# What is a bifilar coil?

## What is a bifilar coil?

In engineering, the word bifilar describes wire which is made of two filaments or strands. It is commonly used to denote special types of winding wire for transformers. Wire can be purchased in bifilar form, usually as different colored enameled wire bonded together. For three strands, the term trifilar coil is used.

## What are the disadvantages of a bifilar transformer?

The main disadvantage of this method is that it greatly increases the switching time of the relay. When used in a switching transformer, one winding of the bifilar coil is used as a means of removing the energy stored in the stray magnetic flux which fails to link the primary coil to the secondary coil of the transformer.

What is a bifilar wound toroidal transformer?

Bifilar wound toroidal transformer. A different type of bifilar coil is used in some relay windings and transformers used for a switched-mode power supply to suppress back-emf. In this case, the two wire coils are closely spaced and wound in parallel but are electrically isolated from each other.

### Why do the wires of the bifilar coil share the same flux?

Because of their proximity, the wires of the bifilar coil both “see” the same stray magnetic flux.

### What is a bifilar dial?

A bifilar dial is a type of sundial invented by the German mathematician Hugo Michnik in 1922. It has two non-touching threads parallel to the dial. Usually the second thread is orthogonal – (perpendicular) to the first.

How does a bifilar sundial work?

Bifilar sundial. A bifilar dial is a type of sundial invented by the German mathematician Hugo Michnik in 1922. It has two non-touching threads parallel to the dial. Usually the second thread is orthogonal-(perpendicular) to the first. The intersection of the two threads’ shadows gives the local apparent time.

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