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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…

Electrical Braking of Polyphase Induction Motors

Electrical Braking of Polyphase Induction Motors: Electrical Braking of Polyphase Induction Motors which consists of different types, namely, Plugging (or Counter-Current Braking) Dynamic (or Rheostatic) Braking Regenerative Braking 1. Plugging…

Drum Controller for DC Series Motor

Drum Controller for DC Series Motor: DC series motors are often employed on cranes, elevators, tramcars and other applications, where the motor is under the direct control of an operator.…

Electric Braking of Separately Excited DC Motor

Electric Braking of Separately Excited DC Motor: The electric braking of separately excited dc motor is show in Figure 3.31. Figure 3.31 (a) illustrates a simplified representation of a single…

Thyristorised Control of DC Electric Traction Motor

Thyristorised Control of DC Electric Traction Motor: The modern trend is towards the use of dc motors (both separately excited and dc series motors) equipped with thyristor chopper control. The…

Important Questions of Characteristics of Electric Motors

Important Questions of Characteristics of Electric Motors: Problems of Characteristics of Electric Motors: 1.A 50 hp, 220 V, 1200 rpm dc shunt motor has an efficiency of 85% at full…

DC Motor Drives Articles

DC Motor Drives Articles: Types of DC Motor: The commonly used Types of DC Motor are shown in Fig. 5.1. In a separately excited motor, the field and armature voltages…

Polyphase AC Motors for Traction Drives

Polyphase AC Motors for Traction Drives: Polyphase AC Motors for Traction Drives - Advantages of ac motors over dc we already know. Because of negligible maintenance, ruggedness and higher power…

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