Rubber Litz Wire, Feature : Flexible

<p>Litz wire conductors are beneficial for reducing AC losses in high frequency windings. Parashar Vidyut udyog offers litz wire in many constructions with multiple layers of insulations to meet meet voltage withstand requirements. Litz wire is a bunch of several strands of enamelled copper wire. It&rsquo;s construction vary from a simple bunch of conductor or multiple cores laid up together.&nbsp;</p> <p>&nbsp;</p> <p>The Litz wire is designed to reduce the skin effect and proximity effect losses in conductor at high frequencies up to 1 MHz. Litz wires are typically used in HF transformers, HF inductors, electronic chokes, Toroidal coils, proximity switch, relays, Induction heating, induction, motors, sonar equipment, Inverters, power supply units, SMPS, ultrasonic generators, medical , sterlization equipment, AC-DC converters, Identification systems, magnetic loading, Hearing aids, repeating coils, deflexion yokes, fluorescent lamp ballast, solar inverters, wind power generators, UPS, Eximer Laser and in many other high frequency applications.</p> <p>&nbsp;</p> <p>Litz Wire sizes are generally expressed in abbreviated format i.e. N/XX, Where N equals the number of strands, and XX is the conductor diameter of each strands in SWG/AWG/mm. For example, a typical size of a Litz wire would be expressed as "90/46 SWG" or 90 strands of 46 SWG (0.061 mm).</p> <p>&nbsp;</p> <p>We have a range of Litz Wire and are manufactured from enamelled copper wires made up of high quality copper rods and modified polyurethane, polyesterimide wire enamels as basecoat and aromatie / polyamide as top coat. These are suitable for thermal class 155&deg;C to 240&deg;C. These wires have very good self-fluxing, solderability and high thermal properties.</p> <p>&nbsp;</p> <p>Litz wire are avialable in two forms Served or Unserved. Serving means that the bunched enamelled copper wire have a outer protective covering of one or two lapping of silk yarn, nylon, polyester, Cotton or Nomex (High temperature aramid). Typically serving is used to protect thin film insulation of the individual strands. The serving adds about 0.06 mm to the diameter of Litz Wire. The first lapping of serving is applied to the bunched wires in a direction opposite to the twist of the bunched wires. If a second lapping is to be applied it shall be in the opposite direction to the first lapping. The covering is uniform in quality and each lapping is even and uniform.</p> <p>&nbsp;</p> <p><strong>Reason of using Litz Wires in high frequency applications.</strong></p> <p>The DC (0 Hz) resistance of a conductor depends on its cross sectional area. A conductor with a larger area has a lower resistance. The resistance also depends on frequency because the effective cross section area changes with frequency. As frequency increases, conduction begins to move from an equal distribution through the conductor cross section toward existance almost exclusively near the surface. Depending on the conductor bulk resistivity at sufficiently high frequency all the RF current is flowing within a very small thickness at the surface. Furthermore the current concentrates nearest to the surface that abuts the highest relative dielectric contant. So round conductors such as wire or cables donot conduct much current near their axis, So the central material is not used effectively.</p> <p>&nbsp;</p> <p>One technique to improve the effeciency is to reduce amount of material that does not carry current by making the conductor of hollow tubing. The large surface area of the tube zonducts the current with much less resistance than a solid wire with the same cross sectional area would. The tank coils of high power radio transmitters are often made of copper tubing, silver plated on the ouside to reduce resistance.</p> <p>&nbsp;</p> <p>Litz wire is another method which employs a standard wire with individually insulated conductors (forming a bundle). Each thin conductor is less than a skin depth so an individual strand does not suffer a skin effect loss. The strands must be insulated from each other - otherwise all the wires in the bundle would short together, behaves like a single large wire, and still have skin effect problem. Furthermore the strands cannot occupy the same radial position in the bundle over long distances. The electromagnetic effect that cause the skin effect would still disrupt conduction. The weaving or twisting pattern of the wire in the bundle is designed so that the individual strands are on the ouside of the bundle for a distance and are inside for a distance. If each strand has a equally among every strand within the cable.</p> <p>&nbsp;</p> <p>In case of multiple wires or multiple turns, such as windings in transformers and inductors, the proximity effect causes losses to increase at high frequency even sooner and more rapidly than does skin effect. Proximity effect is the tendency for curent to flow in loops or concentrated distributions due to presence of magnetic fields generated by nearby conductors. In transformers and inductors, proximity effect losses are generally more significant than skin effect losses. In Litz Wire winding proximity effect may be subdivided in to internal proximity effect (the effect of other currents within the bundle) and outer proximity effect (the effect of the current in other bundles). The Litz wires are twisted or weaved just to ensure that the strand currents are equal. Where a simple bunched conductor wire can accomplish this adequately. Where skin effect would be a problem more complex Litz wire constructions can be used to ensure equal strand current.</p> <p>&nbsp;</p> <p>Litz wire is very effective below 500 KHz. It is rarely used above 2 MHz because at frequencies above 1 MHz the benefit becomes gradually offset by the capacitive build up between the strands. Litz wire has a higher impedance per unit cross sectional area but Litz Wire can be used at thicker cable sizes hence reducing or maintaiing cable impedance at higher frequeny.</p> <p>&nbsp;</p> <p><strong>Benefits of Litz Wire</strong></p> <ul> <li>Reduce A.C. Losses in high frequency winding.</li> <li>Increased Effeciency.</li> <li>Mitigation of Skin effect.</li> <li>Mitigation of Proximity Effect.</li> <li>Minimum Eddy Current losses.</li> <li>Lowered operating temperatures.</li> <li>Reduced footprint of final product.</li> <li>Substancial weight reduction.</li> <li>Avoidance of "Hot Spots".</li> </ul> <p>&nbsp;</p> <p><strong>Application of Litz Wire</strong></p> <ul> <li>High Frequency Transformers</li> <li>Toroidal Coils</li> <li>Stator Winding</li> <li>High Frequency Inductors</li> <li>Power Transformers</li> <li>Inverters</li> <li>Motor Generators</li> <li>Hybrid Transportation</li> <li>Wind Turbine Generators</li> <li>Communication Equipments</li> <li>Marine Acoustic Control Systems</li> <li>Induction Heating Equipments</li> <li>Sonar Equipments</li> <li>Radio Transmitter Equipments</li> <li>Switch Mode Power Supply</li> <li>Ultrasonic Equipments</li> <li>Linear Motors</li> <li>Sensors</li> <li>Antenas</li> <li>Grounding Applications</li> <li>Wireless Power Systems</li> <li>Electric Vehicle Chargers</li> <li>High Frequency Chokes</li> <li>High Frequency Motors</li> <li>Medical Sterlization Equipments</li> <li>Medical Device Chargers</li> <li>High Q Circuitry</li> <li>Tuning Circuitry in High Power Radio</li> <li>Flywheel Energy Storage</li> <li>Plasma Containment Coils</li> <li>Hearing Aids</li> <li>Relays</li> <li>Eximer Laser</li> <li>Welding Machine</li> </ul>