Abstract: In the embodiments described in the specification, permanent magnets are retained on a permanent magnet rotor rim by inverted U-shaped retainers and in one embodiment the outer surfaces of the retainers converge inwardly in the radially outward direction and engage corresponding surfaces of adjacent pole pieces which converge inwardly in the radially outward direction. In another embodiment the U-shaped retainers are affixed to the rotor rim by screws accessible through openings in the radially outer wall of the retainers and a further embodiment each retainer has outwardly projecting flanges which are affixed to the rotor rim by screws.

Abstract: In the embodiments described in the specification, an electric motor has a stator with an inner cylindrical composite can member affixed to the stator housing by screws and the rotor has an outer cylindrical can member affixed to the rotor by screws, each of the composite can members being sealed to the component to which it is affixed by O-rings. In one embodiment ridges are formed in the surface of one of the composite can members facing the space between the stator and the rotor to control the flow of liquid through the space.

Abstract: In the embodiments described in the specification, permanent magnets are retained on a permanent magnet rotor rim by inverted U-shaped retainers and in one embodiment the outer surfaces of the retainers converge inwardly in the radially outward direction and engage corresponding surfaces of adjacent pole pieces which converge inwardly in the radially outward direction. In another embodiment the U-shaped retainers are affixed to the rotor rim by screws accessible through openings in the radially outer wall of the retainers and a further embodiment each retainer has outwardly projecting flanges which are affixed to the rotor rim by screws.

Abstract: In the embodiments described in the specification, a permanent magnet machine has a stator assembly containing a circular array of stator windings and a rotor assembly containing passages for permanent magnets and supported for rotation within the stator windings. The rotor assembly contains dummy magnet blocks in each passage during assembly of the rotor assembly in the stator assembly and a loading fixture containing energized permanent magnets is aligned with each passage in succession into which it supplies a row of permanent magnets while the dummy magnet blocks are removed by a retrieving fixture at the opposite end of the passage. After the permanent magnets have been inserted an end cover is mounted at each end of the passage to hold the energized permanent magnets in position.

Abstract: In the rotor arrangement disclosed in the specification a rotor has a central shaft with a surrounding rim to which a circumferential array of pole pieces is mechanically affixed by screws. An array of permanent magnets each mounted between an adjacent pair of pole pieces is radially retained in position by a slot wedge having edges shaped to interlock with the outer side portions of the adjacent pole pieces. The outer surfaces of the pole pieces and slot wedges form a uniform cylindrical outer surface which is covered by an outer wrap of fiber reinforced polymer material to assure that the magnets are retained radially in position.