High Efficiency Induction Motors

High Efficiency Induction Motors: With ever-increasing energy cost the life-time operating cost of an induction motor can be traded against a high efficiency and high capital cost induction motors. With rising demand for high efficiency or energy efficient induction motors, designers and manufacturers are stepping up their production of such motors. Some of the important […]

Isolated Induction Generator Working Principle

Isolated Induction Generator Working Principle: An Isolated Induction Generator Working Principle 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. The voltage build-up will be explained later in this section. As the generator is loaded, the operating frequency depends […]

Classes of Squirrel cage motors

Classes of Squirrel cage motors: Classes of Squirrel cage motors – To cater to the different starting and running requirements of a various industrial applications, several standard designs of squirrel-cage motors are available in the market. The torque-speed characteristics of the most common designs are shown in Fig. 9.58. The effective resistance of the rotor […]

Double Cage Rotor

Double Cage Rotor: Double Cage Rotor – A rotor design, which though more expensive gives still better starting, and running performances than the deep-bar design, is the double-cage rotor. The squirrel-cage winding in this design consists of two layers of bars short-circuited by end rings. The upper bars have a smaller cross-sectional area than the […]