9 March 2020

Brushless DC motor advantages and disadvantages

Brushless DC motor typically consists of a permanent magnet rotor and a coil would stator. This design by using a permanent magnet in the rotor eliminates the need for brushes in the rotor part. Here this post gives the advantages and disadvantages of brushless DC motor to better understand this topic.

Advantages of the brushless DC motor:
  • High efficiency.
  • Higher speed ranges.
  • Operated effectively.
  • Reduced Size. 
  • High dynamic response.
  • Better speed versus torque characteristics.
  • Noiseless operations.
  • Less power maintenance.
  • More efficient.
  • Longer life span.
  • High torque to weight ratio.
  • Increased reliability.
  • Log battery life.
  • Elimination of ionizing spark from the commutator.
  • Near elimination of electromagnetic interference.
  • Brushless DC motor does not have any carbon brushes, which reduces the frequent replacement requirement of brushes and maintenance costs.
  • Brushless DC motor is available in small compact sizes.
  • Brushless DC motor has low no-load current making it suitable to run it at low or no load.

Disadvantages of brushless DC Motor:

  • The cost of a brushless DC motor is comparatively higher as compared to a brushed DC motor.
  • When the Brushless DC motor is operated at low-speed slight vibrations occur during low-speed rotation. 
  • Brushless DC motor the wiring ad operation of the motor is not that simple due to the involvement of electronic control and its link to all electromagnets.