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Bobbin Design |
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If your design has room for a bobbin and your annual demand is over 300 coils/yr, a bobbin will save you time and money.
Consider using a stock bobbin for initial qualification. Most stock prototype bobbins are nylon. Customer specified material can often be used in the same mold. See note below for reserving and additional .150 inches in length to design the bobbin for automated winding and welding.
Consider using a stock bobbin for initial qualification. Most stock prototype bobbins are nylon. Customer specified material can often be used in the same mold. Classic Coil's engineering staff will help you select a stock bobbin. Ready to get started? Contact us to specify your basic coil foot print. Remember to reserving an additional .150 inches in length to design the bobbin for automated winding and welding.
Production Bobbin Considerations:
 Most glass filled bobbin flanges should be at least .030” thick- Annual volume has the potential to exceed
5000. Add .100-.120” to the top flange
and .030” to the bottom. This added footprint
will allow for bobbin to carry terminals (thus
eliminating the costly manual soldering operations-
see discussion on Molded Coils.) The added height
will also accommodate automated winding machines
- Bobbin material depends upon UL and environmental
considerations - see encapsulant area for UL
material selection
- Bobbin terminal slot can be designed to take
spade terminals that match the mating female
connector or accept lead wire to be welded
- Spacing between terminals- UL dependent
- Bobbin design should accommodate diodes, rectifiers or fuses
- Moisture barriers may need to be designed
into the bobbin
- UL Considerations for bobbins not to be overmolded
UL Considerations for bobbins not to be overmolded *
| UL Class |
Magnet wire |
Bobbin/tube material |
F |
MW 26/ MW 24(180C) |
Rynite series 415HP, FR 515, FR 530, FR530L, Nomex 410, Zytel |
F |
MW80 (150C) |
Rynite FR 530, Nomex |
H |
MW 35, MW 74(200C) |
Aramid Paper, Nomex |
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| *For coils that will be over molded, see Encapsulate Decisions |
Metal Bobbins for Cores, Rotors , LVDT, RVDT
- must be insulated between the bobbin, rotor,
and magnet wire
- For bobbin- Kapton tape provides the insulation
- For rotors and where space is limited- use 3M Scotchcast powder resin. Contact Classic Coil Engineering for help in specifying electrostatic coatin
Ready to
Get Started? Contact us to begin!
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Quality
Assurance 