What is Ward Leonard Method of Speed Control?

Encyclopedia
08/14/2024

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.

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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.

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