How are toroidal transformers wound?

OK the wire is wound on an iron ring. Then what happens? Surely somebody has the definitive answer or there wouldn't be any toroidal transformers!How are toroidal transformers wound?Device used in nuclear-fusion research for magnetic confinement of plasma.



It consists of a complex system of magnetic fields that confine the plasmaof reactive charged particles in a hollow, doughnut-shaped container. The tokamak (an acronym from the Russian words for toroidal magnetic confinement) was developed in the mid-1960s by Soviet plasma physicists. It produces the highest plasma temperatures, densities, and confinement durations of any confinement device.How are toroidal transformers wound?Toroidal transformers, and toroidal coils, are wound by first placing a large diameter ring with a split in it through the toroid. The large ring is then loaded with magnet wire (thin insulated wire). The large ring is then rotated with a follower on its rim to stop the wire from coming free. Think about the length of wire on one turn of the toroid as maybe one sixth of a turn of the larger ring. When the correct number of turns are on the toroid, the wire left on the large ring is cut, and unwound. The ring is then removed. With experience, the amount of excess wire on the large ring is very small. The large ring is generally driven by a motor, and supported by three bearings.

Hope this helps.

Look here to see what I have been talking about.

http://www.bmpequip.com/torodial-winding鈥?/a>How are toroidal transformers wound?The toroid used for detecting / sensing very small current in the Electric cabling. I can say one example which I know and used. You know that torroid is a round shaped transformer. the cable is taken through the toroid by one phase. The cable is working as the primary of the transormer. The flux developed in this field transforms into current by the winding of the toroid which acts as secondary. The coil is proportionally wound according to your need. Normally, toroid is connected to an earth leakage realay where it requires sensing of current in means of 30 or 300 milli amperes. In 30 mA toroid, the leakage current is allowed upto 30 mA, and when there is a current more than that, it will sense and relay will trip the circuit. In these, you have to remember only one thing, cable which is inserted through is the primary and the winding is secondaryHow are toroidal transformers wound?
Toroidal transformers are wound using a bobbin of wire that is passed through the center of the toroid as many times as each winding coil needs.

This is all controlled by a toroid winding machine which produces a neat finished product.