Engineering:Helical armature
A helical armature is a form of air-gap electric motor or generator armature wound in a helical fashion as opposed to a conventional random or orthocyclic winding. Such a design is of interest in superconducting motor and generation technology,[1] though comparatively little research has been done on the subject. An important and remarkable feature of helical armature windings is that they have no end windings.[2] Moreover, as each conductor follows a helical path of constant pitch, helical windings are not easily divided into active and end regions.[1] An important downside, though, is that such armatures provide poor winding factors.[3]
Use in motors
Motors of helical armature design have a lower winding resistance, allowing the motor to run more efficiently, and giving it a longer lifespan.[2] Helical windings also provide low inertia and smooth torque for low-speed DC motors.[1] A disadvantage is that they have relatively low winding ratios.[3][2]
Use in generators
An advantage of helical armature windings in superconducting generators is that they have higher VA ratings, lower armature resistance, and lower synchronous reactance.[3] Future superconducting generators would benefit from a helical winding because due to the absence of active and end zone it can be supported uniformly, unlike a conventional winding. There is a <10% loss in motor flux though, but this would be compensated for by the various advantages in this design.[1]
See also
References
- ↑ 1.0 1.1 1.2 1.3 Anderson, A.F.; Bumby, J.R.; Hassall, B.I. (1980). "Analysis of helical armature windings with particular reference to superconducting a.c. generators" (in en). IEE Proceedings C Generation, Transmission and Distribution 127 (3): 129. doi:10.1049/ip-c.1980.0024. https://digital-library.theiet.org/content/journals/10.1049/ip-c.1980.0024.
- ↑ 2.0 2.1 2.2 Miller (2022-08-01). "Simulation Technology for Electromechanical Design : JMAG". https://www.jmag-international.com/.
- ↑ 3.0 3.1 3.2 Kirtley, James L. (May 1995). "AIR-CORE ARMATURE SHAPE: A COMPARISON OF HELICAL AND STRAIGHT- WITH-END-TURNS WINDINGS" (in en). Electric Machines & Power Systems 23 (3): 263–278. doi:10.1080/07313569508955622. ISSN 0731-356X. http://www.tandfonline.com/doi/abs/10.1080/07313569508955622.
 |  |
