BLDC Motors Vs BRUSH DC motors

Understanding the difference


Glossary of terms:

  • Commutator:

Transfers the electric current through the brush assembly to the armature.

  • Brushes:

Ride on the commutator and sends electric current to the armature.

  • Armature:

The rotating part of a brush DC motor that contains the wire windings.

Brushed Motors have been the most used DC technology over last 100 years.


Glossary of terms:

  • Stator:

The outer, non-rotating structure that contains the windings

  • Rotor:

The rotating part of a brushless DC motor which contains fixed magnets

The DC motor was invented in 1880 by Werner von Siemens

From 2003 to 2010, the brushless Dc motor market grew from $300million to over $1.3billion, partly due to the rise in technologies that use the motors such as robotics and packaging


Brushless DC (BLDC)Motors Brush DC Motors
Use an Electronic System to control current Need a mechanical system to control current
Convert electrical power into mechanical power more efficiently Simple design/simple construction
Less friction = Less heat loss Simple design = Easy control
No rubbing or wearing parts = Longer life Brushes wear out creating noise
Greater mean time between maintenance Shorter mean time between failures
Higher torque-to-size ratio  

Brushless And Brush Motors functionally are explained by Faraday’s law of induction (1831).  This predicts how magnetic fields react to electronic current.

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