ROTARY MACHINE

PROBLEM TO BE SOLVED: To achieve efficient heat extraction from a rotor and a stator core by a simple processing configuration without unnecessarily increasing solidity of the rotor.SOLUTION: A stator core 3 having spiral groove parts 3c on tip surfaces 3b of teeth 3a is formed by laminating six sorts of steel plates 31 (31a to 31f) on which positions of recesses 37 formed on tips of teeth 35 are mutually different in a peripheral direction of a york 33 (rotation direction of a rotor 5). Since the steel plates 31a to 31f on which the positions of the recesses 37 are mutually different can be easily formed by press working such as die cutting, a forced flow of refrigerant is formed on an air gap G by an easy processing configuration without forming projections or grooves by unnecessarily increasing rigidity of the rotor 5 and efficient heat extraction from the stator core 3 and the rotor 5 can be achieved.