Kindly provide a pdf copy of Electrical Machine design by A. Nagoor kani

Regards,
Jayasri

Introduction of Electric Machine Design:
Electrical materials used in the construction of all commercial machines may be broadly classified into three groups,

(i) Conducting

(ii) Insulating

(iii) Magnetic material.



The design of electrical machines and equipments mainly depends on the quality of these materials. Low grade materials result in bulky and costly equipment generally.



Conducting material:
Conducting materials used, are copper' and aluminium. Insulating materials used are cotton, silk, wood, paper rubber mica, asbestos, polythene, pvc, bakelite etc. These materials are classed according to their temperature withstanding capability. Magnetic materials used as silicon steel and nickel iron alloys. The following grades of silicon steel are mainly used in various electrical machines:



E11 , E12 , E21 , E31 , E41 , E42 , E43 , E310 , E320 , E330



In the above E represent electrical grade silicon steel. The first figure indicates the percentage of silicon in the steel.



1. Low percentage.

2. Average percentage.

3. Above average percentage.

4. High percentage.



The second figure indicates the specific losses in the steel at 50 Hz



1. Normal.

2. Average.

3. Low.