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AMIE PART B ELECTRICAL MECHINES STUDY NOTES WARD LEONARD SYSEM

Ward Leonard Control, also known as the Ward Leonard Drive System, was a widely used DC motor speed control system introduced by Harry Ward Leonard in 1891.

In early 1900s, the control system of Ward Leonard was adopted by the U.S. Navy and also used in passenger lift of large mines.

An outstanding contribution to the war effort was the use of Ward-Leonard Control systems in antiaircraft radars.

The Ward Leonard control system was widely used for elevators until thyristor drives became available in the 1980s, because it offered smooth speed control and consistent torque.

A Ward Leonard drive unit consists of a motor and generator with shafts coupled together.

The generator is a DC generator, with field windings and armature windings.

The amplifier output is usually connected to a second motor, which moves the load, such as an elevator.

With this arrangement, small changes in current applied to the input, and thus the generator field, result in large changes in the output, all…

AMIE SUMMER 2012 SEC A DIPLOMA AND NON DIPLOMA QUESTION PAPERS FULL

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