| CPC H02K 1/265 (2013.01) [H02K 1/28 (2013.01); H02K 7/003 (2013.01)] | 10 Claims |
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1. A rotor for an induction motor, the rotor comprising:
a rotor core having a hollow portion positioned on a central portion, wherein a shaft is coupled to the rotor core by being inserted through the hollow portion;
a plurality of slots radially formed on an inside of the rotor core around a central axis of the shaft;
a plurality of conductor bars coupled to the plurality of slots; and
an end ring electrically connecting the plurality of conductor bars to each other;
wherein the rotor core is thermally treated above Curie temperature to form a plurality of heat treatment portions each having a predetermined pattern on an outer circumference of the rotor core;
wherein the plurality of conductor bars have a skew structure in the rotor core;
wherein the plurality of slots and the plurality of conductor bars are not exposed when viewed radially from an outer circumferential surface of the rotor core;
wherein the predetermined pattern is formed side by side in a longitudinal direction of the plurality of conductor bars; and
wherein each of the plurality of heat treatment portions is in contact with each of the plurality of conductor bars.
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