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| MIRACLE is established in the year 1994. It has started with manufacturing of EI Transformers as well as Toroidal Transformers. Today it has positioned itself as a leading manufacturer of Toroidal Transformers, EI Transformers |
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 Experienced R & D department |
| Production Capability |
| Large Product line |
| Reliability |
| Reputation |
| OEM Capability |
| Buyer's Specifications Accepted |
| Huge Inventory |
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How to Specify Toroidal Transformers?
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How to Specify Toroidal Transformers?
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Use the Customer Specification Sheet to initiate a custom designed Toroidal transformer for your application. Follow the simple guide outlined below and then select send to mail the data to our office for a prompt design and cost estimate.
Electrical Data
Estimate power out: Give the approximate total power output that the transformer would be expected to deliver to the load(s).
Expected duty cycle: To insure minimum size, include information regarding intermittent operation if a continuous load is not expected.
Ambient temperature: The temperature of the environment that the transformer will be expected to perform in. A tight enclosure with convection cooling is approximately 35-40oC.
Maximum temperature rise: This is the temperature increase above the ambient temperature that the transformer will elevate to under the specified load considerations. The size of a transformer is Inversely proportional to the temperature rise. Our standard designs yield a rise of 60-70oC. We have recognised insulation systems to allow up to a 140oC rise.
AC Line voltage (s): Select all voltages that the transformer primary (is) should be designed to operate.
Thermal protection: When necessary, an approved thermal breaker, mounted within the coil to interrupt the primary or secondary circuitry, may be provided.
Line frequency: Give the incoming power line frequency or fundamental frequency for the primary windings.
Secondary load voltages (s): The voltage in the load(s) may be expressed in either one of two ways.
a) AC (RMS) voltage and current or power (VA) for each secondary winding or.
b) DC load parameters. We can design the optimum transformer directly from your specific DC load
Data. When specifying DC parameters we must have DC voltage, current or power, rectifier type (FW, FWCT, FWB, etc.), filter configuration (capacitor or choke input), capacitor and/or inductor size, regulator type, and special load characteristics (such as duty cycle). In this case, we'll determine the optimum AC characteristics for the secondary. When possible, please furnish a simple schematic.
Connections
Self leads: Our standard termination are self-leads, where the solid copper windings are extended for connection to load circuitry. Colour coded, insulated slewing is provided over each lead (with double layers over Primary leads) stripped 0.25 inches from the end.
Stranded leads: Where the transformer coil winding wire is either too light or too heavy, insulated stranded wires are available.
Terminal blocks: In high power flange mounted units, terminal blocks mounted between the flanges are an optional customer specified feature.
Special Options
Electrostatic screen: A 2 mil copper strip, laminated between two layers of polyester insulation and wound over the primary, is a customer specified option to reduce electrostatic coupling between windings. An Insulated lead wire from the strip provides connection to ground.
Magnetic shield: Because toroids already exhibit an 8:1 reduction in stray magnetic fields, they are ideal in applications calling for very low noise. Several options are available to even further reduce the effects of radiated magnetic fields; special wound Coils a strip of silicon steel around the toroid's circumference, or steel enclosures (cases). |
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