Electromagnets & Coils

Coils FAQ

What size coils are you able to make?

What temperature rating does your wire have?

What kind of wire is available for coils?

How would I get a bobbin to fit my application?

Can you varnish coil windings?

What size coils are you able to make?
We do not have an exact size that dictates dimensions but there are a few general guidelines that we try to stick to. We are able to deviate from these guidelines but specialized jobs will incur greater costs.
-In general the maximum diameter coil that we are able to wind is 6".
-Typical coil length does not exceed 4 inches.
-The thickest wire that we use is 15 AWG.
-The thinnest wire that we use is 45 AWG.

What temperature rating does your wire have?
The standard wire that we use is rated for 155C. We do regularly wind coils with wire rated up to 220C but often times this wire requires extra labor to grind the insulation off. Various emperature ratings are available.

What kind of wire is available for coils?
We are able to obtain a wide variety of wire type. We regularly wind coils with standard magnet wire, bondable wire and litz wire. Each type of wire fits specific application needs.

How would I get a bobbin to fit my application?
There are several ways that we source bobbins for winding custom coils. The most important factor is quantity. For very small runs we are able to 3D print bobbins in house. This is the fastest way to get custom size bobbins. The printing technology that we use is SLA type printing which yields very good detail. Finished bobbins come out very close to a molded part. For medium quantities of bobbins, we can have them 3D printed out of house or have them made at a machine shop. Molding bobbins is usually the most cost effective method for manufacturing large quantities of bobbins. The tooling cost is much higher than the other manufacturing techniques but the per piece price drops significantly. We offer bobbin and coil drawing services to ensure that you get the highest quality product possible.

Can you varnish coil windings?
Yes we have the ability to varnish coil windings and we even have the capability to vacuum impregnate coils. Varnishing coils is extremely useful for applications where a coil will see significant vibrations. We typically varnish our standard coils rated for AC use to increase reliability.