This lesson covers the methods of speed control for DC motors, focusing on two primary methods: varying the armature voltage while keeping the field current constant, and field control. The lesson explains how these methods work, their applications, and their limitations. For instance, varying the armature voltage is suitable for constant load torque drive, while field control is adopted for speeds above the rated speed. The lesson also provides a detailed explanation of how to calculate the new speed of the motor when the field current is changed or when the motor is required to run at a higher speed.

There are two primary methods of speed control for DC motors: varying the armature voltage while keeping the field current constant, and field control.

Varying the armature voltage is suitable for constant load torque drive, while field control is adopted for speeds above the rated speed.

Calculations for the new speed of the motor when the field current is changed or when the motor is required to run at a higher speed can be done using the equations provided in the lesson.

Quick estimation of the new speed can be done by neglecting the armature resistance drop.

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