LEESON Basic Training - iProcesSmart.com

Insulation: In motors, classified by maximum allowable operating temperature.NEMA classifications include: Class A = 105°C, Class B = 130°C,Class F = 155°C and Class H = 180°C.Input Horsepower: The power applied to the input shaft of a gearreducer. The input horsepower rating of a reducer is the maximum horsepowerthe reducer can safely handle.Integral Horsepower Motor: A motor rated one horsepower or largerat 1800 RPM. By NEMA definitions, this is any motor having a three digitframe number, for example, 143T.Inverter: An electronic device that changes direct current to alternatingcurrent; in common usage, an AC drive.Kilowatt: A unit of power equal to 1000 watts and approximately equalto 1.34 horsepower.Load: The work required of a motor to drive attached equipment.Expressed in horsepower or torque at a certain motor speed.Locked Rotor Current: Measured current with the rotor locked and withrated voltage and frequency applied to the motor.Locked Rotor Torque: Measured torque with the rotor locked and withrated voltage and frequency applied to the motor.Magnetic Polarity: Distinguishes the location of north and south polesof a magnet. Magnetic lines of force emanate from the north pole of a magnetand terminate at the south pole.Mechanical Rating: The maximum power or torque a gear reducer cantransmit. Many industrial reducers have a safety margin equal to 200% ormore of their mechanical rating, allowing momentary overloads duringstart-up or other transient overloads.Motor Types: Classified by operating characteristics and/or type of powerrequired. The AC induction motor is the most common. There are severalkinds of AC (alternating current) induction motors, including, for singlephaseoperation: shaded pole, permanent split capacitor (PSC), splitphase, capacitor start/induction run and capacitor start/capacitor run.-73-