There are many types of brushed DC servo motors with core rotors that provide faster acceleration and deceleration due to their low inertia, lightweight cup or disc armatures. For example, the disc armature of a flat-bottomed frame motor, whose center of mass is close to the panel of the motor, is a short, flat cylindrical shiny body, and this configuration allows the motor panel to be installed in a limited space. These motors are useful when brackets are not allowed in industrial robots or other application workspaces, and long motor sizes are not allowed.
The cup armature of a brushed DC motor also has less mass and inertia than a traditional DC servo motor. However, there is a trade-off between the limitations of their duty cycles when using these motors, as the epoxy encapsulated armature is unable to dissipate the heat accumulated in the core armature, which can be damaged if overheated.
However, any brushed motor is not suitable under electromagnetic interference (EMI) due to the effects of some applications, which can generate an arc that can ignite nearby flammable liquids, dust or fumes in the air, and pose a risk of fire or **. The resulting electromagnetic interference can adversely affect nearby electronic circuits. In addition, the brushes of the motor can leave a hard residue that can contaminate nearby sensitive instruments or precise planes, so the brush motor must be continuously cleaned to prevent residue from splashing out of the motor. In addition, brushes must be replaced regularly to avoid unproductive downtime.