Linear Motor Control System Research Articles

A novel two-degree-of-freedom controller design for a permanent magnet linear synchronous motor control system

This paper proposes a novel two-degree-of-freedom optimal controller design for a permanent magnet linear synchronous motor position-control system. The param-eters of the controller are obtained by using a frequency-domain optimization technique. A systematic design of the controller and the detailed implementation of the proposed system are discussed. The closed-loop control system possesses good transient responses and good load disturbance responses. In addition, the system has a good tracking ability. Several experimental results are provided to validate the theoretical analysis.

A novel two-degree-of-freedom controller design for a permanent magnet linear synchronous motor control system

This paper proposes a novel two-degree-of-freedom optimal controller design for a permanent magnet linear synchronous motor position-control system. The parameters of the controller are obtained by using a frequency-domain optimization technique. The systematic design of the controller and the detailed implementation of the proposed system are discussed. The closed-loop control system exhibits good transient responses and good load disturbance responses. In addition, the system has a good tracking ability. Several experimental results are provided to validate the theoretical analysis.

Linear servo motor control using adaptive neural networks

A novel approach for designing and realizing a wavelet basis function network learning controller for a linear motor control system is considered. A new condition ensuring stability robustness of a closed-loop system including a neuro controller is derived. The proposed controller deals mainly with non-linear disturbances, especially viscous friction and force ripples that occur in motion control of linear synchronous motors. It consists of two parts: the feedback controller is designed on the basis of a simple linear model, and the learning feedback component is a wavelet neuro controller. A real-time simulation scheme on a recently developed high speed, multiple input-output, digital signal processing control board is constructed to realize and evaluate the proposed design. Mathematical and real-time simulations and an experimental study are performed to validate the proposed approach.

Investigation of superconducting linear synchronous motor propulsion control via an exact mathematical model

This paper describes the performance of the superconducting linear synchronous motor control system used for a transportation vehicle by using an exact dq0-axis mathematical model. The paper first shows the detailed block diagram of the speed control system, which includes the blocks of propulsion force and speed emf computations. A detailed discussion is devoted to the design of the control system. A cascade control system with PI controllers is designed as a numerical demonstration. It is also pointed out that the cascade control structure is a natural form for the power feeding method with three inverters. Performance simulations are shown for severe track conditions such as tunnel and track gradients as well as in a normal case. It is demonstrated that integrator windup of the speed controller can occur in the case of a severe condition in which one of the inverters is disabled. We present a design with more robustly stable performance by designing an antiwindup controller. © 1999 Scripta Technica, Electr Eng Jpn, 128(2): 45–52, 1999

Investigation of Superconducting Linear Synchronous Motor Propulsion Control via an Exact Mathematical Model

This paper describes the performance of the superconducting linear synchronous motor control system used for a transportation vehicle by using an exact dqO-axis mathematical model. The paper firstly shows the detailed block diagram of the speed control system, which includes the blocks of propulsion force and speed emf computations. A detailed discussion is given to the design of the control system. A cascade control system with PI controllers is designed as a numerical demonstration. It is also pointed out that the cascade control structure is a natural form for the power feeding method with three inverters. Performance simulations are shown for severe track conditions like tunnel and track gradient as well as a normal case. It is demonstrated that an integrator windup of the speed controller can occur in the case of a severe condition that one of the inverters is disabled. We show a design with more robustly stable performance by designing an anti-windup controller.

Linear Drive Systems and their Related Technologies. Improvement of Performamce of a Linear Pulse Servo Motor Control System using Two Degrees of Freedom Controller.

By use of pole position sensor, it becomes possible to drive a linear pulse motor as a servo motor and to reduce the risk of step-out exceedingly.However a linear pulse motor remains the vibrational characteristics itself. Therefore, there is the problem of how to suppress the over shoot and transient vibration of response for step type position reference. In addition, this problem stands out remarkably in heavy load operation.In this paper, we propose a novel method of adjusting the parameters of two degrees of freedom controller which is positively able to take into consideration the suppression of vibrational characteristics of a linear pulse motor. By comparison with conventional PID controller, the improvement of performance of a linear pulse servo motor control system using two degrees of freedom controller are discussed.With the experimental and simulation results, it was made clear that the introduction of two degrees of freedom controller designed by the proposed method not only improves the over shoot and transient vibration of response for step type position reference, but also removes the undesirable characteristic variation by altering the value of load mass in the linear pulse servo motor control system.

A linear induction motor control system for magnetically levitated carrier system

An electromagnetic suspension system has been developed that cuts off electric power-collecting devices from a magnetically levitated vehicle. This system makes it possible to transport materials with no mechanical contact at all between the vehicle and ground facilities. A control system for linear induction motors used in the magnetically levitated carrier system is described. The system was developed to transport materials in an environment which must be kept free from even microscopic dust motes and trivial noise. The linear induction motor control method used for positioning a vehicle at the station is described along with several kinds of switches without any mechanical motion in the ground facilities. A supervisory control system for the magnetically levitated carrier system is also discussed. >