Rotor of rotary machine
AssigneeMitsubishi Electric Corporation
InventorYutaka Ikura
Life of this patent
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Abstract
A rotor of a rotary machine includes a ring-like fixing member press-fit and fixed to a shaft so as to limit a position of a rotor core in a shaft axial direction and an end plate fixed to an outer peripheral side of the fixing member so as to limit a position of a magnet, embedded in the rotor core, in the shaft axial direction. Influences of a difference in thermal expansion between the shaft and the end plate are lessened by the fixing member. A material is selected so that a value of a coefficient of linear expansion of the fixing member becomes equal to an intermediate value between a coefficient of linear expansion of the shaft made of iron and a coefficient of linear expansion of the end plate made of a non-magnetic body.
Claims4
A rotor of a rotary machine comprising:
- a shaft;
- a rotor core fixed to the shaft;
- a ring shaped fixing member press-fit and fixed to the shaft so as to limit a position of the rotor core in a shaft axial direction;
- and
- an end plate fixed to an outer peripheral side of the fixing member so as to limit a position of a magnet, embedded in the rotor core, in the shaft axial direction,
- a value of a coefficient of linear expansion of the fixing member being an intermediate value between a coefficient of linear expansion of the shaft and a coefficient of linear expansion of the end plate, and influences of a difference in thermal expansion between the shaft and the end plate being lessened by the fixing member;
- wherein the fixing member is made of a thin metal material and has substantially a U-shaped cross section;
- wherein the U-shaped cross section includes a first portion extending axially, a second portion extending radially outward from the first portion and a third portion extending axially from an radially outermost portion of the second portion.
Dependencies are inferred from the claim text.