open-circuit and short-circuit test

Equivalent circuit of an Induction Motor Stator’s Equivalent Circuit: The stator model of an induction motor consists of a stator phase winding…

Parallel operations of transformers When we connect the primary windings of two transformers to a common supply voltage and the secondary windings…

Torque-Slip and Torque-Speed Characteristics The Torque-slip curve of an induction motor shows the variation of torque with the slip. We have If…

Types of D.C Machine The magnetic flux in a d.c machine is produced by field coils carrying current. The production of magnetic…

Working Principle of a Single Phase Induction Motor Production of Rotating Field Consider two winding ‘A’ and ‘B’ so displaced that they…

Electromechanical Energy Conversion Principles An electromechanical energy conversion device is the device that converts electrical energy into mechanical energy or, mechanical energy…

Single Phase Transformer The transformer is a static device which converts the magnetic energy into electrical energy. It consists of two or…

Speed Control of D.C. Motors The relationship given below gives the speed of a D.C. motor The above equation shows that the…

No-Load and Blocked Rotor Test The efficiency of small motors can be determined by directly loading them and by measuring the input…

Starting of D.C. Motors A starter is a device that initiates and accelerates the motor. A controller is a device to start,…