INDUCTION MOTORS Three-phase induction motors are so common in industry that in many plants no other type of electric machine can be found. The author remem- bers his conversation with a maintenance supervisor in a manufacturing facility who, when asked what types of motors they had on the factory floor, replied: ‘‘Electric motors, of course. What else?’’ As it turned out, all the motors, hundreds of them, were of the induction, squirrel-cage type. This simple and robust machine, an ingenious invention of the late nineteenth century, still maintains its unmatched popularity in industrial practice.
Induction motors employ a simple but clever scheme of electrome- chanical energy conversion. In the squirrel-cage motors, which constitute a vast majority of induction machines, the rotor is inaccessible. No moving contacts, such as the commutator and brushes in dc machines or slip rings and brushes in ac synchronous motors and generators, are needed.
This arrangement greatly increases reliability of induction motors and elimi- nates the danger of sparking, permitting squirrel-cage machines to be safely used in harsh environments, even in an explosive atmosphere. An additional degree of ruggedness is provided by the lack of wiring in the rotor, whose winding consists of uninsulated metal bars forming the ‘‘squirrel cage’’ that gives the name to the motor.
Such a robust rotor can run at high speeds and withstand heavy mechanical and electrical over- loads. In adjustable-speed drives (ASDs), the low electric time constant speeds up the dynamic response to control commands. Typically, induction motors have a significant torque reserve and a low dependence of speed on the load torque.
Preview Ebook Control Of Induction Motors- Andrzej M. Trzynadlowski
Download Ebook Control Of Induction Motors- Andrzej M. Trzynadlowski
Disclaimer!
Engineering Books- Tidak Memperjual Belikan Buku atau apapun itu yang terdapat pada postingan blog ebook.teknikmesin.my.id
Niat dan tujuan ebook.teknikmesin.my.id tidak lain tidak bukan hanya untuk bergbagi informasi. Kami percaya bahwa akses pendidikan berkualitas adalah hak mendasar bagi setiap anak Indonesia.
Jika Anda menemukan tulisan yang persis sama di luar blog ini yang tidak menampilkan kredit saya sebagai penulisnya, mohon berkenan menghubungi saya, Untuk Segera Mungkin Kami TakeDwon karena bagaimana pun tulisan tersebut tetaplah menjadi tanggung jawab ebook.teknikmesin.my.id.