Sources on Making Current Transformers[edit | edit source]

Title Link Comments
Non-Academic Sources (Blogs, Forums, etc)
The current transformer This is a helpful content on different types of current transformers and their working principle. But prior to the using of this blog for transformer designing process, it will be good to go for well established electronics sources.
The Current Transformer A helpful blog post detailing some of the underlying theory and equations used in making current transformers. It may be wise to use this as a baseline reference - but equations should be verified & cited from an EMAG or power electronics book.
Current Transformer - Definition, Principle, Equivalent Circuit, Errors, and Types Another blog-like post about general current transformers. One of the most useful things to get from this work is the phasor analysis of a current transformer.
How to build very low cost current transformer? This is a stack exchange post about making current transformers. Some pretty good breakdowns in the responses. Once again all of the work should be verified against a reputable source.
Wattmeter In this blog post, he makes a watt meter, and most notably winds the current transformer by hand. Something important to note is in his measurements he does not note any of the phase angle compensation - which is something I will have to characterize for my current transformers.
How do I design a current transformer? Another Stack exchange post about making CTs. Good listing of mathematics & variables used in designing CT.
Current Sensing Theory Contains a good reference on CTs vs Hall effect Current sensing.
Academic Sources
A Current Transformer Model Based on the Jiles–Atherton Theory of Ferromagnetic Hysteresis Looks like a fancy way to model CTs mathematically. Likely an unnecessarily high level for this project. Don't think simulation will be necessary.
An Efficient Compensation Algorithm for Current Transformer Saturation Effects This looks like a pretty good paper that details recognizing CT saturation and methods to compensate. Though I won't be looking at the specific algorithms in this paper - recognizing the saturation point may be an important point for device characterization.
High-Current High-Precision Openable-Core AC and AC/DC Current Transformers They go into analysis about air gap transformers --- something that may be pretty transferable to the kind of analysis that I'll do for my transformers.
Calibration of Current Transformers in distorted conditions Analysis of CTs in distortion -- may be a good to set of tests to put our transformers under to characterize their robustness.
Transformer and Inductor Design Handbook This website doesn't work very well - might be sketchy. But also a design handbook would be helpful
Self-Contained Wireless Hall Current Sensor Applied for Two-Wire Zip-Cords This paper details a custom current transformer that actually is made to harvest power to run the wireless measurement circuit. This is a good idea and potentially worth applying to later iterations.
Electromagnetics for Engineers: With Applications to Digital Systems and Electromagnetic Interference This is a book on E-Mag with good solid references on Transformers.
Power System Analysis Third Edition This is a book on Power Systems - and could also be used as a reference for phase angle analysis & transformer parameter specification.
Dual drive coils design for a long stroke electromagnetically actuated micro-positioning system Embedding coils in circuit boards essentially
Cylindrical halbach magnet array for electromagnetic vibration energy harvesters Just a potential application of this system
Design, Fabrication, and Analysis of a Coil Assembly for a Multistage Induction-Type Coilgun System Another application - albeit too large for our specific system
Current Transformer Circuits for Power Electronics Applications A doctoral thesis on using CTs for high frequency Power electronics switching. It goes through a lot of theory about CTs and may prove to be an invaluable resource.

Sources on Making Process Automation Equipment[edit | edit source]

Title Link Comments
Academic Sources (Papers, Books)
RepRapable Recyclebot The spool guiding system is similar to what we're doing.
AC drive control system of the wire drawing machine with DTC control and fuzzy controller Wiring drawing machine. It has some good analysis on the spooling velocity & some of the control methods (Though I think a fuzzy controller may be overkill for our application
Automatic level and bender control for hot finishing mill using flatness measurement of steel strip Spooling sheet metal and using machine vision to keep material uniformity.
ITER PF6 winding line multi-axis automatic controlling system A pretty hardcore spooling system for industrial servos.
Fused Filament Fabrication (FFF) of Metal-Ceramic Components Though it is not the focus of the paper - there is a second on spooling the custom ceramic filament
A 3D Printer for Interactive Electromagnetic Devices This is a pretty cool system that combines 3DP and coil winding. First it prints the structure, then it winds the coil --- all in the same system. It allows for embedded coils etc.
Rolled‐Up Self‐Assembly of Compact Magnetic Inductors, Transformers, and Resonators Manufacturing of smaller EMAG devices based around Lithography -- not really relevant
Injection molding of magneto-sensitive polymer composites Injection molding of composites for the cores of Emag devices.

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