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on video Moving Iron Instrument : Working, Types, Torque & Its Applications

 


The moving iron instrument is the most commonly used ammeter & voltmeter used at power frequencies in laboratories or switchboards. These types of instruments are designed in such a way to measure voltage & current to the accuracy required in most engineering works. As compared to any other types of AC instruments with the same accuracy & ruggedness, these are not expensive. So this article gives brief information on a moving iron instrument – working with applications.

What is a Moving Iron Instrument?
The instrument which has the moving iron used to measure the current or voltage flow is called the moving iron instrument. The working principle of moving iron instruments mainly depends on the iron movement attracted by the magnetic field to it & repulsion among them. Here, the magnetic field is generated by the current within the coil. The attraction force in this instrument mainly depends on the magnetic field's strength.
The magnetic field is induced by the electromagnet whose magnetic field's strength mainly depends on the magnitude of the current supplies throughout it. The moving iron instrument diagram is shown below.
This moving iron instrument can be used as a voltmeter or an ammeter. If this instrument is used as an ammeter then it has less number of thick wire turns and if this instrument is used as a voltmeter then it has more thick wire turns. So this instrument simply supports both AC & DC.

Construction of Moving Iron Instrument
The moving iron instrument uses a moving element like a plate or soft iron vane. The vane is arranged in such a way that it moves freely within the magnetic field of the inactive coil. This coil is simply excited by the current/voltage whose magnitude is to be measured.

This instrument uses an electromagnet like the inactive coil. This electromagnet is not a permanent magnet where the strength of this magnetic field enhances or reduces through the magnitude of the current flow throughout it.

Working of Moving Iron Instrument
The moving iron instrument uses the stationary coil of aluminum/copper wire which functions like an electromagnet once current flows throughout it. The magnetic field strength induces through the electromagnet is directly proportional to the current flowing throughout it.

The vane of the iron/plates supply throughout the coil increases the stationary coil's inductance. Here inductance is the conductor's property which enhances their electromotive force once the unstable current supplies through it.

The electromagnet will attract the iron vane which passes throughout the coil and looks to reside in the minimum reluctance lane. The vane passes throughout the coil and will experience a repulsion force that is caused by the electromagnet. This force increases the coil inductance’s strength and this occurs due to the reluctance & inductances being inversely proportional to each other.

Types of the Moving Iron Instruments
These instruments are classified into two types attraction type and repulsion type which are discussed below.

Attraction Type Moving Iron Instrument
The attraction type moving iron instrument working principle mainly depends on magnetic attraction, because it attracts an iron piece once arranged close to a magnetic field. Here, this magnetic field is generated through an electromagnet.


 


The moving iron instrument is the most commonly used ammeter & voltmeter used at power frequencies in laboratories or switchboards. These types of instruments are designed in such a way to measure voltage & current to the accuracy required in most engineering works. As compared to any other types of AC instruments with the same accuracy & ruggedness, these are not expensive. So this article gives brief information on a moving iron instrument – working with applications.

What is a Moving Iron Instrument?
The instrument which has the moving iron used to measure the current or voltage flow is called the moving iron instrument. The working principle of moving iron instruments mainly depends on the iron movement attracted by the magnetic field to it & repulsion among them. Here, the magnetic field is generated by the current within the coil. The attraction force in this instrument mainly depends on the magnetic field's strength.
The magnetic field is induced by the electromagnet whose magnetic field's strength mainly depends on the magnitude of the current supplies throughout it. The moving iron instrument diagram is shown below.
This moving iron instrument can be used as a voltmeter or an ammeter. If this instrument is used as an ammeter then it has less number of thick wire turns and if this instrument is used as a voltmeter then it has more thick wire turns. So this instrument simply supports both AC & DC.

Construction of Moving Iron Instrument
The moving iron instrument uses a moving element like a plate or soft iron vane. The vane is arranged in such a way that it moves freely within the magnetic field of the inactive coil. This coil is simply excited by the current/voltage whose magnitude is to be measured.

This instrument uses an electromagnet like the inactive coil. This electromagnet is not a permanent magnet where the strength of this magnetic field enhances or reduces through the magnitude of the current flow throughout it.

Working of Moving Iron Instrument
The moving iron instrument uses the stationary coil of aluminum/copper wire which functions like an electromagnet once current flows throughout it. The magnetic field strength induces through the electromagnet is directly proportional to the current flowing throughout it.

The vane of the iron/plates supply throughout the coil increases the stationary coil's inductance. Here inductance is the conductor's property which enhances their electromotive force once the unstable current supplies through it.

The electromagnet will attract the iron vane which passes throughout the coil and looks to reside in the minimum reluctance lane. The vane passes throughout the coil and will experience a repulsion force that is caused by the electromagnet. This force increases the coil inductance’s strength and this occurs due to the reluctance & inductances being inversely proportional to each other.

Types of the Moving Iron Instruments
These instruments are classified into two types attraction type and repulsion type which are discussed below.

Attraction Type Moving Iron Instrument
The attraction type moving iron instrument working principle mainly depends on magnetic attraction, because it attracts an iron piece once arranged close to a magnetic field. Here, this magnetic field is generated through an electromagnet.


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