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Starting of DC Motors

Starting of DC Motors: At the time of Starting of DC Motors (n = 0), the induced emf of a motor is zero such that the current drawn from rated…

Characteristics of DC Motors

Characteristics of DC Motors | Characteristics of Shunt Motor: The power of the dc motor lies in its versatility and ease with which a variety of speed-torque characteristics can be…

Characteristics of Separately Excited DC Generator

Characteristics of Separately Excited DC Generator: With the advent of silicon-controlled rectifiers, the importance of the dc machine as a generator has considerably reduced as SCRs can be employed to…

Methods of Excitation of DC Generator

Methods of Excitation of DC Generator: The performance characteristics of a dc machine are greatly influenced by the way in which the field winding is excited with direct current. There…

Electric Motor Characteristics

Electric Motor Characteristics: The machine and the load are the two components of an electro-mechanical energy-conversion system, and the Electric Motor Characteristics, generally, play a predominant part in the operating…

2 Pole Elementary DC Machine

2 Pole Elementary DC Machine: Figure 5.13 shows a 2 Pole Elementary DC Machine with a single coil rotating armature. It may be seen that the field winding is stationary…

Rotating Electrical Machines

Rotating Electrical Machines: We Know that electromechanical energy conversion takes place whenever a change in flux is associated with mechanical motion. Speed voltage is generated in a coil when there…

Field Energy and Mechanical Force

Field Energy and Mechanical Force: Field Energy and Mechanical Force - Consider once again the attracted armature relay excited by an electric source as in Fig. 4.4. The field produces…