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swinburnes test is a type of SWINBURNE'S TEST:-
Ø It is a simple method in which losses are measured separately and from their
knowledge, efficiency at any load can be pre-determined in advance. The only
running test needed is a no load test.
Ø Swinburnes test is applicable to those machines in which flux is practically
constant i.e. Shunt wound and Compound wound machines.
Ø The machine is running as a motor on no-load at its rated voltage and its speed be
adjusted to its rated value using Shunt regulator.
Ø The no-load armature current Iao is measured using an ammeter, where as shunt
field current Ish is given by another ammeter. The no-load input current is given
by Io = Iao + Ish
Ø Let the supply voltage be V volts
N o -l oa d i nput = V Io watts
P o w er input to armature = V Iao watts
P o w er input to shunt = V Ish watts
No-load input supplies Copper losses (Armature & Field), Iron losses (Hysteresis
& Eddy current) & Mechanical losses ( Friction losses & Windage).
Constant losses = No load input power Armature copper losses
Wc = V Io - Iao² Ra watts .
Ø Predetermination of efficiency of a motor at any load
Input = V I w at ts.
Armature Cu losses = Ia
2 Ra
C o n st a nt losses = Wc
T o tal losses = W c + ( I - Ish)² Ra
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