EE2355 Design Of electrical machines lecture notes for EEE - Sixth (6th) Semester
EE2355 Lecture Notes
UNIT I INTRODUCTION
Major considerations in Electrical Machine Design - Electrical Engineering Materials – Space factor –
Choice of Specific Electrical and Magnetic loadings - Thermal considerations - Heat flow –
Temperature rise - Rating of machines – Standard specifications.
UNIT II DC MACHINES
Output Equations – Main Dimensions - Magnetic circuit calculations – Carter’s Coefficient - Net
length of Iron –Real & Apparent flux densities – Selection of number of poles – Design of Armature –
Design of commutator and brushes – performance prediction using design values.
UNIT III TRANSFORMERS
Output Equations – Main Dimensions - KVA output for single and three phase transformers –
Window space factor – Overall dimensions – Operating characteristics – Regulation – No load
current – Temperature rise in Transformers – Design of Tank - Methods of cooling of Transformers.
UNIT IV INDUCTION MOTORS
Output equation of Induction motor – Main dimensions – Length of air gap- Rules for selecting rotor
slots of squirrel cage machines – Design of rotor bars & slots – Design of end rings – Design of
wound rotor -– Magnetic leakage calculations – Leakage reactance of polyphase machines-
Magnetizing current - Short circuit current – Circle diagram - Operating characteristics.
UNIT V SYNCHRONOUS MACHINES
Output equations – choice of loadings – Design of salient pole machines – Short circuit ratio – shape
of pole face – Armature design – Armature parameters – Estimation of air gap length – Design of
rotor –Design of damper winding – Determination of full load field mmf – Design of field winding –
Design of turbo alternators – Rotor design.
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