Rotor cooling structure for induction motor

A rotor cooling structure comprising:

• a turbine blower structure provided on first and second sides of a rotor for an induction motor;
• a refrigerant passage provided along conductor bars of the rotor and including:
• a plurality of refrigerant passage inlet openings provided on a bottom surface of the turbine blower structure;
• a plurality of refrigerant passage outlet openings provided at an axial center of the rotor;
• and
• a plurality of internal refrigerant passages fluidically connecting the refrigerant passage inlet openings and the refrigerant passage outlet openings;
• and
• a plurality of groove patterns that holds the refrigerant passage outlet openings therein and is provided on first and second axial sides of the rotor on an external periphery of the rotor,
• wherein the groove patterns are chevron patterns, each with a pointed portion holding the refrigerant passage outlet openings therein, and
• wherein the groove patterns are formed in a zig-zag manner on the first and second sides of the rotor with respect to an axial central cross-section of the rotor.

A rotor cooling structure comprising:

• a turbine blower structure provided on first and second sides of a rotor for an induction motor;
• a refrigerant passage provided along conductor bars of the rotor and including:
• a plurality of refrigerant passage inlet openings provided on a bottom surface of the turbine blower structure;
• a plurality of refrigerant passage outlet openings provided at an axial center of the rotor;
• and
• a plurality of internal refrigerant passages fluidically connecting the refrigerant passage inlet openings and the refrigerant passage outlet openings;
• and
• a plurality of groove patterns that holds the refrigerant passage outlet openings therein and is provided on first and second axial sides of the rotor on an external periphery of the rotor,
• wherein the refrigerant passage is provided to penetrate the conductor bars.