Dynamic interference variation testing device for interference connection of motor rotor and main shaft

The utility model discloses a dynamic interference variation testing device for interference connection of a motor rotor and a main shaft. The dynamic interference variation testing device comprises the main shaft (4), an outer sleeve (7), the motor rotor (8), a motor stator (9), an inner sleeve (13) and a displacement sensor (16), the inner side wall of the right portion of the outer sleeve is in sliding fit with the conical side wall of the left portion of the inner sleeve, the variable quantity of the radial interference magnitude is converted into the axial displacement quantity, the displacement sensor is connected with the right end of the main shaft to measure the displacement quantity of sliding fit, and then the interference variable quantity is calculated. Therefore, the dynamic interference variable quantity of the electric spindle can be measured in the operation process of the electric spindle, the interference variable quantity changing along with the speed can be measured, and the interference