Electric rotary machine
AssigneeHitachi, Ltd.
InventorsToshiaki Ueda, Takeshi Sakai, Susumu Terumoto, Toshinori Watanabe
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Abstract
In the stator of a electric rotary machine in which heat conductive insulation resin is filled at the end portions of a stator coil, the material of a stator core, the stator coil, the heat conductive insulation resin and a frame is selected such that a linear thermal expansion coefficient α1 of the stator core, a linear thermal expansion coefficient α2 of the stator coil, a linear thermal expansion coefficient α3 of the heat conductive insulation resin being filled and a linear thermal expansion coefficient α4 of the frame satisfy a relation that α1<α2 <α4 ≦α3. A cooling medium path is integrally formed within the frame made from aluminum through die casting molding.
Claims6
A electric rotary machine comprising:
- stator;
- electric rotary machine frame;
- and
- insulation resin filled between the stator and the electric rotary machine frame through injection molding, wherein the electric rotary machine frame is made from aluminum and includes a cooling medium path, and the insulation resin is unsaturated polyester resin which linear thermal expansion coefficient is equal to or larger than a linear thermal expansion coefficient of aluminum.
A electric rotary machine comprising:
- an annular stator core;
- stator coil wound around the stator core;
- frame fit in and fixed to an outer peripheral portion of the stator core;
- and
- heat conductive insulation resin filled into slot portions of the stator core in which the coil is inserted and also filled at end portions of the stator coil between both end surfaces of the stator core and inner periphery of the frame, wherein a linear thermal expansion coefficient a1 of the stator core, a linear thermal expansion coefficient a2 of the stator coil, a linear thermal expansion coefficient a3 of the heat conductive insulation resin being filled and a linear thermal expansion coefficient a4 of the frame are set to have a relation that α1<α2<α4≦α3, wherein the stator core is a laminated core formed by a rolled plate or a silicon steel plate, the stator coil is an enamel wire formed by coating heat resistant insulation resin film over a copper wire, the heat conductive insulation resin being filled is formed by unsaturated polyester, and the frame is formed by aluminum die-cast, and
- wherein the frame is configured in a bowl shape at its one side, and wherein the stator core around which the core is wound is inserted and fit into in an axial direction from the opened portion of the frame opposing to the bowl shaped portion and fixed, then the heat conductive insulation resin is injected into the frame through a resin injection port provided at the bowl shaped bottom portion of the frame thereby to integrally mold the stator core, the coil and the frame.
Dependencies are inferred from the claim text.