Brushless DC motors otherwise known as BLDC motors are of the latest motor technology, and different from conventional DC motors as these motors do not contain brushes.

Brushless DC motors are widely used in industrial applications and have various benefits compared to other Electrical Motors.  The controller renders current pulses to the motor winding to control the speed and torque of the motor.

This article will let you know about how brushless DC motors work and why people are using it. So stay tuned until the end of the article.

Related Article- Everything You Need To Know About Motor Controllers

How do Brushless DC Motors Work?

Brushless DC motors are widely used in multi-rotor aircraft because of their speed and effectiveness. Brushless DC motors have the newest technology. Prior you understand how brushless DC motors work, it is necessary to comprehend how brushed motors work. 

Usually, brushed DC motors have permanent magnets on the outside, and there is a spinning armature that comprises an electromagnet inside. Due to the electromagnet, a magnetic field is created in the armature.  When the power is switched on, it helps the armature to rotate. 

The basic working principle of both brushed and brushless motors is the same: internal shaft position feedback. 

The brushless DC motors have two main basic parts called stator and rotor. The rotor has rotor magnets, and the stator is a stationary part that has windings. Whereas the brushed motors have permanent magnets outside, the brushless motors have magnets attached to the rotor and electromagnets to the stator.

The rotor spins 180 degrees when the electric current runs into it. To move further, the electromagnet poles should flip, and the brushes as the rotor spin come in contact with the stator. This helps the magnetic field to flip and allows the rotor to spin in a complete 360 degrees.

What are Brushless DC motors used for?

Brushless DC motors are used widely, where less noise and low heat is required. Devices that work continuously like ACs, washing machines, mixture grinder and other consumer products need Brushless DC motors. Service robots, model engineering, and transport instruments are some of the other areas where brushless DC motors are used for various advantages.

Advantages of Brushless DC motors

Here are some of the advantages Brushless motors have:

• Highly efficient - as the motor is brushless the mechanical energy loss due to friction is less, which enhances the efficiency of the machine.
• Can be operated at high speed for a more extended period of time.
• Dynamic response and long-lasting.
• Less noise and heat required to operate. 
• Speed is high compared to torques.
• No sparking as there are no ionizing sparks from the commutator.
• Due to no brush attached, the motor lasts for a long time, and less maintenance required. 

Disadvantages of Brushless DC motors 

Below are some of the drawbacks of Brushless DC motors:

• Price is high compared to brushed motors.
• If too much heat is provided, then chances are high to damage the winding and weaken the magnet.

Brushless DC motors offer a number of advantages over conventional motors. Hope this article helps you to understand about the brushless dc motor working principle and applications. 

If you Want to develop and integrate a Brushless DC motor controller or drive? Outer Reef Technologies can develop hardware and firmware for your next sensor or sensorless BLDC motor project.