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Chapter: Electrical Drives & Control : Introduction to Electrical Drives

Load Conditions in Motor

1. Classification of loads 2. Different type of industrial loads



The load requirements are in either of

·         Speed control


·         Torque control


Depending upon the load requirements the motor has to be chosen.


For example in traction system the load (traction network) needs high starting torque (initiali.e.,high current value is needed at t6he start. A series motor provides a high starting torque as .Hence series motor should be chosen for traction system.


1. Classification of loads


1.     Torque dependent on speed

(Ex-hoists, pumping of water or gas against constant pressure)


2.     Torque linearly dependent on speed

(Ex- motor driving a DC generator connected to a fixed resistance load [generator field value is kept constant])


3.     Torque proportional to square of speed

(Ex- fans, sentrifugal pumps, propellers)


4.      Torque inversely proportional to speed

(Ex-milling and boring, machines)


2. Different type of industrial loads


There are three types of industrial loads under which electric motors are required to work. they are


v        Continuous load

                        Intermittent load


                        Variable or fluctuating load


            Continuous load


                    Load is continuous in nature


                    Ex- Pumps or fans require a constant power input to keep them operating.


Ø        Intermittent load


                    This type classified in to two types


                    Motor loaded for short time and then shunt off for sufficiently longer duration temperature is brought to the room temperature


Eg: kitchen mixie.


                    The electrical loss is more due to constant ON/OFF delay period


                    Moor loaded for short time and shunt off for short time .


                    Here the motor cannot be cooled down to the room temperature comparison of the two methods it can be Inferred.


                    The temperature level of motor is not brought to the room temperature.

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Electrical Drives & Control : Introduction to Electrical Drives : Load Conditions in Motor |

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