Electric Motor Resource Center

What Are Brushless Dc Motors?


Brushless DC motors are motion control devices that run on direct current and convert that electrical energy into mechanical power or torque. Brushless DC motors, sometimes called BLDC motors, lack the conducive brush and springs that carry the electrical current. Instead, brushless DC motors will use permanent magnets within the rotor. 
 

The absence of a brush means that BLDC motors can provide a unique set of advantages and will be useful for many different types of equipment and systems. They are now quite commonly used as an alternative to brushed DC motors, although brushed DC motors are still used, primarily because of their economy.   

How Do Brushless Dc Motors Work?

Brushless DC motors create mechanical energy as direct current is fed to the stator. The electromagnets on this component are charged. The permanent magnets of the rotor interact with these elements and the rotor spins a complete rotation. The electrical current that initiates this action is controlled by a current that is regulated via a microprocessor or similar component, allowing for precise operation.

What Are The Advantages Of Brushless Dc Motors?

Brushless DC motors offer many advantages. Compared to DC motors that use a brush to generate mechanical energy, they are more efficient and do not need to be repaired or updated as frequently. This is because there is no brush to wear down over time. In addition to an extended operational life, BLDC motors do not spark and will run smoother, quieter, and cooler than brushed motors. They are also more compact and can be controlled with greater precision.

While they are more expensive to manufacture and therefore require a higher price on initial purchase, they save costs with reduced maintenance and improved efficiency. Brushless DC motors can also offer better performance when continuous operation is required.  

What Are Brushless Dc Motors Used For?

Brushless DC motors are used in a wide range of systems and equipment because of their operational and performance capabilities. They can be precisely controlled and will perform reliably in devices that must operate continuously. OEMs will often incorporate brushless DC motors into consumer electronics and appliances, including washing machines and dryers, air conditioners, DVD players, and more. 

Brushless DC motors are also used in more advanced and high-demand applications, including various industrial and manufacturing capacities, as well as in aerospace, marine, and defense equipment. 

With an increasing number of robotic and automated systems used across many industries, BLDC motors are essential in much of this equipment.     

Where Can I Get Custom Brushless Dc Motors?

These electric motors can be sourced as standard, commercial products from various electric motor suppliers. They can also be purchased directly from larger manufacturers, but such providers will usually only fulfill bulk and large quantity orders to meet with the needs of OEMs.

Custom BLDC motors or special devices made for prototyping purposes can be sourced from smaller electric motor manufacturers. Motor manufacturers can also provide frameless brushless motors and motors with special housing in order to meet with the requirements of a unique piece of equipment or mechanical system.

What Is A Brushless Dc Motor Controller?

A brushless DC motor controller is a device that controls the motor’s operation. This can be accomplished with a variety of devices. Motor manufacturers may create motor controllers that are built to the specific performance parameters of an individual motor.

Sensorless BLDC motor control is also used to determine the position of the rotor and modulate operation as a result. This is accomplished through electromagnetic force, which is controlled via micro-controller, digital signal processor, or a similar component.