(A) study on auto-tuning PI/PI-PD controllers applied to servomotor drives = 서보 전동기 구동을 위한 PI/PI-PD 제어기의 이득 자동조정에 관한 연구

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This thesis shows auto-tuning of simple regulators that are used for servomotor speed and position control, respectively. Servomotors can be divided into two categories such as DC servomotors and AC servomotors. Among them, DC servomotors are traditionally used for the variable speed and position drives. Though AC motors provided increased power density and ruggedness, their native coupling and nonlinearity have been tackled accurate motion control. Recently, vector current control scheme and advanced microprocessor technologies drastically refined torque control performance of AC motors such as the separately excited DC motors. As a result, AC servomotors such as PM synchronous motors are gradually replacing DC servomotors in motion control applications. Torque is the basic control variable of a motor because it is directly depends on driving current. With an inertial load, electromagnetic torque of a motor is related to the angular acceleration. Since the angular speed and the angle is also related to the angular acceleration through integral and double integral respectively, current control dynamics for the electromagnetic torque regulation is the primary dynamics of motor control. In general, the dynamics of current control could be handled much faster than the mechanical dynamics. Therefore a speed or position controller could be designed for the mechanical dynamics where the electrical dynamics is assumed to be ideal. Minimum requirements of speed and position control structures could be explained as follows. For a constant inertial load, a servomotor under speed control is modeled as a first order plus dead time (FOPDT) process with small dead time. As many theoretical researchers agree, a PI controller is enough for this case. For the position control applications, motor is modeled as a second order integrating process because the angular position is represented as the time integration of angular acceleration. Obviously, a simple PID controller does no...
Advisors
Youn, Myung-Joongresearcher윤명중researcher
Description
한국과학기술원 : 전기및전자공학전공,
Publisher
한국과학기술원
Issue Date
2003
Identifier
231114/325007  / 000975024
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 전기및전자공학전공, 2003.8, [ v, 110 p. ]

Keywords

relay autotuner; servomotor control; PID position control; PI speed control; servomotor drive; 전동기 강인제어; 서보전동기 구동; 릴레이 궤환제어; 자동 이득조정; 영구자석 동기전동기

URI
http://hdl.handle.net/10203/35164
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=231114&flag=dissertation
Appears in Collection
EE-Theses_Ph.D.(박사논문)
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