Custom Transformer and Coil Solutions for Agricultural Equipment

Agriculture has changed fundamentally. Modern farming operations run on precision agriculture electronics: GPS-guided tractors, automated milking parlors, PLC-controlled grain dryers, and climate-managed greenhouses. Every one of these systems depends on a reliable transformer for agricultural equipment to condition power, isolate controllers, and drive accessory loads without interruption.

Custom Coils is an ISO 9001 certified custom transformer manufacturer based in Alcester, South Dakota, supplying specialty transformers, antenna coils, and inductors to agriculture OEMs across the USA since 1967.
 

Custom Magnetic Solutions for Agricultural Equipment

Antenna & Air Coils for Irrigation Guidance

As a specialist antenna coil manufacturer, Custom Coils produces buried-wire sensing coils for center-pivot and linear irrigation guidance systems. Our coils accurately detect the magnetic field of the buried guide wire and deliver a clean, crisp position signal to the navigation controller. This gives irrigation OEMs the field-steering accuracy their customers expect across hundreds of acres per run.
We also wind precision air coils for GPS auto-steer systems on tractors and implements. Our custom coil winding USA facility produces coils ranging from 3 to 24 inches in length, with custom shapes up to 2.5 ft × 3 ft readily available.

Note: We do not manufacture metal-detector coils.

Control Transformers for PLC and Automation Systems

Every automated milking system, greenhouse climate controller, and grain dryer panel needs a high-performance control transformer. These units deliver stable, low-voltage power to the programmable logic controller (PLC) free of switching transients and line noise.
As a premier custom transformer manufacturer, we design each unit to your exact primary and secondary voltage, VA rating, and panel footprint. Insulation class options ranging from Class B through Class H let us perfectly match the thermal environment of your enclosure, whether it is a climate-controlled dairy barn or an exposed, outdoor grain-handling installation.
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Power Transformers for Tractor and Field Electronics

GPS receivers, auto-steer displays, and guidance controllers on modern tractors and implements all require stable power derived from the machine's electrical bus. As an established OEM transformer manufacturer with decades of mobile machinery experience, we build power transformers engineered to survive intense vibration, extreme temperature cycling, and voltage variations common to field equipment.
The same heavy-duty capability extends to grain conveyors, augers, and on-farm storage systems wherever you need custom magnetic components rated for continuous duty in a demanding environment.

Step-Up/Down and High Voltage Transformers

When accessory motors on loaders, graders, or dumpers operate at non-standard voltages, a step-up or step-down transformer for agricultural equipment solves the mismatch efficiently. We precision-size each unit to the motor's rated current and starting inrush.
For sugar processing operations, our rugged  high voltage transformers handle power distribution to mill drives, boilers, choppers, levelers, and crystallization equipment. These units are built with robust laminated cores and the precise insulation class that high-temperature processing plants demand. Every design comes from our experienced custom coil manufacturer team, working directly to your technical specification.

Applications We Support

• Center-pivot and linear irrigation guidance systems
• GPS auto-steer and tractor/implement electronics
• Automated milking and dairy parlor PLC systems
• Greenhouse climate and humidity automation systems
• Grain dryers, conveyors, and on-farm storage equipment
• Sugar processing: mill drives, boilers, and crystallization equipment
• Tractor, plow, and implement field electronics

Why Agriculture OEMs Choose Custom Coils

We do not sell standard parts from a catalog. Every transformer for agricultural equipment or antenna coil we produce starts with your unique electrical specification: voltage ratio, VA rating, insulation class, enclosure footprint, and environmental exposure. Advanced epoxy and polyurethane encapsulation options are available for components that face direct moisture, dust, or heavy vibration in the field.
With manufacturing continuity stretching back to 1967, the specialized ability to reverse-engineer discontinued parts, and 100% production testing on every single order, Custom Coils is the trusted  OEM transformer manufacturer agriculture OEMs rely on when field performance cannot be compromised.
Get a Custom Quote for Your Agricultural Transformer or Coil
Tell us your application, voltage requirements, and operating environment. Our sales engineering team will return a comprehensive design proposal and quotation typically within one business day for standard configurations.
Contact Custom Coils Today
 

Frequently Asked Questions (FAQs)

 

Q: What types of transformers does Custom Coils manufacture for agricultural equipment?

A: We manufacture control transformers, power transformers, step-up/down transformers, high voltage transformers, and antenna coils. Every unit is a custom-built component designed to your exact technical specification.

Q: Can you build a transformer to a specific voltage and VA rating?

A: Yes. As a custom transformer manufacturer, we design every unit to your exact primary voltage, secondary voltage, and VA rating, with the mechanical footprint and mounting configured to match your enclosure.

Q: Do your transformers handle outdoor and dusty field environments?

A: Yes. All custom magnetic components are available with premium epoxy or polyurethane encapsulation for high moisture, dust, and vibration resistance. Please specify your operating environment when requesting your quote.

Q: What insulation class do you recommend for grain dryer control panels?

A: Our control transformers are available in Class B, F, and H insulation. For high-heat grain dryer panels, Class F or H is typically recommended. Share your maximum ambient temperature with our team, and we will advise on the best fit.

Q: Can Custom Coils replace a discontinued coil from a legacy irrigation system?

A: Yes. Our custom coil winding USA facility regularly reverse-engineers discontinued irrigation guidance coils. Simply provide a sample, drawing, or technical specification, and we will deliver a pin-compatible replacement.

Q: What is the typical lead time for a custom agricultural transformer or coil?

A: Standard designs from our custom coil manufacturer facility are typically prototyped in four to six weeks. Contact our team with your specifications and timeline for an accurate delivery schedule.