Industrial Grade Air Core Induction Coil, 86 x 30.5 x 14 mm Rectangular Hollow Winding, Multi-Strand Copper, Tab or Lead Terminals
A rectangular hollow air core induction coil, wound from multi-strand round copper wire and taped for high temperature duty. The 86 mm by 30.5 mm body and its 14 mm side height give a large open window for a coil that has to sit around a workpiece or a busbar, and the flat winding keeps the build shallow.
- 86 x 30.5 mm outer, 14 mm side height, R3 on the four outer corners, general tolerance ±0.5 mm
- Multi-strand round copper winding in a flat rectangular helix, no core and no bobbin in the window
- High temperature resistant tape insulation, supplier temperature rating up to 180 °C
- Two termination builds: male tabs with yellow sleeves, or red and black leads with insulated receptacles
- Custom wire gauge, lead length, terminal type and coil size
- Quoted against your inductance and DC resistance at the operating frequency you specify
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
| Item | Specification | Note |
|---|---|---|
| Product type | Air core induction coil | Hollow rectangular winding |
| Build dimensioned here | 86 x 30.5 mm, 14 mm side height | From the supplier outline drawing |
| Winding | Multi-strand round copper wire | Strand count and gauge not stated |
| Core | Air core, none fitted | No bobbin inside the window |
| Outer insulation | High temperature resistant tape | Amber band plus white long side padding |
| Temperature rating | Up to 180 °C | Supplier data panel |
| Termination | Male tabs, or leads with receptacles | Two builds shown in the material |
| Customization | Wire gauge, lead length, terminal, size | Quoted to order |
6.2 Winding and electrical
| Parameter | Value | Note |
|---|---|---|
| Inductance | Not stated | Send the value and the frequency it is measured at |
| DC resistance | Not stated | Confirm the limit for your build |
| Rated current | Not stated | Confirm RMS, peak and duty cycle |
| Number of turns | Not stated | Set by the winding build |
| Conductor | Round copper, multi-strand | The bundle is visible in the close-up view |
| Wire diameter | Not stated | Per strand |
| Strand count | Not stated | Ask for the build sheet |
| Operating frequency | Not stated | Drives the copper section that is chosen |
| Insulation class | Not stated | 180 °C is the only thermal figure given |
6.3 Mechanical dimensions
| Item | Value | Tolerance / note |
|---|---|---|
| Outer length | 86 mm | ±0.5 mm |
| Short side | 30.5 mm | ±0.5 mm, read the note below before ordering |
| Side height | 14 mm | Approximate, no tolerance given |
| Corner radius | R3 | Four outer corners, not toleranced |
| General tolerance | ±0.5 mm | Unless otherwise specified on the drawing |
| Window | Not dimensioned | No window size appears anywhere in the material |
6.4 Materials and termination
| Item | Specification | Note |
|---|---|---|
| Conductor | Round copper wire, multi-strand | High purity copper per the supplier |
| Winding insulation | High temperature resistant tape | Amber band at each return bend |
| Long side finish | White tape padding or sleeved wrap | Material not stated |
| Terminal block | White moulded part | Carries both tabs and the winding joints |
| Tabs | Male quick-disconnect | Yellow insulating sleeves |
| Lead build | Red and black insulated leads | Insulated female quick-disconnect receptacles |
| Temperature rating | Up to 180 °C | Applies to the insulation, per the supplier |
6.5 Quality and compliance
| Item | Statement | Note |
|---|---|---|
| Compliance in the material | CE, UL, RoHS and CCC logos | No certificate number, issuing body or report supplied |
| Position taken here | No compliance claim is made | Ask us for the certificate your market needs |
| Inspection | Not stated | Confirm the AQL and the test items on the order |
| Dielectric test | Not stated | Confirm the test voltage on the order |
| Traceability | Not stated | Confirm marking and batch records on the order |
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