• Title/Summary/Keyword: Inductance saturation

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Study on Switching Angle Characteristics for Driving Performance Improvement of SRM Drive (SRM 드라이브의 운전성능 향상을 위한 스위칭각 특성에 관한 연구)

  • 오석규;최대완;안진우
    • The Transactions of the Korean Institute of Power Electronics
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    • v.6 no.6
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    • pp.506-513
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    • 2001
  • The torque of an SRM depends on the phase current and derivative of inductance. But an SRM is difficult to control the desired torques because of saturation in magnetic circuit An SRM is controlled by parameters of input voltage, and switch on , off angle The switch on off angles of an SRM regulate the magnitude and shape of current waveform and decide the magnitude and shape of torque This paper proposes an the optimization control scheme by adjusting both the switch on an switch off angle . The switch off angles are decided by reference of efficiency using simulation and experiments. The switch on angles are decided by load torque , And the dwell angles are controlled for torque control and speed control using GA-neural network which is used to simulated the reasonable switching angle.

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Charging and Persistent-Current Mode Operating Characteristics of BSCCO Magnet Using High-Tc Superconducting Power Supply (고온 초전도 전원장치를 이용한 BSCCO Magnet의 충전 및 영구전류 운전 특성)

  • Jo, Hyun-Chul;Yang, Seong-Eun;Kim, Young-Jae;Hwang, Young-Jin;Yoon, Yong-Soo;Chung, Yoon-Do;Ko, Tae-Kuk
    • Progress in Superconductivity and Cryogenics
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    • v.11 no.1
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    • pp.30-34
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    • 2009
  • This paper deals with charging and persistent-current mode operating characteristics of BSCCO magnet load using high-temperature superconducting (HTS) power supply. The HTS power supply consists of two heater-triggered switches, an iron-core transformer with the primary copper winding and the secondary BSCCO solenoid, and a BSCCO magnet load. The magnet load was fabricated by double pancake winding and its inductance is about 21 mH. A hall sensor was installed at the middle of the magnet load to measure the current in the load. In order to investigate the efficient pumping characteristics, operating tests of heater-triggered switch with respect to dc heater current were carried out, and the electromagnet current was determined by considering saturation characteristics of its iron core. The saturation characteristics of charged current in the magnet load were observed with respect to various pumping periods: 12 s, 14 s, 24 s and 32 s. After charging the magnet load, the persistent current was measured. The operating characteristics of the persistent current mode were mainly determined by joint resistance and magnet load.

Parameter Extraction of DQ-Axis Inductance and Back-EMF Constant For IPM Type Motors Based on Nonlinear Finite Element Analysis (비선형 효과를 고려한 IPM형 전동기의 DQ축 인덕턴스 및 역기전력상수 파라미터 추출)

  • Choi, Hong-Soon
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.56 no.3
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    • pp.519-523
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    • 2007
  • In this paper, we propose a precise parameter extraction of interior permanent magnet (IPM) motors based on finite element analysis. For the calculation of the two-axis inductances Ld and Lq, the slotting effect and cross magnetization due to torque angle are considered. It is examined that back electro-motive force (BEMF) constant is affected by the magnetic saturation in different ways dependent on motor types. Numerical analyses and some measurements are performed for a spoke type and a flux barrier type IPM motors

Characteristic Analysis of Permanent Magnet Assisted Synchronous Reluctance Motor for High Power Application (고출력 응용을 위한 영구자석 매입형 동기 릴럭턴스 전동기의 특성해석)

  • Jang Young-Jin;Kim Gi-Bok;Lee Jung-Ho;Kim Sang-Gil;Shin Heung-Kyo
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.53 no.10
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    • pp.585-596
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    • 2004
  • In this paper, finite element analysis for a PMASynRM is presented and the characteristic analysis of inductance and torque is performed under the effect of saturation. The focus of this paper is characteristic analysis of d and q-axis inductances and torque according to magnetizing quantity of interior permanent magnet for PMASynRM. The d and q-axis current component ratios, load angles of a PMASynRM are investigated quantitatively on the basis of the proposed analysis method and the experimental test. Comparisons are given with output characteristic curves of normal SynRM and those according to the load in PMASynRM, respectively And it is confirmed that the proposed model results in high output power performance.

The High-speed Operation of Single Phase Switched Reluctance Motor (단상 SRM의 고속 구동 제어에 관한 연구)

  • Ahn, Joonseon;Lee, Ju
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.54 no.10
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    • pp.470-476
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    • 2005
  • In this paper PU control scheme is presented. The proposed scheme has following features. The one is oft-starting method which is used for preventing to flow large current in motor phase winding when motor starts. The ther is the selection of the level of the over current. The first feature is implemented by increasing the PWM duty lowly, the second feature is implemented by limiting the magnitude of the phase current level by which the over heat f motor by copper losses and magnetic saturation decreases. By the analysis using FEM considering load condition, the peed of mode transition from PW to single pulse control is selected and confirmed by simulation that there is no ver current occurs during the mode transition. For the verification of proposed scheme, the simulation using MATLAB Simulink with considering non-linearity of inductance profile from FEM analysis is performed and the experiment with SRM drive system which has the DSP controller and single Phase SRM are peformed.

Effect on the Characteristics and Control Performance due to the Ventilation Hole Design of the Traction Motor (냉각 통풍홀 설계로 인한 견인 전동기 특성 및 제어 성능 영향 연구)

  • Kim, Ki-Chan;Lee, Jeong-Il;Kwon, Jung-Lock
    • Proceedings of the KIEE Conference
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    • 2001.07b
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    • pp.801-803
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    • 2001
  • On this study the motor design method with fairly good characteristics and control capability as well as cooling capability is presented with considering the magnetic effect due to ventilation hole, which is installed to prevent the temperature rise. When the input voltage rises due to critical variation in traction power supply system, the final ventilation hole is presented by checking the inductance parameter with clarifying the relation between saturation of the motor core and the ventilation hole.

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A Study on DC side Model of Current Source type Active Power Filters (전류원형 능동 전력 필터의 직류측 모델에 관한 연구)

  • Han, Hak-Guhn;Park, In-Gyu;Park, Jong-Keun
    • Proceedings of the KIEE Conference
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    • 1989.11a
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    • pp.180-185
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    • 1989
  • In the current source type active power filter, the DC current source is implemented using an inductor with large inductance by maintaining the inductor current constantly. In this case, to compensate the loss of the switching devices of the power converter and the inductor, some real power should be supplied to the filter from the source. This process is analyzed through the equivalent circuit which expresses the loss of the switching devices and the inductor with the equivalent resistor R. This work discusses the validation of this DC side equivalent circuit and points out the problems, through the experiments using the experimental active power filter with 220V, 10KVA ratings, and suggests a more accurate equivalent circuit which puts the saturation voltage of the power transistors and the threshold voltage of the diodes into consideration.

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A Study on Characteristics Analysis of Switched Reluctance Motor (스위치드 릴럭턴스 모터의 특성해석에 관한 연구)

  • Suh, Ki-Young;Lee, Huyn-Woo;Kim, Young-Mun;Mun, Sang-Pil
    • Proceedings of the KIEE Conference
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    • 2000.07e
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    • pp.152-156
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    • 2000
  • A Switched Reluctance Motor(SRM) has been widely studied for practical use due to recent development on technology of power electronics. Because of its advantage that are high speed driving, simple structure and easy variable-speed control, it is expected for applications to automo biles and others. However, it has some problems that are, for examples, relatively high torque ripples and electromagnetic noise. In this paper, a simple theory is presented to represent characteristic of a SRM and theoretical results are compared with experimental ones. In the theory, the inductance variations of a SRM are approximated as linear and winding resistances and the magnetic saturation are ignored. With these approximations, we derived some equations expressing load characteristics of a SRM. Also, the torque ripple was removed by applying a variable hysteresis band control.

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Improvement of Transient Characteristics at middle and low Speed Region of induction Motor using Adaptive identification (파라미터 적응동정에 의한 유도전동기의 중.저속운정 과도특성개선)

  • 이성근
    • Journal of Advanced Marine Engineering and Technology
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    • v.23 no.6
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    • pp.738-747
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    • 1999
  • Vector controlled induction motor have been widely used in high performance applications. How-ever the performance is sensitive to the variations of motor parameters especially the rotor time constant which varies with the temperature and the saturation of the magnetizing inductance. In this paper the authors propose new identifying method for time-varying parameters of an induction motor which is based on adaptive vector control with serial block algorithm. Vector con-trol system realized on synchronous frame and parameter identification system realized on sta-tionary frame are not easily affected by the vector control frame. Parameter mismatch in the control system results in heavy transient variation in speed and torque response. In order to compensate degradation of the responses at the middle and low speed region adaptive identifier is introduced. To verify the feasibility of this technique compute simu-lations carried out.

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Sensorless control of a SPMSM for driving cooling fans (냉각 팬 구동을 위한 SPMSM의 센서리스 제어)

  • Kim, Sang-Hoon;Kim, Ji-Min
    • Journal of Industrial Technology
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    • v.34
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    • pp.15-20
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    • 2014
  • Recently, PMSMs(Permanent Magnet Synchronous Motors) have become increasingly popular in various high-performance motor drive applications. However, the high-performance drive of PMSMs needs a position sensor such as a resolver, which increases not only the price of the system but also reduces the system reliability. This paper is on the implementation of sensorless control of a SPMSM, which drives a fan for cooling in appliances. In this paper, the rotor position for high-performance drive of a SPMSM is derived from back electromotive force (EMF) information proportional to the rotor speed. Also, the initial rotor position information for start-up is estimated from a saturation phenomenon of inductance. The validity of the proposed sensorless drives was confirmed by the experiment on the SPMSM drive systems for cooling fans of refrigerators and laptop computers.

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