This document discusses permanent magnet brushless DC motors (BLDCM). It begins by explaining that BLDCMs are generated by inverting the stator and rotor of a PM DC motor, and are fed by a rectangular AC waveform. This has the advantage of removing brushes and their associated problems, while allowing for larger torque production. The document goes on to classify motors and discuss brushed motors, BLDCM workings, applications, advantages like higher efficiency, and disadvantages like higher cost compared to brushed motors.

1. Contents…
• Abstract.
• Introduction.
• Basics of a motor.
• Classification.
• Brushed motors.
• BLDCM.
• Working procedure.
• Applications.
• Advantages.
• Disadvantages.
• Conclusion.
• Reference.

2. Abstract…
• Permanent magnet (PM) brushless DC motors
(BLDCM) are generated by virtually inverting the
stator and rotor of PM DC motors.
• These motors are actually fed by rectangular AC
waveform.
• The advantage is the removal of brushes, leading
to eliminate many problems associated with
brushes.
• Another advantage is the ability to produce a
larger torque because of the rectangular
interaction between current and flux.

3. Introduction…
• Classical DC motors are no doubt good and
simple but inefficient in some ways.
• Although dc motors possess good control
characteristics and ruggedness, their
performance and applications are inhibited due
to sparking and commutation problems.
• The Permanent Magnet Brushless DC (PMBLDC)
motor is able to overcome the limitations
mentioned above and satisfy the requirements of
a variable speed drive.

4. MOTOR…
 MOTOR…
>> Converts electrical energy to
mechanical energy.
 ORIGIN...
>> Nicola Tesla introduces electric motor
in December 1889.
>> He identifies the principle of rotating
magnetic field.

5. Main parts of brushed motor...
 Commutator :
>> Facilitate collection of current
from the armature
conductors.
 Brush :
>> Collects current from the
commutator.

6. Classification…