Electrical Machines Lab


Electrical Machine laboratory conducted for 2nd and 3rd years Under Graduates: In this course students perform some basics experiments on Transformers, DC machines, Inductions motors and Synchronous machines. The Electrical Machines Laboratory supports teaching research and consultancy work on Electrical machines and drives. Through hands-on experiments with real machines, students gain practical experience on transformers and various types of machine drives. The laboratory can also be used for project work related to electrical machines and energy conversion.

The four main purpose of an electrical machines laboratory are:

To provide the student with practical knowledge of handling the electrical machines.
To correlate the theoretical classroom treatment with actual machine characteristics.
To demonstrate the most suitable testing techniques
To educate engineer researchers and to conduct research in all aspects of electrical and electromechanical energy conversion.


Course Objectives



To study the load characteristics of DC generator
To study about the internal and external characteristics.
Conduct load test on DC shunt motor
Study the characteristics of motor and speed-torque and HP-efficiency characteristics
Conduct Swinburne’s test on DC motor and calculate its efficiency
Perform no load test and calculate efficiency at various loads.
Conduct back to back test or regenerative test on DC motor- generator set.
Conduct Field’s test on DC series machine and determine its efficiency.
Conduct retardation test on a DC motor
Speed control of a DC motor
Ward Leonard method of speed control of D.C. motor.
Voltage regulation of alternator by EMF and MMF method
Voltage regulation by ZPF method.
Slip test on an alternator
Performance of synchronous generator connected to infinite bus, under constant power and variable excitation & vice – versa
V and Inverted V curves of a synchronous motor.
Calculation of Reactances X1, X2 & Xo for Synchrounous generator
Calculation of fault currents for all faults (Line to ground, Line to line & Double line to ground.)


Course Outcomes



Able to understand characteristics of DC shunt and compound generators
Able to understand the performance characteristics of a DC generator
Understanding the Motor characteristics and working.
The performance of DC motors is understood
The DC motor characteristics are studied and understood
Understand the regenerative nature of DC machines
Students can understand the series motor operation and its performance.
Students can understand the process of retardation of D C motors
Able to understand different methods of calculating efficiency
Students will be able to understand the different methods of speed control like armature voltage and flux control
Understand the various speed control methods
Control speed of the machine in both directions
Students will be able to understand voltage regulation
Students get exposure to synchronous machines
Students will be able to understand voltage regulation
Students get exposure to synchronous machines
Understand the concept of slip and to determine reactance and regulation of the alternator
To understand the performance of a generator under infinite bus
To understand the performance of the synchronous motor and to understand about power factor and V and inverted V curves
To understand the performance of the synchronous generator & understand different types of fault currents & its severity.



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Don Bosco Group of Institutions,
Mysore Road, Kumbalagodu,
Bangalore - 560074, Karnataka, India.
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9900-361-100
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