• The Transactions of the Korean Institute of Power Electronics
• /
• v.2 no.2
• /
• pp.49-56
• /
• 1997

Switched Reluctance Motors(SRMs) have a considerable inherent torque ripple due to the driving characteristics of pulse current waveform and the nonlinear variation inductance profile. This paper describes a current shape characteristics to effect a torque ripple reduction, and one pulse mode switching control method is proposed to minimize torque ripple of a switched reluctance motor regardless of speed and load condition by regulating tow parameters, such as, advance angle and exciting voltage. The experiments are performed to verify the capability of proposed switching method on 6/4 salient type SRM.

• The Transactions of the Korean Institute of Electrical Engineers D
• /
• v.52 no.6
• /
• pp.333-341
• /
• 2003

In induction motor control systems driven by the indirect vector control scheme, the rotor speed is measured to determine the flux angle which is a key variable in the control algorithm. The most popular way to measure the angular velocity is the use of rotary encoder. Since the errorneous measurement of rotor speed results in incorrect flux angle estimate, the control input generated based on the faulty information should be far from the desired (correct) value and deteriorates the overall control performance. In this paper the effects of encoder fault on motor variables and control performance are analyzed by both theoretical approach and experimental study. A parity equation based on the Power is suggested and applied to detect the incipient fault of encoder.

• 제어로봇시스템학회:학술대회논문집
• /
• 2001.10a
• /
• pp.139.1-139
• /
• 2001

Nowadays due to the remarkable advance of power electronics and micro controller, a Brushless AC servomotor which has the characteristics of the high inertia to torque ratio, the high power density, the maintenance free, and so on is being used widely in industrial robots, machine tools, and factory automation. In a conventional DC motor, the polarity commutation is performed of itself by mechanical brush and commutator, but the PM synchronous motor requires an electrical commutation according to the rotor position. Then for the maximum torque production PM synchronous motor has to be equipped with a controller which maintains the optimal phase angle between the stator field and the magnetic field ...

• 제어로봇시스템학회:학술대회논문집
• /
• 2002.10a
• /
• pp.74.2-74
• /
• 2002

$\textbullet$ Roll Control $\textbullet$ Switched Reluctance Motor $\textbullet$ Field Programmable Gate Array $\textbullet$ Single Pulse Mode Current Control $\textbullet$ OR/Off Angle Control

• The Journal of the Korea institute of electronic communication sciences
• /
• v.14 no.5
• /
• pp.1009-1018
• /
• 2019

This paper describes the design and implementation of a rehabilitation medical device based on a EMG measurement. Rehabilitation systems are controlled using BLDC motors and motor drives. The BLDC motor drive controls the operation and the speed controls the drive through the external servo motor. In addition, potentiometer coupled to the outside of the motor transmits information about the position of the load being rotated by the motor. The rehabilitation algorithm is controlled by limiting the maximum angle of 0 to 120 by utilizing the motor according to the user setting stage during the rehabilitation exercise. The walking algorithm compensates motor control for the low leg of the signal using the difference value of the signal obtained with the surface denser attached to both inner muscles. The motor and surface denser are utilized for the walk motion to control the maximum angle of 0 to 80.

• Proceedings of the KIPE Conference
• /
• 1997.07a
• /
• pp.79-83
• /
• 1997

The inverter fed BLDC(Brushless DC) motor has been increasingly applied to industry and home appliances due to the advance of power electronics and permanent magnet technology, and its high efficiency and good acoustic noise characteristics. The BLDC motor and drives, however, require the rotor position sensors that may cause some problems such as the high cost and space. In this paper, sensorless algorithm for an interior permanent magnet BLDC motor is proposed. The maximum torque per ampere operation with advance angle considering load torque and speed was simulated and verified through the experiment.

• Journal of Institute of Control, Robotics and Systems
• /
• v.20 no.11
• /
• pp.1164-1169
• /
• 2014

This paper proposes an angle estimation of Segway robot for the slop driving. Most of Segway robot was controlled by pose control of keeping robot's balance and motor control of driving. In motor control, we analyzed Segway robot kinetically and estimated an angle of inclination using the velocity that depends on input force. In pose control, also, we used PD controller and evaluated a stability of controller through MATLAB simulation. Assuming the robot keeps its balance stably using controller, we could linearize dynamics. We could obtain the result through the experiment which estimates an angle using the velocity of Segway robot that is derived from linearized dynamics.

• Proceedings of the KIEE Conference
• /
• 1999.11b
• /
• pp.67-69
• /
• 1999

ADD is under development for the high speed motor. This paper describes the test results for obtaining the maximum output by leading angle of encoder. So we carried out the test for obtaining the optimum leading angle of encoder. Maximum output 80[Kw] at 20,000[rpm] was obtained at leading angle of encoder at near $22^{\circ}$. We confirmed the maximum output 106[kw] of 25,000[rpm] at leading angle of encoder at $34.6^{\circ}$.

• Proceedings of the KIEE Conference
• /
• 1999.07a
• /
• pp.64-66
• /
• 1999

Switched reluctance motor(SRM) has the advantages of simple structure, low rotor inertia and high efficiency. However, position sensor is essential in SRM in order to synchronize the phase excitation to the rotor position. The position sensors increase the cost of drive system and tend to reduce system reliability. This paper investigates the speed control of sensorless SRM in which the phase current and change rate are utilized in position decision, and the period of dwell angle is variable by compensating the rotor angle. The proposed system consists of position decision, phase locked loop controller, switching angle controller and inverter. The performances in the proposed system are verified through experiments.

• Proceedings of the KIEE Conference
• /
• 2000.07b
• /
• pp.750-753
• /
• 2000

ADD is under development for the high speed motor. This paper describes simulation and test results for obtaining the maximum output by leading angle of encoder. So we carried out the test for obtaining the optimum leading angle of encoder. Maximum output 80[kW] at 20,000[rpm] was obtained at leading angle of encoder at near $22^{\circ}$. We confirmed the maximum output 106[kW] of 25,000[rpm] at leading angle of encoder at $34.6^{\circ}$.