Inductance Coil

Today, with electronic devices becoming increasingly sophisticated and diverse, standard-sized air-core coils often fail to meet the demands of specific scenarios. Customization has thus become the choice of more and more enterprises. The customization process of hollow coils involves multiple steps, each of which requires professional technical support and rigorous operation to ensure that the final product meets the design requirements. This article will provide a detailed analysis of the customization process of air-core coils and introduce the practice of Pugu Electromechanical Technology (Suzhou) Co., Ltd. in customization services.

I. Demand Communication: Clarify the core elements of customization

The customization process begins with in-depth communication of requirements, which is the foundation for ensuring that the customized product meets expectations. At this stage, the customer and the manufacturer need to have a detailed exchange on the various parameters and application scenarios of the air-core coil.

The information that the customer needs to provide includes but is not limited to: the application fields of the coil, such as communication equipment, medical instruments, industrial control systems, etc. Specific electrical parameters, such as inductance range, rated current, upper limit value of DC resistance, operating frequency, etc. Physical size restrictions, such as outer diameter, inner diameter, length, etc. Environmental adaptability requirements, such as the working temperature range, humidity, vibration, shock and other conditions; And special requirements, such as insulation grade, lead length, interface type, and whether shielding is needed, etc.

For instance, if a customer needs to customize air-core coils for a certain high-frequency communication module, it is necessary to clearly specify that the operating frequency of the module is between 500MHz and 2GHz, the inductance requirement is within the range of 10nH to 100 Nh, the rated current is no less than 500mA, and the coil length needs to be controlled within 10mm to adapt to the miniaturized design of the module. At the same time, it is necessary to inform that the working environment temperature of the coil is between -40 ℃ and 85℃ to ensure that the manufacturer selects the appropriate materials and processes.

The technical personnel of the manufacturer will conduct professional analysis based on the information provided by the customer to confirm the rationality of the parameters. If the parameters proposed by the customer are contradictory, such as requiring an overly large inductance in a smaller size, the technicians will offer adjustment suggestions, combining the coil design principle to strike a balance between the size and the inductance. In addition, technicians will also ask customers if there are any relevant industry standards or certification requirements. For instance, medical equipment may need to comply with the ISO 13485 standard, and industrial equipment may need to obtain CE certification, etc., in order to meet these requirements in subsequent processes.

Ii. Scheme Design: Transform requirements into technical parameters

After clarifying the customer's requirements, the manufacturer enters the solution design stage, transforming the customer's demands into specific technical solutions. This stage requires the integration of electromagnetic theory, material properties and production processes for meticulous design.

The technical team will design the coil structure based on the parameters such as inductance, size and frequency provided by the customer, with the help of professional simulation software. Simulation software can simulate the performance of coils under different winding methods, wire diameters, and turns, predict parameters such as inductance, Q value, and distributed capacitance, and thereby optimize the design scheme. For instance, in high-frequency application scenarios, thinner wires are adopted and the number of turns is increased during the design process. At the same time, the arrangement of the coils is optimized to reduce distributed capacitance and thereby enhance the Q value. For scenarios with high current, thicker wires will be chosen to reduce the DC resistance and avoid excessive heat generation.

Material selection is an important part of the scheme design. The material and specification of the wire need to be determined based on the rated current, operating frequency and environmental requirements. High-purity copper wire is a common choice. If high-frequency loss resistance is required, silver-plated copper wire can be selected. If the environment is corrosive, nickel-plated copper wire can be considered. Insulating materials need to match the working temperature and insulation grade. For instance, polyimide enameled wire with a temperature resistance of 155℃ is suitable for high-temperature environments. If there is a frame, it should be made of non-magnetic materials with high strength and good dielectric properties, such as PPS, LCP and other engineering plastics, to ensure that it does not deform during use.

After the scheme design is completed, the manufacturer will provide the customer with a detailed design plan, including the structural drawings of the coil, material list, performance parameter prediction, production process description, etc., and confirm with the customer. If the client has any suggestions for modifying the plan, the technical team will make adjustments based on the feedback until both parties reach an agreement.

Iii. Sample Preparation: Verify the feasibility of the design

After the plan is confirmed, the sample-making stage begins. The aim is to verify the feasibility of the design plan through physical objects, promptly identify problems and make adjustments.

Sample production will be strictly carried out in accordance with the design plan, and materials and processes consistent with those used in mass production will be selected. The winding process employs high-precision automated winding equipment to ensure accurate turns, neat arrangement, and uniform wire tension. If the coil has leads, a precise welding process will be adopted during welding to ensure that the connection between the leads and the coil is firm and the conductivity is good. At the same time, the size of the weld points will be controlled to avoid affecting the overall size of the coil. For coils with insulation requirements, impregnation or coating treatment will be carried out. Insulating materials that meet the requirements will be selected, and the thickness of the impregnation and the drying temperature will be strictly controlled.

After the sample is made, the manufacturer will conduct a comprehensive inspection of the sample. The inspection items include inductance (at the specified frequency), DC resistance, Q value, insulation resistance, withstand voltage, dimensional accuracy, etc., and submit the inspection report to the customer. For instance, a vector network analyzer is used to measure the inductance and Q value of the sample at the operating frequency, an insulation resistance tester is employed to test the insulation performance, and a caliper is employed to measure whether the dimensions meet the design requirements.

After receiving the samples, the customer will conduct an installation test to verify the performance of the samples in the actual equipment. If problems are found in the sample during the test, such as inductance deviation causing the equipment performance to fail to meet the standards, or the size being too large for installation, the customer will report the issue to the manufacturer. The technical personnel of the manufacturer will analyze the causes of the problems. For instance, the deviation of inductance may be due to the error in the number of turns of the winding or the difference in material properties, and the size issue may be caused by improper control of the welding process. Then, they will modify the design or adjust the process in a targeted manner, and remake the samples until they meet the customer's installation requirements.

Iv. Contract Signing and Pre-production Preparation

After the sample is confirmed by the customer, both parties enter the contract signing stage to clarify the details of cooperation and prepare for mass production.

The contract content includes product specifications (subject to the final confirmed sample parameters), production quantity, delivery cycle, unit price, payment method, quality standards, acceptance methods, after-sales service terms, etc. For projects with special requirements, such as confidentiality clauses (for customized products in the military or high-end medical fields) and the supply of spare parts, they will also be clearly stipulated in the contract.

After signing the contract, the manufacturer begins the pre-production preparation work. The purchasing department buys raw materials based on the material list and conducts incoming inspection on the raw materials to ensure they meet quality standards. The production department will formulate a detailed production plan, arrange production equipment and personnel, and adjust the parameters of equipment such as winding machines and welding machines to ensure they are consistent with those during sample production. The quality department will formulate targeted inspection plans, clearly defining the inspection standards and methods for each process, such as random checks on the number of turns after winding, conduction tests after welding, and full-item inspections of finished products.

If the production quantity is large or the product process is complex, the manufacturer may conduct a small-scale trial production to verify the stability of the production process. The trial production products will undergo comprehensive testing. If the pass rate meets expectations, large-scale production will be initiated. If any problems are found, adjust the production parameters in time to avoid quality fluctuations during large-scale production.

V. Mass Production and Quality Control

The mass production stage is the process of transforming design plans into large-scale products, which requires strict quality control to ensure the consistency and reliability of the products.

During the production process, each procedure has clear operation norms and inspection standards. The winding process is completed by automated equipment, which records parameters such as the number of winding turns and tension in real time. Operators conduct regular inspections to ensure the normal operation of the equipment. The welding process adopts automated welding equipment to control the welding temperature and time, avoiding false welding and false welding. After welding, a 100% conduction test is conducted. For coils that require varnishing, an automated varnishing production line is adopted to control the varnishing concentration, time and drying temperature, ensuring that the insulation layer is uniform and firm.

Online detection is an important means of quality control. During the production process, multiple detection nodes are set up, such as the initial measurement of the number of turns and inductance after winding, the detection of conductivity and DC resistance after welding, and the full performance test after the finished product. The inspection data will be recorded in real time to form a traceable quality file. For non-conforming products, they will be marked, isolated, the causes analyzed, and corrective measures taken to prevent similar problems from recurring.

After production is completed, the manufacturer will conduct sampling tests on the finished products. The sampling ratio is determined based on the batch size and quality requirements, generally ranging from 1% to 5%. The items for sampling inspection are consistent with those for sample inspection. If the inspection results meet the requirements, the products can be stored in the warehouse for shipment. If any non-conformities are found, the sampling scope will be expanded. If necessary, a full inspection will be conducted to ensure that all delivered products are qualified.

Vi. Delivery and After-sales Service

After the product is completed and passes the inspection, it enters the delivery stage. The manufacturer will deliver the product to the customer's designated location at the time and in the manner stipulated in the contract.

Before delivery, the products will be properly packaged. Appropriate packaging materials, such as anti-static bags, foam boxes, and cartons, will be selected based on the product characteristics and transportation distance to prevent damage caused by vibration and compression during transportation. The packaging will be marked with information such as the product model, quantity, batch number and production date, which is convenient for customers to receive and trace. The logistics method is selected according to the customer's needs, such as express delivery, dedicated logistics lines, air freight, etc. The manufacturer will track the logistics information to ensure the products are delivered on time.

After-sales service is a continuation of the customized process, providing customers with usage guarantees. The manufacturer will provide the customer with a product user manual, including installation precautions, storage conditions, and handling of common problems, etc. If customers encounter problems during installation or use, such as changes in inductance after coil installation or abnormal noises, they can contact the technical support team of the manufacturer. Technicians will provide solutions through phone calls, emails or on-site services.

For bulk products, the manufacturer will provide a certain period of quality guarantee. If quality problems caused by non-human factors occur within the warranty period, returns, exchanges or repairs will be made in accordance with the contract. Meanwhile, manufacturers will collect customers' usage feedback to optimize subsequent design and production, and continuously improve product quality.

Vii. Customized Service Practice of Pugu Electromechanical Technology (Suzhou) Co., LTD

Pugu Electromechanical Technology (Suzhou) Co., Ltd. has accumulated rich experience in the customization of air-core coils, and its customization process reflects professionalism and rigor.

During the requirements communication stage, the company's technical personnel will proactively delve into the customer's application scenarios and, based on their own industry experience, provide parameter suggestions to the customer. For instance, in response to the customized requirements of a certain medical monitoring equipment manufacturer, technicians found that the inductance parameters proposed by the customer did not take into account the high-frequency interference environment of the equipment. They suggested appropriately adjusting the inductance and adding shielding design, which ultimately enhanced the anti-interference capability of the equipment.

In the scheme design stage, the company, relying on its professional R&D team and simulation tools, can quickly respond to complex customized demands. We once customized a high-temperature resistant air-core coil for an industrial automation client, which was required to operate stably in an environment of 125℃, with an inductance deviation not exceeding ±5%. The R&D team selected polyimide enameled wire with a temperature resistance of 200℃ and PPS skeleton, and optimized the winding process, enabling the sample to pass the customer's test in one go.

During the sample making and mass production process, the company strictly implements the quality control procedures and is equipped with multiple high-precision testing devices to ensure the consistency of each batch of products. For customers with urgent needs, the company will initiate an expedited process, coordinate production resources and shorten the delivery cycle. In terms of after-sales service, the company has established a rapid response mechanism. Technicians will reply to customer inquiries within 24 hours and provide professional solutions.

The customization process of hollow coils is a systematic process from demand to product, including demand communication, scheme design, sample production, contract signing, mass production, delivery and after-sales service, etc. Each link requires professional technical support and rigorous operation. A scientific and standardized customization process can ensure that the final product meets the specific needs of customers and provide a guarantee for the stable operation of the equipment.

Pugu Electromechanical Technology (Suzhou) Co., Ltd. has established a good reputation in the field of hollow coil customization through a complete customization process and professional services, providing reliable customization solutions for customers in different industries. As the requirements for air-core coils in electronic devices continue to rise, the customization process will also be constantly optimized, integrating more intelligent and digital means to enhance customization efficiency and product quality, and promote the application of air-core coils in a wider range of fields. If you have customization requirements for hollow coils, you can refer to the above process to communicate with the manufacturer to ensure a smooth and efficient customization process and obtain a satisfactory product.