Linear electric machines—A personal view

  title={Linear electric machines\&\#8212;A personal view},
  author={Eric R. Laithwaite},
  journal={Proceedings of the IEEE},
  • E. Laithwaite
  • Published 1 February 1975
  • Materials Science
  • Proceedings of the IEEE
The history of linear motors is a history of shape. Once having departed from the cylindrical geometry of rotating machines, a wider world of three-dimensional design becomes possible. Linear induction motors dominate the field of linear drives to the same extent as does the rotary induction machine in relation to more complicated adjustable-speed motors. It is therefore thought appropriate to devote only one section to linear motors other than induction. A fairly full treatment of… 
Basic Design equations of Linear Electric Machines
Derived design equation is used to design double sided linear induction motor (DSLIM), 12 meter in length in this paper, and 3D Maxwell software isUsed to analyze this motor at no-load condition.
Design criteria of tubular linear induction motors and generators: A prototype realization and its characterization
In this paper a mathematical model of tubular linear induction machines (TLIM) with hollowed induced part is recalled. Moreover the design criteria of a TLIM with hollowed iron induced part are
Short primary linear drive designed for synchronous and induction operation in different sections
The potential for very long tracks, multiple vehicles travelling at high speed, high positioning repeatability and rapid acceleration turns the short primary linear drive into a good candidate for
Combined operation of short-primary permanent magnet linear synchronous motor and linear induction motor in material handling applications
  • T. Neto, P. Mutschler
  • Engineering
    2012 Twenty-Seventh Annual IEEE Applied Power Electronics Conference and Exposition (APEC)
  • 2012
In material handling applications where high precision, very long tracks and closed paths are required, short primary linear drives are proposed. The short primary type uses an active vehicle (moving
Speed control of a two-degrees of freedom induction motor with rotor Helical Motion for industrial applications
  • M. Caruso, V. Cecconi, R. Miceli
  • Materials Science, Engineering
    2014 AEIT Annual Conference - From Research to Industry: The Need for a More Effective Technology Transfer (AEIT)
  • 2014
This paper describes the realization of a two-degrees of freedom induction motor prototype with rotor helical motion, suitable for several industrial applications as grinders, augers, drilling and
Comparative study of tubular partitioned stator permanent magnet machines
  • Z. Zhu, A. Shuraiji, Q. Lu
  • Physics, Business
    2015 Tenth International Conference on Ecological Vehicles and Renewable Energies (EVER)
  • 2015
Permanent magnet (PM) linear machines have been extensively used for many linear motion applications since they can offer high efficiency, simple structure and high speed operation. In this paper,
Performance comparison of tubular linear induction motors with different primary winding connections
This paper presents an experimental characterization and comparison of the performances achieved by a tubular linear induction motor (TLIM) prototype with different typologies of primary winding
Magnetic and force performance analysis of tubular linear motor with two halbach topologies
Halbach array has been widely applied to improve the magnetic and force performance of tubular linear motors for its attractive features. Conventionally, the Halbach permanent magnet (PM) array is
Analysis of Finite Width Effects of Single-sided Linear Induction Motor Using Hankel Functions
Construction of a prototype Single Sided Linear Induction Motor (SLIM) is not possible taking stator and rotor width to be infinite because the formation of stator winding is not possible without the
Field simulation of linear induction machines illustrating the peak-to-peak ripple in propulsive force and its dependence on the length of the primary
In this paper, results of Finite Element Analysis of three Linear Induction Machines have been presented and compared. The three LIMs are identical in all respects except that the length of their


Linear motors with transverse flux
The paper describes a new family of linear machines which may have advantage in applications where the pole pitch is very much greater than the machine width. Compared with the more usual kind of
An oscillating synchronous linear machine
The paper describes the development of a new type of a.c. generator in which the moving member travels between a d.c. pole structure in a straight line with reciprocating motion. Tha induced e.m.f.
Application of linear induction motors to high-speed transport systems
The linear motor has been chosen as the method of propulsion for the full-scale prototypes of several high-speed transport systems currently being developed. The paper sets out the problems of the
Linear-motor topology
In rotating electric motors, the working magnetic flux is usually assumed to cross the airgap substantially in radial planes, and, in this respect, the working flux could be said to be
Brushless variable-speed induction motors
The first part of the paper describes experiments performed on a spherical machine. These experiments show that speed ranges up to 5.5:1 can be obtained, and that the speed range obtained depends
Rack-and-pinion motors: hybrid of linear and rotary machines
The field over an open-sided linear motor contains a rotating component which can be used to spin rotors of a variety of types. If the field of the linear motor is visualised as a magnetic `river?,
Speed-changing induction motors. Further developments in pole-amplitude modulation
An earlier paper has described the basic steps which led to a practical form of 8/10-pole induction motor, of good performance, having only one stator winding. The principle on which this
Transverse-flux tubular motors
The paper describes a new range of tubular induction motors. Compared with the usual forms of tubular motors, in which the magnetic flux lies largely in planes that are parallel to the direction of
Linear-motion electrical machines
A survey of linear-motion electrical machines is presented. Although various types of dc and ac linear machines are briefly mentioned, linear induction motors are the main concern of the paper and
Linear induction motors for low-speed and standstill application
Devices which are required to produce force with virtually no movement have zero power output. The effectiveness of such devices cannot therefore be assessed in terms of their efficiency or