Ward Leonard method of speed control is used for controlling the speed of a DC motor.
Speed control of D.C. motor can be obtained by varying the applied voltage to the armature. Ward Leonard system of speed control is based on this principle.
In this method M is the main D.C. motor whose speed is to be controlled, and G is a separately excited D.C generator. The generator G is driven by a 3 phase induction motor
The combination of ac driving motor and the dc generator is called the motor generator set.
The output voltage of dc generator is control by varying the excitation. The output voltage is then fed to dc motor to control the speed.
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