Magnet (EMI) Cable assembly design

What is the magnet ring use for in cable assemblies

A ferrite ring core, or magnet ring, is a component of Magnet (EMI) Cable assembly designs that helps to minimize or eliminate interference from outside sources. To ensure that gadgets connected to it can function properly, it encases the cable wires and blocks off high-frequency noise. These rings shield electrical connections and data from electromagnetic interference. When it comes to EMI cable shielding and EMC compliance, magnet rings are a common component in our custom cable assemblies. To guarantee clear signal transmission, ferrite cores are often used in audio, USB, and sensor connections, among other applications. The purpose of the cable dictates the size and material of each ring, which are then optimized to minimize noise while maintaining the main transmission path.

The design of different cables magnet ring

Because there is a wide variety of cable assemblies, the Magnet (EMI) Cable assembly design is specific to its intended use. When deciding on a ring, current, data rate, and cable diameter are all taken into account. Compact, loss-free ferrite collars are utilized in thin data cables. Larger cores are used by power or high-current cables to manage the energy. A core can be used to enhance filtering by looping wires through it numerous times. Installation requirements will determine whether a clip-on design is used or if a ring is embedded in the connector overmold.

EMI

Signal distortion and failures can be caused by electromagnetic interference (EMI). Our magnet rings and shields are designed with EMI in mind. To prevent high-frequency noise from escaping the Magnet (EMI) Cable assembly design, the ferrite substance functions as a passive filter. The rings avert data corruption by transforming the noise into minute quantities of heat. The whole cable assembly is able to meet stringent emission regulations thanks to the additional EMI cable shielding. In addition to ferrite cores, our cables frequently feature braided or foil shields, which provide robust protection against radiated and conducted electromagnetic interference (EMI). Devices continue to function normally, even in electrically loud settings, thanks to these combined precautions.

Keep the signal transmission

Magnet rings, when built correctly, may prevent noise without degrading the primary signal. Because of their inherent properties, ferrite beads can pass low-frequency signals (such DC or audio) while attenuating spikes in high-frequency signals. In order to ensure that the typical signal currents encounter little resistance, we meticulously choose the core material and form. Your data or power flow remains untouched, and the end result is a "clean" transfer. This results in reduced mistake rates and greater transmission distances. A more transparent signal is essentially the result of using cables with ferrite cores. This means improved EMI margins and more reliable systems for Magnet (EMI) Cable assembly designers.

High speed data transfer

Quick data rates and minimal noise are requirements of high-speed cables (e.g., USB, HDMI, Ethernet, etc.). Rings of ferrite are useful because they soak up radio frequency noise, which can distort a high-speed waveform. Bit error rates and eye diagrams are both enhanced by the magnet ring's ability to decrease interference. In order to guarantee that every bit of data reaches undamaged, we frequently use cores on data or video cables. A high-speed cable with the correct filters can, in fact, transmit signals faster and farther with no retries required. Similar to this, ferrite filters are used in our design high voltage cable assemblies to safeguard delicate power electronics components. In conclusion, achieving maximum data throughput while complying with EMI restrictions is possible with the correct magnet core.

Magnet ring choices

There is a wide variety of Magnet (EMI) Cable assembly designs available to meet the demands of various cables. Most straight-through assemblies use the conventional round ring (picture above). We provide adaptable solutions with clip-on shells that can be wrapped around cables. Ribbon cables are compatible with flat cores. Every option strikes a good mix between usability and filtering efficiency. Based on your needs, our staff will advise you on the optimal type. Each magnetic cable assembly achieves optimal EMI suppression by using the proper core shape and material.

Overmolded magnet

We have the capability to shape ferrite cores in Magnet (EMI) Cable assembly design directly into the jacket of the cable. This process involves encasing the wires in a ferrite ring before sealing it in plastic resin. The ring is securely fastened, and strain relief is provided at the connector by means of overmolding. Additionally, it prevents the fragile magnet from being hit or wet. The ferrite cannot slip or become lost due to its embedded nature. Ideal for tough wires, this offers a long-lasting, permanent solution. For reliable performance, overmolded rings are used in many high-volume assemblies. Keeping the magnet ring in its designated spot throughout the product's lifetime is possible with an overmolded construction.

Shell assembled type magnet

The two parts of a plastic shell or clip-on ferrite snap together to encase the cable. They don't require disassembling the connectors and can be easily added after the cable is created. You can easily clamp on the magnet cores because they are pre-matched to certain cable sizes. If you need to make a prototype quickly or if you might have to change the filter later, this is the way to go. For instance, snap-on rings are commonly used for test wires or service loops. Cons include a lack of permanence compared to overmolds, the possibility of loosening when handled harshly, and the requirement for an exact fit with the cable. This shell-assembled method, however, shines in situations where adaptability is paramount.

Flying leads wrapping on magnet

In certain cases, we employ a "flying lead" technique, which entails passing individual lead wires through a bigger ferrite core. More turns are achieved by increasing the number of times each wire is wrapped through the core. Wire harnesses and test rigs are good places to use this technique. A smaller ring can nevertheless provide considerable attenuation since the loops increase the core's impedance. Because it often only takes a few spins to do the task, it is also helpful in confined areas. Adding noise filtering during development or in specialty assemblies is made easier using this technique, although it is less prevalent in final products.

Magnet ring on ribbon cable

Particular attention is required for flat ribbon cables. Flat, narrow ferrite strips or tiny cores clamped to the ribbon's end are common tools in our toolbox. Another method involves winding a fine wire with ferrite beads along the cable. These Magnet (EMI) Cable assembly designs are thin enough to prevent interference across all runs of conductors without sacrificing performance. It is possible to individually attach little ferrite beads to each conductor in custom ribbon harnesses. This guarantees that EMI protection is provided to even flat cables with several lines. For ribbon applications, we are able to keep the magnetic cable assembly sizes small by creating these compact magnet solutions.

Application on cable assembly

Injection molded

Wires and connectors are enclosed in a plastic casing in injection-molded cable assemblies. As a result, you have a solid, and in many cases, waterproof, whole. During molding, we can also encase ferrite cores. Extra strain relief and protection for any internal magnet or spring contact are provided by an injection-molded overmold. Engineered resins used in our injection molding lines form strong bonds with cable jackets and connectors. A sealed, long-lasting assembly that can withstand extreme conditions is the end product. As a result of its dependability, injection molding is used by many industrial and medical companies.

Double side ring magnet

It is not uncommon to use two ferrite rings—one on each side of a connection or cable—in high-stakes applications. Extra common-mode and differential noise attenuation is provided by dual ferrites. One ring may be located close to the connector and another near the device end of a cable, for instance. This two-pronged strategy helps satisfy extremely demanding EMI standards by doubling the filtering impact. If required, our assembly method can accommodate cables with two clip-on rings or two overmolded cores. Systems that are particularly vulnerable, such as those in the aerospace or medical industries, benefit greatly from this choice.

Magnet choices

Metal combinations such as manganese-zinc (MnZn) and nickel-zinc (NiZn) are among the several ferrite core materials that we offer. Ferrites of NiZn are capable of handling frequencies in the tens to hundreds of megahertz range, but ferrites of MnZn excel at lower frequencies. We assist you in selecting the most appropriate ferrite material based on your noise spectrum. The overmold contains neodymium or ceramic magnets for permanent magnet applications, such as connecting components or operating reed switches. Our magnetic components are designed to meet RoHS standards. To further increase conductivity, we can mold in EMI shielding substances for cables, which are filled polymers. No matter the cable's electrical or mechanical specifications, we always choose magnetic materials that are a good fit.

Industries and Applications

Industrial & Automation

Motor drives, servos, and sensors used in factories make a lot of electrical noise. Ferrite rings are put on signal and power wires to keep interference out of control circuits. We offer custom cable assembly design for PLCs and robotics to ensure continuous operation in noisy factories.

Aerospace & Defense

There are strict EMI rules for military systems and planes. Our insulated harnesses and magnetic cable assemblies are used in guided systems, avionics, and radar. These cables have braided shields and ferrite cores to keep electromagnetic interference (EMR) from getting in the way of flight controls and communications.

Automotive & EV

Electronic modules have been standard in cars for decades. We can supply and design high-voltage cable assemblies, which frequently include ferrites, for electric vehicle (EV) charging and powertrain applications. To keep crosstalk from happening, OBDII and sensor wires have EMI filters built into them. Our car cables meet both ISO and CISPR standards for radiated emissions.

Medical Devices

Imaging, diagnostic, and patient detection devices can only use signals that are completely clean. We make medical-grade cable assemblies that meet the EMI standards set by IEC 60601 by using ferrite filters. Some cables and leads for ultrasonic probes and monitors have core suppression to keep important measurements from being affected by noise.

Telecom & IT

Consumer electronics, data centers, and networking all have a lot of high-speed connections. We make custom magnetic cable assemblies (like USB, HDMI, and Ethernet with ferrite) to keep data safe from interference. These assemblies make it easier for devices to get CE and FCC certification because they lower electromagnetic interference (EMI) in transmission lines.

Customized Ferrite Shapes

Ring Core

We sell doughnut ferrite cores in different sizes. At our plant, we can machine or custom-drill rings to fit the exact inner and outer diameters of your cables. These ring cores are very useful for overmolded assemblies and threading wire bundles.

Split Core

We offer hinged and clip-on ferrite cores to make installation easier. These split cores are the best choice for fixing or upgrading harnesses. They let engineers secure existing lines without having to cut or re-terminate them.

Cylinder Core

Our long tubular ferrite cores are great for coils or lines that carry a lot of current. These cylindrical shapes can hold a lot of wires together or slide over thick wires. We can customize the length and quality of the material for power electronics to meet your needs.

Integrated Assemblies

In addition to standalone cores, we also use ferrite forms in our cable assemblies. Our custom magnetic cable assembly manufacturer can mold, clamp, or wrap ferrites into your cable if you need them to. This vertical integration leads to better quality and faster prototypes.

OEM Partner

Because we have our own tools and production facilities, our company markets itself as a one-stop shop for custom ferrite. Our employees can get you anything you need, whether it's a new cable harness or a core form that you can't find anywhere else. We promise that your project will always have the best magnetic solution at every stage.

One-Stop OEM Service

Full Service Design

We handle every part of the Magnet (EMI) Cable assembly design process for cable assemblies, from the first ideas to the final paperwork. To meet your needs, our engineers will improve the layout, shielding strategy, and choice of connectors.

Rapid Prototyping

Need a sample right away? We sell prototypes that can be put together quickly. The tests go faster, and you get a working cable in just a few days. By dealing with EMI problems early on, things move along faster.

Scalable Production

We can make anywhere from 100 to 100,000 pieces at a time with our production methods. We can change our processes (like overmolding or hand assembly) to meet your needs, and we keep a close eye on quality.

Quality & Compliance

When it comes to quality and compliance, you can be sure that our work is done in ISO-certified facilities. Every assembly goes through tests for continuity, shielding performance, and other things. With our help and paperwork, you can meet or exceed automotive, UL, CE, or FCC standards.

Your Success, Our Priority

Work with a magnetic cable assembly provider you can trust who listens to what you have to say. To keep your project on track, we put a lot of emphasis on consistent manufacturing and quick engineering turnarounds. Get in touch with us so we can start working together to improve your products and earn your trust.

Cable Assembly Design for EMC Compliance

Our main goal as engineers when making cable assemblies is to make sure they meet all the rules. We use a mix of methods, such as braided or foil shields with ferrite cores, to make sure that all of our cables can pass the CE, FCC, or automobile EMC tests. We take into account proper grounding and shielding of connectors when we use Magnet (EMI) Cable assembly design. Twisted-pair cables are often insulated with metal braid and high-frequency cores are added to them to cut down on electromagnetic interference (EMI) even more. When we choose materials and jacket thickness, we think about how much pollution they will cause. Because of this, there is less need to redo work when getting the cable assembly ready for certification testing. By designing for EMC from the start, you can avoid costly changes and get products ready for the market.

Customer Reviews

These custom cable assemblies dramatically reduced interference in our system. High quality and exactly as designed.

Alice Merguris

Excellent service and engineering. They helped refine our Magnet (EMI) Cable assembly design, and the first samples passed EMC testing.

Maria Salv

As an OEM, I rely on QL for stable supply. Their cables are robust and ship compliant – very happy with the results.

Robert L

Five stars for QL-Custom’s rapid prototyping. The quick turnaround saved our project schedule.

Emma Timberlake

Professional supplier. The integrated magnets in our automotive harnesses fit perfectly and cut noise.

Luis Samsonite

Great partner for large projects. Their one-stop service from design to production is exactly what we needed.

Priya Ghosh

Leading Group for Magnet (EMI) Cable Assembly Design

When you work with QL-Custom Technology Ltd., you get to work with an experienced partner in the field of Magnet (EMI) Cable assembly design. We are a custom magnetic cable assembly manufacturer in China. We have been making wire harnesses and overmolded cables for more than ten years. Our factory's ISO and IATF quality systems make sure that our products are reliable and meet all standards. We know how to put ferrites and magnets into cables in a way that makes them much quieter. Regardless of the quantity you require, QL-Custom can provide you with a custom cable assembly design at a reasonable price and quickly. Contact us today to learn more about why QL-Custom is the best choice for your next magnet. We can help you make your idea for an EMI cable project a reality.