Brushless DC Motors

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Traditionally, many motor needs have been met using brushed DC motors. These motors use the brushes to move the commutator, which creates the rotational torque needed for it to work. In a motor that is brushless, the commutation is done electronically. There is no need for brushes, as the torque is a function of the electronic action of the brushless motor on the commutator.

Why Use a Brushless Motor?

What this means is that a brushless motor has fewer parts that can wear out and need to be replaced. With a brushless DC motor, also called a BLDC motor, there is never any need to be concerned about the condition of the brushes, which could require that the motor be taken out of service and restored. Brushless motors can be just as effective for high –speed operation as a brushed motor, if not more, but because there are no brushes to replace, a brushless can have a life expectancy in excess of 10,000 hours.

For a project where a motor is only going to be used for a short time, a brushed DC motor may be sufficient and cost effective. But if it is going to be in continuous use, especially if it’s going to be required to take on a lot of power, a brushless motor is a much better choice. The amount of money a company can save by having to replace or repair its motors less often far outweighs the difference in cost between brush DC motors and brushless DC motors, even considering the cost to own and maintain a motor controller, which is required to direct power to the brushless motor, a requirement that the brush DC motor doesn’t have. Other benefits to the brushless motor include quieter running, no sparks from friction against a commutator and less electromagnetic interference.

Brushless motors can be used in a wide variety of applications. Low power brushless motors can be used to power turntables or radio controlled model airplanes, while high power brushless motors can be used for electric vehicles and industrial machinery. Other common applications for these motors include computer parts such as CD-ROM players and PC cooling fans. If you are already using a brush motor for a given application, you can usually easily replace it with a brushless motor, providing you use the same wattage and size as your original motor. Use the convenient search bar provided to find exactly the brushless DC motor you need.

How Do I Choose a Brushless Motor?

Brushless DC motors provide high power density and long life for applications requiring speed control. NMB’s BLDC motors are available in 0.1W up to 1kW.

To find one you need to just select the proper size and maximum watts output from the Motor Search above, and then add the required continuous stall torque and no load speed to get a list of brushless DC motors that meet your parameters.

Brushless DC Motors Engineering

  1. BLDC Motor – Brushless DC Motor Introduction

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History of Brushless DC Motors