The magnetic field created by the armature winding attracts and repels it. It forces the winding to spin in a 180° fashion. Nevertheless, in order to keep it rotating, the poles of the permanent magnet have to be switched. This job is done by brushes and that is why a DC motor manufacturer has to produce a brush DC motor.
Although the brushes are capable of changing the polarity well, they have certain major disadvantages. For instance, after several uses, the brushes would wear out leading to imperfect polarity. Because of them, the motor is also noisy and lastly, the brushes do not let the motor work to its full capacity. All these disadvantages led to the production of brushless DC motors.
As the name suggests, a Brushless DC motor manufacturer does not use brushes. Instead, a computer connected with transistors will be used to charge the permanent magnet as the winding rotates. In this way, a Brushless DC motor manufacturer is capable of making not only long lasting but also more efficient motors because the use of computer guarantees immense precision. Contact a Brushless motor manufacturer and enquire about such a motor. It is normal for a Brushless motor manufacturer to ask for a higher price for these motors because of their high development cost. When you pay the price, be assured that the DC motor would not require a replacement for a long time now.