What is Ward Leonard Method of Speed Control?

What is Ward Leonard Method of Speed Control?

Vaud Leonard method definition

The Vaud Leonard method is defined as a speed control system using a DC motor with a variable voltage provided by an electric generator set.

Principles of the Vaud Leonard method

The system involves a DC motor (M1) that is driven by another motor (G) that is driven by another motor (M2) that controls the speed by adjusting the output voltage of the generator.

Advantage

• It is a very smooth speed control system over a very wide range (from zero to the normal speed of the motor).

• The speed can be easily controlled in the direction of rotation of the motor.

• The motor can run at a uniform acceleration.

• In this Vaud Leonard system, the speed regulation of the DC motor is very good.

• It has inherent regenerative braking properties.

Shortcoming

• The system is very expensive because it requires two additional machines (electric generator sets).

• The overall efficiency of the system is not enough, especially under light loads.

• Greater size and weight. More floor space is needed.

• Regular maintenance.

• The drive makes more noise.

Apply

The Ward Leonard method is used in applications that require precise and sensitive speed control, such as cranes, elevators, steel mills and locomotives.