We are now here talking about Types of DC Motor and for what purpose it is used. One of them is Brush Motor. The newest buzz in the power tool community is brushless motors. Tool users from every trade are wondering how these motors are different. If they really perform better, and if they’re really worth all the hype. At this stage in the game, the answers to these questions are surprisingly positive. Excluding the higher price tag for power tools with brushless motors. The pros and cons list is decidedly imbalanced in favor, of course, of this brushless innovation. In other words, our expectations of these tools are high and our forecast for their future performance is definitely optimistic.
Construction: How is the Brushless DC Motor Different?
Brush Motor
As you know, a standard DC brush motor operates with a fairly simple construction. Consisting basically of an armature, the commutator, carbon brushes and a field. The brushed motor in your power tool relies entirely on carbon brushes to transfer electricity from power source to motor.
In a nutshell, the armature is a series of electromagnets on a free-spinning shaft. The commutator is connect to the armature by that shaft and acts as a switch to the electromagnet. The brushes are conductive carbon blocks and the field is a ring compose of a series of magnets (magnetic field). The brushes press against the commutator from opposite poles of the power source transferring electricity into the commutator. These charges change the polarity of the electromagnet. Constant switch between poles in electromagnet alternately pushes and pulls against the conventional magnets in the field to create rotation. And thus, a spinning armature and a functioning motor. The spinning of the Types of DC Motor, though, naturally creates friction against the carbon brushes. This both depletes the brushes promising you’ll eventually need to replace them, and also wastes energy within the motor.
Brushless Motors:
Brushless motors, on another hand, use a circuit board instead of the carbon brushes and commutator. Conventional magnets surround the shaft and a ring of electromagnets surrounds that magnetic field. The electromagnets are stationary allowing the shaft and magnetic field to spin freely within the electromagnet ring. And because these electromagnets don’t spin, electricity can deliver to them directly. In lieu of the brushes and commutator, the control circuitry now alternates the polarity of the electromagnets.
In other words, a brushless motor doesn’t need brushes because it’s magnets are position differently. And because electricity is deliver to the electromagnets directly. Barring unforeseen issues with the circuit board, the brushless motor is super clean and super-efficient.
Ultimately, the hype is appropriate and brushless motor technology is a really exciting step in the evolution of power tools. Whether you choose to lay down a few extra dollars for this new breed of tool is between you and your work-load. But, in either case, I hope you’ll share with me some pride in our power tool community that continues to grow and improve and enhance our ability to do what we do.