• Title/Summary/Keyword: high speed motor

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A Simple Negative Torque Compensation Scheme for a High Speed Switched Reluctance Motor

  • Lee, Dong-Hee;Ahn, So-Yeon;Ahn, Jin-Woo
    • Journal of Power Electronics
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    • v.12 no.1
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    • pp.58-66
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    • 2012
  • SRMs(Switched Reluctance Motors) are much interested in high speed applications due to the mechanical robustness, simple structure and high efficiency. In spite of many advantages of SRMs, a higher torque ripple discourages the adoption of SRMs in a high speed application. This paper presents a simple negative torque of tail current compensation scheme using a modified TSF(Torque Sharing Function) for the high speed SRMs. Because of the short commutation in the high speed region, the negative torque from the tail current makes the high torque ripple. In order to reduce and compensate the negative torque from tail current, the proposed control scheme produces an additional compensating torque with a reference torque in the active phase winding. And the compensating value is dependent on the tail current of the inactive phase winding. Furthermore, the switching signals of the outgoing phase are fully turned off to restrict the extended tail current, and the torque error of the outgoing phase is compensated by the incoming phase. The proposed modified TSF control scheme is verified by the computer simulations with 30,000[rpm] high speed 4/2 SRM. The simulation and experimental results show the effectiveness of the proposed control scheme.

Detection of Rotating Speed of Induction Motor Using the Rotor Slot Harmonic (회전자 슬롯 고조파를 이용한 유도전동기의 회전속도 검출)

  • Yang, Chul-Oh;Lee, Gyeong-Seok;Lee, Dae-Sung;Parkk, Kyu-Nam;Song, Myung-Hyun
    • Proceedings of the KIEE Conference
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    • 2011.07a
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    • pp.2077-2078
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    • 2011
  • Now a days, the induction motor is widely used in industry automation. Without monitoring the motor fault, maintenance cost is increased undesirably high. The slip frequency is included in the feature frequency, so rotating rotor speed is needed. In this paper, a sensorless motor speed estimation method, rotor slot harmonic(RSH) method is suggested and a solution of rotor bar diagnosis is proposed for motor running with light-load. When the rotor is rotating, it shows the harmonic signal of back-emf voltage related with number of rotor slot. So from the power spectrum of current signal, we can find the rotor speed.

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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.

Speed Control of High Speed Miniature BLDCM Based on Software PLL (소프트웨어 PLL 기반 소형 고속 BLDCM의 속도 제어)

  • Lee, Bong-Hee
    • The Transactions of the Korean Institute of Power Electronics
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    • v.14 no.2
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    • pp.112-119
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    • 2009
  • This paper presents a PLL(Phase Lock Loop) approach for effective speed and torque control of high speed miniature BLDCM(Brushless DC Motor) using hall sensor. The proposed speed control method based on PLL uses only a phase shift between reference pulse signal according to speed reference and actual pulse signal from hall sensor. It doesn't use any speed calculation, and calculates a direct current reference from phase shift. The current reference is changed to reduce the phase shift between reference and actual pulse. So the actual speed can keep the reference speed. The proposed control scheme is very simple but effective speed control is possible. In order to obtain a smooth torque production, the reference current is changed using acceleration and deceleration slope. The proposed control scheme is verified by experimental results of the 50W, 40,000[rpm] high speed miniature BLDCM.

A Novel High-Performance Strategy for A Sensorless AC Motor Drive

  • Lee, Dong-Hee;Kwon, Young-Ahn
    • KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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    • v.2B no.3
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    • pp.81-89
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    • 2002
  • The sensorless AC motor drive is a popular topic of study due to the cost and reliability of speed and position sensors. Most sensorless algorithms are based on the mathematical modeling of motors including electrical variables such as phase current and voltage. Therefore, the accuracy of such variables largely affects the performance of the sensorless AC motor drive. However, the output voltage of the SVPWM-VSI, which is widely used in sensorless AC motor drives, has considerable errors. In particular, the SVPWM-VSI is error-prone in the low speed range because the constant DC link voltage causes poor resolution in a low output voltage command and the output voltage is distorted due to dead time and voltage drop. This paper investigates a novel high-performance strategy for overcoming these problems in a sensorless ac motor drive. In this paper, a variation of the DC link voltage and a direct compensation for dead time and voltage drop are proposed. The variable DC link voltage leads to an improved resolution of the inverter output voltage, especially in the motor's low speed range. The direct compensation for dead time and voltage drop directly calculates the duration of the switching voltage vector without the modification of the reference voltage and needs no additional circuits. In addition, the proposed strategy reduces a current ripple, which deteriorates the accuracy of a monitored current and causes torque ripple and additional loss. Simulation and experimentation have been performed to verify the proposed strategy.

Speed Control of Induction Motor Drive for FCU Using TMS320LF2406 DSP controller (TMS320LF2406 DSP를 이용한 FCU용 유도 전동기 속도제어)

  • Choi Woo-Suk;Kim Lee-Hun;Park Kyu-Hyun;Won Chung-Yuen;Lee Sang-Suk;Choi Chang-Young
    • Proceedings of the KIPE Conference
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    • 2001.12a
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    • pp.3-6
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    • 2001
  • This paper designs a drive for high efficiency of the 3-phase IM (induction motor) for FCU(Fan Coil Unit). The speed control system of 3-phase IM for FCU has been implemented by a TMS320LF2406 DSP chip. The DSP TMS320LF2406, which include the most peripheral circuit for control of the Industrial motor suitable for AC motor drive. This type of the controller can be obtained low cost and high reliance. The proposed drive system of the 3-phase IM for the FCU is verified by simulation. The results show the speed control characteristics of the control strategy Proposed for 3-Phase IM drive.

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A Study on Ripple Reduction of BLDC Motor using TMS320F240 (TMS320F240을 이용한 BLDC 전동기의 리플저감에 대한 연구)

  • Roh, Kwang-Ho;Kim, Yong;Lee, Seung-Il;Cho, Gyu-Man;Lee, Kyu-Hun
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2000.11a
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    • pp.219-224
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    • 2000
  • This paper presents a ripple reduction of BLDC motor using TMS320F240. A fault of permanent magnet(PM) BLDC motor possible to miniaturization and high-output is to be difficult to reduce speed-ripple at low speed region. An existing solution is to be use of PWM waveform by PI control with computing control angle of 60$^{\circ}$. The new family of DSP controllers provides a single chip solution by integrating on-chip not only a high computational power but also, all the peripherals necessary for electric motor control. This paper gives an advanced solution of the SVPWM technique for the purpose of reducing control angel rather than 60$^{\circ}$. This technique gives an excellent speed ripple characteristic.

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Current Control of DC Motor using Software Bang-Bang Algorithm (Software Bang-Bang Algorithm을 이용한 DC Motor 전류제어)

  • Bae, Jong-Il;Jung, Dong-Ho
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.2 no.4
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    • pp.88-94
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    • 2003
  • The DC motor has the strong characteristics in the speed response, the system parameter variations and the external influence and is used as the speed controller with its good starting torque in the distributing industry. However development of the Microprocessor which is for high speed switching program can make better control system. This paper introduce to design of the high-effective DC motor controller that is using Software Bang-Bang Program of Fuzzy algorithm and to verity a PI controller and a Fuzzy controller.

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Application of Linear Motor for the High-Speed Feed System of Machine Tools (초고속 이송 장치로서 리니어 모터의 적용 연구)

  • 신흥철;최종률
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1996.11a
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    • pp.621-625
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    • 1996
  • The feed system of the machine tools is limited by the mechanical transmission elements. However, thanks to the advanced modern technology, those machines are able to equip with linear motors. In this paper, the types and application aspects of linear motor are discussed and a synchronous type of the linear motors has been applied to X-Y table for machining center. The performance shows an outstanding result in terms of the accuracy, speed and stiffness. Machine tool system with linear motors is expected to be more productive machines using linear motor in the near next years.

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