Type A: Regular starting torque (usually 150-170% of rated), corresponding to high starting current. The ultimate torque is the highest of all NEMA types. Can handle heavy loads in a short time. The slip is less than or equal to 5%. A typical application is the motor of injection molding machinery. 

Type B: The most common type of AC induction motor. Its starting torque is similar to that of type A, but sometimes even lower, providing a lower starting current. However, it locks the rotor torque in industrial applications and still allows starting loads. The slip is less than or equal to 5%. The motor efficiency and full-load power factor are relatively high. Typical applications include pumps, fans, and machines

Type C: Provides high starting torque (higher than types A and B, usually more than 200% of rated). It is often used to drive heavy starting loads. These motors can run at almost full speed without overloading. Low starting current. The slip is less than or equal to 5%.

Type D: Among all NEMA motor types, it is the motor that can provide the highest starting torque. Starting current and full load speed are low. With high slip values (5-13%), the motor is suitable for machines with no load changes or no drastic changes in the motor operating speed, such as flywheel energy storage. Many types have sub-categories that also include wider slip ranges. This motor type is generally custom-made. The speed-torque characteristics of these motors vary. Stator-rotor torque (starting torque) refers to the minimum torque, which is generated when the rotor stops at this time for rated voltage and frequency. Breakdown torque is the maximum torque, which is generated before the sudden motor speed reduction, and the rated speed (rated voltage and frequency) occurs. Pull-up torque is the minimum torque, which is generated when the motor speed goes from standstill to the speed point, at which the breakdown torque occurs.

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