What Are Curved Sliding Doors?

A curved sliding door is an automatic door closing system in which the panels move along a curved path instead of a straight line. This design allows the door leaf to integrate into the entrance lining itself, making it practically invisible when open and eliminating the need for lateral parking space.

From a technical perspective, this type of door requires a curved guiding system, low-noise motors and, above all, an electromagnetic locking and holding mechanism capable of keeping the leaf firmly in place when closed or releasing it quickly when triggered by the control system.

How Do Locking Systems Work in Curved Automatic Doors?

The mechanism of a curved sliding door integrates several subsystems that must coordinate precisely: motor drive, presence detection system, and electromagnetic locking. The latter is responsible for ensuring the door remains locked when it should not open and releases immediately in response to an authorized signal or emergency.

The electromagnets used in these installations operate in two main ways. Fail-safe systems release the door in the event of a power failure, making them mandatory for evacuation routes. Fail-secure systems maintain locking even without power, making them suitable for restricted access points where intrusion security is a priority.

In addition, electromagnets for curved sliding doors must meet additional requirements compared to linear doors: the holding force must be applied precisely to a contact surface that varies with the panel curvature, and the response time must remain consistent with the door leaf movement speed.

Advantages of Curved Sliding Doors Compared to Standard Automatic Doors

• Building Energy Efficiency

The curved design significantly reduces thermal losses during opening. By opening at a smaller angle and with less exposure time to the outside, curved sliding doors help maintain indoor temperature, which is especially relevant in hospitals, hotels, and energy-certified buildings.

• Entrance Space Optimization

Curved sliding doors make it possible to reduce the opening width by up to 40% compared to a linear sliding door with equivalent performance. This is particularly important in existing building renovations, where opening width is a limiting factor, or in environments where passage space must coexist with elements such as turnstiles, masonry, or signage.

• Architectural Integration

The curved panel trajectory allows the door to be embedded into the side lining of the entrance, delivering a visually clean result without protruding elements. This factor is especially valuable in hotel, airport, and corporate building projects where entrance aesthetics are part of the space’s identity.

• People Flow

Curved sliding doors maintain greater clear passage during partial opening than telescopic or swing doors, supporting continuous movement in high-traffic environments without creating bottlenecks.

Where Can We Find This Type of Sliding Door?

• Hotels and Hospitality Establishments

At hotel entrances, curved sliding doors provide wide, quiet access that enhances the guest experience from the very first moment. Integrated electromagnetic locking systems ensure the door remains secured outside operating hours or when required by the control system, without becoming an obstacle during evacuation.

• Airports and Transport Terminals

In terminals with high passenger traffic and constant opening cycles, electromagnets must withstand tens of thousands of cycles without functional degradation. Fail-safe systems are mandatory in evacuation areas, and integration with terminal access control systems is a standard requirement.

• Hospitals and Healthcare Facilities

In hospital environments, curved sliding doors allow stretchers and wheelchairs to pass without reducing the available net opening. Electromagnetic locking systems must be designed for immediate opening in the event of a fire alarm and to operate under controlled temperature and humidity conditions.

• Corporate Buildings and Shopping Centers

At the main entrances of office buildings and shopping centers, electromagnetic locking integrates with access control systems, building management systems (BMS), and alarms, enabling real-time door status monitoring and differentiated zone access management.

What Type of Electromagnet Is Used in a Curved Sliding Door?

Locking systems for curved sliding doors mainly use linear electromagnets, electromagnetic door holders, or linear electromagnetic bolts. The choice depends on the level of security required: Nafsa’s linear electromagnets are ideal for instantly releasing the locking mechanism, as their response speed allows the door to open without delay. Meanwhile, the VEM Series electromagnetic door holders are suitable for fail-safe installations, while the VM/ND Series model or the CU20/CP safety lock are used in applications where the door must remain locked even without electrical power.

Curved sliding doors offer technical and architectural advantages that justify their use in demanding environments: reduced opening space, improved building energy efficiency, and seamless visual integration into the entrance. For these systems to operate safely and reliably, the electromagnetic locking system is a critical component that must be selected according to clear technical criteria.

NAFSA has extensive experience in the design and manufacture of electromagnets for door automation systems, offering both standard solutions and custom developments tailored to the specific requirements of each project. If you are working on a curved automatic door installation and need technical advice regarding the locking system, you can contact our team to analyze your project requirements.

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This type of door is widely standardized in sectors such as hospitals, supermarkets, shopping centers, and airports, where ease of access, fast passage, and system reliability are essential requirements. Within this system, solenoids play a key role.

How does an automatic telescopic door work?

A telescopic door consists of three or more panels that slide in a coordinated manner along an upper rail. When the opening mechanism is activated, the panels retract over one another into a compact space, creating a wide and smooth passageway. When closing, the panels extend again until the doorway is completely sealed.

This precise and repetitive movement requires electromechanical components that guarantee both the correct positioning of the panels and the safety of the system under any circumstance. Solenoids are responsible for activating the locking, holding, and closing mechanisms during each operating cycle.

The role of solenoids in telescopic doors

In an automatic telescopic door, solenoids can operate at different points within the system:

• Locking and holding mechanisms: once the door reaches the closed position, the solenoid keeps the panels fixed in place, preventing unwanted openings. This function is especially important in healthcare environments or controlled-access areas.
• Automatic opening and closing systems: solenoids activate the mechanisms that coordinate panel movement, ensuring that each panel moves at the correct time and at the proper speed.
• Integration with access control systems: in installations where the telescopic door serves as a security barrier, solenoids are integrated with card readers, biometric sensors, or home automation systems to control who can access the area and when.
• Safety in the event of power failures: depending on the type of installation, fail-safe solenoids can be used, which automatically release the door during a power outage to guarantee evacuation; or fail-secure solenoids, which maintain the lock to protect access.

Advantages of solenoids in telescopic doors

Solenoids offer a series of advantages that make them the ideal solution for this type of automatic door. First of all, their compact design allows them to be integrated easily into mechanisms with limited space, which is especially relevant in installations where the panels must stack within a very narrow margin.

In addition, since they do not include extra moving parts, they provide high durability and minimal maintenance, reducing long-term operating costs. Their fast response ensures that every opening and closing cycle is carried out with precision, even in high-traffic environments such as hospital or supermarket entrances.

Finally, the possibility of integrating them with electronic control systems allows access to be managed remotely, automatically, and securely.

Recommended solenoids for telescopic doors

At NAFSA, we manufacture solenoids specifically designed for automatic door locking systems:

• ER Series: Single-acting linear solenoids. When voltage is applied, the solenoid performs the stroke, and when the voltage stops, it returns to its initial position using the built-in spring or external forces. This is a versatile and highly customizable component depending on the customer’s requirements. 
• ERC Series: High-performance solenoids. They perform the same function as linear solenoids but feature self-lubricating Teflon guides to guarantee maximum service life. Fully customizable reference.  
• CU20/CP: single-acting linear solenoid with reinforced shaft guide, designed to guarantee secure door locking under radial loads. 

At NAFSA, we have extensive experience in the design and manufacture of solenoids for door locking systems in all types of installations. If you need a solution adapted to the specific characteristics of your project, our technical team is available to advise you and develop the electromagnetic component that best suits your needs.

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What are electromagnets for sliding doors?

Electromagnets generate a magnetic field when they receive electrical current. In the case of sliding doors, this principle is mainly applied to keep the door locked in the closed position, release the lock in a controlled manner when the corresponding signal is received, and integrate with automation and access control systems.

Advantages of electromagnets in sliding door locking systems

Electromagnets offer a series of advantages over other mechanical locking systems:

• Guaranteed security: they keep the door closed with constant force until an electrical opening signal is received, which is especially important in installations with access control or restricted areas.
• Integration with automated systems: they can be easily connected to access control systems, presence detectors, alarms, and industrial automation, making them an ideal solution for intelligent sliding doors.
• Reliability and long service life: with fewer mechanical components subject to wear, electromagnets provide greater durability and consistent performance even in high-use environments.
• Fast and precise response: electromagnetic actuation allows very short response times, essential for high-traffic automatic doors.

Types of electromagnets for sliding doors

Choosing the right electromagnet will depend on the type of installation and the security requirements of each project.

Linear electromagnets are the most commonly used system in these cases. They keep the mechanism closed or open depending on the need. When activated, the electromagnet releases the system, allowing the door to open or close.

Linear electromagnets, such as the CU20/CP, are used when a locking or latching function is required, as they can absorb lateral forces without damaging the guide. They actuate internal components with high precision, making them very useful in automated doors with specific technical requirements.

In many industrial or high-security projects, the best option is to develop custom solutions that combine different types of electromagnets according to the specific needs of the installation.

What factors should be considered when choosing an electromagnet for sliding doors?

To ensure proper system operation, it is important to consider the holding force required by the mechanism, the type of operation needed (fail-safe or fail-secure), frequency of use, environmental conditions (temperature, humidity, presence of dust), and compatibility with the existing automation system. Choosing the right electromagnet not only improves door performance but also increases safety and reduces maintenance costs.

At NAFSA, we design and manufacture electromagnets for sliding door locking systems, adapting to the specific needs of each project and installation. In addition to our standard range, we offer custom manufacturing options, developing tailored solutions that ensure perfect integration and optimal performance in any environment.

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In applications where the vertical transport of loads or people requires precise control, solenoids provide a robust solution capable of withstanding intensive duty cycles and demanding industrial conditions.

The role of solenoids in elevators and freight lifts

In industrial lifting systems, solenoids are used to actuate or control various key mechanisms of the equipment.

Their most common applications include:

• Door opening and closing systems
• Locking and safety mechanisms
• Activation of electromagnetic brakes
• Speed limiters
• Control systems for lifting platforms

Advantages of solenoids in lifting systems

The use of solenoids in industrial elevators and freight lifts provides several technical advantages:

• Operational safety: they allow immediate activation of locking or braking mechanisms.
• High reliability: they are designed to operate with repetitive cycles in industrial environments.
• Fast response: electromagnetic actuation enables mechanisms to be activated within milliseconds.
• Easy integration: their compact design facilitates installation in different lifting systems.

Industrial solenoids for lifting systems

Manufacturers of elevators and lifting equipment require components capable of delivering mechanical performance, durability, and operational stability.

The development of solenoids adapted to each lifting system helps improve overall equipment performance and ensures safe long-term operation.

Each lifting system has specific technical requirements in terms of actuation force, size, electrical consumption, and duty cycles. Therefore, the design of customized solutions is key to ensuring optimal equipment performance.

At NAFSA, we have extensive experience in the design and manufacturing of industrial solenoids, developing electromagnetic devices tailored to the needs of each client and application.

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In this context, actuation solenoids play an important role. They are small electromagnetic components that enable the activation and locking of different mechanisms within the machine, ensuring that the dispensing process is carried out correctly.

At NAFSA, we design and manufacture solenoids for vending machines, developing components adapted to the most modern vending machinery to deliver fast and precise operation.

The role of solenoids in vending machines

Vending machines are automated systems that integrate different mechanical and electronic mechanisms. For each process to run in a synchronized way, it is necessary to use actuation devices capable of responding quickly and reliably.

Solenoids perform multiple functions within the machine, such as:

• Activating product release mechanisms
• Controlling locking or safety systems
• Operating lifting or displacement mechanisms
• Activating coin change or return systems
• Controlling automatic dispensers

Different applications of solenoids in the vending sector

Solenoids and electromagnetic components are integrated into different types of automatic machines and self-service devices. Their most common applications include:

• 24h vending machines
• Tobacco and beverage machines
• Gaming and amusement machines
• Product lifting systems
• Change machines
• Fuel station dispensers
• Parking meters

Solenoids for vending machines

At NAFSA, we develop actuation solenoids tailored to the needs of vending machine manufacturers, integrating electromagnetic solutions that ensure precision, durability, and ease of system integration.

Among the most widely used solutions in this sector are:

• ER Series – single-acting linear solenoids that can include an optional return spring, suitable for multiple activation mechanisms within the machine.

• ERC Series – open-frame linear solenoids with high mechanical performance, designed for applications requiring greater power or demanding duty cycles.

• CU Series – square-design linear solenoids with high mechanical performance and IP40 protection rating, suitable for industrial applications and automated systems.

Advantages of using solenoids in vending systems

Solenoids offer several key advantages in vending machine design:

• Fast response: they enable immediate actuation of mechanisms, essential for ensuring a smooth purchasing experience.
• High reliability: robust devices capable of withstanding repetitive operating cycles.
• Easy integration: their compact design facilitates integration into automated machinery.
• Low maintenance: with few moving parts, they offer a long service life.

Custom electromagnetic solutions for the vending sector

Each vending machine manufacturer has specific requirements in terms of force, size, energy consumption, or duty cycles. Therefore, developing customized electromagnetic solutions is key to optimizing equipment performance.

At NAFSA, we have extensive experience in the design and manufacture of solenoids for different industrial sectors, developing components tailored to the technical needs of each application.

Thanks to our technical department and specialized manufacturing processes, we can offer electromagnetic solutions that help improve the reliability and efficiency of vending machines.
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Why are solenoids essential in packaging?

Packaging and filling systems require fast, repetitive, and reliable movements. Solenoids perform perfectly in situations where:

• Precision and control: solenoids can activate mechanisms, align parts, or operate closures at the exact moment, reducing errors and improving the quality of the packaging process.
• Adaptation to automated processes: these devices integrate easily into automatic lines, acting as holding components without the need for complex additional mechanical systems.
• Better performance and lower maintenance: by not relying on many traditional mechanical elements, wear is reduced, and maintenance downtime is minimized.
• Speed: solenoids operate in milliseconds, enabling high-intensity repetitive tasks.

Where can solenoids be found in the packaging industry?

● Container and lid closure: in automatic filling machines, linear solenoids actuate mechanisms that close lids or secure seals quickly and accurately, ensuring uniform and safe results every cycle.

● Product holding and positioning: handling products on conveyor belts or transition zones requires precision. Solenoids temporarily secure metallic elements for correct orientation before final packaging.

● Packaging film perforation: solenoids act rapidly to perforate packaging films found in countless consumer products.

● Integration with automatic systems: their compatibility with PLCs (programmable controllers) and industrial control systems allows solenoids to integrate seamlessly into robotic and automated lines, helping reduce time and errors. This is especially valuable in high-production or variable-demand sectors.

Benefits for your packaging line

Solenoids improve productivity by performing repetitive movements and reducing cycle times. They ensure consistent quality thanks to their precision, making every package compliant with established standards. They lower operational costs by reducing manual intervention and extending the life of mechanical components. Finally, they offer flexibility to adapt to different product formats with minimal adjustments.

What to consider when choosing a solenoid for packaging?

When selecting the right electromagnetic solution, it is important to consider:

• Pull force: according to the weight and type of part or container to be held.
• Type of mechanism: linear, bistable, or spring-return, depending on the function in the line.
• Electrical and control integration: compatibility with existing automation systems.
• Speed: depending on stroke and size.

At NAFSA Solenoids, we design and manufacture custom solutions for industries that demand precision, performance, and reliability.

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How do solenoids act in this selection and separation process?

Linear solenoids are devices that, when voltage is applied, operate with a linear motion that allows a mechanism to be actuated, pulling or pushing a cam that selects the corresponding material. Unlike permanent magnets, solenoids offer controlled linear movement, making selection more effective and allowing them to be activated or deactivated as required.

Applications in selection and separation lines

Solenoids are essential in multiple industrial processes:

• Material separation and recycling: they separate the corresponding material (plastic, glass, cans, etc.) through linear movement, directing each material to its appropriate location.
• Food industry: they ensure the selection of fruits, vegetables, and other products at each identification and sorting stage, guaranteeing quality standards.
• Industrial production lines: they enable the automation of part separation, optimizing time and reducing manual intervention.
• Parcel handling: they separate and classify boxes or packages so they reach their correct destination.

Advantages of solenoids in selection and separation processes

1. Precision and control: electrical activation and deactivation allows magnetic force to be adjusted according to process needs.
2. Higher efficiency: they allow large volumes of material to be separated in less time, optimizing production.
3. Operational safety: they reduce manual intervention and the risk of accidents when handling heavy or contaminated materials.
4. Versatility: they adapt to different machine sizes, material types, and industrial environments.
5. Speed: solenoids operate within just a few milliseconds.

Reliable solutions for your industry

At NAFSA Solenoids, we develop solenoids designed to withstand the most demanding environments and improve the efficiency of your selection and separation machinery. Our experience allows us to offer equipment that combines strength, durability, and adaptability, ensuring that every industrial process operates faster, safer, and more reliably.

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What are electromagnetic lifting magnets?

Electromagnetic lifting magnets are devices that combine the attractive force of a magnet with a mechanical holding system, allowing the lifting, moving, and fixing of metallic loads quickly, safely, and efficiently. Unlike traditional methods such as straps or hooks, electromagnetic lifting magnets do not require perforations or additional fasteners, minimizing the risk of damage to materials.

Applications in transportation and logistics

In the logistics industry, handling heavy and bulky materials is a constant challenge. This is where electromagnetic lifting magnets stand out:

• Loading and unloading containers and trucks: allow quickly securing metallic loads without the need for additional equipment, speeding up workflow.
• Warehouse storage and handling: make it easier to place and retrieve materials on shelves, optimizing space and reducing physical effort.
• Safe transport of metal parts: prevent slides and unwanted movement during transport, ensuring the integrity of both the load and personnel.
• Integration into automated systems: they are compatible with cranes and automatic conveyors, contributing to the automation of logistics processes.

Key advantages of electromagnetic lifting magnets

1. Efficiency and speed: Significantly reduce handling times, allowing for shorter loading and unloading cycles.
2. Safety: Lower the risk of workplace accidents by providing a firm and stable grip on metallic loads.
3. Versatility: Adapt to different sizes, shapes, and weights of metallic materials, from steel plates to complex structures.
4. Cost savings: By reducing the need for auxiliary equipment and minimizing material damage, they represent an investment that translates into mid‑ and long‑term savings.

At NAFSA Electroimanes, we offer electromagnetic lifting magnet solutions designed to withstand the demands of modern transportation and logistics. Our equipment combines strength, safety, and durability, adapting to your specific needs to maximize your company’s operational efficiency.
If you are looking to optimize your metallic load handling processes and reduce risks in your logistics operation, electromagnetic lifting magnets are the ideal solution. Trust NAFSA Electroimanes to implement technology that drives your productivity and safety.

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What is the VM/ND Series?

The magnetic holders of the VM/ND series are circular devices that include neodymium magnets. Thanks to this integration, they offer a very high attraction force, making them an ideal option for powerful and secure locking systems.

These magnetic and electromagnetic holders are especially suited for applications where short disconnection pulses may occur — that is, scenarios in which the door must remain securely closed during brief intervals when the system temporarily cuts electrical current.

Where can you find these magnetic holders?

The VM/ND series electromagnets can be used in a wide variety of door closures and mechanisms, making them very versatile:

• Sliding doors
• Fire or fire-rated doors
• Emergency exits or evacuation access points
• Automatic doors
• Doors in industrial facilities

These electromagnets can also be used for door locking on emergency exits, general access locations, or panic locks, as they ensure a high level of holding even under considerable forces.

Advantages of choosing the VM/ND Series

• High magnetic force: thanks to the neodymium magnets, the attraction is very strong, ensuring a firm lock.
• Reliability during brief power interruptions: ideal for installations where disconnection pulses may occur, keeping the door closed when needed.
• Versatility of use: suitable for different door types (sliding, automatic, fire-rated, emergency exits, etc.), making it a multipurpose solution.
• Adaptability: as a manufacturer, NAFSA can offer customized versions according to client requirements, whether for an office building, industrial facility, or special project.

Why trust NAFSA?

Our track record is built on experience, quality, and adaptability. We design and manufacture our own electromagnets and are certified under the ISO 9001:2015 standard.

Thanks to this, we can support the customer from selecting the right model to installation and commissioning, ensuring the solution fits the environment perfectly.

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What are solenoid actuators for distribution switchgear?

Solenoid actuators for electrical distribution switchgears are electromagnetic devices integrated into the safety systems of medium and high-voltage installations. Their main function is to act as an automatic shutdown mechanism when the system detects any anomaly that may compromise the safety of the installation or personnel.

Unlike other passive protection systems, solenoid actuators provide an active and immediate response in risk situations, becoming the first line of defense against electrical failures, overloads, or any other abnormal condition.

How do solenoid actuators work in electrical distribution systems?

The operation of these solenoid actuators is very simple: when the switchgear monitoring and control systems detect an anomaly—whether it is an overload, a short circuit, a ground fault, or any other parameter outside normal values—they send an electrical signal to the solenoid.

This signal activates the solenoid immediately and, in turn, triggers the shutdown mechanism of the distribution cell. This process occurs in milliseconds, stopping the operation of the switchgear before the anomaly can cause further damage to the installation or pose a danger to people.

Response speed is one of the most important factors in these systems, as in medium and high-voltage installations, every second can make the difference between a minor incident and a serious accident.

Solenoid actuators in primary and secondary switchgear

Solenoid actuators for distribution switchgear can be found in different electrical installations:

• Primary distribution switchgear

In primary distribution networks, where high voltages are handled, solenoid actuators must meet very specific technical requirements. These installations require devices capable of withstanding harsh environmental conditions and providing reliable performance for years with minimal maintenance.

• Secondary distribution switchgear

Secondary distribution switchgear, although operating at lower voltages, also requires equally reliable protection systems. The solenoid actuators used in these cases are designed to integrate with the different types of modular switchgear on the market.

• Customized configurations

Every electrical installation has its specific characteristics, and at Nafsa we understand that there is no one-size-fits-all solution. That is why we offer multiple versions of solenoid actuators that can be adapted to virtually any type of distribution switchgear, regardless of the manufacturer or the specific design of the installation.

Why choose NAFSA?

Solenoid actuators for distribution switchgear are a safety investment that pays off from day one. Their ability to prevent accidents, protect equipment, and ensure the continuity of electric supply makes them essential components in any modern medium or high-voltage installation.

At Nafsa we have extensive experience in the development and manufacturing of solenoid actuators for industrial electrical applications. Our technical team is available to advise you on the selection of the most suitable actuator for your specific project, ensuring a solution perfectly adapted to your needs.

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