This work describes a method to characterize a three-phase linear induction motor in order to determine the various parameters used in its per-phase equivalent circuit by a DSP-based electric-drives system. In LIM (Linear Induction... more
This work describes a method to characterize a three-phase linear induction motor in order to determine the various parameters used in its per-phase equivalent circuit by a DSP-based electric-drives system. In LIM (Linear Induction Motor), the air gap is very large compared with the RIMs (Rotary Induction Motors). Further, the secondary part normally does not have slotted structure. It is just made of aluminum and steel plates. Therefore, the effective air gap is larger than the physical air gap. High air gap makes a larger leakage inductance. It leads to lower efficiency and lower power factor (Kang et al., 2003). DC resistance test will be done to determine the value of Rs. The primary Inductance Ls will be calculated by running the LIM at synchronous speed. The secondary parameters i.e. L lr and R r will be calculated by blocked-mover test. The experiment for no load test is shown and include a DC motor coupled to the LIM under test. Two methods to calculate the secondary paramet...
This paper presents a direct torque control for a Single-sided Linear Induction Motor (SLIM). In the last years, in the field of research on linear induction drives, a lot of efforts have been oriented to improve the dynamics performances... more
This paper presents a direct torque control for a Single-sided Linear Induction Motor (SLIM). In the last years, in the field of research on linear induction drives, a lot of efforts have been oriented to improve the dynamics performances of these machines by using direct torque control. In order to insure a high transient behavior of the drive and to avoid the draw back of the parametric perturbations in the implemented control, the direct torque control is considered in this work.
The main goal in this paper is to present a linear induction motor parameter determination method when its destination is mainly the thrust development. This method is developed basically from the equivalence between the linear induction... more
The main goal in this paper is to present a linear induction motor parameter determination method when its destination is mainly the thrust development. This method is developed basically from the equivalence between the linear induction motor (LIM) and the ordinary asymmetrical induction motor. In this case the theory of symmetrical and asymmetrical components or positive, negative and zero sequence is used. Experimental procedures with the LIM prototype can support the theoretical and experimental validation for this method
The intermodal MAGLEV concept Autoshuttle is subject of reference (Steingröver & Krevet, 2002). The present paper highlights updates of the levitation, propulsion and control systems and outlines a Brazilian case study.
In this work, a sensorless control scheme is presented for linear induction motors. The secondary fluxes are algebraically calculated by first determining the primary fluxes, then, a super-twisitng observer for secondary fluxes is... more
In this work, a sensorless control scheme is presented for linear induction motors. The secondary fluxes are algebraically calculated by first determining the primary fluxes, then, a super-twisitng observer for secondary fluxes is designed in order to retrieve the back-EMF components by means of the equivalent control method. Based on these components, the linear velocity is determined and used in a linear velocity and load force observer, where the estimated variables along with primary current and voltage measurements are used to ...
ABSTRACT This paper presents a discrete-time inverse optimal control for trajectory tracking applied to a three-phase linear induction motor (LIM). An on-line neural identifier, which uses a recurrent high-order neural network (RHONN)... more
ABSTRACT This paper presents a discrete-time inverse optimal control for trajectory tracking applied to a three-phase linear induction motor (LIM). An on-line neural identifier, which uses a recurrent high-order neural network (RHONN) trained with the Extended Kalman Filter (EKF), is employed in order to build a mathematical model for the nonlinear system. This model is in the Nonlinear Block Controller (NBC) form. The control law calculates the input voltage signals, which are inverse optimal in the sense that they minimize a cost functional without solving the Hamilton Jacobi Bellman (HJB) equation. The applicability of the proposed control scheme is illustrated via simulation.
This paper describes the constructive form of a linear induction motor applied to the traction of MagLev-Cobra levitation vehicle and the required control to a secure and economic driving. Moreover, issues about linear induction motor... more
This paper describes the constructive form of a linear induction motor applied to the traction of MagLev-Cobra levitation vehicle and the required control to a secure and economic driving. Moreover, issues about linear induction motor intrinsic features, such as traction force and current, are presented. Keywords – Linear Induction Motor (LIM), LIM features, V/f driver, bidirectional power converter.
