Brushed DC Motor Basics VIII

  As we compare the performance characteristics of all four types of brushed DC motors we see that they all show the same basic characteristic, as speed increases torque decreases. For a permanent magnet brushed DC motor this is a very linear process. With the shunt wound brushed DC motor you can see that there is a high but more consistent torque at low speeds which gives it excellent speed control characteristics. The series wound brushed DC motor graph shows its great low speed torque and a very drastic decrease in torque with higher speed, thus if the load was removed, speed would increase very sharply. Finally, with a compound wound brushed DC motor we see a great combination of both the shunt and series wound brushed DC motors. The graph shows good low speed torque but with a more linear or gradual decrease of torque as speed increases, thus showing that it is well suited for lifting heavy loads with great speed control.

Brushed DC Motor Type Comparison

  Here is a table summarizing the various aspects of each motor type that may make
it easier for you to decide which motor suits your application needs.