Coils for Solenoids & Latching Devices
Electromagnetic Coils for Solenoid & Latching Applications
Anstee Coil Technology designs and manufactures high-reliability electromagnetic coils for solenoids and bistable latching devices.
We specialise exclusively in custom coil component manufacturing, fine-gauge bobbin winding, and self-bonding coil sub-assemblies for OEMs – we do not manufacture or supply finished valve bodies, linear actuators, or complete locking mechanisms.
Supplying customers globally, our coils power critical switching, locking, and fluid control functions across access control, automotive, aerospace, medical, and industrial automation sectors. Whether for high-frequency continuous duty or energy-efficient magnetic latching, our coils deliver repeatable electromagnetic force and long service life.
Solenoid & Latching Device Coil Winding Expertise
Solenoid actuation and magnetic latching place rigorous demands on coil symmetry, flux density, insulation integrity, and heat dissipation.
We manufacture fine-gauge bobbin-wound coils, self-supporting air-core windings, and heat-bonded heavy-duty coils to meet precise mechanical and electrical specifications. From micro-solenoids in medical dosing to heavy-duty actuators in automotive and aerospace systems, our controlled winding processes ensure consistent stroke force and zero thermal degradation.
Zero-Power Energy Efficiency: Our bistable latching solenoid coils utilise permanent magnetic circuits to maintain held positions without continuous electrical current. This eliminates thermal dissipation, reduces power consumption to zero during hold cycles, and optimizes system efficiency for battery-powered or green industrial automation.
OEM Solenoid & Latching Coil Capabilities
Bespoke bobbin-mounted, self-supporting (air-core), and encapsulated coil profiles
Fine-gauge precision winding down to ultra-fine wire diameters for compact enclosures
Self-bonding magnet wire (heat or solvent activated) for high vibration resistance
Precision layer winding for maximum copper fill factors and optimal magnetic flux
Continuous-duty (100% ED) and pulse-actuated magnetic latching coil options
ATEX and IECEx compliant encapsulated options for hazardous/explosive environments
Fast-turn 3D-printed bobbin prototyping and quick-turn tooling
Integrated lead wire attachment, overmoulded headers, and custom wiring harnesses
100% quality inspection, including resistance, surge, inductance, and Hi-Pot testing
Specialised protective packaging ensuring safe global delivery and immediate usability
Governing Physics: Actuation Force & Permanent Magnetic Latching
The linear mechanical pull (or push) force produced by a solenoid winding is directly governed by Maxwell’s pull formula for electromagnetic force:
F = (B² · A) / (2 · μ₀)
Where F is the magnetic actuation force (Newtons), B is the magnetic flux density (Tesla) produced by the coil winding, A is the pole face surface area (m²), and μ₀ is the permeability of free space.
For bistable latching solenoids, an initial DC pulse through the coil generates the flux density required to pull the armature into position, where it is held indefinitely by an internal permanent magnet with zero continuous power consumption. Reverse polarity pulse excitation generates an opposing magnetic flux (-B) that cancels the holding field, releasing the mechanism instantly. Anstee Coil engineers exact turn counts and resistance profiles to ensure clean, repeatable latching and unlatching without thermal buildup.
Technical Specifications
| Specification Parameter | Standard Capability & Range |
|---|---|
| Coil Types | Linear Solenoid Coils, Bistable Latching Coils, Rotary Solenoid Windings, Holding Magnets |
| Winding Configurations | Fine-Gauge Bobbin-Wound, Self-Supporting (Air-Core), Layer-Wound, Dual-Winding (Pulse/Hold) |
| Duty Cycle Ratings | Continuous Duty (100% ED), Intermittent Duty, High-Speed Pulsed Actuation |
| Insulation Classes | Class B (130°C), Class F (155°C), Class H (180°C), Ultra-High Temp Class C (200°C+) |
| Wire Types & Materials | High-grade enamelled copper, self-bonding wire (thermosetting/solvent), fine-gauge wire |
| Encapsulation Options | Overmoulding, epoxy resin potting, Vacuum Pressure Impregnation (VPI), tape wrapping |
| Quality Testing | 100% Resistance & Inductance Verification, Inter-Turn Surge Testing, Hi-Pot, ISO 9001:2015 |
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Designed for High-Cycle Efficiency & Harsh Environments
Solenoid coils often operate under rapid duty cycles, thermal stress, and continuous mechanical shock.
By implementing self-bonding wire, high-grade Class H (180°C) and Class C (200°C+) insulation, and Vacuum Pressure Impregnation (VPI), our coils eliminate micro-vibrations, prevent inter-turn shorting, and maintain electrical symmetry across millions of switching cycles.
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Global Manufacturing & Tri-Region Supply
Anstee Coil Technology supplies solenoid and latching device coils globally, supporting OEM clients across Europe, Asia, North America, and Latin America. We deliver consistent engineering standards, ISO 9001 quality controls, and reliable lead times from our manufacturing facilities in the UK, China, and Mexico.
Frequently Asked Questions
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A standard solenoid coil requires continuous electrical power to maintain its pulled or pushed position. A latching solenoid coil uses an internal permanent magnet to hold the armature in place after a brief electrical pulse, consuming zero power during the hold state and requiring a reverse-polarity pulse to release.
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Yes. We utilise self-bonding magnet wire activated by heat or solvent during winding to produce rigid, high-density air-core coils without bobbins, maximising magnetic flux in space-constrained enclosures.
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Yes. For 100% continuous-duty applications, we calculate exact wire gauges and thermal dissipation limits, applying Class H (180°C) or Class C (200°C+) insulation to prevent thermal breakdown under non-stop operation.
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Yes. We supply fully potted and overmoulded solenoid coils designed to meet ATEX and IECEx intrinsically safe requirements for hazardous areas, including petrochemical refining, mining, and chemical processing.
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Yes. We manufacture complete sub-assemblies, incorporating flying lead wires, overmoulded connectors, strain-relief boots, and custom wiring harnesses ready for direct plug-and-play assembly.
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Utilising fast-turn 3D-printed bobbins and our stocked range of wire gauges, standard prototype runs are typically delivered within 2 to 5 working days.
Request a Quote for Solenoid & Latching Device Coils
If you require coils for solenoids or latching devices, whether for prototype development, validation, or full production supply, our engineering team is ready to support your project.
Contact us to discuss your requirements or request a quote.
Contact Us
UK
E sales@ansteecoil.co.uk
T +44 (0) 1453 708900
CHINA
E sales@ansteecoil.cn
T 0519-89886850
Mexico
E sales@ansteecoil.mx
T +52 81 87480766
Did you know...
In 2010, US publisher Ward’s estimated that there were more than one billion vehicles in the world. Although it’s an inexact science, other estimates suggest we’ll have 2.5 billion cars by 2050. Given that most of them have an electromagnetic coil in their starter motor, that’s a lot of coils on our roads.
