Bobbin Wound Inductors

BOBBIN WOUND INDUCTORS

Application Notes > Custom Inductors > Bobbin Wound Inductors

Gowanda designs and manufactures Bobbin Wound Inductors for a variety of power supply and power conversion applications.

A Bobbin Wound Inductor is a inductor that is designed with the coil wound on a coil form or bobbin. The core structure is then mounted to the bobbin. Bobbin wound Inductors can be designed to operate from 60Hz, or line frequency, well into the MHz range.

Bobbin Wound Inductor Applications

      • Switch mode power supplies
      • Power conversion applications
      • Filter circuits
      • Any application that the inductor can be designed on a bobbin or coil form

Bobbin Wound Inductor Design

Typical minimum requirements to be specified for a Bobbin Wound Inductor are:

      • Power rating in VA
      • Operating frequency in Hz. Operating frequency is needed for core calculations and wire sizing
      • Operating current levels, DC in Amps and AC in Amps peak to peak
      • No load inductance in μH
      • Full load inductance in μH
      • Operating frequency is needed for core calculations and wire sizing

Core material is selected for the known operating frequency or frequencies which can be anything from silicon steel laminations to a ferrite core structure.

Other bobbin wound inductor design considerations are space limitations and mounting technique.

Lead terminations, if needed, may also be specified through the design of a Bobbin Wound Inductor.

Bobbin wound inductor designs vary widely in terms of power rating, voltage and current levels, operating frequency, size, impedance, bandwidth (frequency response), packaging, winding capacitance, and other parameters.

Photo Gallery

      • Inductance: 10mH, +/-10% @20 Amps
      • HiPot Test: 1,500Vac to core
      • Core Structure: E-I lamination, SiFe, Interleaved
      • Dimensions: 2″H x 2-5/16″W x 1-7/16″D
      • Hole Spacing: 2-9/16″ center to center x 3/16″ holes
      • Terminations: 1/4″ Faston
      • Mounting: Channel Frame
      • Finish: Varnish coated
      • Weight: Approximately 1 pound
      • Part Number: 120-0022

Completed Custom Built Bobbin Wound Inductor designed for current surge suppressor in PWM servo drive.

      • Inductance: 200 μH
      • Core Structure: E-E SiFe butt-stacked lamination with approximately 0.010″ – 0.015″ gap
      • Dimensions: 3/4″H x 1″W x 1-1/8″D
      • Finish: Varnish coated
      • Weight: Approximately 0.5 pound
      • Part Number: 120-0056

Completed Custom Built Bobbin Wound Inductor designed for avionics test application.

      • Inductance: 98mH @ 456mA
      • Frequency: 400Hz
      • HiPot Test: 1,000 Vac to core
      • Core Structure: E-I lamination, SiFe, Butt-stacked. approximately 0.005″ gap
      • Dimensions: 1-3/8″H x 1-5/8″W x 1-1/8″D
      • Hole Spacing: 2″ center to center x 3/16″ holes
      • Mounting: Channel Frame
      • Finish: Varnish coated
      • Weight: Approximately 0.5 pound
      • Part Number: 120-0092

Completed Custom Built Bobbin Wound Inductor designed for Solenoid test load coil circuit.

      • Inductance: 600 µH @ 18 Amps
      • HiPot Test: 500 Vac to core
      • Core Structure: E-I lamination, SiFe, Interleaved
      • Dimensions: 2-5/8″H x 3-1/8″W x 2-3/8″D
      • Hole Spacing: 3-9/16″ center to center x 3/16″ holes
      • Termination: 2 x #13 AWG magnet wire, each lead
      • Mounting: Channel Frame
      • Finish: Varnish coated
      • Weight: Approximately 2.5 pound
      • Part Number: 120-0103

Completed Custom Built Bobbin Wound Inductor designed for common mode line filter.

      • Inductance: 10,000 µH @ 10A max
      • HiPot Test: 1,800 Vac, Winding to Winding
      • Frequency: 47 Hz – 63 Hz
      • Core Structure: Ferrite E-Core
      • Dimensions: 1.80″H x 1.20″W x 1.10″D
      • Lead Spacing: 1″ x 0.6″ x 0.040″ diameter pins
      • Mounting: Thru Hole
      • Finish: Varnish Coated
      • Weight: Approximately 0.5 pound
      • Part Number: 130-0031

Completed custom built bobbin wound inductor designed for a 208Vac, 1-phase line reactor – wound with copper foil. The copper foil used is 0.030″ x 3″ wide. This bobbin wound inductor is designed to function as a 208 volt line reactor.

      • Inductance: 75 µH
      • Frequency: 60 Hz
      • HiPot Test: 2,000 Vac coil to frame
      • Core Structure: 1″ x 0.011″ strip wound core
      • Dimensions: 5.5″L x 7″H x 3″W
      • Termination: 1-1/4″ x 5/8″ x 1/8″ thick tabs with 5/16″ holes
      • Mounting Hole Spacing: 5″ x 2.5″ center to center
      • Mounting: Chasis mount, 4 x 5/16″ diameter holes
      • Finish: Varnish coated (coils only), for field adjustment of gap
      • Weight: Approximately 12 pounds
      • Part Number: 120-0080

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