| 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. |
