- There are three types of DC motor:
1. Shunt wound Motor
- Shunt wound
- Series wound
- Compound wound
- Circuit diagram of this type of motor shown in below image.
- In this type of dc motor, Field winding is connected in parallel with armature.
- When voltage across shunt field winding is same as supply voltage, it's resistance is very high. So shunt field winding has many turns of thin wire.
- Here, shunt field winding is connected across the supply voltage, so Ish must be remains constant
- Here,
- Ish = V / Rsh
- IL = Ia + Ish
- Eb = V - Ia Ra
- Pi= V IL
- Pm = Eb Ia
2. Series wound Motor
- Circuit diagram of this type of motor shown in below image.
- In this type of motor field winding is connected in series with armature.
- When field winding is connected in series with armature winding it carries full load armature current.
- It has few turns of thick wire , so it's resistance is very low.
- Here,
- Ia = Ise = IL
- Eb = V - Ia ( Ra + Rse )
- Pi = V IL
- Pm = Eb Ia
3. Compound wound Motor
- This type motor has a both types of field winding, such that shunt field and series field so it's called compound wound Motor.
- According to winding connection it has two types.
- Long Shunt compound motor
- Short Shunt compound motor
1. Long Shunt compound Motor
- Circuit diagram of this type of motor is shown in below image.
- In this type of dc motor shunt field is connected parallel with both series field winding and armature, so it's called long Shunt compound motor.
- Here, series field winding is gives high torque at starting period at heavy load. And shunt field winding gives a constant speed at running time period.
2. Short Shunt compound Motor
- Circuit diagram of this type of motor is shown below image.
- In this type of motor shunt field winding only connected in parallel with armature so it's called short Shunt compound motor.
- It has also both winding series and shunt, so it's gives high starting torque and constant speed.
- In this type of motor shunt field winding only connected in parallel with armature so it's called short Shunt compound motor.
- It has also both winding series and shunt, so it's gives high starting torque and constant speed.
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