The document discusses moving iron type instruments, which have attraction and repulsion types. They work by having a soft iron vane that moves when current flows through a coil, with the attraction type moving towards the stronger magnetic field and the repulsion type having two soft iron rods that repel each other. Moving iron type instruments are cheap, sturdy, and reliable but have less precision for DC measurements due to iron hysteresis. Dynamo type wattmeters also measure power by having the torque produced by the current proportional to the voltage times the cosine of the phase angle.
The armature winding is the main current-carrying winding in which the electromotive force or counter-emf of rotation is induced.
The current in the armature winding is known as the armature current.
The location of the winding depends upon the type of machine.
The armature windings of dc motors are located on the rotor, since they must operate in union with the commutator.
In DC rotating machines other than brushless DC machines, it is usually rotating.
The armature winding is the main current-carrying winding in which the electromotive force or counter-emf of rotation is induced.
The current in the armature winding is known as the armature current.
The location of the winding depends upon the type of machine.
The armature windings of dc motors are located on the rotor, since they must operate in union with the commutator.
In DC rotating machines other than brushless DC machines, it is usually rotating.
This presentation is about the whole pricipal about DC machine. It explain the various important parts of dc machine.It tells about how many types of losses are present in DC machine.
Winding
What is Armature winding?
Terms related to armature winding.
Single layer and double layer windings.
Comparison between closed and open windings.
Types of DC armature winding.
Types of AC armature winding.
This presentation is about the whole pricipal about DC machine. It explain the various important parts of dc machine.It tells about how many types of losses are present in DC machine.
Winding
What is Armature winding?
Terms related to armature winding.
Single layer and double layer windings.
Comparison between closed and open windings.
Types of DC armature winding.
Types of AC armature winding.
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1. Dept of E&E ELE101/102 1
Moving Iron type instruments
•Attraction type
•Repulsion type
Basic types:
Principle:
A soft iron vane (moving iron) which is mounted on the spindle
moves when the operating current flows through the coil.
2. Dept of E&E ELE101/102 2
Attraction typeMoving Iron type instruments:
Construction:
When current flows through the coil, a soft iron piece moves from
the weaker magnetic field towards the stronger field.
3. Dept of E&E ELE101/102 3
Attraction typeMoving Iron type instruments:
Working:
Td α mean of i2
over a cycle.
Tc α θ
In steady state, Tc=Td
θ α mean of i2
over a cycle
Scale is not uniform
4. Dept of E&E ELE101/102 4
Repulsion type
θ α mean of i2
over a cycle
Scale is not uniform
Moving Iron type instruments:
When current flows through the coil, Two soft iron rods get
magnetized similarly, causing them to repel each other.
5. Dept of E&E ELE101/102 5
•Cheap and sturdy.
•Possess a good degree of reliability.
•Less friction errors
Advantages:
Disadvantages:
•Degree of precision of calibration is not high for dc
measurements due to hysteresis in iron parts
Moving Iron type instruments
6. Dept of E&E ELE101/102 6
Measurement of POWER:
Construction:
Dynamo type Wattmeter
7. Dept of E&E ELE101/102 7
Measurement of POWER:
Tdmean α VI cos φ
Since Spring control is used ; Tc α θ
At steady state, Td = Tc
Hence, θ α VI cos φ
Dynamo type Wattmeter
Working:
