kierrejohdin

Kierrejohdin is a Finnish term that translates to "screw conductor" or "spiral conductor." It refers to a type of electrical conductor where the individual wires are twisted or wound around a central core. This construction can offer several advantages over simple, untwisted wires.

One primary benefit of a kierrejohdin is its increased flexibility. The spiraling of the wires allows the conductor to bend more easily without damaging the individual strands. This makes it particularly useful in applications where the cable needs to be moved or flexed frequently, such as in robotics, trailing cables, or flexible power cords.

Another advantage can be improved electromagnetic compatibility (EMC). When conductors carrying alternating currents are twisted together, the magnetic fields they generate tend to cancel each other out. This reduces the amount of electromagnetic interference (EMI) that the cable emits and also makes it less susceptible to external EMI. This is why twisted pair cables are commonly used in telecommunications and data networking.

The term kierrejohdin encompasses a range of constructions, from simple twisted pairs to more complex stranded conductors where multiple smaller wires are twisted together to form a larger conductor. The specific number of twists per unit length, the gauge of the individual wires, and the arrangement of the strands all contribute to the conductor's electrical and mechanical properties. In some contexts, it can also refer to conductors used in specific types of electrical equipment where a spiral form is inherent to the design.