Asenkron motörlerde kafes kırılmasının etkileri
Başlık çevirisi mevcut değil.
- Tez No: 19441
- Danışmanlar: PROF.DR. İLHAMİ ÇETİN
- Tez Türü: Doktora
- Konular: Makine Mühendisliği, Mechanical Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 1992
- Dil: Türkçe
- Üniversite: Marmara Üniversitesi
- Enstitü: Fen Bilimleri Enstitüsü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 289
Özet
Özet yok.
Özet (Çeviri)
Cage induction motors are the most commonly used elec trical machines, they represent a great part o-F the electrical machines produced by the manu-Factur i ng industry all over the world. The main reasons o-F general application are reliability and simple technology. Cage rotors -For high power machines are manufactured with copper rotor bars and end rings, these being brazed or welded together, while machines of lower power are being manufactured with die-casting, technologies. For some years now, it has been a common practice to die-cast the cages. The die-cast rotor has many advantages of simpl icity, ruggedness and durability as well as low cost. One feature of die-casting is the tendency for all castings to have a perfect outside sur face even though the interior may contain voids, blow holes or porosity. Proper die-casting methods assume properly gated moulds, holding proper pressure on the die-casting material and proper heating processes. However, in an induction motor, the die-casting presents a disadvantage as no visual inspection methods will disclose a faulty interior which may affect the electrical performance. Manufacturing die-casted rotors raises several technological problems, as rotors must be. free from im purities. Thus, tests of the rotors of cage induction motors have shown asymmetries in the rotor circuit of these machines, which in case of die-casted rotors are due to technological difficulties. In recent studies three kinds of fault have been identi fied as constituting the bulk of failures to be expected in large induction motors and which occur more often than the next most frequent group. These are, in order of importance, bearing related , is through the impedance of the stator winding and the power lines supplying the induction motor. Since the impedance of the power lines which complete the circuit is usually small com pared to the stator impedance, it can be assumed in most cases that these currents are short-circuited through the stator impedance. It will be seen that the stator currents now consist of the normal mains frequency component, together with a compo nent of
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