2. What is drive
System employed for motion controlled are
called drive.
So we say when a systems employed for
motion controlled then such system are called
drives.
And what that drives system employees an
electrical motors for creating some motion
electrically is known as electrical drive.
3. An electrical drive can be defined as an
electromechanical energy tp impact motion to
different machines and mechanisms for various kinds
of process control.
Generally a drive system is basically has a
mechanical load a transmission sysytem and prime
mover may be I.C engine,stteam engine.
4. Advantages
Flexiable control characterstics.
Startinof g and breaking is easy and simple.
Provide a wide range of torques over a wide
range of speed (both ac and dc motor)
Availabilty of wide range of electrical power
Works to almost may any type of enviromental
conditions.
No exhaust gases emitted.
Can be started and acceleration at very short
time
6. Component of electrical drive
Power source
Power modulator
Controller
Motor
Sensing unit
Mechanical load
7. Power source
The power source provides the energy to the
drive system it may be dc or ac very low power
drivers are generally feel from single phase
sources rest of the drives is powered from a 3
phase source low and medium power motors
ared fed from a 400vsupply for higher rating
motors may be rated 3.3kv, 6.6kv and 11kv
8. Power modulator
The converter intefaces the motor with the
power source and provides motor with
adjustable voltage, current and frequencey
during transient provide such as starting
breaking and speed reversal.
Types of modulator
Controlled rectifier
Inverter
Ac volttage regulator
Dc chopper
Cyclo cnverter.
9. Types of Drives
(1)Indivisiual drive
(2)Group drive
(3)Multi motor drive
According no. of machies
According to mode of operation
(1)Continoues duty drives
(2)Short time delay drivers
(3)Intermittent duty drivers
(4)Intermittent duuty with starting
