DC motors can be classified into various types based on different criteria. are some common classifications of DC motors:

1. Based on Excitation:

   • Separately Excited DC Motor: The field winding supplied by an independent source.
   • Shunt Wound DC Motor The field winding is connected in parallel with the armature winding.
   • Series Wound DC Motor: The field winding is connected in series with the armature winding.
   • Compound Wound DC Motor: The motor has both series and shunt field wind.

2. Based on Construction:

   • Permanent Magnet DC Motor: Utilizes permanent magnets to create the magnetic field.
   • Wound Field DC Motor: Uses electromets for the field winding.

3. Based on Speed Control:

   • Constant Speed DC: Operates at a fixed speed.
   • Variable Speed DC: Speed can be varied using methods such as armature voltage control, field flux control, or electronic control.

4. Based on Application:

   • Industrial DC Motors: Designed for heavy-duty industrial applications.
   • Small DC Motors: Used in applications such as toys, small appliances, and tools.

These are some of the common classifications of DC motors, each with its own advantages and applications.