https://www.custommag.com/r-core-transformers Custom MagneticsCustom Magnetics * About Us * Services + Design/Engineering + Manufacturing * Our Capabilities + Current Transformers + High Voltage Transformers + Sound & Music Transformers + Current & Potential Transformers + Ignition Coils + R-Core Transformers + Power Generation & Distribution + Standard Lines * Contact Us Menu *Search: [ ] [Go] * About Us * Services + Design/Engineering + Manufacturing * Our Capabilities + Current Transformers + High Voltage Transformers + Sound & Music Transformers + Current & Potential Transformers + Ignition Coils + R-Core Transformers + Power Generation & Distribution + Standard Lines * Request Quote R-Core Transformers R-Core Transformer R-Core Transformers are manufactured using a unique rectangular core with a round cross section known as an R-Core. These special cores, developed by Japanese engineers, feature a continuous strip of grain-oriented silicon steel with no air-gap. The winding is done on special round bobbins on the two parallel legs of the core. R-Core Transformers can be designed so that coil windings mutually cancel each other's magnetic flux by means of balanced, symmetrical winding on the two legs. With this winding method the leakage flux can be kept to a minimum. Canceling.png?Revision=v3h&Timestamp=c3kFMM Additionally R-Core transformers have absolutely no gap in the magnetic path. Again this feature allows leakage flux to be extremely low. EI-type, UI-type, and cut core type transformers have 2 to 6 magnetic gaps. A great deal of leakage flux escapes from these magnetic gaps. In fact, leakage flux in an R-Core Transformer is about 1/10th that of conventional EI or UI transformers. UI-Gaps.png?Revision=B3h&Timestamp=cxkFMM The R-Core with its low-leakage, low-noise characteristics is well suited for medical equipment, audio & video amplifiers, and other noise sensitive equipment. Circuit designers are able to place the transformer closer to other critical electronic components. Another unique feature of the R-Core is the use of two part bobbins. The primary winding and secondary winding are done on separate concentric bobbins thus ensuring complete isolation. This allows meeting of any safety standards requirement. R-Core-Side-Mount.png?Revision=T3h&Timestamp=YnYxMM ^ ^R-Core ^Toroidal ^EI Type Characteristic ^While there are ^There are gaps no gaps in the in the magnetic ^With balanced magnetic path, path and the winding canceling the winding are winding is not the leakage flux, not balanced balanced. As a the total amount of hence there is result the ^Leakage Flux leakage flux is still leakage flux is extremely small. As some leakage very high which a result can be flux. Shielding can affect used even without is sensitive shield. often required electronic to reduce the components if effect on other proper shielding components. is not provided. ^The winding is not evenly ^Winding is done on spaced. The ^While the layers special machine density of turns of turns are well resulting in evenly on the inner laid out the ^Winding spaced winding. edge is more and winding is only Balanced winding is on the outer on the center an inherent edge the wires limb of the EI constituent of the are roughly core. Thus it is design. spaced out. Thus not balanced. the winding is not balanced. ^The exciting ^More exciting current is less current is ^The exciting than that in EI required due to current is minimal Transformers, presence of as all the magnetic but magnetic gaps, ^Exciting paths are in generally higher the inability to Current alignment with the than that of use the effect of rolling direction R-Core rolling direction of the steel and transformers due of grain oriented there is no gap in to lack of steel, the the core. balancing of variation in windings. assembly operation, etc. ^Very low losses ^Efficiency is result in better better than EI efficiency. Transformer but ^More losses ^Efficiency Efficiency of generally less result in poor greater than 90% is than an R-Core efficiency. generally observed transformer. in most designs. ^Due to inherently thin design & ^Due to its cubic light weight, the ^Because of shape and heavier R-Core the circular weight, the EI ^Mounting Transformers can be shape mounting Transformer mounted in several options are generally takes ways. It can be limited. up more space in mounted flat, the assembly. vertically, or on the its side. Request a Quote Have a custom project? Request a quote below and we will be in touch soon. [ ]*First Name: [ ]*Last Name: [ ]*Email: [ ] *Your Message: [Submit Message] Get In Touch Phone: 260.982.8508 Fax: 260.982.4942 Email: sales@custommag.com Custom Magnetics Custom Magnetics, Inc. 801 W. Main St. N. Manchester, IN 46962 [ISOLog][ITARLo][MBELog] (c) 2023 Custom Magnetics Loading