A simple and robust digital current control technique of a PM synchronous motor using time delay control approach

2001 ◽  
Vol 16 (1) ◽  
pp. 72-82 ◽  
Author(s):  
Kyeong-Hwa Kim ◽  
Myung-Joong Youn
Keyword(s):  
Time Delay ◽  
Synchronous Motor ◽  
Current Control ◽  
Control Technique ◽  
Control Approach ◽  
Time Delay Control ◽  
Delay Control ◽  
Pm Synchronous Motor

Three Degrees of Freedom Active Control of Pneumatic Vibration Isolation Table by Pneumatic and Time Delay Control Technique

2010 ◽  
Vol 132 (5) ◽  
Author(s):  
Yun-Ho Shin ◽  
Kwang-Joon Kim ◽  
Pyung-Hoon Chang ◽  
Dong Ki Han
Keyword(s):  
Time Delay ◽  
Active Control ◽  
Vibration Isolation ◽  
Decomposition Analysis ◽  
Second Order ◽  
Pneumatic Actuator ◽  
Control Technique ◽  
Order System ◽  
Time Delay Control ◽  
Delay Control

Based on previous feasibility study on one degree of freedom (1DOF) pneumatic active control of pneumatic springs, this paper presents procedures and results of a more realistic 3DOF active control of a pneumatic vibration isolation table. The 3DOF motion of the pneumatic table, consisting of heaving, rolling, and pitching, is controlled directly by adjusting air pressure in four pneumatic cylinders in a dynamic manner with pneumatic valves, without any external actuator such as an electromagnet or voice coil. The time delay control, which is a software chosen in this study, together with the hardware, i.e., the pneumatic actuator, is shown to be very powerful in enhancing the performance of vibration isolation for ground excitation as well as in settling time reduction for payload excitation through simulations and measurements on the 3DOF motion control system. New key results found in the experimental approach are that the pneumatic actuator shows a dynamic behavior of a second-order system, instead of a first-order system, which has been used in existing literatures so far, and that just feed-forward control of the pneumatic actuator by the second-order model can compensate for the inherently slow response characteristics of the pneumatic actuator very successfully. Effectiveness of the proposed active pneumatic control technique in the multi-input and multi-output system is shown via singular value decomposition analysis on the transmissibility matrix. Promising future of the proposed control and performance analysis technique is further discussed based on the results in the case of payload excitations as well.

Input/Output Linearization Using Time Delay Control

1992 ◽  
Vol 114 (1) ◽  
pp. 10-19 ◽  
Author(s):  
K. Youcef-Toumi ◽  
S.-T. Wu
Keyword(s):  
Time Delay ◽  
Simple Algorithm ◽  
Current Control ◽  
Control Procedure ◽  
Input Output ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Time Delay Control ◽  
Delay Control ◽  
Input Output Linearization

A control procedure that uses Time Delay Control to achieve input/output linearization of a class of nonlinear systems is presented. The control system is characterized by a simple algorithm and enhanced robustness properties in comparison with current control algorithms. The paper first reviews the fundamentals of input/output linearization. The use of Time Delay Control is then shown to result in an exact linear system for sufficiently small delay time. Modified controllers for systems with a low-pass filter are also investigated. Simulation results show that the algorithm works well with measurement noise. The controller is also tested on a single-link flexible arm to show the effectiveness of the simple algorithm in the control of complicated systems.

Constant time‐delay control technique for switching dc–dc converters

2016 ◽  
Vol 52 (13) ◽  
pp. 1160-1162 ◽  
Author(s):  
Jinping Wang ◽  
Liangkui Hou ◽  
Bo‐Cheng Bao ◽  
Yigang He
Keyword(s):  
Time Delay ◽  
Constant Time Delay ◽  
Constant Time ◽  
Control Technique ◽  
Time Delay Control ◽  
Delay Control

A Reduced Order Time-Delay Control for Highly Simplified Brushless DC Motor

1999 ◽  
Vol 121 (3) ◽  
pp. 556-560 ◽  
Author(s):  
Pyung H. Chang ◽  
Suk-Ho Park ◽  
Jung-Hoon Lee
Keyword(s):  
Time Delay ◽  
Position Control ◽  
Dc Motor ◽  
Current Control ◽  
Design Stage ◽  
Brushless Dc Motor ◽  
Reduced Order ◽  
Time Delay Control ◽  
Brushless Dc ◽  
Delay Control

A reduced order time-delay control is derived and applied to the position control of a brushless DC motor with a highly simplified hardware configuration: use of six-step commutation without current control unit. In addition, the closed-loop stability has been analyzed by using the singular perturbation method. Throughout experimental studies, it is observed that reduced order time delay control effectively compensates for parameter variations and non-linearities, which a conventional PID control cannot handle with adequate performances. This result shows that reduced order time-delay control enables an economical design without compromising performance. More importantly, the example establishes a case that: a good control method can compensate for the hardware deficiency in a given plant, and as a result it even enables a simpler design of plants at the design stage.

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