Category N motors have starting torque, starting current and normal slip (less than 5%) and can be used to drive loads where high starting torques such as pumps, fans and machine tools are not required.
Category NY Motors: They are motors with similar characteristics with normal category N engines, but are intended for starting star-triangle. In the star connection the starting torque is 25% of the value indicated for Category N engines.
Motors Category H: have high starting torque, normal slip start current. They are used where a starting torque above normal is required, such as in high inertia loads, conveyors, crushers, etc.
Motors Category HY: They are motors with similar characteristics with the motors category H, but foreseen for start star-triangle. In star connection the starting torque is 25% of the value indicated for category H electric motors.
Category D motors: have high starting torque, high starting current, high slip (greater than 5%). They are used in cases where extremely high starting torques and limited starting currents are required, such as in elevators.