches the reference position quickly and precisely. The addition of the speed observer to this augmented state feedback controller compensates for the drop in speed response characteristics by using the previously calculated speed value for the control. The first order deadbeat disturbance observer performs control to reduce the vibration of the motor by compensating for the vibrating component or disturbance that the mechanism has. Since the deadbeat disturbance observer has a characteristic of being vulnerable to noise, it is supplemented by moving average filter method to reduce the influence of the noise. Thus, the new controller with the first order deadbeat disturbance observer can perform more robustness and precise the position control for the influence of large inertial load and natural frequency. The simulation stability and efficiency has been obtained through C language and Matlab Simulink. In addition, the experiment of actual 2.5[kW] permanent magnet synchronous motor was verified.

Research on Radial Force of Permanent Magnet Synchronous Motor Based on Maxwell

Zhongguo Yang,Wei Li,Yanan Gou,Tianfang Cai 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.6

In the existing permanent magnet motor drive system, the vibration and noise problems caused by motor and driver are more and more obvious and complex. Among them, the radial electromagnetic force fl uctuation problem of permanent magnet synchronous motor (PMSM) stator is the most important cause of vibration and noise. The radial electromagnetic force fl uctuation of PMSM stator is the main source of vibration and noise. In order to lay a solid foundation for studying the distribution of vibration and noise, the radial electromagnetic force of 12 slot 14 pole PMSM is calculated by combining Maxwell stress method and Lorentz force method. Based on the Maxwell platform, a solution model is established to analyze the radial electromagnetic force of motor in time and space. The time–space analysis diagram of radial electromagnetic force in no-load section and load section is given; it is helpful to avoid resonance point and realize low-noise design of motor.

Comparison of Characteristics of Double-Sided Permanent-Magnet Synchronous Motor/Generator According to Magnetization Patterns for Flywheel Energy Storage System Using an Analytical Method

Kwan-Ho Kim,Hyung-Il Park,Seok-Myeong Jang,Jang-Young Choi IEEE 2015 IEEE transactions on magnetics Vol.51 No.3

<P>The flywheel energy storage system (FESS) is a very promising energy storage technology used in recent years because of its advantages, such as high energy density and large instantaneous power. In the case of a permanent-magnet (PM) synchronous motor/generator (PMSM/G) used for driving the FESS, a reduction in torque ripple is necessary because operating ranges are high speed. In this paper, we study the use of a double-sided PMSM/G for driving the FESS to considerably reduce iron loss that occurs in the idling mode. To develop an appropriate model for sinusoidal wave operation, we compare the characteristics of a double-sided PMSM/G having a Halbach magnetized PM and a parallel magnetized PM using an analytical method. On the basis of the compared results, the most suitable model for sinusoidal wave operation is manufactured.</P>

Characteristics Analysis of Novel Outer Rotor Fan-type PMSM for Increasing Power Density

Sooyoung Cho,Geochul Jeong,Jong suk Lim,Ye Jun Oh,Sang-Hwan Ham,Ju Lee 한국자기학회 2018 Journal of Magnetics Vol.23 No.2

Most studies on non-rare-earth motors focus on the inner-rotor-type motors, and little research has been conducted on the outer-rotor-type motors. This paper suggests a novel outer rotor fan-type permanent magnet synchronous motor (PMSM) as a non-rare earth outer rotor motor. To verify the superiority of the efficiency and output power, the novel outer rotor fan-type PMSM is compared with the surface permanent magnet synchronous motor (SPMSM), which is primarily used as an outer-rotor-type motor. The detailed design and characteristics of the outer rotor fan-type PMSM was also studied. Finally, the output characteristics of the outer rotor fan-type PMSM were verified through prototyping.

300W급 이중 공극 구조 PMSM 설계 및 출력 특성에 관한 연구

김승주(Seung-Joo Kim),김윤환(Youn-Hwan Kim),최한석(Han-Suk Choi),문재원(Jae-Won Moon) 한국조명·전기설비학회 2014 조명·전기설비학회논문지 Vol.28 No.4

This paper suggests the dual-gap for generating power and increasing the torque of a direct-drive permanent magnet synchronous motor in a hybrid-cycle. To consider easy coil winding, we applied a structure of dual-gap for the permanent magnet synchronous motor (PMSM). Because the torque of PMSM with the dual-gap is very large, we are designed the appropriate specifications of the PMSM by selected the appropriate dual-gap slot and poles combination. The prototype model is selected by design theory for increasing torque and maximizing output power of PMSM. And the detailed structure design of the model was designed by the loading distribution method. The PMSM models were analyzed by finite element method. Finally, we have suggested appropriate rotor structure has benefit to further increasing torque and prevent decreasing of the output power in PMSM with dual-gap.

Real-Time Simulation of Permanent Magnet Synchronous Motor Considering Harmonic Currents Based on FPGA

Zhong Zaimin,Shao Zhongshu,Bao Yong 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.6

The real-time simulation platform of constant d–q axis inductance parameter permanent magnet synchronous motor model only considers the fundamental wave of magnetic fi eld and it cannot accurately describe the spatial harmonic characteristics of the motor. Thus, this platform is not applicable in the developing and testing of control algorithms suppressing torque ripple and harmonic current. Aiming at this problem, a hardware-in-the-loop platform is built using an analytical motor model called “distributed parameter model” based on magnetic co-energy reconstruction. This model describes the variation of magnetic co-energy, fl ux linkage, voltage and torque with reference to rotor spatial position. So, it can accurately refl ect the nonlinear characteristics including saturation, slotting eff ects and non-sinusoidal back-EMF. The model is numerically discretized and compiled by Verilog hardware language in FPGA, then tested with closed-loop FOC control algorithm. The real-time simulation can verify the control algorithm with real controller and the simulation step of the motor model is 1 μs. Compared with the bench test results of the actual motor, the spatial harmonic characteristics of the motor in the real-time simulation platform are verifi ed.

Field Circuit Coupling Optimization Design of the Main Electromagnetic Parameters of Permanent Magnet Synchronous Motor

Guang-Xu Zhou,Ren-Yuan Tang,Dong-Hee Lee,Jin-Woo Ahn 대한전기학회 2008 Journal of Electrical Engineering & Technology Vol.3 No.1

The electromagnetic parameters of a permanent magnet synchronous motor (PMSM) such as the open load permanent magnet flux, d axis reactance Xd, and q axis reactance Xq, are most essential to the performance analysis and optimization design of the motor. Based on the numerical analysis of the 3D electromagnetic field, the three electromagnetic parameters of permanent magnet synchronous motors with U form interior rotor structures are calculated by FEA. The rules of the leakage coefficient and reactance parameters changing with the air gap length, permanent magnet magnetism length, and isolation magnetic bridge dimensions in the rotor are given. The calculated values agree well with the measured values. The FEA results are integrated with the self compiled electromagnetic design program to optimize the prototype motor. The tested performances of the prototype motor prove that the method is suitable for the optimization of motor structure.