Search Results for: Electrical

Measures for Energy Conservation in Electrical Drives

Measures for Energy Conservation in Electrical Drives: Following Measures for Energy Conservation in Electrical Drives: Use of efficient semiconductor converters. Use of efficient motors. Use of variable speed drives. Energy efficient operation of drives. Improvement of power factor. Using a motor of right rating. Improvement of quality of supply. Use of single- to three-phase semiconductor […]

Measures for Energy Conservation in Electrical Drives Read More »

Classes of Motor Duty in Electrical Drives

Classes of Motor Duty in Electrical Drives: IS: 4722-1968 categorises various load time variations encountered in practice into eight standard Classes of Motor Duty in Electrical Drives: Continuous duty. Short time duty. Intermittent periodic duty. Intermittent periodic duty with starting. Intermittent periodic duty with starting and braking. Continuous duty with intermittent periodic loading. Continuous duty

Classes of Motor Duty in Electrical Drives Read More »

Control of Electrical Drives

Control of Electrical Drives: Closed Loop Speed Control of Multi Motor Drives : When mechanical part of the load is of large physical dimension it becomes desirable to share the load between several motors. For example a rotary printing press usually has several printing stations which are mechanically coupled by a long drive shaft. Control

Control of Electrical Drives Read More »

Current Sensing of Electrical Drives

Current Sensing of Electrical Drives: Current Sensing of Electrical Drives is required for the implementation of current limit control, inner current control loop of closed-loop speed control, closed-loop torque control of a dc drive, for sensing fault conditions, and for sensing speed in dc drives by back emf sensing method. In order to avoid interaction

Current Sensing of Electrical Drives Read More »

Modes of Operation of Electrical Drive

Modes of Operation of Electrical Drive: Three types of Modes of Operation of Electrical Drive: Steady-State Acceleration including starting Deceleration including stopping As we know already, steady-state operation takes place when motor torque equals the load torque. The steady-state operation for a given speed is realized by the adjustment of steady-state motor speed-torque curve such

Modes of Operation of Electrical Drive Read More »

Dynamics of Electrical Drives

Dynamics of Electrical Drives: Classification of Load Torques : As we know already, the nature of Classification of Load Torques depends on particular application. A low speed hoist is an example of a load where the torque is constant and independent of the speed (Fig. 2.3). At low speeds, windage torque is negligible. Therefore, net

Dynamics of Electrical Drives Read More »

Load Equalisation in Electrical Drives

Load Equalisation in Electrical Drives: Load Equalisation in Electrical Drives – In some drive applications, load torque fluctuates widely within short intervals of time. For example, in pressing machines a large torque of short duration is required during pressing operation, otherwise the torque is nearly zero. Other examples are electric hammer, steel rolling mills and

Load Equalisation in Electrical Drives Read More »

Electrical Energy in Power System

Electrical Energy in Power System: Different Types of Energy Sources : Since electrical energy is produced from energy available in various forms in nature, it is desirable to look into Different Types of Energy Sources. These Energy Sources are : The Sun The Wind Water Fuels Nuclear energy Out of these sources, the energy due

Electrical Energy in Power System Read More »

Scroll to Top