Leading Sealed Coil Manufacturers

Most motors are used in normal conditions at a factory, office, or home. Seldom do those motors have to face conditions that may damage the coil or interfere with the operation of the motor. There are circumstances when a coil may be faced with situations where it will have to endure a more aggressive and hostile atmosphere. Motors designed to operate in those conditions require an extra layer of protection to prevent them from failing. The type of coil designed to meet those kinds of applications is referred to as a sealed coil.

What is a Sealed Coil?

The name of a sealed coil is a full definition of what it is. Sealed coils are tightly wound insulated coils that have been treated with an extra layer of material as a form of protection. The manufacture of a sealed coil follows the normal process of winding and insulating. Once the coil has been completed, it is sealed with a type of material, which can be a polymer resin, epoxy, or silicone resin.

There are several reasons to seal a coil in an extra layer of protection. The most obvious reason is as a means of protection against the elements from damaging a coil and preventing it from performing properly. Moisture is one of the biggest concerns. The process of injecting a liquid material over a coil and baking it makes it impenetrable.

Another benefit of sealed coils is their ability to dissipate heat, a major factor in the deterioration of electronic devices. The tight-fitting seal is forty times more efficient at removing heat and keeping the coil cool.

Materials Used to Seal a Coil –

Some of the most common materials used to seal coils are chosen for their ability to adhere to the coil wires and fill in the gaps and empty spaces that are common to electrical coils. Some of the popular materials are polymer resin, silicone resin, and epoxy, with polymer resin being the most used.

Epoxy is one of the more sturdy and durable materials that has thermal stability and able to resist a wide variety of liquids and gases. When it is applied to a coil, it easily fills in the gaps and empty spaces to enhance the performance of the coil.

As with epoxy, polymer resin is an excellent sealing material with the added feature of being able to seal windings and laminations as a means of dampening noise and lessening the vibrations produced by spindles. A benefit of polymer resin is how it solidifies and becomes rigid after the curing process.

Silicon resin has all of the properties of polymer resin and epoxy with the additional ability to perform at a wide variety of temperatures. The process for applying silicon resin is to inject it into a coil.