Speed Control of DC motors (DC Drives). Dynamics of Motor Load Systems J moment of inertia kg-m2 instantaneous angular velocity rad/sec T developed torque.

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Presentation transcript:

Speed Control of DC motors (DC Drives)

Dynamics of Motor Load Systems J moment of inertia kg-m2 instantaneous angular velocity rad/sec T developed torque of the motor N.m. The load torque. Viscous Friction torque. B Viscous Friction coefficient.

Steady State Stability

Four-quadrant operation.

DC Motors

Steady State Speed Torque Relations

Separately Excited DC Motor

Series DC Motor

Methods of Speed Control Armature Voltage Control Field Flux Control Armature Resistance Control

Armature Voltage Control 1.Controlled Rectfier 2. Chopper (DC-DC Converter) Field Flux Control

Separately Series

Torque & Power Limitations in Combined armature Voltage and Field Control

b.

Armature Resistance Control Separately or shunt field

Armature Resistance Control Series field

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