Comparison Of A Brushed Motor and a Brushless DC Motor

The brushless DC motor has been in commercial application since 1886. Other names for a brushless motor are electronically commutated motors or stepping motors. The application of this motor is done for the development in science and technology. However, before understanding its working, let’s look at the features and framework of a brushed motor, from where the need of brushless DC motor surfaced. Based on a traditional DC motor framework, a brushed motor has permanent magnets on the outside and spinning armature towards the interiors.

The stationary magnets on the sides are also called the stator. The interior framework can comfortably rotate; therefore, it is termed as rotor. The armature contains electromagnetic compounds, through which electricity is passed, therefore creating a magnetic field, which draw and shoves magnetic in the stator. Therefore, the internal framework spins at 180 degrees. For the armature to keep spinning, polarity needs to keep changing. The brushes are responsible for changing the poles of the electromagnet.

Although the brushed motor framework is simple and cheap, there are a number of setbacks of this system. The most evident one is fraying of the brush. In addition, when the brushes are frayed, these are constantly making and breaking connection, which lead to electrical noise. Frayed brushes limit the speed of the motors as well. In addition, electromagnet being integral to the framework, it is hard to keep it cool. Furthermore, the brush-based motor limits the number of poles the armature can have at a time.

All the limitations of a brushed motor lead to the advent of brushless DC motor. The concept of this motor was derived by the objective of eliminating the brushes, by turning the motor inside out. By putting the permanent magnets on the rotor and shifting the electromagnet to the stator, you can create your very own brushless motor. With the use of computer connected with high-voltage transistors, you can power up the electromagnets. The upgrade from brushed to brushless has been gradual, making the new framework more precise, reliable and durable.

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