Brushless wound-rotor doubly-fed electric machine

The Brushless wound-rotor [synchronous] doubly-fed electric machine (i.e., electric motor or electric generator) incorporates the most optimum electromagnetic core structure of any electric machine, which is the core structure of the wound-rotor doubly-fed electric machine, but without the Achilles' Heel of the wound-rotor doubly-fed electric machine, which are the multiphase slip ring assembly and control instability. Development of the brushless wound-rotor [synchronous] doubly-fed electric machine is limited. One such company is Best Electric Machines (http://www.bestelectricmachine.com). See also Wound-Rotor Doubly-Fed Electric Machine, Brushless Doubly-Fed Electric Machine, and Doubly-Fed Electric Machine.