Dynamic Model Based Vector Control of Linear Induction Motor

Abstract

Induction machines (IM) have been the workhorse of industry due to their robustness, simple and rugged structure, low cost and reliability. Traditionally, AC machines have been used in open-loop constant speed applications. The linear induction motor (LIM) is an alternative formation of a rotational induction machine (RIM). Typically, the LIM is designed for high force and stroke motion applications, such as material handling and transportation systems. Often a LIM moves along a linear rail directly, so it provides precision positioning tracking performance and high dynamic stiffness with a hard stop when equipped with a linear encoder and closed-loop control methods. A variable frequency vector control is the foundation of modern high performance AC drives for rotary induction motors. The driving principles of the LIM are similar to the RIM, but its control characteristics are more complicated than the RIM. When driven by a field-oriented controller, also known as a vector controller, LIM behaves like a separately excited DC machine where flux and motion dynamics are controlled independently in order to achieve high performance from the IM drives. The vector control method provides velocity and position control of a LIM effectively. In this paper, a mathematical model of a linear induction motor is presented based on the synchronous d-q reference frame. The secondary field oriented vector control strategy is developed for precise force control to achieve the desired speed profile for varying load conditions. Under the developed control scheme,the controller stabilizes the LIM effectively when the mass of the slider is varying. The effectiveness of the proposed control scheme is verified by simulation examples.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 2012
Accession Number
ADA563034

Entities

People

  • Arthur Rimmele
  • Qing Dong
  • Saroj Biswas
  • Valerie Rafalko

Organizations

  • Naval Air Warfare Center Aircraft Divison

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Aerial Warfare
  • Circuits
  • Closed Loop Systems
  • Control Systems
  • Electric Current
  • Electric Motors
  • Electrical Circuits
  • Equivalent Circuits
  • Frequency
  • Induction Motors
  • Magnetic Fields
  • Materials
  • Mathematical Models
  • Models
  • Motors
  • Simulations
  • Voltage

Fields of Study

  • Engineering

Readers

  • Control Systems Engineering.
  • Systems Analysis and Design
  • Underwater engineering and Marine Technology.