Brushless DC motors are synchronous motors powered by a DC electric source via an integrated inverter, which produces an AC electric signal to drive the motor. They were developed from Michael Faraday's early experiments with electromagnetic induction in the 1800s. Brushless DC motors have no brushes or commutators, requiring no maintenance with a much longer operating life compared to regular DC motors. They find applications in instrumentation, medical devices, appliances, automotive systems, factory automation, aerospace and military due to their high efficiency, rapid response and lack of sparking or emissions.

1. BRUSHLESS DC MOTOR
Biplab Nayak
Regd. No.- 0901321003
Branch-EEE, 7th semester
Bhubaneswar Institute of Technology

2. WHAT IS BRUSHLESS DC
MOTOR ?
Brushless DC motors
are synchronous motors which
are powered by a DC electric
source via an integrated
inverter, which produces an
AC electric signal to drive the
motor.

3. HISTORY OF BRUSHLESS DC
MOTOR
 British scientist Michael Faraday first
experimented with the idea of the electromagnetic
induction motor in the early 1800’s.
 During that time, DC Motors did not contain
permanent magnets. Instead, they operated
similar to Brush DC Motors today, in that they had
current flowing through the windings of the motor.
In 1837 Americans Thomas and Emily Davenport
transformed Faraday’s DC Motor into one that
could be used for commercial use. These DC
Motors became popular in printing presses and
powered machine tools.

4. EQUIVALENT BLOCK DIAGRAM OF
BRUSHLESS DC MOTOR

5. ADVANTAGES OF BRUSHLESS DC
MOTOR
No maintenance.
Much longer operating life.
No risk of explosion or possibility of RF
radiation due to arcing, higher
efficiency, rapid response etc.

6. DISASSEMBLED VIEW OF
BRUSHLESS DC MOTOR

7. CONSTRUCTION OF BRUSHLESS DC
MOTOR
 Brushless motors can be constructed in several
different physical configurations.
 In the 'conventional' configuration, the permanent
magnets are part of the rotor.

8. COMPARISON OF
CONVENTIONAL AND
BRUSHLESS DC MOTOR

9. BRUSHLESS DC MOTOR MAY
BE CONTROLLED BY
 Voltage-Fed Inverter
Current-Fed Inverter

10. BLOCK DIAGRAM OF VOLTAGE-FED
CONTROL

11. BLOCK DIAGRAM OF CURRENT-
FED CONTROL

12. IF THE BRUSHLESS DC MOTOR
RUNS IN IMPROPER WAY OR
STOPS RUNNING, THEN HOW
CAN THIS PROBLEM BE
SOLVED?

13. BRUSHLESS DC MOTORS

14. APPLICATIONS OF BRUSHLESS DC
MOTOR
 Instrumentation
 Medical
 Appliances
 Automotive
 Factory Automation Equipment
 Aerospace
 Military

15. CONCLUSION
 Although Brushless DC Motors are more expensive
of the same kW rating than conventional DC Motor
but there are many advantages.
 Brushless DC Motors can run when submerged in
fluids.
 Brushless DC Motor does not produce brush or
commutator particles or gases as by-products of
operation.

16. REFERENCE
 J.B. Gupta 2011. Theory & Performance of
Electrical Machines. 14th Ed. Katson Books
 Dr. P.S. Bimbhra 2011. Power Electronics. 4th Ed.
Khanna Publishers
 http://www.anaheimautomation.com

17. THANK YOU