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Design
Considerations - Finishes |
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Polyester tape: A proven, economical option.
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Metal can or plastic enclosure: For environmental protection and / or magnetic shielding. |
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Varnishing and vacuum impregnation: Good protection; recommended for harsh environments. Protective against humidity and pollution.
Avel offers full vacuum and pressure varnish impregnation, as well as envelope dipping with mold-resistant polymers and protective barriers. Impregnation and dipping can be carried out with either standard solvent-based coil varnishes or solventless epoxy varnishes. Please call if
you have an unusual environmental requirement. |
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Design
Considerations - Terminations |
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Flying solid lead wires: Most cost-effective.
Flying stranded lead wires:
Withstand repeated flexure better than solid wires; may be required if connectors or terminals are to be crimped to wires.
We can supply transformers with connectors or terminals to your specifications attached to lead wires-just indicate manufacturer and part number on request for quotation form. |
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Tabs (not shown):
For quick connections and disconnection using standard wire terminals. |
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Pins for PCB mounting: Save time in assembly; standard and custom pin
layouts available. |
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Design
Considerations - Mounting Options |
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Dished mounting plate with foam pads and bolt: The most economical
mounting option. |
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Epoxy resin-filled center with threaded bushing or clearance hole: Resin can be recessed for the bolt head to allow flush mounting. Ideal for minimizing height; more rugged than the standard (dished plate) mounting kit. |
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Metal mounting frame (H-frame): Suggested for 1000VA and above and / or applications with extremes of shock and vibration. |
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L-bracket or omega bracket: For vertical mounting. |
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Markings and international standards:
Transformers can be certified to and marked for:
- UL506/CSA 22.2, No. 66; UL1411/CSA 22.2 No. 1-94; UL1950/CSA 22.2 No. 950-95; UL2601 (UL544)/CSA 22.2 No.601.1; CE marked and tested in accordance with EN61558 (replacing EN60742), EN60065, EN60950,
BS415, VDE0550.
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Minimizing Noise:
Although toroidal transformers inherently exhibit very low radiated field, the following
may be considered to reduce noise further in very sensitive applications.
- Steel or Mu-metal band: Added to periphery under finishing tape.
- Metal can: For complete or partial enclosure.
- Resin filling can also dampen acoustic noise.
Transformers can also be constructed using special manufacturing techniques and tested
to ensure 100% acceptable noise levels. |
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Custom Leads and
Terminations: Reduce your assembly labor costs-let us supply transformers with connectors or terminals to your specifications attached to lead wires.
Just indicate manufacturer and part number on the request for quotation form. |
