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ELECTRIC DRIVE

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Electric Drive
The system which is used for controlling the
motion of an electrical machine, such type of
system is called an electrical drive.

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Electrical power
source (AC or DC)
is needed to drive
the electric motor.
Electric Drive-Components

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Power modulators
regulate the power
flow from source to
the motor
AC to DC Converters
DC to DC Converters
DC to DC Converters
AC to AC Converters
Electric Drive-Components

5. FUNCTIONS OF POWER MODULATORS
 The power modulator converts the energy according to
the requirement of the motor.
 Adjusts the mode of operation of the motor that is
motoring, braking are regenerative.
 They contain and control the source and motor currents
with in permissible limits during the transient operations
such as starting, braking, speed reversal etc.
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Electric Drive

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The type of motor
used depends upon
many factors like
Characteristics of
load,
Electric Drive-Components
D. C. Series motor
D. C. Shunt motor
D. C. Compound motor
Synchronous motor
Induction Motor
A. C. Series Motor etc .,,

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The load may be a
machine, pump,
compressor, electric
locomotive, machine
tool, elevator etc..
Electric Drive-Components

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Sensors are used
in automatic closed
loop system.
Electric Drive-Components
They measure
various parameter like
motor speed, supply
voltage, current etc
and control the motor
output.

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It controls the power
modulator and extract
the desired output
from the converter.
Electric Drive-Components
Generate the control
signal to the power
Modulator

10.  The electric drive has very large range of torque,
speed and power.
 Their working is independent of the environmental
condition.
 The electric drives are free from pollution.
 The electric drives operate on all the quadrants of
speed torque plane.
 The drive can easily be started and it does not
require any refuelling.
 The efficiency of the drives is high because fewer
losses occur on it. 10
Advantages of Electric Drives

11.  The application of the drive is limited because it
cannot use in a place where the power supply is
not available.
 It can cause noise pollution.
 The initial cost of the system is high.
 It has a poor dynamic response.
 The output power obtained from the drive is low.
 During the breakdown of conductors or short
circuit, the system may get damaged due to which
several problems occur.
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Disadvantages of Electric Drives

12.  transportation systems
 rolling mills
 paper machines
 textile mills
 machine tools
 fans, pumps, robots and
 washing, etc.
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Applications of Electric Drives

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