International Research Journal of Engineering and Technology (IRJET) Volume: 04 Issue: 04 | Apr -2017
www.irjet.net
e-ISSN: 2395 -0056 p-ISSN: 2395-0072
“Role of Insulation Coating in Electrical Steels and their Final Applications” Mr. Vivek Vijay Mahajan1, Prof. P.N. Gore2 1P.G.
Student, 2Associate Professor. M.E. Mechanical (Product Design and Development), Mechanical Department, D.K.T.E.’s Textile and Engineering Institute, Ichalkaranji, Maharashtra, India. Abstract- Insulation coating is used in the electrical steels in order to reduce the losses occurred in the form of heat loss which is a part of overall core loss. These heating losses can be controlled by applying insulation coating by considering suitability and according to specific requirements. The guidelines for selection of appropriate coating are discussed in this paper.
insulation coating over the surface of electrical steel. This insulation coating is acting as insulator between the laminations and become cause for reducing losses like eddy current loss. II. TYPES OF INSULATION COATINGS AS PER ASTM STANDARD
Keywords: Electrical steel, coating, core loss
[1]As
per ASTM Standard A976 the types of insulation coating for electrical steels are given in table no.1. This classification is mainly according to the chemistry, relative insulation resistance and its functional properties. The purpose of classification is to assist the manufacturers of electrical appliances for providing information related to insulative ability, punchability, temperature sustainability, weldability etc. for each coating type. The table no.1 provides the classification of insulation coating. The coatings are made of organic, inorganic or mixture of both organic and inorganic contents, proportion of which is decided as per required insulation resistivity values of end application requirements. Basically the semi processed steels are processed through bluing process which forms thin layer of oxidized film over the laminations of electrical steel which generally come under C0 type of coating. Other than C0 for cold rolled grain oriented and cold rolled non grain oriented electrical steel the application of coating is varied from C2 to C6 depending upon the insulation resistivity as mentioned earlier in this paper. Insulation coating classification as per ASTM standard A976 is shown in the following table.
I. INTRODUCTION The steel used in the steady and rotating electrical applications in daily life require high efficiency and lower losses. For this, manufacturers use particular type of steel i.e. Electrical Steel. The electrical steel industry mainly manufactures steel for the electrical appliances such as industrial and home appliances. These applications mainly include industrial motors, pump motor, traction motors, hybrid vehicle motors, compressor motors, alternator motors, large capacity generators etc. [1] Along with the rotating applications the stationary applications such as transformers also require electrical steels. These steels are basically classified in two types a. b.
Cold Rolled Grain Oriented Electrical Steel (CRGO) Cold Rolled Non Grain Oriented Electrical Steel (CRNGO) For both the types of electrical steel the main requirement from the applications is a. Lower Hysteresis Loss b. High Insulation Resistance This is the prime requirement of any electrical steel.
[3]The
hysteresis losses are controlled with annealing and steel ingredients such as silicon (Si). The insulation resistance is achieved by applying Table No.1 [1]
© 2017, IRJET
|
Impact Factor value: 5.181
|
ISO 9001:2008 Certified Journal
|
Page 1248