Improvement of Transverse Flux Linear Induction Motors Performances With Third Order Harmonics Current Injection

Abstract

A noncontacting steel plate conveyance system using the transverse flux linear induction motor (TFLIM) is studied. The steel plate makes up the secondary of TFLIM. A combined control principle of levitation and propulsion for TFLIM is proposed. The output capacity of the power converter for control is limited by its maximum current, but the performance of TFLIM depends on its fundamental component. Then a third harmonic current injection scheme is considered for the drive system, in order to increase the fundamental component, keeping the value of the maximum current invariant.TFLIM characteristics are calculated both for the levitation and propulsion forces acting on the secondary steel plate, on the basis of a three-dimensional electromagnetic field analysing program (J-MAG Studio). In comparison with a sinusoidal current excitation, the propulsion and levitation force of TFLIM increases by 33% and 37%, respectively, when the harmonic current injection level is optimized. Thus, the harmonic current injection scheme is shown to be an effective and practical mean to realize a steel plate conveyance system. Index Terms-Combined lift and propulsion, linear induction motor, third order harmonic current injection, transverse flux machine.

Transverse Flux Machine—A Review

“…This design is suitable for linear TFMs such as the machines in [88], or rotating machines with circumferential arranged phases in [46], [181]- [187]. TFMs with a single winding per core element are presented in [132], [133], [142], [188], [189]. Further, the design of the machine in [190] has an E-core built out of an C-core with an additional bridge core.…”

A Review of Integrated Propulsion, Suspension and Guidance Passive Guideway Maglev Technologies

“…Furthermore, since AC electromagnetic attraction produces only half the average suspension force per unit area compared to a DC electromagnet attraction [44] using a purely alternating current will result in poor suspension performance. In order to improve the suspension performance using this technique a DC current bias can be used to improve the attractive force, such a technique has been used more recently for low speed steel plate transportation [66][67][68].…”

Design trends of linear induction motor (LIM) and design issues of a single sided LIM

“…They built a prototype of the system, using mercury as the conducting fluid. Y. Nozaki, J. Baba, K. Shutoh, and E. Masada (2004) [11] described a noncontacting steel plate conveyance system using the transverse flux LIM (TFLIM). The steel plate makes up the secondary of TFLIM.…”