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Brushless Technology

May 3, 2012

 

How a Brushless Motor Works

A brushless motor, notice the orange magnets that are stationed around.

Brushless motor technology has been around since 1810, but wasn’t really put into use until the 1960’s. So, what is a brushless motor? It is simply a motor without the brushes. Typical motors have brushes that are in continual physical contact and cause frictional energy losses. In a brushless motor the armature electromagnetic coils are in fixed positions around the permanent magnets and these magnets are located on or around the brushless motor. The brushless technology uses a computer  in its motor, it relates to the electronic control of the magnets and tells the motor when to  switch on the phase of current, which then flows through the armature windings. Then and at the exact right moment, it  will begin the rotational response.

The Advantages of a Brushless Motor

The pluses to a brushless motor are Seven fold:

First, the motor is supremely efficient and has a much longer motor life versus motors that run on brush technology. Secondly, as there are no longer brushes involved with this technology and thus there is a lack of brushes to wear out and replace, brushless motors require less maintenance. Third, the lack of brushes also eliminates the problems associated with sparking or noise. Fourth, there is the given option of more electromagnets on the stator, this will offer the user more accurate control of the machine. Fifth, the magnets on the stator are easily cooled and do not require air flow inside the motor, this makes it possible to completely close off the motor and keep it safe from debris and dust. Sixth, with a brushless motor you receive greater power, with the addition of more torque per weight and more torque per watt. In addition to the previously mentioned benefits, there is an overall lack of heat and a longer run time, lending your machine an endurance boost while it is in use. Seventh, the brushless motor delivers an overall flatter torque, as well as a physically lighter frame making it much more compact than the traditional motor.

Source:

http://www.milwaukeetool.com/fuel/features/index.html

Picture Source:

http://www.jahidbhadrak.in/products/brushless-dc-motor/

 

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