Electrical Machines

Inverted Induction Motor

Inverted Induction Machine

Inverted Induction Motor: In a wound rotor induction machine the three-phase supply can be given to the rotor windings through the slip rings and the stator terminals can be shorted (see Fig. 9.68). Such a Rotor Fed Induction Machine is also called an Inverted Induction Motor. The three-phase rotor current will generate a rotating field […]

Inverted Induction Motor Read More »

Dynamic Modelling of Induction Motor

Dynamic Modelling of Induction Motor: In general, the mechanical time-constant for any machine is much larger than the electrical time constant. Therefore, the Dynamic Modelling of Induction Motor can be simplified by neglecting the electrical transient without any loss of accuracy of results. The circuit model of Induction motor holds for constant slip but would

Dynamic Modelling of Induction Motor Read More »

Isolated Induction Generator

Isolated Induction Generator: An Induction Machine can also work as a generator even if external power supply not available and it is called Isolated Induction Generator. An Isolated Induction Generator feeding a load is shown in Fig. 9.61. The delta-connected capacitors across the generator terminals provide the magnetizing current necessary to excite the isolated generator.

Isolated Induction Generator Read More »

Double Cage Rotor Induction Motor

Double Cage Rotor Induction Motor

Double Cage Rotor Induction Motor: A rotor design, which though more expensive gives still better starting, and running performances than the deep-bar design, is the Double Cage Rotor Induction Motor. The double squirrel cage induction motor winding in this design consists of two layers of bars short-circuited by end rings. The upper bars have a

Double Cage Rotor Induction Motor Read More »

Deep Bar Rotor Induction Motor

Deep Bar Rotor Induction Motor

Deep Bar Rotor Induction Motor: In this type of Deep Bar Rotor Induction Motor construction, bars of narrow width are laid down in deep semi-enclosed  slots as shown in Fig. 9.52. The magnetic leakage flux pattern set up by the bar current is indicated in dotted lines in the figure. The rotor bar can be

Deep Bar Rotor Induction Motor Read More »

Speed Control of Induction Motor

Speed Control of Induction Motor: Stepless control of speed of induction motors cannot be carried out as efficiently and inexpensively as for dc motors. Various methods of Speed Control of Induction Motor can be visualized by consideration of the speed equation It is seen from this equation that there are two basic methods of speed

Speed Control of Induction Motor Read More »

Starting Methods of Induction Motor

Starting Methods of Induction Motor: Starting Methods of Induction Motor – At the time of starting the motor slip being unity, the load resistance with reference to the approximate circuit model of Fig. 9.23 is meaning thereby that short-circuit conditions prevail. Therefore, the motor current at starting can be as large as five to six

Starting Methods of Induction Motor Read More »

Scroll to Top