A smooth variation of speed from zero to above normal with inherent stability of speed at all loads is achieved through an adjustable voltage system of speed control called Ward-Leonard Method of speed control. Fig. 1: Ward Leonard Method of Speed Control.
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The AC series motor is designed to work on AC and DC both. The stator is made of laminations of silicon steel to reduce the hysteresis and eddy current losses. The armature of the universal motor is the same as that of the ordinary series motor. Figure 1: AC Series Motor.
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Transformer, being a stationary electrical equipment, does not have rotational or windage losses. The losses which occur in a transformer are, Copper losses Iron or core losses.
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Split Phase Induction Motor is a type of A.C. single phase motor. It has two windings placed at 90° to each other. These are starting winding and main windings. The main winding has low resistance and high inductance. It is wound with thick conductor having less number of turns then the starting winding. It is
What is Split Phase Induction Motor? Working, Diagram & Characteristics Read More »
Braking is the method of stopping the motor whenever it is needed. A three-phase induction motor can be braked by disconnecting the stator windings from the supply and feeding two stator phases with DC. A three phase slip-ring motor can also be braked by opening one supply lead to the motor and connecting a suitable
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The Star Delta Starter used to starting the standard squirrel cage induction motors with both ends of each of the three windings brought out (six terminals) are known as star-delta motors. The Star Delta Starter connects the three stator windings in star across the rated supply voltage at the time of starting. After the motor
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Different DC motors are used in industry for various applications. Which type of motor will suit a particular load depends on the requirements of the load and characteristics exhibited by the motor. Applications of different motors are as under: DC Shunt Motor Applications Fig. 1: DC Shunt Motor Torque speed characteristics.
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The potential transformer is another type of instrumentation transformer. It is used to measure high ac voltages. The construction of a Potential Transformer (P.T.) is same as that of the normal transformer. Fig. 1 : Connection of Potential Transformer (PT) to measure voltage.
What is a Potential Transformer (PT)? Working Principle, Diagram, & Disadvantage Read More »
A two point starter (or 2 Point Starter) is used for starting of a DC series motor. Fig. 1: 2 Point Starter
What is a 2 Point Starter? Working Principle, Construction, Diagram & Disadvantage Read More »
DC Motor Starter is an additional external device which is required to be connected along with a dc motor, in order to start the motor in a safe manner. That means starting a dc motor without a starter is not safe for the motor. So we should understand the need of starter (Fig. 1). Fig.
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