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Transformer Type Electric Machines:


The classic study of electromagnetic (linear or rotating) electric machines (EM) starts with the study of electromagnetic rotating transformers with two electrical ports that symmetrically translate and isolate the primary and secondary winding sets for magneto-motive-force (MMF) balance. In considerations, electric machines are classified as asymmetrical and symmetrical (rotating or moving) transformers with asymmetrical rotating transformers comprising one electrical port for "active" power (i.e., singly-fed), such as Induction, permanent magnet, reluctance electric machines, and with symmetrical rotating transformers comprising two electrical ports for "active" power (i.e., doubly-fed or "synchronous" doubly-fed as only provided by SS-EMS technology).  Since induction ceases to exist between the rotor and stator winding sets at (or closely about) synchronous speed (i.e., slip-induction discontinuity about synchronous speed), a symmetrical rotating transformer cannot rely on speed-based induction (or asynchronous slip between the rotor and stator winding sets) for the induction of current and the production of torque. As a result of brushless real time control (BRTC) providing an independent port for brushless rotor excitation, the SS-EMS is a synchronous doubly-fed (i.e., two ports or symmetrical rotating transformer without reliance on speed-based induction) with all other electric machine systems as synchronous or asynchronous singly-fed or asynchronous doubly-fed that rely on speed-based induction, which is discontinuous about synchronous speed.


NOTE: In accordance to the principles of the ideal symmetrical transformer operation, the flux production as a result of primary and secondary winding magneto-motive-force is neutralized once the port voltage is established in accordance to Faraday's Law.  As a result, a symmetrical transformer rotating electric machine system (i.e., a wound-rotor "synchronous" doubly-fed electric machine as only provided by SS-EMS technology) has at least one distinct advantage over all other electric machine systems: torque production (as a result of increasing torque current) can be factors higher than any other electric machine system without leading directly to core saturation. In contrast, increasing torque current beyond core saturation for all other electric machine systems becomes pure loss (or heat).


[Just The Facts For Comparisons]

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Note: The Radial Flux prototyping of the Advanced Brushless Wound-Rotor Synchronous Doubly-Fed Electric Motor Or Generator System is shown as our Icon, which predates the axial-flux SS-EMS Technology.


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