Abstract: A symmetrical, figure 8 shaped, magnetic circuit is provided with reduced size end loops each including an electromagnetic reverse winding which, when excited, opposes the adjacent magnetic flux. A further set of forward windings adjacent each end loop is selectively turned on for developing such flux. As a result of sequential complementary switching of the reverse and forward windings, the center element of the magnetic circuit is impressed with an alternating magnetic flux for inducing power. An asymmetrical and a singly fed rotary power embodiment are also set out for operation in accordance with the foregoing principles.