The document classifies electric drives into three categories: group drive, individual drive, and multi-motor drive. A group drive uses a single motor to power multiple machines connected to a common shaft, making it the most economical but least flexible option. An individual drive uses a separate motor for each machine, allowing each to be controlled independently but resulting in power losses. A multi-motor drive assigns a dedicated motor to power each component of a machine, providing flexibility to run parts independently at the cost of higher initial expenses.

1. Presented by
Dr. R. RAJA, M.E., Ph.D.,
Associate Professor, Department of EEE,
Muthayammal Engineering College, (Autonomous)
Namakkal (Dt), Rasipuram – 637408
MUTHAYAMMAL ENGINEERING COLLEGE
(An Autonomous Institution)
(Approved by AICTE, New Delhi, Accredited by NAAC, NBA & Affiliated to Anna University),
Rasipuram - 637 408, Namakkal Dist., Tamil Nadu, India.
Classification of Electric Drive
with Advantage and Disadvantage

2. Classification of Electric Drive
Generally classified into 3 categories:
I. Group drive
II. Individual Drive
III. Multimotor Drive
Group Drive :
 If several group of mechanisms or machines are organized on one shaft and
driven or actuated by one motor, the system is called a group drive or shaft
drive.
Advantage :
 Most Economical
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3. Disadvantage:
 Any Fault that occurs in the driving motor renders all the driving equipment
idle.
 Efficiency low because of losses occurring in the energy transmitting
mechanisms (Power loss)
 Not safe to operate.
 Noise level at the working spot is high.
 Flexibility.
Single motor drives a no of machines through belt form common shaft.
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4. Individual Drive:
 If a single motor is used to drive or actuate a given mechanism and it does all
the jobs connected with this load , the drive is called individual drive.
 All the operations connected with operating a lathe may be performed by a
single motor.
 Each motor is driven by its own separated motor with the help of gears , pulleys
etc.
Disadvantage:
 Power loss occurs.
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5. Multi Motor Drive:
 Each operation of the mechanism is taken care of by a separate drive motor.
 The System contains several individual drives each of which is used to operate
its own mechanism.
 Separate motors are provided for actuating different parts of the driven
mechanism.
Disadvantage:
 Initial high cost.
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6. Advantage :
 Each Machine is driven by a separated motor it can be run and stopped as
desired.
 Machines not required can be shut down and also replaced with a minimum of
dislocation.
 There is a flexibility in the installation of different machine’s.
 In the case of motor fault, only its connected machine will stop where as others
will continue working undisturbed.
 Absence of belts and line shafts greatly reduces the risk of a accidents to the
operating personnel.
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7. Thank You
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