EI Frequency Transformer

Super EI frequency transformer sold to all over the world

Transformer Details [ Bobbin EI30 Vertical ]Primary 3 Turns + 3 Turns [ If possible 2.5 cm Copper strips ]Secondary Winding 0 + 55 Turns + 40 Turns, then Auxiliary winding 5 Turns  Wire 0.8 mm Copper , thisParameters suit for you?

we have ei30 transformer,efd 25 core,efd 25 transformer,efd 43 transformer bobbin, 

efd bobbin, efd cores,efd frequency transformer,efd high frequency transformer, 

efd type transformer, efd-25 transformer bobbin

The popular EI  frequency transformer achieved ISO9001 certificate,5 patents and have applied for "China New and High-tech enterprise" project and successful

Tips:

Winding test of three-layer insulated wire: take a sample with a length of at least 305mm and wrap it around a round rod with an outer diameter equal to 10 circles at a speed of 1-3 circles/second. During winding, the tension force of the wire is good enough to make the line in close contact with the round rod, and attention should be paid to the phenomenon that the sample should not have elongation. After winding the sample, the insulation layer shall not have cracks deep enough to the conductor.
Pull test of three-layer insulated wire: take 200mm sample and pull it off. After the pull, the sample should not expose copper at the fracture. The ring cutting of 10mm should not fall off in tubular shape when the specimen extending from the fracture is made.

Thermal shock test of three-layer insulated wire: take at least 305mm sample and wrap it around the round rod with the outer diameter of the sample at a speed of 1-3 cycles/s for 10 cycles. During winding, the tension strength of the wire is good to make the line in close contact with the round rod, and attention should be paid to the phenomenon that the sample should not have elongation. Put the sample at 155 ℃ under the constant temperature box in 30 minutes, and then remove samples from the constant temperature box, after waiting for its cool to room temperature, with 10 times the magnifying glass to observe its surface, the insulation shall not be cracked.
The softening for three layers of insulation breakdown test: according to the national standard GB/T4074.6-1999 article 4 test method 2 min at 170 ℃ temperature no breakdown.

Three layers of insulated wire soldering test: sample into the solder groove to 420 + 5 ℃ after 2 s, tin wire surface should be smooth, no pinhole.
Voltage resistance test of three-layer insulated wire: take a 305mm straight line sample, and clamp the sample up and down with two pieces of copper foil with a length of 152mm. The length of the sample beyond the two ends of the copper foil length is equal, and the test voltage is applied between the two copper foil and the sample. The test voltage was 3000V, the leakage current was 2mA, and the test time was 1 minute. The sample shall not be broken down after the voltage is applied for 1 minute according to the above method.
Surface quality of three-layer insulated wire: the surface of high-frequency high-voltage withstand winding wire should be bright and clean, uniform color and luster, and there should be no defect affecting the performance of high-frequency high-voltage withstand winding wire.
Inspection rules for three layers of insulated wire: the appearance, size, elongation, flexibility and adhesion, pressure test and other test items shall be made for each roll of product. Each batch of products shall be tested in accordance with the sampling ratio agreed by the supplier and the supplier for all items specified in this standard. The records shall be provided to the other party upon request. In addition to the appearance, size and elongation of nonconforming items can be degraded with the demander, found other nonconforming items will not double the retest will be treated as nonconforming products.