FACTORS INFLUENCING THE
CHOICE OF ELECTRICAL DRIVES
of electric supply
AC or DC supply is to be used for supply
of the drive
o Whether the particular motor is going to drive individual machine or a group of machines
(iii)Capital and running cost
§ Whether the load requires light or heavy
§ Whether load torque increases with speed remain
§ Whether the load has heavy inertia which may
require longer straight time
characteristics of motor
§ Starting characteristics,
§ running characteristics,
§ speed control and
§ Braking characteristics
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
§ 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
The following points must be given utmost important for the selection of motor.
The factors are:
of the mechanical load driven
of the speed torque characteristics of the motor with that of the load
conditions of the load.