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POWER TRANSFORMER COMPARISON DATA USING 3 DIFFERENT TYPES OF CORES

Comparison Chart of a 250 VA power transformer

Feature  O-CORE TOROIDAL  E-I CORE
       
Height  1.375" (34.9 mm) 2.2" (55.8 mm) 4.7" (119.4 mm)
OD/Width  4.5" (114.3 mm) 4.5" (114.3 mm) 3.9" (99.1 mm)
Depth --  -- 4.3"(109.2 mm)
Volume  22 cu.in.(361 cm3) 35 cu.in.(574 cm3) 78.8 cu.in.(1291 cm3)
Weight  3.6 lbs (1.63 Kg)  5 lbs (2.27 Kg) 10 lbs (4.54 Kg)
Mounting Requirements Single Bolt Through Center Single Bolt Bolt Through Center Bolts in Four Corners
Magnetizing Current 16 mA 18.3 mA 160.0 mA
No-Load Losses 1.7 W 1.7 W 20.5 W
Continuity of Magnetic Path 100% parallel grain orientation 100% parallel grain orientation 50% of grain Perpendicular Causing higher Eddie Currents
Magnetic Properties
of Core
Optimized prior to winding and remain Stable Optimized prior to winding and remain Stable Negatively impacted Properties Stable by clamping, welding or banding.
Coupling Factor Maximized by evenly distributed winding on the core and close proximity to the actual core itself. Maximized by evenly distributed winding on the core and close proximity to the actual core itself. Limited by bobbin width and layers of windings.
Long-Term  Reliability In excess of 10 years In excess of 10 years Performance degradation over time from thermal cycling and vibration.

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