A variable speed machine assembly includes an input shaft, a variable speed magnetically geared generator coupled to the input shaft, an electrical machine coupled to the input shaft, and a power converter coupled to the variable speed magnetically geared generator and the electrical machine. The wind turbine is characterized in that the main bearing unit includes at least one outer ring, at least one center ring and at least one inner ring and wherein the center ring is capable of rotation in relation to the outer ring and the inner ring or the outer ring and the inner ring are capable of rotation in relation to the center ring. A spring urges the plunger toward the bar to pinch the tube closed. The brassiere also has a cushioning device.