Half Circle Electromagnet Series

Description of working principle
Energizing to generate a magnetic field:
When power is applied, current flows through the coil. According to Faraday's law of electromagnetic induction, a toroidal magnetic field is generated around the coil. The core and rotor (or armature) are magnetized, forming magnets with opposite polarities, thereby generating electromagnetic attraction force.

Magnetic force driving rotation:




When the magnetic field passes through the iron core, the iron core gets magnetized and becomes a strong magnet; the rotor (or armature) is placed in the magnetic field, and its internal magnetic domains are aligned, forming fixed magnetic poles. After both are magnetized, they present opposite polarities (such as N pole - S pole). According to the principle that opposite magnetic poles attract each other, an interacting electromagnetic force is generated.






De-energizing to reset:





Electromagnetic force drives the rotor to rotate, achieving the conversion of electrical energy into mechanical energy.

Dear Valued Customers,
As the 2026 Chinese Spring Festival draws near, we extend our heartfelt gratitude for your long-term trust and support for Ningbo Jianyuan Electric's electromagnet products and services. To ensure the smooth operation of your business during the holiday, we hereby release the detailed arrangements for logistics, delivery, and after-sales service during the holiday period. Please kindly take note to make proper preparations.








1. Spring Festival Holiday Schedule
Based on national statutory holidays and the company's operational needs, the holiday arrangement is as follows:


Holiday Period: February 13, 2026 (the 26th day of the 12th lunar month) to February 23, 2026 (the 7th day of the 1st lunar month)


Official Resumption Date: February 24, 2026 (the 8th day of the 1st lunar month)



2. Electromagnet Product Order & Shipping Schedule
To guarantee the timely delivery of your orders, please pay attention to the following time nodes for order submission and confirmation:


Standard & Customized Electromagnets: Please complete order placement and confirmation by January 15, 2026. We will prioritize production and shipping arrangements. Conventional electromagnets (including magnetic lugs, retaining magnets, rotating magnets, linear solenoids, etc.) will be shipped no later than February 12, 2026.


Custom-Made Special Electromagnets: For customized products such as high-temperature, high-frequency, or back electromotive force (EMF) electromagnets, due to their complex manufacturing and testing processes, please submit detailed technical specifications by January 15, 2026 to ensure sufficient production and inspection time before the holiday.



3. Holiday Shipping Adjustments


February 13 - 23, 2026: All regular electromagnet shipments will be suspended.


Emergency Support: For urgent electromagnet needs in special fields such as medical equipment or scientific research instruments, please contact our on-duty hotline directly. We will do our utmost to coordinate and provide solutions.



4. Post-Holiday Shipping Resumption


Starting from February 24, 2026: Full resumption of production, testing, and shipping of electromagnet products.


Order Processing: All electromagnet orders received during the holiday will be processed in chronological order starting from February 24.



5. Electromagnet-Related Service Arrangements
During the holiday period, the technical support and consultation services for electromagnets will be adjusted as follows:


February 13 - 15, 2026: Online technical consultation services will be available (covering electromagnet selection, application solutions, installation and commissioning guidance, etc.). Please note that there may be a slight delay in response time.


February 16 - 22, 2026: Technical consultation services will be suspended. For urgent issues, you can leave a message through our official channels, and we will prioritize handling them upon resumption of work.



6. Logistics Partner Reminder
Major logistics partners (including air, sea, and land transportation) will have adjusted service hours during the Spring Festival. To avoid project delays caused by logistics disruptions, we strongly recommend you plan the delivery schedule of electromagnet products in advance.



7. Pre-Holiday Inventory Check Reminder
We advise you to check your electromagnet inventory in advance, especially for easily worn components (such as coils and magnetic conductors). Please arrange restocking in a timely manner if there is a shortage to ensure the normal operation of your production during the holiday.



8. 2026 Project Planning Support
For electromagnet application projects scheduled for 2026, please arrange technical consultation before the holiday. We will sort out and process related project requirements in priority order upon resumption of work.

9. Post-Holiday Special Service
We will launch a special service for new projects after the holiday: providing priority production of electromagnet samples through our express prototyping channel to accelerate the progress of your new projects.
Once again, we express our sincere gratitude for your continuous trust and support. As we embrace the Year of the Horse 2026, we look forward to continuing our cooperation and providing you with more stable, efficient, and innovative electromagnetic solutions. Wish you and your team a joyous Spring Festival, prosperous business, and happy family in the new year!

Holding electromagnets are critical components in various industries, used to attract and hold ferromagnetic objects. Understanding the importance of duty cycle in these electromagnets not only extends their lifespan but also maximizes their efficiency. In this article, we delve into the workings of holding electromagnets and detail how proper duty cycle management can significantly impact their durability, specifically focusing on the Jianyuan Solenoid brand.

What is a Holding Electromagnet?Holding electromagnets are electromagnets designed to attract and hold ferromagnetic materials. They are widely used in industries such as automation, transport, and handling, where reliability and precision are paramount. The electromagnet's operation ensures that the ferromagnetic object is firmly held when the coil is energized, and the object falls away once the power is turned off. Importantly, these magnets function efficiently when the piece to be held is in direct contact with the electromagnet's poles, minimizing discrepancies in the magnetic field strength.

Function and Working PrincipleTypes of Electro Holding MagnetsHolding electromagnets are designed into two primary types:

Electromagnet-Type: When the coil is energized, the magnet attracts a steel object. When the current is turned off, the magnet immediately releases the object.Electro-Permanent Magnet-Type: This type uses a permanent magnetic force to hold the workpiece when the coil is off. Energizing the coil neutralizes the permanent magnetic force, releasing the object. Electro-permanent magnets are often preferred for applications requiring reliable holding power even when unpowered.Holding ForceThe holding force of an electromagnet is defined as the maximum force required to remove the ferromagnetic part from the magnetic holding surface of the solenoid. The value of this force is indicated in newtons (N) and is perpendicular to the surface of the solenoid. The maximum force efficiency is achieved when the object is in direct contact with the holding surface, without any significant air gap.

Residual ForceResidual force, or residual holding force, is the force exerted by the holding magnet after the magnetic field associated with the coil or permanent magnet is removed. This force ensures minimal holding strength, typically around 15-30% of the holding force, depending on the material and surface roughness of the workpiece.

ApplicationsElectromagnetic holding magnets are versatile and are utilized in numerous applications, ranging from industrial automation to material handling. These magnets are available in various designs, such as round, flat, and rectangular, to suit different needs. The versatility of holding electromagnets makes them essential in industries requiring precise and reliable holding solutions.

Understanding Duty CycleDuty cycle is the ratio of the time that an electromagnet is energized compared to the total cycle time (ON time / Total time). For example, a duty cycle of 50% means the electromagnet is operational for half of the total cycle time. Understanding the duty cycle is crucial for maintaining the electromagnet's longevity and performance.

Impact of Duty Cycle on LifespanEffects of High Duty CycleA high duty cycle can lead to overheating of the electromagnet, which can degrade its performance and potentially cause failure. Overheating due to continuous operation without adequate cooling time can damage the coil insulation and weaken the magnetic properties. It's crucial to maintain a balance to prevent overheating and ensure the electromagnet operates efficiently.

Effects of Low Duty CycleConversely, a low duty cycle can prevent the electromagnet from reaching its maximum utilization efficiency. While this can extend the lifespan to some extent, it may also lead to waste in terms of operational efficiency and control capabilities. Therefore, it's important to strike a balance between operational efficiency and longevity.

Proper Duty Cycle for Jianyuan Holding ElectromagnetsThe optimal duty cycle for Jianyuan holding electromagnets will vary depending on the specific application and operating conditions. Generally, to prolong the lifespan, it is recommended to operate the electromagnet at a duty cycle between 40% and 60%. This range allows sufficient operational time while providing enough rest periods for cooling.
For instance:
- Jianyuan Solenoid MK-P80/38: This model can operate efficiently with a duty cycle of around 50%, ensuring optimal performance and longevity.
- Neodymium Holding Solenoid MK-P34/18: Recommended duty cycle is approximately 55%, providing a balance between efficiency and service life.
Choosing the right duty cycle ensures that the electromagnet operates within safe limits while delivering reliable performance throughout its lifespan.

Preventing Overheating and FailureCooling TechniquesProper cooling techniques can significantly extend the lifespan of holding electromagnets. Here are some cooling methods:
- Natural Convection: Allow sufficient time between operations for the electromagnet to cool naturally.
- Forced Convection: Utilize fans or airflow systems to enhance cooling efficiency.
- Heat Sinks: Incorporate heat sinks or a cooling jacket to dissipate heat more effectively.

Regular MaintenanceRegular maintenance is essential to ensure the electromagnet operates optimally:
- Inspection: Regularly inspect components, especially the coil, for signs of wear or damage.
- Cleaning: Keep the electromagnet clean and free from dust and debris to prevent overheating.
- Diagnostics: Periodically perform diagnostics to monitor performance and detect any issues early on.

Case Studies and Success StoriesSeveral industries have successfully implemented proper duty cycle management to extend the lifespan of their holding electromagnets. Here are some examples:

Industry Example 1: ManufacturingA manufacturing plant implementing a 50% duty cycle for their Jianyuan holding electromagnets noticed a significant increase in operational efficiency and longevity. Regular maintenance and cooling ensured that the electromagnets operated efficiently, reducing downtime and increasing productivity.

Real-World ApplicationIn a material handling scenario, a logistics company operating with a 60% duty cycle for their Jianyuan electromagnets experienced a 30% reduction in maintenance costs and a 20% increase in operational efficiency. The proper management of duty cycle ensured that the electromagnets remained in service longer, providing ample returns on investment.

ConclusionUnderstanding and managing the duty cycle of holding electromagnets, particularly those from Jianyuan Solenoid, is crucial for maximizing their lifespan and efficiency. By adhering to optimal duty cycles and employing effective cooling and maintenance practices, you can ensure that your holding electromagnets operate reliably and efficiently for a longer period. Proper duty cycle management not only prolongs the electromagnet's lifespan but also maximizes operational efficiency, making it a win-win solution for various applications.

Electromagnets are essential components in numerous industrial applications. They play a crucial role in various processes, from scrap metal recycling to high-temperature environments in foundries. Understanding the nuances of industrial electromagnets can greatly benefit industries looking for more efficient and flexible magnetic solutions. In this article, we'll delve into the intricacies of industrial electromagnets, their historical development, and their specific applications, highlighting the importance of choosing the right electromagnet for your needs.

Basic Understanding of ElectromagnetsAn electromagnet is a type of magnet where the magnetic field is produced by an electric current. Unlike permanent magnets that rely on the intrinsic magnetic properties of their materials, electromagnets generate a magnetic field through the application of electricity. This makes them incredibly versatile and controllable, allowing for easy activation and deactivation as needed.

How Does an Electromagnet Work?Electromagnets commonly consist of a coil made from copper wire wrapped around a ferromagnetic core, such as iron. When an electric current is passed through the wire, it creates a magnetic field that is concentrated along the center of the coil. The presence of a core material improves the magnetic field strength because it provides a lower reluctance path for the magnetic flux. The strength of the magnetic field is directly proportional to the current flowing through the wire and the number of turns in the coil.

Key ComponentsCoil: Made of copper wire that carries the electric current.Core: Often made of ferromagnetic materials like iron or steel, which increases the magnetic field strength.Winding: The coil's turns must be closely packed to maximize the magnetic field.Historical ContextIn 1820, Danish scientist Hans Christian rsted discovered that electric currents create magnetic fields. French scientist Andr-Marie Ampre further demonstrated that iron could be magnetized by inserting it into an electrically fed solenoid. The electromagnet was invented by British scientist William Sturgeon in 1.824. He created a horseshoe-shaped magnet that demonstrated the power of electromagnetism when a current was applied to the copper coil wrapped around the iron.
Joseph Henry improved the design by using insulated wire, allowing for multiple layers of windings, which led to the development of powerful electromagnets. Over time, electromagnets have evolved to become essential components in various industrial applications.

History and DevelopmentEarly InventionsDiscoveries of Electromagnetism: rsted's discovery was a significant breakthrough that set the stage for further innovation.First Electromagnet: William Sturgeon's demonstration of a coil-wrapped horseshoe magnet.Improving DesignsJoseph Henry's Innovations: Systematic improvements in electromagnet design, leading to more powerful and efficient electromagnets.Modern Theories: The magnetic domain theory proposed by French physicist Pierre-Ernest Weiss laid the foundation for deeper understanding.Modern Electromagnet TechnologiesQuantum Mechanical Theories: Contributions by scientists like Werner Heisenberg and Lev Landau in the 1920s.Further Developments: Ongoing innovations in coil geometry, materials, and control systems.Key Applications in Industrial SettingsIndustrial electromagnets have a wide range of applications across various sectors. Below, we'll explore some of the most common uses:

Foundry and Metal ProcessingElectromagnets are widely used in foundries for tasks that require handling and sorting of metallic materials in high-temperature environments. High-temperature resistant electromagnets are specifically designed to function in these challenging conditions. They are made with materials that can withstand extreme temperatures and ensure reliable operation.

Scrap Metal RecyclingHeavy duty industrial electromagnets are vital in the scrap metal recycling industry. These electromagnets are used for lifting, moving, and sorting large amounts of ferrous scrap metal. They are capable of handling heavy loads while providing the necessary strength and durability to operate under varying conditions.
Heavy Duty Industrial Electromagnets for Scrap Metal RecyclingHeavy duty industrial electromagnets are designed to withstand rigorous use and provide reliable performance in scrap metal recycling operations. They are capable of lifting and handling substantial loads, making them indispensable in recycling facilities.
Key Features:- Excavation and Sorting: Used for excavating scrap metal and sorting materials based on size and weight.
- Recycling Efficiency: Highly efficient in separating ferrous from non-ferrous materials.
- Durability: Built to withstand the wear and tear of frequent use.
Use Cases:- Industrial Recycling Plants: Essential in plants where large volumes of scrap metal are processed.
- Construction Sites: Useful at construction sites where heavy metal waste needs to be managed efficiently.
Technical Specifications:- Magnetic Force: Typically ranges from tens of thousands to hundreds of thousands of pounds.
- Operating Voltage and Current: High capacity to ensure consistent and powerful magnetic fields.
- Material Handling Capacity: Handles loads of various sizes and weights, ensuring efficiency in recycling processes.

High-Temperature Resistant Electromagnets for the Foundry IndustryHigh-temperature resistant electromagnets are critical in foundries where metal processing and casting take place. These electromagnets are designed to withstand extreme temperatures and provide consistent magnetic fields in high-temperature environments.
Key Features:- High-Temperature Materials: Made from materials that can withstand temperatures up to 1000C (1832F).
- Efficient Operation: Designed to maintain magnetic strength even under high-temperature conditions.
- Safety and Reliability: Ensuring safe and reliable operations in foundry environments.
Use Cases:- Ferrous Scrap Handling: Critical for sorting and handling ferrous scrap materials in high-temperature operations.
- Metal Casting: Essential in metal casting processes where precise control is required over magnetic fields.
Technical Specifications:- Temperature Resistance: Ranges from 700C to 1000C (1292F to 1832F).
- Operational Stability: Maintains consistent magnetic strength across various temperatures.
- Durability and Reliability: Built to last in harsh industrial environments.

Efficiency and EffectivenessIndustrial electromagnets offer several advantages over traditional permanent magnets in various industries:
- Flexibility: Can be turned on and off easily.
- Adjustability: Strength can be adjusted based on operational needs.
- Durability: Designed to withstand heavy use and harsh conditions.

Benefits in Scrap Metal RecyclingImproved Efficiency: Heavy duty electromagnets increase sorting efficiency and reduce labor costs.High Throughput: Can handle large volumes of scrap metal with ease.Benefits in FoundriesPrecision Handling: High-temperature resistant electromagnets provide precise handling capabilities.Enhanced Reliability: Ensures continuous operation in high-temperature conditions.Choosing the Right ElectromagnetSelecting the right electromagnet depends on several factors:
- Application Requirements: Specific needs of the operation, such as lifting capacity and temperature resistance.
- Work Environment: Operating conditions, including temperature and material handling needs.
- Budgery and Cost: Budget constraints and investment considerations.

Additional TipsConsult Professionals: Work with experts to ensure the best fit for your operation.Testing and Prototyping: Consider testing electromagnets in a controlled environment before full-scale implementation.ConclusionIndustrial electromagnets are pivotal in modern industries dealing with metal processing, recycling, and foundry operations. Their ability to adapt to different conditions and provide reliable performance makes them invaluable tools. For industries like scrap metal recycling, heavy duty electromagnets ensure efficient and effective handling of loads. In the foundry industry, high-temperature resistant electromagnets are crucial for precision and reliability. When selecting industrial electromagnets, careful considerations based on specific needs and operating conditions are essential.
Jianyuan Solenoid offers top-quality electromagnets designed with advanced technology and materials to meet the demands of industrial settings. With a focus on strength, durability, and efficiency, Jianyuan Solenoid's electromagnets are your go-to solution for high-performance industrial applications.