Industrial Grade Air Core Induction Coil, 86 x 30.5 x 14 mm Rectangular Hollow Winding, Multi-Strand Copper, Tab or Lead Terminals

1. Product Name

This page describes a rectangular hollow air core induction coil: a flat wound coil of multi-strand round copper wire, with no magnetic core and no bobbin inside the window, taped for high temperature service and terminated either with male tab terminals or with insulated lead wires. The dimensioned build measures 86 mm outer length, 30.5 mm across the short side and approximately 14 mm side height, with an R3 radius on the four outer corners and a general tolerance of ±0.5 mm.

The material shows the coil in two termination builds and in more than one size. Only the 86 x 30.5 x 14 mm build is dimensioned; the smaller coils that appear beside it in the group photographs are shown for context and are not specified here. No model number is assigned to this coil in the material, so the product code field is left blank and the coil is identified by this drawing.

2. Construction & Materials

The winding is a flat rectangular helix of round copper wire. Each turn is not a single conductor: the copper runs as a parallel multi-strand bundle, which is what the close-up view shows. Winding the copper as a bundle instead of one heavy gauge keeps the wall of the coil thin, reduces AC resistance for a given copper cross-section, and makes the rectangular form easier to hold to tolerance. The supplier describes the conductor as high purity copper chosen for low resistance and high conductivity.

There is no core and no former inside the window, so the field is set by the winding geometry: outer size, window size, number of layers and copper section. A coil of this construction does not saturate the way a cored inductor does, and its inductance stays close to constant as current rises until thermal limits or proximity effects take over. That is why a part of this shape is normally specified by inductance at a stated frequency and by the current it has to carry, rather than by a core grade.

The two long sides of the coil are padded with white tape or a sleeved wrap, and an amber high temperature tape band secures the winding at each return bend. The padding protects the copper from abrasion where the coil is clamped or handled, and the amber band holds the bundle together at the corners. At one end a white moulded block carries the two tabs and the joints to the winding, with the tab tails sleeved in yellow insulation.

3. Feature

Hollow rectangular winding The window is open, so the coil can sit around a workpiece, a busbar or a tube with no core in the way.

Multi-strand copper Round wire run as a parallel bundle, which keeps the winding wall thin and lowers AC resistance against a solid conductor of the same section.

High temperature tape An amber tape band at each return bend and white padding on the long sides, with a supplier rating of up to 180 °C.

Two terminal builds Male tabs with yellow sleeves for a spade connection, or red and black leads crimped to insulated female quick-disconnect receptacles.

Held to ±0.5 mm Outer length and short side are toleranced at ±0.5 mm, with an R3 radius on all four outer corners.

4. Advantage

Stable geometry A wound and taped rectangular coil holds its shape, which matters when the coil is clamped, potted or dropped into a housing.

Thermal headroom The 180 °C insulation rating and the open window both help the winding shed heat, which is the real limit on a coil with no core to spread it.

Easy integration Tab or plug-in lead termination removes the need to solder the coil into a harness at assembly, and the multi-terminal design allows the wiring configuration to be changed.

Built to requirement Wire gauge, lead length, terminal type and coil size are quoted to order rather than fixed to one catalogue build.

5. Application

The material does not name a specific end use for this coil. The application view shows it on a bench next to a supply unit and an oscilloscope. The uses listed below are the ones this construction is normally specified for and are general context, not claims made in the source — confirm the duty with us before ordering.

Induction heating work coils A hollow rectangular winding of this size normally surrounds the part being heated, with the window sized to clear the workpiece.

Resonant tank and filter coils In power converters and inverters, where a rigid air core coil is preferred to a cored inductor for its linearity and its tolerance of high current.

Coupling coils for wireless power For transfer or sensing across a gap, where the open window and shallow profile suit a planar arrangement.

Laboratory and test set-ups The supplier image shows the coil on a bench next to a supply unit and an oscilloscope, which is the typical way a build of this size is evaluated.

Custom industrial builds Where a standard inductor will not fit the available space and the coil has to be wound to a drawing.

6. Specifications

The tables below separate what the material states from what it leaves open. Values that are not published in the source are marked Not stated rather than filled with a typical figure, because a coil of this size can be wound for very different inductance and current depending on the copper section and the number of layers.

6.1 Summary

6.2 Winding and electrical

6.3 Mechanical dimensions

6.4 Materials and termination

6.5 Quality and compliance

7. Ordering

Quote against the drawing and the electrical requirement. A useful enquiry gives the inductance and the frequency at which it is measured, the DC resistance limit, the RMS and peak current, the duty cycle, the ambient temperature and the allowable rise, the space available and whether the coil is clamped, potted or free standing, the termination you want (tab or lead, lead length, size of receptacle), and the quantity per order and per delivery. With those we can confirm the winding build, the copper section and the terminal arrangement, and return a price and a lead time.

On compliance: the supplier material carries CE, UL, RoHS and CCC logos, but no certificate number, no issuing body and no test report comes with it. No compliance claim has therefore been made on this page, and that logo panel has not been used as a product image. If your market needs a declaration, ask for the certificate for the specific standard and we will send the current copy with its number and validity date. The logo panel on its own is not evidence of certification.

Brand / manufacturer: ZXY, Shenzhen Zhixiangyuan Electronics Co., Ltd. http://www.zxycoil.com