Custom Coils

Downhole Magnetics

Downhole Magnetics

Being an industry-leading custom transformer and inductor manufacturer Custom Coils has built Downhole magnetics that fulfill our client needs. Over 50+ years of industry experience, we specialize in the design and manufacturing of downhole magnetics that can withstand extreme temperatures. Our transformers and inductors for downhole industry are designed to meet diverse specifications in shock vibration, size, and temperature.

Today, most of our downhole designs are for 200C and 220C although we have some that operate at 240C temperatures as well. As the downhole market continues to drill deeper, the operating temperatures have continued to increase.

Design Elements

The downhole industry, as with the aircraft industry, requires high reliability under extreme environments as a key element of the design. Custom Coils regularly delivers to customers who expect zero defects found. Materials used in downhole designs are very critical. Using the proper materials for the specific operating temperatures is imperative.

Hi-Temp Cores

• Powdered Iron (200C)
• MPP (200C)
• Ferrite (300C)

Small Geometries

• Toroids down to 4mm
• EE5 ER9.5 E-cores
• Potcores down to 7x4mm

Hi-Temp Wires

• MW35-C (200C)
• ML16 (240C)

Insulation Materials

• Kapton (180C)
• Teflon (200C)
• Nomex (220C)
• Teflon/GC (260C)

Flying Leads

• Teflon type E

Solder Types

• Lead-free (230C)
• HMP (300C)

Compounds

• Ripley's 468-2FC (220C)
• Dolph's BC346A (220C)