• Title/Summary/Keyword: turn-off angle

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Design of Switched Reluctance Motor for Minimizing the Torque Ripple (스위치드 릴럭턴스 전동기의 토오크 리플 저감 설계)

  • Kim, Youn-Hyun;Choi, Jae-Hak;Kim, Sol;Lee, Ju;RhYu, Se-Hyun;Sung, Ha-Kyung;Im, Tae-Bin;Borm, Jin-hwan
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.51 no.7
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    • pp.339-350
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    • 2002
  • Pole arcs, turn-on angle, and turn-off angle are major design factors, which affects Switched Reluctance Motor's torque performance. If these design factors are considered independently, the enhancement of SRM performance is restricted. Therefore, we need to consider pole arcs, turn-on angle and turn-off angle at the same time, when we design SR. In this paper, we analyze how these factors affect to torque ripple and average torque by using dynamic Finite Element Method(FEM) with derive circuit and present the good design results according to the various speeds. Especially, we formulate turn-on and turn-off angle from a voltage equation and present effective design range.

Determination of Optimal Turn-off Angle for SRM Converter Using Self-Tuning Method (SRM 컨버터에서 자기동조 방식에 의한 턴오프 각의 결정)

  • 장도현;문진영
    • The Transactions of the Korean Institute of Power Electronics
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    • v.3 no.4
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    • pp.418-425
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    • 1998
  • In this paper. determination method of turn-off angle in the SRM drives is proposed to maintain the high torque at a any turn-on angle, which is realized by using selHuning control method, During the sampling time. a number of P pulses from encoder are checked by using one-chip microprocessor. and compared with pre-checked a number of pulses A After calculating difference between two data, the turn-off angle moves forward or backward direction by the self-tuning m method, As repeating such process, the optimal turn-off angle is determined and the maximum torque is maintained T Though experiments, it is observed that motor speed is almost maintained if turn-off angle is adjusted automatically by s selHuning method when turn-ηn angle is changed.

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Self-Tuning Control of SRM for Maximum Torque with Current and Shaft Position Feedback

  • Seo Jong-yun;Yang Hyong-yeol;Kim Kwang-Heon;Lim Young-Cheol;Cha Hyun-Rok;Jang Do-Hyun
    • Proceedings of the KIPE Conference
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    • 2001.10a
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    • pp.351-354
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    • 2001
  • In this paper, we present self-tuning control of switched reluctance motor for maximum torque with phase current and shaft position sensor. Determination method of turn-on/off angle is realized by using self-tuning control method. During the sampling time, micro-controller checks the number of pulse from encoder and compare with the number of pre-checked pulse. After micro-controller calculates between two data, it moves forward or backward turn-off angle. When the turn-off angle is fixed optimal turn-off angle, the turn-on angle automatically moves forward or backward by a step using self-tuning control method. And then, optimal turn-off angle is searched once again. As such a repeating process, turn-on/off angle is moved automatically to obtain the maximum torque. The experimental results are presented to validate the self-tuning algorithm.

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Automatic Turn-off Angle Control for High Speed SRM Drives

  • Nashed Maged N.F.;Ohyama Kazuhiro;Aso Kenichi;Fujii Hiroaki;Uehara Hitoshi
    • Journal of Power Electronics
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    • v.7 no.1
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    • pp.81-88
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    • 2007
  • This paper presents a new approach to the automatic control of the turn-off angle used to excite the Switched Reluctance Motor (SRM) employed in electric vehicles (EV). The controller selects the turn-off angle that supports and improves the performance of the motor drive system. This control scheme consisting of classical current control and speed control depends on a lookup table to take the best result of the motor. The turn-on angle of the main switches of the inverter is fixed at $0^{\circ}C$ and the turn-off angle is variable depending on the reference speed. The motor, inverter and control system are modeled in Simulink to demonstrate the operation of the system.

Maximization average torque control of Switched Reluctance Motor using least square method (최소자승법을 이용한 Switched Reluctance Motor의 최대 평균토오크 제어)

  • 김춘삼;정연석
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.16 no.5
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    • pp.61-65
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    • 2002
  • RM(Switched Reluctance Motor)'s Torque is generated by phase-current and inductance profile. A new analytical concept is proposed to determine the turn-off angle for maximization of the torque output. This paper describes a new method to maximization the average torque of a current control Switched Reluctance Motor. It is based on the simplified turn-off angle equation using least square method. Simulations carried out on a three-phase 6/4 pole SRM justify the algorithm is described. The suggested maximization average torque is verified by simulation in this paper.

Output Voltage Control Method of a Switched Reluctance Generator using Turn-off Angle Control (소호각 제어를 이용한 Switched Reluctance Generator의 출력 전압 제어)

  • 김영조;전형우;김영석
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.50 no.7
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    • pp.356-363
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    • 2001
  • A SRG (Switched Reluctance Generator) has many advantages such as high efficiency, low cost, high-speed capability and robustness compared with other of machine. But the control methods that have been adopted for SRGs are complicated. This paper proposes a simple control method using the PID controller which only controls turn-off angles while keeping turn-on angles of SRG constant. In order to keep the output voltage constant, the turn-off angle for load variations is controlled by using linearity between the generated current and turn-off angle since the reference generated current can be led through the voltage errors between the reference and the actual voltage. The suggested control method enhances the robustness of this system and simplifies the hardware and software by using only the voltage and the speed sensors. The proposed method is verified by experiments.

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The Maximum Torque/Efficiency of SRM Driving for Self-Tuning Control (자기동조 제어에 의한 SRM의 최대 토크/효율 운전)

  • Seo J.Y.;Cha H.R.;Kim K.H.;Lim Y.C.;Jong D.H.
    • Proceedings of the KIPE Conference
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    • 2003.07b
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    • pp.677-680
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    • 2003
  • The control of the SRM(Switched Reluctance Motor) is usually based on the non-linear inductance profiles with positions. So determination of optimal switching angle is very different. we present self-tuning control of SRM for maximum torque and efficiency with phase current and shaft position sensor During the sample time, micro-controller checks the number of pre-checked pulse. After micro-controller calculates between two data, it move forward or backward turn-off angle. When the turn-off angle is fixed optimal turn-off angle, turn-on angle moves forward or backward by a step using self-tuning control method. And then, optimal turn-off angle is searched once again. As such a repeating process, turn-on/off angle is moves automatically to obtain the maximum torque and efficiency. The experimental results are presented to validate the self-tuning algorithm.

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A Study on Fuzzy Logic Torque Ripple Reduction by Turn-off Angle Compensation of LSRM (LSRM의 Turn-off보상에 의한 퍼지로직 토크리플저감에 관한 연구)

  • Sung, H.K.;Jho, J.M.;Lee, J.M.;Yu, M.W.;Kim, D.S.
    • Proceedings of the KIEE Conference
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    • 2005.07b
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    • pp.1616-1618
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    • 2005
  • In this paper, A fuzzy logic based turn-off angle compensator for torque ripple reduction in a linear switched reluctance motor is proposed. The turn-off angle, as a complex function of motor speed and current, is automatically changed for a wide speed range to reduce torque ripple. Simulation results are presented that show ripple reduction when the him-off angle compensator is used.

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Maximum Torque Operation of SRM by using a Self-tuning Control Method (SRM의 최대 토크 운전을 위한 자기동조 제어)

  • 서종윤;김광헌;장도현
    • The Transactions of the Korean Institute of Power Electronics
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    • v.9 no.3
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    • pp.240-245
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    • 2004
  • This paper presents a Switched Reluctance Motor(SRM) drive using the self-tuning control method to achieve the maximum torque. SRM has the difficulty to research it by an analytic method and to control the speed End torque because of the high nonlinearity. So, in this paper, the self-tuning control method is applied to relevantly controlling turn-on/off angle to operate at the maximum torque. Also, the feedback signals to control the turn-on/off angle are the encoder pulse and the increment of phase current. At first, n adequate turn-off angle is searched by itself and then a turn-on angle is done. As the relationship between turn-on and him-off angle is mutual dependent, the turn-on/off angle is controlled by a real time self-tuning control method in order to maintain the maximum torque. The proposed self-tuning Algorithm is verified by experiments.

Output Voltage Control Method of Switched Reluctance Generator using the Turn-off Angle Control

  • Kim Young-Jo;Choi Jung-Soo;Kim Young-Seok
    • Proceedings of the KIPE Conference
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    • 2001.10a
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    • pp.414-417
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    • 2001
  • SRG (Switched Reluctance Generator) have many advantages such as high efficiency, low cost, high-speed capability and robustness compared with characteristics of other machines. However, the control methods that have been adopted for SRGs are complicated. This paper proposes a simple control method using PID controller that only controls turn-off angles while keeping turn-on angles of SRG constant. The linear characteristics between the generated current and the turn-off angle can be used to control the turn-off angle for load variations. Since the reference current for generation can be produced from an error between the reference and the real voltage, it can be controlled to keep the output voltage constant. The proposed control method enhances the robustness of this system and simplifies the hardware and software by using only the voltage and speed sensors. The proposed method is verified by experimental results.

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