A rotary electric machine that controls fluid pressure and loss of cooling air, increases the cooling air flow rate, and is able to favorably cool the end of a coil with little regard to the positional relationship between the centrifugal blades and the end of the stator coil, is disclosed. A cooling fan of such a rotary electric machine includes centrifugal blades having deflecting blades disposed therebetween, which are mounted so as to incline towards an inside of the axial direction. The centrifugal blades and the deflecting blades are integrally formed. For this reason, the cooling air accelerates at areas between the individual blades in the centrifugal direction and is separated into two flows, one in the direction of inside portions and one in the direction of outside portions of the end of a stator coil. The end of the stator coil is cooled favorably. Thus, the eddy produced at the inside portions in the end of the stator coil is suppressed from flowing to the outside portions, and increases in fluid pressure loss are prevented.
On a traction machine motor wherein both a rotor (6) and a driving sheave (10) are attached on the rotating shaft (5), which is supported by both a motor bracket (1) and a bearing stand (2), and a motor frame (7) which supports the stator (8) is connected to the motor bracket (1), a gap (G.sub.5) is provided between a spigot joint (18) which is concentric with the rotating shaft (5) and an arcuate part (19) to indirectly measure a bias in the circumferential direction of the gap (G.sub.4).
To provide a flat motor device capable of suppressing a thermal effect on a peripheral environment. When currents are supplied to armature coils 34 confronting a pole unit 40, a wafer stage WST is driven along a moving surface 32a by electromagnetic force. With this operation, the armature coils 34, to which the respective currents are supplied, generate heat. The armature coils 34 are disposed in the interior of a base 32 along the moving surface. A first fluid passage 62, in which a first fluid flows in a laminar flow state, is disposed to the armature coils on the moving surface side thereof and a second fluid passage 64, in which a second fluid flows in a transition flow state, is disposed thereto on the side opposite to the moving surface, respectively. Therefore, a temperature boundary layer is formed in the flow of the first fluid, whereby the transmission of the heat of the armature coils 34 to the moving surface is effectively prevented as well as the heat can be effectively removed from the armature coils 34 by the second fluid by an increase in the heat transfer coefficient between the second fluid and a stator yoke 58.
Coil ends (19) of a stator coil (18) having a cross sectional shape like a flat rectangular are constructed by first portions extending from an outer layer of a pair of slots apart from predetermined pitches in an axial direction and slanting in a circumferential direction, second portions extending from an inner layer of the other of the pair of the slots in the axial direction and slanting in the circumferential direction, and third portions positioned at ends of the coil ends (19) in the axial directions, elongated in the radial direction and connected to ends of the first and second portions in the axial direction, and in all of the first, second and third portions, long sides (300) of the cross sectional flat rectangular view of the stator coil (18) are arranged to be substantially in parallel with an end surface of the stator whereby the coil ends are lowered; and the coils are arranged without a gap.
In an alternating current generator and fans thereof in accordance with the invention, the cooling efficiency of the alternating current is improved by fans fixed to a rotor. When the fans are formed during a press working operation, the blades are formed directly from the fans by cut-raising the fans toward a bracket side to form blades and simultaneously cut-raising protruding potions toward a rotor side to form protrusions. This design allows for both improvement in cooling efficiency of the alternating current generator and ease of manufacture of the fans.
