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Toroidal
O-CORE Power Transformers
O-Core power transformers are the preferred choice for applications that
require a low profile and where a low weight is a design priority.
O-Core transformers have a diameter to height ratio of around 3:1. The performance of a toroidal transformer can be further optimized
by using
an O-Core.Since O-Cores have no sharp edges they require less insulation and can be wound with less fill factor resulting in a lighter and smaller transformer than a conventional toroid transformer.
The grain oriented silicon steel properties of O-Cores are the same as in our conventional toroidal cores giving the O-Core transformers the same electrical benefits. They can be used in designs for the same applications.
If your design requires a narrow footprint our conventional toroidal core is a better choice. Please contact us regarding the flexible dimensions of our conventional toroidal core designs.
O-Cores are wound from a steel strip, which is continuously pointed towards each end to produce a circular cross section. The circumference of a circle is about 12% less than that of a square with same area and 18% less than a rectangle with the same area and a height to width ratio of 2:1 as in the most popular conventional toroidal transformer.
Please refer to the chart below for the physical sizes of power ratings up to 2,000VA 60Hz
|
O-Core Transformers Size and weight of different power ratings | |||||
| Power VA @ 60Hz |
Power
VA @ 50/60Hz |
Dimensions
|
Weight |
||
| 45 | 36 | 3.0x1.0 | 76x24 | 1.2 | 0.5 |
| 65 | 52 | 3.2x1.0 | 80x26 | 1.4 | 0.6 |
| 90 | 72 | 3.4x1.1 | 86x28 | 1.7 | 0.8 |
| 115 | 92 | 3.7x1.2 | 93x30 | 2.2 | 1.0 |
| 175 | 140 | 3.9x1.3 | 99x32 | 2.7 | 1.2 |
| 220 | 176 | 4.2x1.4 | 105x34 | 3.2 | 1.5 |
| 275 | 220 | 4.5x1.4 | 113x36 | 3.8 | 1.7 |
| 320 | 256 | 4.6x1.5 | 116x38 | 4.2 | 1.9 |
| 425 | 340 | 4.9x1.6 | 124x41 | 5.2 | 2.4 |
| 550 | 440 | 5.2x1.7 | 131x43 | 6.1 | 2.8 |
| 650 | 520 | 5.4x1.8 | 138x45 | 6.8 | 3.1 |
| 800 | 640 | 5.7x1.9 | 144x49 | 8.5 | 3.9 |
| 1000 | 800 | 6.0x2.05 | 152x52 | 9.8 | 4.5 |
| 1300 | 1040 | 6.3x2.1 | 159x54 | 12.5 | 5.7 |
| 1600 | 1280 | 6.7x2.3 | 169x57 | 15.0 | 6.8 |
| 2000 | 1600 | 7.0x2.4 | 179x61 | 17.5 | 7.9 |
Note:
- For 50/60 Hz operation, the listed power rating is reduced by 20%.
- Dimensions and weight are based on single primary and single secondary windings.