• Title/Summary/Keyword: Initial Rotor position

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A Comparison of the Initial Rotor Position Estimation Methods by Interior Central Pole Search Coils and Exterior Pole Search Coils for SRMs (돌극 관통 서치코일과 돌극외부 서치코일에 의한 SRM의 초기 회전자 위치검출법의 비교)

  • Yang H. Y.;Shin D. S.;Lim Y. C.
    • Proceedings of the KIPE Conference
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    • 2004.07b
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    • pp.936-939
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    • 2004
  • In this paper a comparison of the initial rotor position estimation methods by two type search coils for switched reluctance motor(SRM) is presented. The experimental results of the two methods show that the interior central pole search coil method has better performance than the exterior pole search coil method. The reason of the discrepancy in performance is described.

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Development of the Starting Algorithm of a Brushless DC Motor Using the Inductance Variation (인덕턴스의 변화를 이용한 브러시리스 DC 모터의 초기 구동 알고리즘 개발 및 구현)

  • Park, Jae-Hyun;Chang, Jung-Hwan;Jang, Gun-Hee
    • Journal of the Korean Society for Precision Engineering
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    • v.17 no.8
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    • pp.157-164
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    • 2000
  • This paper presents a method to detect a rotor position and to drive a BLDC motor from standstill to medium speed without any position sensor comparing the current responses due to the inductance variation in the rotor position. A rotor position at a standstill is identified by the current responses of six pulses injected to each phase of a motor. Once the motor stars up pulse train that is composed of long and short pulses is injected to the phase corresponding to produce the maximum torque and the next phase continuously. it provides not only the torque but also the information of the next commutation time effectively when the response of long and short pulses crosses each other after the same time delay. This method which is verified experimentally using a DSP can drive a BLDC motor to the medium speed smoothly without any rattling and time delay compared with the conventional sensorless algorithm.

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Performance Test of Sensorless Speed Control Logic for Gas Turbine Starter (가스터빈 기동장치 센서리스 속도제어로직 성능실험)

  • Ryu, Hoseon;Moon, jooyoung;Lee, Uitaek;Lee, Joohyun;Kang, Yunmo;Park, Manki
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.66 no.2
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    • pp.69-75
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    • 2017
  • The gas turbine static starter rotates the stationary synchronous machine by the interaction of the rotor and the stator. The detection from the initial position of the rotor has been an important issue to drive with optimum torque. Previously, the gas turbine starter was used by attaching the encoder to the synchronous machine, but the position and velocity of the rotor have been estimated by sensor-less method until recently due to the difficulty in attaching and detaching and damage caused by the shaft voltage noise. In this paper, Rotor initial(stationary state) position estimation, forced commutation control(speed less than 10%), and natural commutation control(speed more than 10%) method using magnetic flux with integrated terminal voltage were presented and the sensor-less speed control performance was verified. As a result of making and evaluating the 29 kVA synchronous machine and the starting device, the performance of each control mode was satisfactory. Furthermore, the applied technology is expected to be used for the development of the gas turbine starter of tens of MW class and the field application.

A Study on the Start-up Control for HDD Spindle Motors (HDD 스핀들 모터의 초기 구동 제어에 관한 연구)

  • Jeong, Jun
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.18 no.10
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    • pp.1065-1072
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    • 2008
  • A HDD adopts a sensorless brushless DC (BLDC) motor as a spindle motor. Because there is no direct sensor measuring rotor position. open loop commutations with inductive sensing are used to increase the rotor speed up to a certain speed where the zero crossings of the back electromotive force (EMF) voltage are measurable. Therefore, successful open loop commutations are necessary for the stable start-up control of the spindle motors. In this paper, the time scale and the number of the open loop commutations are employed for design parameters to guarantee robustness to torque constant variation and initial rotor position. The design results are verified by experiments on a very low current start-up of the spindle motor with various environment. The experimental results show that the design results can decrease the start-up failure rate considerably.

Sensorless Starting Method and Fuel Pressure Control of BLDC Motor for Fuel Pump of Vehicle (자동차 연료 펌프용 BLDC 모터의 센서리스 기동 및 연료 압력 제어)

  • Chang, Jin-Wook;Yoon, Duck-Yong
    • Transactions of the Korean Society of Automotive Engineers
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    • v.21 no.2
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    • pp.114-121
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    • 2013
  • High efficiency operation is required for motors of vehicle to increase fuel efficiency due to the regulation of exhaust gas. This paper presents a control method of fuel pressure to increase fuel efficiency and a sensorless control method of BLDC motor to get higher efficiency than conventional brushed DC motor. Initial rotor position of BLDC motor is detected from current value that is occurred by test voltage pulse and rotor is accelerated by defined sequence to enter sensorless operation mode. The algorithm to control flow rate of fuel pump uses PI controller that is control motor speed to maintain the target fuel pressure commanded by ECU.

Rotor Design to Improve Starting Performance of the Line-start Synchronous Reluctance Motor

  • Jung Tae-Uk;Nam Hyuk
    • Journal of Electrical Engineering and Technology
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    • v.1 no.3
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    • pp.320-326
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    • 2006
  • A single-phase line-start synchronous reluctance motor (LSSynRM) has merits of low cost, high efficiency and reliability. LSSynRM has an unbalanced magnetic circuit caused by flux barriers and various shapes of conductor bars when starting. Thus the motor may generate unstable starting torque in accordance with the initial starting position of the rotor. This paper presents the rotor design to improve starting performance of the LSSynRM. Design variables are the number and the shape of the conductor bars. This design result is compared with the initial prototype and single-phase induction motor.

Conduction Bar Design to Improve Starting Stability of Line Start Synchronous Reluctance Motor (직립 기동형 동기 릴럭턴스 전동기의 기동 안정성 개선을 위한 도체바 설계)

  • Nam, Hyuk;Hong, Jung-Pyo;Jung, Tae-Uk
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.55 no.3
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    • pp.131-137
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    • 2006
  • This paper deals with the conductor bar design to improve starting stability of line start synchronous reluctance motor(LSSynRM). As design variables, the number and the shape of conductor bars of rotor are chosen. The starting characteristics are calculated by finite element method(FEM) and the conductor bars are designed to improve the starting torque according to the initial starting rotor position. Finally, the starting characteristic of the designed model are compared with that of the initial model.

A Low Cost Position Sensing Method of Switched Reluctance Motor Using Reflective Type Optical-sensors (반사형 광센서를 이용한 저가형 SRM 위치검출기법)

  • Kim S.J.;Yoon Y.H.;Won C.Y.;Kim H.S.
    • The Transactions of the Korean Institute of Power Electronics
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    • v.10 no.2
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    • pp.148-154
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    • 2005
  • As the exciting point of each phase is determined by the position of rotor, the rotor's accurate position-information is needed for the Switched Reluctance Motor(SRM). When using an absolute-encoder or a resolver, to detect the location of rotor the initial starting is possible, as early sensing of rotor's location is possible. However, this is not appropriate, considering the economical efficiency, and in case of using the incremental-encoder, there's a problem at initial starting as it is not easy to track down the location of rotor at the very beginning. When using Hall-ICs, there's a fault, as it needs a special ring magnet. Considering the initial starting and economical efficiency, the optical sensor technique using a slotted-disk and an opto-interrupter is appropriate, however, this method needs three opto-interrupters and a slotted-disk when using the 6/4 pole SRM. Nevertheless, in this paper, it used only two optical sensors to operate 6/4 pole SRM and made the start up and also forward and reverse operation possible. By excluding the slotted-disc md shortening a optical sensor, it improved the convenience and economical efficiency of the production. Also, as the space for slotted-disc is no more needed, it was able to reduce the size of motor.

Design Modification of Airframe Shape for Ultra Light Quad-Rotor Development (초소형 쿼드로터 개발을 위한 기체형상 설계변경)

  • Park, Dae-Jin;Lee, Sangchul;Park, Saeng-Jin;Song, Tae-Hun
    • Journal of the Korean Society for Aviation and Aeronautics
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    • v.25 no.4
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    • pp.44-51
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    • 2017
  • An ultra light quad-rotor is utilized in various areas for military and commercial purpose. Especially, the airframe shape is designed with various airframe size, weight and purpose. In this paper, the initial airframe shape of the quad-rotor was designed and manufactured. Flight test was conducted for the quad-rotor. The design modification of airframe shape was conducted to meet design requirement. By changing design, weight of airframe structure was reduced and payloads were placed to the best position. By reinforcing ribs and reducing vehicle's legs, the durability of airframe structure was enhanced.

IPMSM Vector Control using an I/F Initial Operating Method for Drum Washing Machine (I/F 초기 기동 방법을 적용한 드럼세탁기용 IPMSM의 벡터제어)

  • Park, Jin-Ho;Lee, Jung-Hyo;Kim, Kyung-Min;Won, Chung-Yuen
    • Proceedings of the KIPE Conference
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    • 2009.11a
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    • pp.271-273
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    • 2009
  • Because few signals are generated using low resolution position sensor at low speed, rotor position estimation is difficult in drum washing machine application. Besides, inertia of water and drum affect the initial operation load up to two times of rated load. Therefore overcurrent can be occurred at initial operation. In this paper, IPMSM vector control for drum washing machine is proposed by applying I/F initial operating method and sensorless control. And we verify the performance through experiment.

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