2002 Fiscal Year Final Research Report Summary
Research on Robust Adaptive Control of AC servomotors via Spiral Vector
| Project/Area Number |
13650493
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Control engineering
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| Research Institution | Oita University |
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Principal Investigator |
SUEMITSU Haruo Oita University, Dept. of Human Welfare Engineering, Research Associate, 工学部, 助手 (50162839)
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| Co-Investigator(Kenkyū-buntansha) |
MATSUO Takami Oita University, Dept. of Human Welfare Engineering, Associate Professor, 工学部, 助教授 (90181700)
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| Project Period (FY) |
2001 – 2002
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| Keywords | Adaptive control / Spiral vector / Field-oriented control / Overshoot / Riccati equation / Induction motor / DC motor / Imaginary-axis shifting |
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| Research Abstract |
Brushless DC motors have been widely used because of their attractive features - compactness, low weight, high efficiency, and easiness in control. The EMF of a brushless DC motor is a nonlinear function of the rotor position and speed. The speed/position control of AC servomotors is well known applications of nonlinear adaptive control theory. Though the control technique is generally adopted for speed and/or torque control application, AC motor drives are only slightly diffused in position control application. In this research, we try to improve the transient performance of the adaptive control system based on a Riccati equation. Yamamura proposed the spiral vector method to derive analytical solutions of electromagnetic transients of AC machines by introducing a new idea of damped inductance. We compare the spiral vector with the imaginary axis shifting in the control theory. Moreover, we present an adaptive control system with a spiral vector to improve the transient response in the position control system of induction motors and brushless DC (BLDC). An adaptive controller is designed based on the motor dynamics approximated by a second-order mechanical equation same as DC motors. We consider the relationship between the spiral vector method in the motor transient analysis and the imaginary axis shifting in the control theory. The adaptive controller with the imaginary axis shifting is presented based on the output feedback and designed for the position control of induction motors and brushless DC servomotor. The simulation results showed that the switching the spiral vector factor is available to reduce the overshoot magnitude of the closed loop system in the transient period.
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