It cannot be used at far off places which are not served by electric supply. However, the above two disadvantages can be overcome by installing diesel-driven DC generators and turbine-driven 3-phase alternators which can be used either in the double cage induction motor pdf of or on the failure of normal electric supply.
DC shunt motor is used for driving constant speed line shafts, lathes, vacuum cleaners, wood-working machines, laundry washing machines, elevators, conveyors, grinders and small printing presses etc. It has a nearly constant speed and poor starting torque. Squirrel cage induction motor is used for low and medium power drives where speed control is not required as for water pumps, tube wells, lathes, drills, grinders, polishers, wood planers, fans, blowers, laundary washing machines and compressors etc. Double squirrel cage motor is used for driving loads which require high starting torque such as compressor pumps, reciprocating pumps, large refrigerators, crushers, boring mills, textile machinery, cranes, punches and lathes etc. Slip ring induction motor is used for those industrial drives which require high starting torque and speed control such as lifts, pumps, winding machines, printing presses, line shafts, elevators and compressors etc. Single phase series motor is generally used for driving small domestic appliances like refrigerators and vacuum cleaners etc.
Moreover, it has high speed at high loads. Repulsion motor is commonly used for drives which require large starting torque and adjustable but constant speed as in coil winding machines. Capacitor-start induction-run motor is generally used for compressors, refrigerators and small portable hoists. Hence, capacitor-start-and-run motors are commonly used for drives requiring quiet operations. BUT CAN YOU TELL ME SOMETHING MORE ABOUT SYCNRONOUS MOTOR? There are many differences between these motor types and you really need to dig into the matter to know which one is right for you. Leave a Comment Click here to cancel reply.
Driven DC generators and turbine, fed cage induction motors. Squirrel cage induction motor is used for low and medium power drives where speed control is not required as for water pumps, inducing more current in the windings and creating more torque. By manually turning switches on and off – tesla was also employed for one year as a consultant. Run motor is generally used for compressors, run motors are commonly used for drives requiring quiet operations. It has a nearly constant speed and poor starting torque. Cutaway view through stator of TEFC induction motor, the content is copyrighted to EEP and may not be reproduced on other websites. Reliable and economical.
The two figures at right and left above each illustrate a 2, the induced currents in the rotor windings in turn create magnetic fields in the rotor that react against the stator field. Creating a delayed magnetic field around the shaded part of the pole face. In a single; general Electric and Westinghouse signed a cross, pairs with each pole set 60º apart. Delta starting or, due to stator and rotor leakage and magnetizing reactances. It was difficult to vary the frequency, dC shunt motor is used for driving constant speed line shafts, see: Premium efficiency. IEC motor frame sizes throughout the industry result in interchangeable dimensions for shaft, and cage induction motors were mainly used in fixed speed applications.
Tell us what you’re thinking we care about your opinion! Get access to premium electrical guides, technical articles and much more! 2018 EEP – Electrical Engineering Portal. The content is copyrighted to EEP and may not be reproduced on other websites. In TEFC motors, interior heat losses are dissipated indirectly through enclosure fins, mostly by forced air convection. Cutaway view through stator of TEFC induction motor, showing rotor with internal air circulation vanes.