Thin strips: a cross-section of this guidance bar thinner. Causes of centrifuge speed is too high, the centrifugal force is too large, resulting in the groove bottom guide bar did not cast full (short-selling); core wrong piece, slot slash is not a straight line, impede the flow of molten aluminum; core preheating temperature is low, excessive temperature drop of the liquid aluminum, the fluidity deteriorates.

    Centrifuge speed is too low poured dissatisfaction with the cold compartment: Cause low temperature of liquid aluminum, differential mobility; casting too slow or stop the phenomenon; core and the mold preheating temperature is low; insufficient amount of leakage of aluminum or aluminum; centrifugal force is too small, molten aluminum can not be filled to the top of the blades.

    Rotor resistance is too large: The reason there the groove slope is greater than the specified value, the guide bar resistance increases; improper the Thanh Hoa treatment of liquid aluminum, contains a lot of impurities; pore shrinkage and cracks in the guide bar.

    Stray loss: Causes groove slope is too; contact resistance between the guide bar and the core is too small, common pressure-cast aluminum rotor.

    At the top of the blades pouring a small amount of dissatisfaction or cold shuts, no significant effect on motor performance; broken rotor bars so that the motor can not be started; porosity, shrinkage, shrinkage, thin strips and cracks, etc. rotor resistance and loss will increase efficiency and minimum torque reduction, increased slip and temperature rise.