US 9,071,112 B2 · Squirrel-cage rotor and production method thereof

Abstract

A squirrel-cage rotor and a production method thereof, the rotor having conductors with sufficient strength. In the invention, conductor particles are sprayed onto a core and/or conductive bars in a solid-state. As a result, in the coating material, the enlargement of the crystal grain of the conductors is significantly restricted, whereby conductive end rings are connected to the core and/or the conductive bars. Since conductor particles do not melt, a gap formed by thermal contraction when the conductor melts between different kinds of members is prevented from being formed. Therefore, the deterioration of the conductor may be limited, and the conductor may have sufficient strength. The reliability of the rotor is improved.

Claims12

Dependent claims

A squirrel-cage rotor, comprising:

a core;
a plurality of slot holes formed in the core and extending along a rotation axis of the core;
conductive bars arranged in the slot holes;
and
a pair of conductive end rings arranged at both ends of the core defined in relation to a direction of the rotation axis of the core and connected to each other by the conductive bars,
wherein the slot holes are opened at an outer periphery surface of the core, the conductive bars are formed by a coating material which is formed by spraying solid-state conductor particles into the slot holes from the side of the outer periphery surface of the core, and
wherein at least one of the pair of conductive end rings is configured by a coating material which is formed by a cold spraying process in which solid-state conductor particles are sprayed.

4 more elements

Dependencies are inferred from the claim text.

Squirrel-cage rotor and production method thereof

Life of this patent

Squirrel-cage rotor and production method thereof

Life of this patent

Abstract

Claims12