Factors Influencing the Choice of Electrical Drives

FACTORS INFLUENCING THE CHOICE OF ELECTRICAL DRIVES

·        Nature of electric supply

^o     Whether AC or DC supply is to be used for supply

·        Nature of the drive

^o     Whether the particular motor is going to drive individual machine or a group of machines 

(iii)Capital and running cost

·        Maintenance requirement

·        Space ad weight restrictions

·        Environment and location

·        Nature of load

^§    Whether the load requires light or heavy starting torque

^§    Whether load torque increases with speed remain constant

^§    Whether the load has heavy inertia which may require longer straight time

·        Electrical characteristics of motor

^§    Starting characteristics,

^§    running characteristics,

^§    speed control and

^§    Braking characteristics

·        Size, rating and duty cycle of motors

^§    Whether the motor is going to the operator for a short time or whether it has to run continuously intermittently or on a variable load cycle

o   Mechanical considerations

^§    Type of enclosures, type of bearings, transmission of drive and Noise level.

^§    Due to practical difficulties, it may not possible to satisfy all the above considerations.

^§    In such circumstances, it is the experience and knowledge background which plays a vital role in the selection of the suitable drive.

The following points must be given utmost important for the selection of motor. 

The factors are:

^t        Nature of the mechanical load driven

^t        Matching of the speed torque characteristics of the motor with that of the load

^t        Starting conditions of the load.