An electric drive is a system that controls the motion of an electric motor. It consists of an electric power source, power modulators to regulate power flow from the source to the motor, a motor, sensors for feedback, and a controller. Power modulators can include AC to DC converters, DC to DC converters, and AC to AC converters. The type of motor used depends on factors like the load characteristics. Sensors measure parameters like motor speed and current. The controller then generates control signals to the power modulator based on sensor feedback to extract the desired output. Electric drives are used in applications like transportation systems, rolling mills, machine tools, and pumps.

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ELECTRIC DRIVE
Dr. A. Ravi
Professor/EEE
FRANCIS XAVIER ENGINEERING COLLEGE
TIRUNELVELI INDIA

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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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