Motor rotor and its mfg. method, motor, brushless motor, compressor, refrigerator and air conditioner

Even to the present invention there is provided a hermetic compressor provided for the air vent is rarely causes increased reluctance, the rotor and reduced output efficiency synchronous induction motor. Characterized in that it has a groove and an induction torque is generated by the reluctance torque with a slit, and the slit-line groove is filled aluminum, the ends of the rotor with shorting end aluminum rings filled in narrow disposed axially extending through the unfilled portion not filled with aluminum sewing.