BOBBIN WOUND INDUCTOR THEORY AND APPLICATIONS
Bobbin wound inductors are crucial components in various electronic circuits, offering reliable performance and efficient energy storage. This guide explores their structure, principles, and applications in modern electronics.
What is a Bobbin Wound Inductor?
A bobbin wound inductor consists of a wire coil wrapped around a non-conductive form (bobbin) with a magnetic core material. This design allows for efficient magnetic field generation and energy storage.
Structure and Design
Key components of bobbin wound inductors include:
- Insulated copper wire
- Non-conductive bobbin (typically plastic or ceramic)
- Magnetic core material (e.g., ferrite, powdered iron)
- Termiantions for circuit connection
The inductor’s performance is determined by:
- Number of wire turns
- Wire gauge
- Core material properties
- Bobbin dimensions and shape
Principles of Operation
Bobbin wound inductors operate based on Faraday’s Law of Induction. When current flows through the coil, it generates a magnetic field. Changes in this current induce a voltage across the inductor, opposing the change in current. This property makes inductors valuable for energy storage and filtering applications.
Advantages of Bobbin Wound Indutors
- High inductance values in compact sizes
- Excellent magnetic field containment
- Customizable for specific applications
- Cost-effective for mass production
- Wide range of available core materials
Applications
Bobbin wound inductors are widely used in:
- Power supplies and voltage regulations
- EMI/RFI filtering circuits
- DC-DC converters
- Audio equipment
- Telecommunications devices
- Automotive electronics
- Industrial control systems
Design Considerations
When designing with bobbin wound inductors, consider:
- Required inductance range
- Operating frequency
- DC bias current
- Temperature coefficient
- Saturation current
- Self-resonant frequency
- Environmental factors (temperature, humidity, vibration)
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
- 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
- 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
- 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
- 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
Conclusion
Bobbin wound inductors play a vital role in modern electronics, offering efficient energy storage and magnetic field generation. Their versatility and customizable nature make them ideal for a wide range of applications. For custom bobbin wound inductor solutions or further information, contact Gowanda Electronics’ expert team.
Custom Solutions from Gowanda Electronics
At Gowanda Electronics, we specialize in creating custom bobbin wound inductors tailored to your specific requirements. Our expertise in design, manufacturing, and testing ensures high-performance solutions for demanding applications.