 |
DEFINITIONS
The terms used frequently in intermittent duly drive and hoisting are as bellow :
Duty :
Operation of the motor at load including no load and de- energised period to which the motor is subjected, including the sequence and duration.
Cyclic duration factor (CDF) :
The ratio between the period of loading including starting and electric braking and the duration of the duty- cycle expressed as percentage.
Starting :
The process of energizing a motor to bring it upto rated speed from rest.
Jogging or inching :
This is an incomplete start during which the motor does not attain more than 25% of the rated speed.
Electric braking :
A system in which a braking action is applied to an electric motor by causing it to act as a generator.
D.C Injection braking :
A form of braking of an induction motor in which a separate dc supply is used to magnetise the motor.
Plug braking :
A form of electric braking of an induction motor obtained by reversing the phase sequence of its any two lines.
Regenerative braking :
A system of electric braking in which energy is returned to the supply system.
<< Previous Page |
|
|
|
