• IEMEK Journal of Embedded Systems and Applications
• /
• v.18 no.5
• /
• pp.209-215
• /
• 2023

This study proposes an AC servo motor control program structure and its implementation method to efficiently integrate 13 types of additional compensation algorithms into the basic FOC (field-oriented control) algorithm program. Various compensation algorithms are necessary to enhance the stability and performance of machine tools by compensating for interference from disturbances and vibrations. Each compensation algorithm is implemented as a separate, independent function and called from a switch-case statement in the ISR (interrupt service routine) of the PWM (pulse-width modulation) device. The advantages of this approach include facilitating not only debugging and testing but also reducing the possibility of errors during the program development phase. Thus, it is easy to add and activate each specific compensation algorithm for the program update during the program operation phase. The implemented motor control program was experimented with a single-axis feed shaft testbed driven by a commercial AC servo motor control drive board and a 750 Watts SPMSM (surface-mounted permanent magnet synchronous motor), and the results verified its normal operation and performance improvement.

• Proceedings of the KIEE Conference
• /
• 2008.04c
• /
• pp.62-64
• /
• 2008

본 논문은 에너지 절감차원에서 단상 유도 동기전동기의 효율을 개선하는 설계를 수행하였다. 회전자에 삽입되는 영구자석의 길이와 위치의 결정, 운전 시고효율과 원활한 기동을 위한 운전 및 기동 커패시터의 값의 산정을 통하여 설계를 수행하였으며 이를 시작품 제작하여 실험으로서 설계의 타당성을 검증하였다.

• Journal of Electrical Engineering and Technology
• /
• v.6 no.6
• /
• pp.793-798
• /
• 2011

Numerous methods are available for reducing the end-effect force of linear machines. Majority of these methods focus on redesigning the poles or slots. However, these methods require additional manufacturing cost and decrease the power density. The current paper introduces another approach to reduce the end-effect force. The new approach is a method of tuning the input phase current magnitudes individually. According to the proposed method, reduction of the end-effect force could be achieved without redesigning the poles/slots or attaching auxiliary poles/slots. The proposed method is especially applicable when the target motor is very expensive or will be used for a special mission, such as hauling army vehicles equipped with three single-phase inverters. The validity of the suggested method was exemplified by the finite element method with three-phase permanent-magnet linear synchronous motor.

• The Transactions of the Korean Institute of Power Electronics
• /
• v.27 no.1
• /
• pp.80-83
• /
• 2022

This paper proposes an initial rotor polarity detection algorithm of a single-phase permanent magnet synchronous motor (SP-PMSM) related to stable open-loop starting for sensorless operation. Generally, the SP-PMSM needs an asymmetric air-gap structure to can avoid the initial starting failure at zero torque point. Therefore, the rotor polarity information can be obtained by using the DC offset current direction of a stator current through a high frequency voltage injection into an SP-PMSM with an asymmetric air gap. In this paper, the proposed rotor initial polarity detection algorithm is verified through several experimental results.

• The Journal of the Institute of Internet, Broadcasting and Communication
• /
• v.21 no.1
• /
• pp.115-120
• /
• 2021

In this paper, an operating algorithm for single-phase permanent magnet synchronous motor based on PR current controller is proposed. In general, an asymmetric gap may occur depending on the shape of the rotor of single-phase PMSM, and this causes noise and vibration during high-speed operation. Therefore, in this paper, an operating algorithm for a single-phase PMSM usihng a proportional resonant current conrtoller with excellent control stability was proposed. Proportional resonant current controller has on steady state error is relatevly robust against distortion. Also, steady state error of AC input can be eleminated without complicated calculation process. The validity and availability of the proposed algorithm are verified through the experiment.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• v.19 no.5
• /
• pp.54-59
• /
• 2005

Brushless DC motor is a motor which is modified form DC brush motor and it does not have brushes. BLDCM is easy to centre, has wide speed range, high efficiency. However it needs speed sensor like encoder which increases the motor price and cause some faults in poor surroundings.. In this paper, for the sensorless control, the driving techniques for the initial stable start and the steady state are studied For the steady state the rotor position is determined using the measured back-EMF. To enhance the initial stating performance, the current signal from the free-wheeling diode is used. The results are conformed through the experiments.

• The Transactions of the Korean Institute of Power Electronics
• /
• v.5 no.6
• /
• pp.610-619
• /
• 2000

This paper presents an off-line UPS using the high temperature superconductive magnetic bearing. FES(Flywheel Energy Storage) system has good advantages in compare with lead acid battery. So, high efficiency FES using high temperature SMB(superconductive magnetic bearing) was composed in this paper. The outer rotor type of PMSM(Permanent Magnet Synchronous Motor) as motor/generator was used for the experiment, and square wave current and sinusoidal wave control methods was compared for high efficiency operation of motor/generator. The circuit for in phase sinusoidal wave current control with EMF in the full speed range was designed and the proposed flywheel energy storage system was applied in single phase off-line UPS system. As the stable operation characteristics of prototype system was confirmed, the its excellence as energy storage device in Off-line UPS was proved.

• ETRI Journal
• /
• v.37 no.6
• /
• pp.1154-1164
• /
• 2015

This paper proposes a fully sensorless driver for a permanent magnet synchronous motor (PMSM) integrated with a digital motor controller and an analog pre-driver, including sensing circuits and estimators. In the motor controller, a position estimator estimates the back electromotive force and rotor position using a sliding-mode observer. In the pre-driver, drivers for the power devices are designed with a level shifter and isolation technique. In addition, a current sensing circuit measures a three-phase current. All of these circuits are integrated in a single chip such that the driver achieves control of the speed with high accuracy. Using an IC fabricated using a $0.18{\mu}m$ BCDMOS process, the performance was verified experimentally. The driver showed stable operation in spite of the variation in speed and load, a similar efficiency near 1% compared to a commercial driver, a low speed error of about 0.1%, and therefore good performance for the PMSM drive.

• Proceedings of the KIEE Conference
• /
• 2009.04b
• /
• pp.67-69
• /
• 2009

본 논문에서는 자성재료의 비선형성을 고려한 단상 직입 영구자석형(LSPM) 동기전동기의 기동특성해석을 다룬다. 전동기의 운전상태에 따른 자성재료의 비선형특성을 고려하기 위해 정자장 유한요소법을 이용하여 d축과 q축에 대해 전류변화에 따른 인덕턴스를 추출하였다. 계산된 인덕턴스를 LSPM의 등가회로에 적용하였으며 Runge-Kutta 법을 이용하여 시간차분해석을 수행하였다. 제시된 해석방법으로 계산된 기동특성과 유한요소해석결과를 비교함으로써 비선형의 영향을 고찰 하였다.

• Proceedings of the KIPE Conference
• /
• 2019.07a
• /
• pp.410-411
• /
• 2019

본 논문에서는 홀 센서를 사용하지 않고 단상 영구자석 동기 전동기의 초기 회전자 자극을 검출하여 안정적인 오픈루프 기동 및 센서리스 운전 기법을 제안한다. 제안한 회전자 초기 자극 검출 방법은 비대칭 공극을 갖는 단상 영구자석 동기 전동기에 고주파 전압을 인가한 후 회전자 초기 극성에 따른 자기회로의 비 포화 및 포화여부를 저역통과필터를 이용하여 빠르게 검출하는 방법을 제안하였다. 제안된 초기 자극 검출 방법은 다수의 실험 결과를 통해 안정적 기동 및 센서리스 운전이 가능함을 입증하였다.