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You have many choices available when it comes to picking the right DC motor technology depending on your application. Most of the time, we never understand that which motor is suitable for the application acoording with Speed, torque, cost and many more. In this blog, we are discussing about the difference between Brushed DC motor and Brushless DC motor which helps you to choose exact motor for your applications.
What is a Brushed DC Motor?
Brushed DC motors are one of the simplest types of DC motor. It typically consists of a pair of permanent magnets named as the stator and a motor coil named as the rotor connected to a commutator. In this motor, armature winding is on rotar and permanent magnets are always on the stator. The current-carrying conductors always locates on the turning part. practically, these conductors get power from direct current power source. It uses metallic brushes (which rotate along with the rotor) to transfer the current to the coil. Though these motors are quite efficient but they require periodic maintenance of brushes.
Brushed motors use mechanical commutation of the windings via brushes instead of a controller to switch current in the windings. The brushes charge the commutator inversely in polarity to the fixed magnet, causing the armature to rotate. When these windings get energized, they produce a magnetic field whose attraction and repulsion keeps the rotor turning. As the rotor turns, the windings are constantly being energized in a different sequence so as to keep the rotor rotating within the stator filed.
Brushes presents inside the electric motors use to deliver current to the motor windings through commutator contacts.
What is a Brushless DC Motor?
As their name implies, Brushless DC motors do not use brushes. Brushless DC motors do not make use of commutation to regulate the current flow inside the coils. It uses Electrical commutation to deliver the current which produces an AC electric signal causing the motor to drive.
In this motor, the permanent magnets attach to the rotor. And the current-carrying conductors or armature windings are located on the stator. Unlike brushed motors, they use electrical commutation to convert electrical energy into mechanical energy.
Brushless motor not have current carrying commutators. The field inside a brushless motor is switched via an amplifier triggered by commutating device, such as an optical encoder.
MUST READ BLOG POSTS ON DC MOTORS:
- Working Principle of DC Motor
- What is Brushed DC motor
- What is Brushless DC motor
- Difference Between AC and DC Motor
- Different Types of DC Motor
- Applications of Dc motor
- Speed control of DC motor
Difference between Brushed DC Motor and Brushless DC Motor
Parameters |
Brushed DC motor |
Brushless DC motor |
|
Commutation |
It uses brushes to deliver current to the motor windings through mechanical commutation |
It uses Electrical commutation to deliver the current. |
|
Speed range |
Lower compared to BLDC |
High- because of the absense of brushes and commutator |
|
Control |
Simple |
Complex and expensive |
|
Electrical noise |
Arcs in the brushes generate noise |
Low |
|
Rotor inertia |
Higher rotor inertia which limits dynamic characterstics |
Low, because it has permnent magnets on rotar. it increses dynamic response |
|
Maintanence |
Periodic maintenance required |
Less required in absence of brushes |
|
speed/torque characterstics |
Low-mechnical limitation by brushes |
Higher-no mechanical limitations |
|
Effieciency |
Moderate |
High |
|
Life |
Short |
Long |
|
Building cost |
Lower compare to BLDC |
Higher- since it has permanent magnets |
|
Control requirment |
No controller is required |
Controller is always required to keep motor running |
|
Construction |
Armature winding is on rotar; Fixed magnets are placed on either side of the rotating electromagnet |
Armature winding is on stator and fixed magnets are on rotar |
|
Applications |
Home appliances, kid toys, in industrial applications, medical equipments, robots and drones to electric cars, power tools etc |
Electric vehicles, hybrid vehicles, and electric bicycles, Industrial applicarions, drones, washing machines, Fans, pumps and blowers etc |
Hope this article helps you to understand the difference between brushed dc motor and brushless Dc motor. Although, both brushed and brushless DC motors are essentially the same. Only there are few points to be diferent.
We at Robu.in hope that you found it interesting and that you will come back for more of our educational blogs.
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Thursday, March 27, 2025