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7. TRANSFORMER
7.1 Output
The output of a transformer can be found out in terms of net cross sectional area
of the core, window area, and window space factor; the flux density, current
density and frequency are taken as constant.
The basic equati
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8.2 Special requirements
The method of working out a typical design by analysis program as described
earlier can be generally employed for practically carrying out all the calculations
connected with electrical machine design. It must, however,
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5. PROCEDURE FOR DESIGN OF A SQUIRREL CAGE INDUCTION MOTOR
The following points are to be noted in designing three phase induction motors :
1. Specifications of the induction motor to be designed.
2. Output equation.
3. Choose specific magnetic a
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7.5 Procedure for Design 0f Transformers
The following points may be noted in designing transformers:
1.
2.
3,
4.
5.
6.
7.
8.
Specifications of the transformer to be designed.
Choose voltage per turn Et Volts.
Choose maximum flux density Bm Wb/m
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7.4 Methods of Cooling Transformers.
7.4.1 A short account of these methods is as under:
AN. In this method the core and coils are open to the air and are cooled by natural
radiation and convection of heat from their surfaces. This method is conf
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2. HEATING AND COOLING OF MACHINES AND APPARATUS
Due to energy losses in a machine, it gets hot. Cooling is the function of the facilities
for dissipation of heat produced in the machine so that it can work satisfactorily
within the required
temp
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3. ELECTRICAL ENGINEERING MATERIALS
Electrical materials used in the construction of all commercial machines may
be broadly classified into three groups; (i) Conducting. (ii) Insulating (iii)
Magnetic.
Design of electrical machines mainly depends
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6. DESIGN OF SYNCHRONOUS MOTORS
6.1 Design.
The procedure for designing synchronous motors is similar to that of designing
alternators. The stator is the armature and the field is on the rotor. The
synchronous motor should have an arrangement for
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1. DESIGN
1.1. Introduction
Building electrical equipment as economically as possible that will be suitable for
the intended application and will meet the performance expectations is of
paramount importance to manufacturers of electrical apparatu
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8. APPROACH TO COMPUTER AIDED DESIGN
We begin with the assumption that a person is familiar with conventional design
procedures for rotating electrical machines such as the squirrel cage induction
motors and alternators (refer earlier chapters).