4pole

4pole, or four-pole, is a term used in several technical domains to describe devices or components that have four electrical poles or conductors. Its precise meaning depends on the context in which it is used.

In electrical machines, a four-pole configuration refers to motors or generators with four magnetic poles on the rotor or stator. At a given supply frequency, the synchronous speed is determined by Ns = 120 f / p, so a four-pole machine runs at a lower speed and typically delivers higher torque than designs with fewer poles. Four-pole designs are common in industrial motors and some generators.

In filter theory and signal processing, a four-pole network denotes a fourth-order system. Such filters can provide steeper attenuation beyond the cutoff than lower-order designs and are implemented in various configurations using four reactive elements or equivalent circuitry.

In connectors and consumer electronics, four-pole typically describes a connector with four conductors. Examples include 3.5 mm TRRS (tip-ring-ring-sleeve) jacks used for stereo audio plus microphone, as well as certain four-pin DIN or other four-conductor interfaces. These arrangements enable additional channels or signals beyond a simple stereo connection.

Other uses: The term may appear as a model name, product designation, or brand identifier in different industries. Because it is context-dependent, clarifying the specific application is important when encountering the term “4pole.”