• Title/Summary/Keyword: Inductance saturation

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A Compensation Method for Mutual Inductance Variation of the Induction Motor by Using Improved Speed Estimator (개선된 속도 추정기에 의한 유도전동기 자화 인덕턴스 변동 보상법)

  • 최정수;김영석;김상욱
    • Proceedings of the KIPE Conference
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    • 1999.07a
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    • pp.505-508
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    • 1999
  • Conventional adaptive speed estimators cannot avoid the influence of the non-linear inductance variation under the saturation conditions. Without speed sensors, it is difficult to identify the inductance variation using a reactive power mode because the model contains a term of the rotor speed. In this paper, we propose a novel speed estimator having hybrid architecture in order to estimate both the rotor speed and the inductance variation simultaneously when the motor flux is saturated. Proposed estimator consists of the error between the flux obtained from the stator voltage equation and the flux estimated from the rotor flux observer. Introducing a new correction term into the estimator increases the estimation ability of the conventional speed estimator even though the motor flux is saturated. The convergence of the speed estimation error is examined by simulation Furthermore, the experimental results show the validity of the proposed method.

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Torque Control Scheme of Switched Reluctance Motor using Neural Network (신경회로망을 이용한 SRM의 토오크 제어)

  • 정연석;이장선;김윤호
    • Proceedings of the KIPE Conference
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    • 1999.07a
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    • pp.171-174
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    • 1999
  • The torque of SRM is developed by phase currents and inductance variation. Phase currents and inductance variation. Phase current is often the controlled variable in electrical motor drives, so it seems natural to use closed loop current controllers. However, the highly nonlinear nature of switched reluctance motors makes optimisation of closed loop current controlled difficult because of saturation effect in magnetic circuit. Therefore, torque generation region is nonlinearly varied according to phase current and rotor position. This paper describes the torque control scheme with neural network that can control varied with load torque. The torque control is simulated by PSIM.

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Maximum Torque Control of Synchronous Reluctance Motor including iron loss and saturation (철손과 포화를 고려한 동기 릴럭턴스 모터의 최대토크제어)

  • Baek, Dong-Gi;Kim, Min-Tae;Hwang, Yeong-Seong;Seong, Se-Jin
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.49 no.2
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    • pp.116-122
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    • 2000
  • In the high speed range for salient type synchronous reluctance motor, the effect of iron loss can not be negligible. We have investigated the voltage equations including iron loss from the model that is added the equivalent iron loss in the equivalent inductance in series. In this paper, we derive Ld linear approximate equation from saturation range of Ld, Lq vs applied voltage characteristics and obtain equations including saturation and iron loss related to maximum torque control using Ld. The effect of saturation and iron loss is investigated under maximum torque control. And we show that the proposed maximum torque control scheme achieves the desired performances through experimental results.

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Design of a CT Saturation Detection Technique with the Countermeasure for a Spike Signal

  • Kang, Yong-Cheol;Yun, Jae-Sung
    • KIEE International Transactions on Power Engineering
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    • v.3A no.2
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    • pp.85-92
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    • 2003
  • When a current transformer (CT) is saturated, the wave-shape of the secondary current is distorted and contains points of inflection, which correspond to the start or end of each saturation period. Discontinuity in the first-difference function of the current arises at points of inflection, where the second and third differences convert into pulses that can be used to detect saturation. This paper describes the design and evaluation of a CT saturation detection technique using the third-difference function and includes the countermeasure for a spike signal. Test results clearly demonstrate that the algorithm successfully detects the start and end of each saturation period irrespective of the remanent flux and magnetization inductance in the saturated region. This paper concludes by describing the results of hardware implementation of the algorithm using a DSP.

Magnetic Saturation Effect on the Rotor Core of Synchronous Reluctance Motor

  • Kim, Ki-Chan
    • Journal of Electrical Engineering and Technology
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    • v.6 no.5
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    • pp.634-639
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    • 2011
  • This paper presents a study on the design parameters that consider the magnetic saturation effect in a rotor core of a synchronous reluctance motor. Two important design parameters in a rotor are selected to analyze the saturation effect of a synchronous reluctance motor, particularly in a rotor core. The thickness of the main segment, which is the main path of the d-axis flux, and the end rip, which affects the q-axis flux, are analyzed using the d-axis and q-axis inductances. Moreover, the characteristics of torque and torque ripple when magnetic saturation takes place are analyzed. The saturation effect is verified by comparing the reluctance torque between the experiment and FEM simulation.

Study on Electric and Magnetic Characteristics of Engine Oil in Transport Truck (운송용 트럭에 대한 엔진오일의 전기·자기적 특성연구)

  • Kim, Man Jae;Lee, Woo Sin;Jung, Jong Hoon;Lee, Sang Hoon
    • Transactions of the Korean Society of Automotive Engineers
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    • v.22 no.3
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    • pp.166-170
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    • 2014
  • In this paper, we investigate the electric and magnetic properties of the engine oil, and estimate its changing time in transport truck. The four diesel trucks are selected, and the capacitance and inductance are investigated with parallel capacitor and induction coil, respectively. The measured capacitance gradually increases up to 10,000~14,000 km due to the activation of antioxidant, and then decreasing phenomena happen. The inductance decreases and the saturation began in 10,000~14,000 km range. Although the behavior of inductance is different from that of capacitance, but changing points are similar. From those results, we can estimate the changing time of engine oil is around 10,000~14,000 km and the inductance can be used for monitoring of engine oil in transport trucks.

Inductance Measurement of Interior Permanent Magnet Synchronous Motor in Stationary Frame of Reference

  • Lee, Geun-Ho;Choi, Woong-chul;Lee, Byeong-Hwa;Jung, Jae-Woo;Hong, Jung-Pyo
    • Journal of Magnetics
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    • v.16 no.4
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    • pp.391-397
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    • 2011
  • An inductance measurement method for interior permanent magnet synchronous machine (IPMSM) is proposed in this paper. In this method, the motor is measured at standstill condition, and only a 3-phase voltage source, an oscilloscope and a DC voltage source are required. Depending on the deductive dq-axis voltage equations in the stationary frame of reference, the dq-axis inductances at different current magnitude and vector angle can be calculated by the measured 3-phase voltages and currents. And hence, the saturation and cross-magnetizing effect of the inductances are measurable. This paper introduces the principle equations, experiment setup, data processing, and results comparison on the concentrated-winding and distributed-winding IPMSMs.

Torque-Fluctuation Reduction Inverter for SRM Driving (SRM구동용 맥동토오크 저감형 인버어터에 관한 연구)

  • 박성준;추영배;김철우
    • The Transactions of the Korean Institute of Power Electronics
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    • v.3 no.1
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    • pp.46-52
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    • 1998
  • This paper describes a current-shaping method for the production of constant torque of SRM under the nonlinear magnetic saturation condition. A current detection technique in the inductance increasing region and an approximation technique for modeling of nonlinear inductance profile are adopted. In the proposed system, a single switching angle control and voltage control is used to shape the current waveform for the generation of flat torque at any given load condition. Finally the validity of the proposed method was verified using a constructed 3HP 6/4 SRM.

Current Control of SRM using Neural Network (신경회로망을 이용한 SRM의 전류추종 제어)

  • Ahn, Sung-Ho;Oh, Seok-Gyu;Ahn, Jin-Woo;Hwang, Young-Moon
    • Proceedings of the KIEE Conference
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    • 1998.07a
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    • pp.257-259
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    • 1998
  • The Switched Reluctance Motor (SRM) has good properties to the adjustable speed control. But, high torque ripple and noise decrease this merit and make unstable state. Also, because of the saturation in the magnetic circuit, it is difficult to predict the inductance profile. If the inductance pronto is known, it's possible to make flat-top torque by applying some control strategy. This paper suggests method to develope flat-top torque using a Artificial Neural Network(ANN) method that can calculate a nonlinear inductance profile.

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