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Losses are measured separately in this method, and efficiency at any desired load is predetermined. The iron and friction losses can be determined by measuring the input to the machine at no-load. The machine is run as a motor at normal voltage and speed. The copper losses are calculated from measured values of the various resistances. This method is only applicable to level compounded and shunt motors. Figure 5.29shows the circuit diagram of Swinburne's test.
Figure 5.29 Swinburne's Test
Let Vt be the supply voltage, I0 be the input armature current at no-load(measured by ammeter A1) andIsh be the shunt field current(measured by ammeter A2) for Figure 5.29.
Therefore, no-load armature current (Ia0) = I0 - Ish, no-load input = VtI0 W, power input to the armature = Vt (I0 - Ish) W and power input to shunt = VtIsh W.
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Is swinburnes test direct or indirect test?
in this test their is a no load on dc shunt motor so it is an indirect test
What is the important of brush in DC machine?
The slip rings are the most important brush in DC machine.
What is swinburne's test of DC shunt motor?
swinburne's test on dc shunt machine is to predetermine the efficiency of the dc machine , but it is not accurate it is just like estimation of efficiency of dc shunt machine when it is run as a motor and a generator............................
How many types of DC machine?
05 types of dc machines
Why laminations are used for iron parts of a dc machine?
Laminations minimize eddy currents, or current flow across the iron parts. This is one method to minimze stray losses.
What motor is NOT suitable for use as a DC machine?
What motor is NOT suitable for use as a DC machine?
Is swinburnes test direct or indirect test?
in this test their is a no load on dc shunt motor so it is an indirect test
What is the important of brush in DC machine?
The slip rings are the most important brush in DC machine.
What is swinburne's test of DC shunt motor?
swinburne's test on dc shunt machine is to predetermine the efficiency of the dc machine , but it is not accurate it is just like estimation of efficiency of dc shunt machine when it is run as a motor and a generator............................
What is an dc meachine?
it is a machine which operates on the dc power source.
Why use DC for testing?
A: It can be AC but DC provide a stable environment to get reliable results
How many types of DC machine?
05 types of dc machines
Derive emf equation of a DC machine?
equation of ac machine
How do you make DC generator?
A DC generator is a DC machine that is driven by an external rotating force. It is constructed the same as a DC motor.
Why laminations are used for iron parts of a dc machine?
Laminations minimize eddy currents, or current flow across the iron parts. This is one method to minimze stray losses.
Whether a pmbldc motor is a dc or ac motor?
PMBLDC machine is actually an ac machine and due to power electronics components it's output is dc ,so therefor it is called 'dc'
What component of a welding machine changes AC current to DC current?
Yes, it is normal for a welding machine to convert AC voltage to a DC voltage.
