The utility model provides a small -size high speed motor rotor for drive compressors, it includes rotor solid shaft and rotor cage strip, be connected through trilateral attachment weld between rotor cage strip along the circumference evenly distributed, solid shaft and rotor cage strip as an organic whole, solid shaft chooses alloy steel 25Cr2Ni4MoV for use, and it is the component parts of rotor magnetic circuit, need bear the mechanical stress of rotor during operation again, rotor cage strip comprises the better T2 copper bar of electric conductivity. The utility model discloses can satisfy electric motor rotor in high -speed operation down, the geometry far is lighter than the well slowspeed machine that output is the same, and it is little to have an inertia, and dynamic response is fast, high transmission efficiency, stability characteristics such as get well.