- Flux Control Method
- Armature Control Method
- Voltage Control Method
- Multiple Voltage Control
- Ward Leonard System
Flux Control Method
Armature control method
A variable resistance Rc ( controller resistance ) is placed in series with the armature as shown in figure.
Voltage control method
This method is used for large size motors since it is very expensive.
Multiple voltage control
In this method, the shunt field of the motor is connected permanently across a-fixed voltage source.
Ward Leonard system
The armature of the shunt motor M (whose speed is to be controlled) is connected directly to a d.c. generator G driven by a constant-speed a.c. motor A.
Sometimes, a field regulator is included in the field circuit of shunt motor M for additional speed adjustment. With this method, the motor may be operated at any speed upto its maximum speed.