Abstract: A rotary machine such as a motor or generator is disclosed wherein the rotor has three magnetic components. One of the components also acts as a rotor frame. The rotor frame has a group of wedge-shaped openings which are evenly spaced and peripheral to the frame. Another magnetic component, permanently magnetized and hollow on its inside, is also wedge-shaped and is inserted in each first mentioned wedge-shaped opening of the frame. A third magnetic component, conforming to the hollow inside surface of the permanent magnet is buried within and thereby surrounded by each such hollowed magnet. Such third magnetic component is solid throughout its entire cross-section. The wedge-shaped structures of the rotor provide the required magnetic polarities and field for coacting with the fields provided by the stator.