• Title, Summary, Keyword: high-speed permanent magnet synchronous motors

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Analysis on the Core Loss and Windage Loss in Permanent Magnet Synchronous Motor for High-Speed Application (고속으로 운전되는 영구자석형 동기전동기의 철손 및 풍손 해석)

  • Jang, Seok-Myeong;Ko, Kyoung-Jin;Cho, Han-Wook
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.55 no.10
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    • pp.511-520
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    • 2006
  • Recently, more attention has been paid to the development of high-speed permanent magnet (PM) synchronous motors, since they are conductive to high efficiency, high power density, small size, and low weight. In high-speed PM machines, core loss and windage loss form a larger proportion of the total losses than usual in conventional mid- or low speed machines. This article deals with the analysis on the core loss and windage loss in PM synchronous motor for high-speed application. Using the data information from a manufacturer and non-linear curve fitting, this paper investigates the magnetic behavior and its core losses in the stator core using the electrical steels. And, the windage loss is calculated according to the variation of the rotational speed, motor inner pressure and temperature.

Optimal current angle control method of interior permanent magnet Synchronous Motors (매입형 영구자석 동기전동기의 최적 전류각 제어)

  • 김명찬;김종구;홍순찬
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.45 no.3
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    • pp.352-357
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    • 1996
  • Recently, Permanent Magnet Synchronous Motor(PMSM) drives are widely used for industrial applications due to its high efficiency and high power factor control strategy. PMSM generally have two classifications such as the SPMSM(Surface Permanent Magnet Synchronous Motors) and IPMSM(Inter Permanent Magnet Synchronous Motors). IPMSA has economical merits over SPMSM in higher speed range, mechanical robustness, and higher power rate by the geometric difference. The maximum torque operation in IPMSM is realized by the current angle control which is to utilize additional reluctance torque due to a rotor saliency. In traction, spindle and compressor drives, constant power operation with higher speed range are desirable. This is simply achieved in the DC motor drives by the reduction of the field current as the speed is increased. However, in the PMSM, direct control of the magnet flux is not available. The airgap flux can be weakened by the appropriate current angle control to demagnetize. In this paper, the control method of optimal current vector in IPMSM is described in order to obtain the maximum torque or maximum output with the speed and load variations. The applied algorithm is realized by the proto system with torque and speed control Experimental results show this approach is satisfied for the high performance servo applications. (author). 6 refs., 9 figs., 1 tab.

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Improvement of the Thermal Behavior of the Secondary Part of Synchronous Linear Motors with High Speed and Thrust (고속.대추력 동기식 리니어모터 세컨더리 파트의 열특성 향상)

  • Eun, In-Ung
    • Journal of the Korean Society for Precision Engineering
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    • v.28 no.4
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    • pp.505-512
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    • 2011
  • Linear permanent magnet synchronous motors utilize high-energy product permanent magnet to produce high thrust, velocity and acceleration. Such motors are finding applications requiring high positioning accuracy and speed response, for example, machine tools, in the absence of mechanical gears and ball screw systems. A disadvantage of the linear motors is high power loss in comparison with rotary motors. For the application of the linear motors to machine tools, it is required to use water coolers and to improve the thermal behavior through insulation and structure optimization or control strategies. This paper presents the function of the secondary part of the linear synchronous motor as to the thermal behavior and the improving method. The result shows cooling pipe combined with an insulation layer is a suitable design for improving of the thermal behavior.

Analysis on the Rotor Losses in High-Speed Permanent Magnet Synchronous Motor Considering the Operating Condition (운전조건을 고려한 고속 영구자석형 동기전동기의 회전자 손실 해석)

  • Jang, Seok-Myeong;Choi, Jang-Young;Cho, Han-Wook
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.56 no.1
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    • pp.48-56
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    • 2007
  • In this paper, the rotor losses in high-speed permanent synchronous motor (PMSM) considering the operating condition are discussed. In order to maintain the mechanical integrity of a high-speed permanent magnet machine rotor intended for high-speed operation, the rotor assembly is often retained within a stainless steel or Carbon-Fiber/Epoxy sleeve. The sleeve is exposed to fields produced by the stator from either the slotting or the mmf harmonics that are not synchronous with rotor losses. On the basis of analytical field analysis, the rotor losses are analyzed. In particular, the no-load, rated with air-cooled, and forced water cooled conditions are considered. The results are validated extensively by comparison with non-linear finite element method (FEM).

Hybrid Sensor-less Control of Permanent Magnet Synchronous Motor in Low-speed Region

  • Yamamoto, Yasuhiro;Funato, Hirohito;Ogasawara, Satoshi
    • Journal of Power Electronics
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    • v.8 no.4
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    • pp.301-308
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    • 2008
  • This paper proposes a method of improving the stability in sensor-less control of permanent magnet synchronous motors. The control method for low-speed region is divided into two: One is a high frequency method, which involves a problem of reverse rotation once misdetection of the permanent magnet polarity should occur, and another one is a current drive method, which has a problem that phase and speed oscillations are caused by quick speed changes. Hence, authors propose adoption of the current drive method for the basic control system with added compensation of stabilization by means of the high frequency method. This combination secures stable control with no risk of reversal and less vibration. In addition, authors have also considered a frequency separation filter of a shorter delay time so that current control performance will not lower even when high frequencies are introduced. This filter has achieved simplified compensation using repetitive characteristic through the utilization of the periodicity of high frequency current. Simulation and experiment have been conducted to verify that the stable performance of this system is improved.

Speed sensorless control for Interior permanent magnet synchronous motors based on the fuzzy gain compensator (퍼지 이득 보상기틀 이용한 매입형 영구자석 동기전동기의 속도 센서리스 제어)

  • Kang, Hyoung-Seok;Shin, Jae-Hwa;Kim, Young-Jo;Kim, Young-Seok
    • Proceedings of the KIEE Conference
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    • pp.180-182
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    • 2007
  • An interior permanent magnet synchronous motors (IPMSM) are receiving increased attention for many industrial applications because of its high torque to inertia ratio, superior power density, and high efficiency. This paper presents algorithm for speed sensorless control based on an adaptive binary observer adding the fuzzy gain compensator. Effectiveness of algorithm is confirmed by the experiments.

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Design and Experimental Verification of an Interior Permanent Magnet Motor for High-speed Machines (고속회전기 적용을 위한 매입형 영구자석 전동기의 설계 및 실험적 검증)

  • Kim, Sung-Il;Lee, Geun-Ho;Lee, Chang-Ha;Hong, Jung-Pyo
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.59 no.2
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    • pp.306-310
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    • 2010
  • On account of small size and light weight, a high-speed machine is regarded as a key technology for many future applications of drive systems. In high-speed applications, permanent magnet synchronous motors have a number of merits such as high efficiency and high power density. Therefore, they are suitable for driving the air-blower of a fuel cell electric vehicle (FCEV) where space and energy savings are critical. Particularly, a surface-mounted permanent magnet synchronous motor (SPMSM) of them is mainly used as a high-speed machine. However, the motor has a fatal flaw due to a retaining can to maintain the mechanical integrity of a rotor assembly. The can results in the increase of magnetic air-gap length in the SPMSM. Thus, in this paper, an interior permanent magnet synchronous motor (IPMSM) is applied in order to drive the air-blower of FCEV instead of the SPMSM, and the experimental results of two models are compared to verify the capability of the IPMSM for high-speed applications.

Sensorless Scheme for Interior Permanent Magnet Synchronous Motors with a Wide Speed Control Range

  • Hong, Chan-Hee;Lee, Ju;Lee, Dong-Myung
    • Journal of Power Electronics
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    • v.16 no.6
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    • pp.2173-2181
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    • 2016
  • Permanent magnet synchronous motors (PMSMs) have higher torque and superior output power per volume than other types of AC motors. They are commonly used for applications that require a large output power and a wide range of speed. For precise control of PMSMs, knowing the accurate position of the rotor is essential, and normally position sensors such as a resolver or an encoder are employed. On the other hand, the position sensors make the driving system expensive and unstable if the attached sensor malfunctions. Therefore, sensorless algorithms are widely researched nowadays, to reduce the cost and cope with sensor failure. This paper proposes a sensorless algorithm that can be applied to a wide range of speed. The proposed method features a robust operation at low-speed as well as high-speed ranges by employing a gain adjustment scheme and intermittent voltage pulse injection method. In the proposed scheme the position estimation gain is tuned by a closed loop manner to have stable operation in tough driving environment. The proposed algorithm is fully verified by various experiments done with a 1 kW outer rotor-type PMSM.

Optimal Design for Starting -Torque of Line-Start Permanent Magnet Synchronous Motors (직립 기동 영구자석 동기전동기의 기동토크 최적화 설계)

  • Kim, Byong-Kuk;Moon, Ji-Woo;Kim, Mi-Jung;Lee, Byung-Jun;Cho, Yun-Hyun
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.56 no.8
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    • pp.1390-1396
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    • 2007
  • The line-start permanent magnet synchronous motor has a high efficiency and an advantage in constant speed operation regardless of the effect of load variation. However, it is difficult to predict the performance of characteristics accurately, because of the unbalanced starting torque with the initial starting position of the rotor and the generation of a break torque. In this paper the dynamic characteristics of the line-start permanent magnet synchronous motor are described and compared with those of the squirrel-cage induction motor through the simulation to find the characteristics of the permanent magnets and the rotor bars in the line-start permanent magnet synchronous motor. Finally this paper gives the comparison between the simulation results and the experimental results.

Design of Self-Starting Hybrid Axial Flux Permanent Magnet Synchronous Motor Connected Directly to Line

  • Eker, Mustafa;Akar, Mehmet;Emeksiz, Cem;Dogan, Zafer;Fenercioglu, Ahmet
    • Journal of Electrical Engineering and Technology
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    • v.13 no.5
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    • pp.1917-1926
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    • 2018
  • In view of the current state of the reserves of electric energy generated resources and the share of electric motors in electricity consumption, many researches and studies related to efficiency in electric motors are being made. The presented work is related to the Axial Flux Permanent Magnet Synchronous Motor (AF-PMSM), which has recently undergone significant work based on the development of magnet and motor technology. In this study, a novel AF-PMSM was designed analytically through Finite Element Method (FEM) which can be started by connecting to a line such as an asynchronous motor in a transient state and can operate with high efficiency and power factor after synchronization in steady state without the need for an expensive motor drive. According to the obtained FEM results, a design with an efficiency class of IE4 of 5.5 kW shaft power, a 4 poles motor was obtained. As a result, economic calculations indicate that the extra cost of the designed Line start AF-PMSM with respect to the asynchronous motor is rapidly compensated by energy saving due to a more efficient operation, especially constant speed operations. As a result of the analysis obtained, the targeted values are reached. For induction motors and radial flux permanent magnet synchronous motors, a good alternative motor that can operate with high efficiency and power factor has been obtained.