Differentiate the application of shunt motor from compound motor?

Shunt Motor:
1. Shunt motors have a field winding connected in parallel with the armature winding.
2. Shunt motors have a constant speed characteristic, making them suitable for applications where a constant speed is required.
3. Shunt motors are used in applications where a constant speed is needed, such as in fans, blowers, and conveyors.
4. Shunt motors have a simple construction and are easy to control.

Compound Motor:
1. Compound motors have both series and shunt field windings connected to the armature winding.
2. Compound motors have a variable speed characteristic, making them suitable for applications where variable speed is required.
3. Compound motors are used in applications where variable speed is needed, such as in cranes, elevators, and hoists.
4. Compound motors have a more complex construction compared to shunt motors and require more sophisticated control systems.

Shunt Motor

- Applications:
- Constant speed applications requiring a wide speed range
- Fans, blowers, pumps, machine tools
- Hoists, elevators, conveyors
- Advantages:
- High starting torque (as the field winding is connected in parallel to the armature winding)
- Constant speed over a wide range of loads
- Stable speed under varying load conditions
- Disadvantages:
- High starting current
- Lower efficiency compared to compound motors

Compound Motor

- Applications:
- Applications requiring both high starting torque and variable speed
- Cranes, electric locomotives, mining equipment
- Rolling mills, printing presses
- Advantages:
- High starting torque due to the presence of series field winding
- Variable speed control can be achieved by adjusting the field current
- Improved efficiency compared to shunt motors
- Disadvantages:
- Speed regulation is not as good as shunt motors
- Can be unstable under certain load conditions

Key Differences in Application:

- Constant speed applications: Shunt motors are preferred due to their stable speed and good speed regulation.
- High starting torque applications: Compound motors are better suited for applications requiring high starting torque, such as cranes and locomotives.
- Variable speed applications: Compound motors allow for speed control by adjusting the field current, making them suitable for applications where speed variation is required.
- Efficiency: Compound motors have higher efficiency than shunt motors, especially under high load conditions.