• Journal of international Conference on Electrical Machines and Systems
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• v.1 no.1
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• pp.84-90
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• 2012

Various methods have been proposed to identify the flux position in an interior permanent magnet synchronous motor (IPMSM) without the use of mechanical sensors. To achieve this, a method that uses both the back electromotive force (EMF) and the saliency to identify the flux position in the IPMSM without the injection of high-frequency components at low speeds has been reported. This method was then extended in order to drive the motor with no load to a light load. We propose a combination of these methods with different proportional-integral (PI) controllers for controlling $di_{dest}$/dt and $di_{qest}$/dt. We also introduce compensation values $F_L$ and $F_H$ to reduce the position error when the estimation rule is being selected.

• Journal of Electrical Engineering and Technology
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• v.13 no.1
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• pp.418-429
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• 2018

This paper studies the decentralized position/force control problem for constrained reconfigurable manipulator without torque sensing. A novel joint torque estimation scheme that exploits the existing structural elasticity of the manipulator joint with harmonic drive model is applied for each joint module. Based on the estimated joint torque and dynamic output feedback technique, a decentralized position/force control strategy is presented. In order to solve the problem of controller parameter perturbation, the non-fragile robust technique is introduced into the dynamic output feedback controller. Subsequently, the stability of the closed-loop system is proved using the Lyapunov theory and linear matrix inequality (LMI) technique. Finally, two 2-DOF constrained reconfigurable manipulators with different configurations are applied to verify the effectiveness of the proposed control scheme in numerical simulation.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2004.05a
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• pp.511-513
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• 2004

In a switched reluctance motor drive, it is important to synchronize the stator phase excitation with the rotor position, because the position of rotor is an essential information. In the high-speed region, switching angles are fluctuated back and forth out of the preset value, which is caused by the sampling period of the microprocessor. In this paper, a low cost analog encoder suitable for practical applications is proposed. The validity of the proposed analog encoder with a proper logic controller is verified from the experiments.

• Journal of Power Electronics
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• v.6 no.3
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• pp.264-270
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• 2006

Magnetic levitation transfer systems are useful for transfer tools in clean rooms and positioning control systems with high precision because of frictionless characteristics. In this paper, the new method is proposed which is a sensorless position. At first, the magnetic levitation is performed by state feedback control with a disturbance observer for each of six axes of the movement of a levitated vehicle. The position of the vehicle is then estimated as the disturbance term of a disturbance observer for a pitch angle which is one of the control axes for the magnetic levitation. In addition, the positioning force is generated by the pitch angle control which gives a tilt to the levitated vehicle so that it generates the horizontal component of force.

• Proceedings of the KIPE Conference
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• 2017.07a
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• pp.76-77
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• 2017

본 논문에서는 DC링크 전류센서를 가진 고주파 신호 주입 센서리스 드라이브에서 전류 예측을 이용한 전류 재구축 방법을 제안한다. DC링크 전류센서를 가진 드라이브에서 DC링크 전류로부터 재구축된 3상 전류는 재구축 오차를 포함하고 있다. 이 오차는 고주파 신호 주입 주파수가 높아질수록 커지며, 센서리스 성능을 저하시킨다. 본 논문은 전류 예측을 통하여 재구축 오차를 줄임으로써 센서리스 성능을 향상시켰다. 이는 실험을 통하여 제안한 방법의 유효성을 검증하였다.

• Proceedings of the KIPE Conference
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• 2007.07a
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• pp.7-9
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• 2007

If used to drive the minicar, the BLDC Motor has advantages of weightless, efficient, small-size and credibleness. In this paper at first the position detecting method for BLDC was introduced, secondly the simulation of control algorithm was done and at last the prototype controller based one chip processor MEGA48 was fabricated. The controller proposed has characteristic of cheap cost, reliable performance and totally meeting demands of minicar control.

• Proceedings of the KIPE Conference
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• 2001.07a
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• pp.650-653
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• 2001

In recent the energy efficiency of a refrigerator has been restricted extremely. A compressor consumes a great portion of input power in a refrigerator. So it is necessary to develop a more efficient compressor in these days. The existing reciprocating compressor need to a crank shaft to convert the rotating motion to the straight motion and is not efficient. But the linear compressor using mechanic resonance is efficient but need a drive instead of a crank shaft to control a position accurately. However it is impossible to apply a stroke sensor practically because of the internal circumstance of compressor. In this paper, A new sensorless stroke control method using the current and voltage of linear compressor is proposed.

• Journal of Electrical Engineering and Technology
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• v.9 no.2
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• pp.600-608
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• 2014

This paper presents estimation of d-axis and q-axis inductance of an interior permanent magnet synchronous motor (IPMSM) by using an extended Kalman filter (EKF). The EKF is widely used for control applications including the motor sensorless control and parameter estimation. The motor parameters can be changed by temperature and air-gap flux. In particular, the variation of the inductance affects torque characteristics like the maximum torque per ampere (MTPA) control. Therefore, by estimating the parameters, it is possible to improve the torque characteristics of the motor. The performance of the proposed estimator is verified by simulations and experimental results based on an 11kW PMSM drive system.

• Proceedings of the KIPE Conference
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• 2015.07a
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• pp.205-206
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• 2015

본 논문에서는 단일 전류 센서를 가진 IPMSM 구동 시스템의 고주파 신호 주입 센서리스 제어를 제안한다. 단일 전류 센서 시스템에서 3상 전류를 재구축하기 위해 DC link 전류를 검출한다. DC link 전류를 이용하여 3상 전류를 재구축하는 경우의 문제점은 1개 또는 2개의 유효벡터가 DC link 전류를 검출하는데 필요한 최소 시간보다 짧게 인가될 때 발생한다. 센서리스 제어시 이러한 경우가 발생하면, 재구축된 전류의 왜곡에 의해 제어 성능이 저하된다. 본 논문은 전압 벡터가 작은 경우, 전류 예측을 통하여 신뢰할 만한 3상 전류를 재구축하여 전류의 왜곡을 줄임으로써 센서리스 제어 성능을 향상시켰다. 시뮬레이션을 통하여 제안한 기법의 타당성을 검증하였다.

• Proceedings of the KIPE Conference
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• 2018.11a
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• pp.12-14
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• 2018

본 논문은 영구자석 동기전동기(PMSM) 센서리스 구동 시스템의 구동 재개 방법을 제안한다. PMSM의 센서리스 구동 시스템에서는 일반적으로 전동기의 역기전력을 기반으로 회전자의 속도와 위치를 추정한다. 하지만 PMSM이 회전 중인 상태에서 인버터의 동작이 중단된 경우에 구동을 재개하기 위해서는 회전자의 초기 속도 및 위치 정보가 필요하다. 따라서 본 논문에서는 인버터의 영전압 벡터를 인가하여 발생된 전류를 이용해 회전자의 초기 속도 및 위치 정보를 추정하는 PMSM 센서리스 구동 시스템의 구동 재개 방법을 제안한다. 제안하는 방법의 타당성은 시뮬레이션을 통해 검증한다.