DC Machines

DC Machine Applications

DC Machine Applications Whenever the application of any machine is considered, its operating characteristics along with its economic and technical viability as compared to its competitors are the essential criteria. For a DC Machine Applications, of course, the main attraction lies in its flexibility, versatility and ease of control. This explains why in spite of …

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Separately Excited DC Motor for Dynamic Analysis

Separately Excited DC Motor for Dynamic Analysis

Separately Excited DC Motor for Dynamic Analysis: Separately Excited DC Motor for Dynamic Analysis – The DC machines are quite versatile and are capable of giving a variety of V-A and speed-torque characteristics by suitable combinations of various field windings. With solid-state controls their speeds and outputs can be controlled easily over a wide range …

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Braking of DC Motors

Braking of DC Motors

Braking of DC Motors: Controlled slowing or stopping of a motor and its driven load is as important as starting in many applications (e.g. cranes, traction on a slope to avoid excessive speed, etc.). Braking of DC Motors methods based on friction, electromechanical action, eddy-currents, etc. are independent of the motor but sometimes electric braking …

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Rheostatic Control Method

Rheostatic Control Method: Rheostatic Control Method – Series armature-resistance control : Here the applied armature voltage is varied by placing an adjustable resistance Re in series with the armature as shown in Fig. 7.58 along with the speed-torque characteristics. Some of the limitations of the rheostatic control methods are enumerated below: (i) Only speeds below …

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