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Table of contents
- moving-iron meter
- Moving Iron Vane Movement Review | Engineers Edge | leondumoulin.nl
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Figure below shows a simple moving iron instrument. The stationary coil is excited by the current or voltage under measurement. When the coil is excited, it becomes an electromagnet and the iron van moves in direction of offering low reluctance path. Thus the force of attraction is always produced in a direction to increase the inductance of coil. Mind that as the van follows the low reluctance path, the net flux in air gap will increase which means increased flux linkage of coil and hence inductance of coil will increase.
moving-iron meter
It shall also be noticed that, the inductance of coil is variable and depends on the position of iron van. Suppose that, at any instant of time current flowing in the coil is I. Let this deflection in pointer is due to deflection torque Td. Change in stored energy of coil.
Moving Iron Vane Movement Review | Engineers Edge | leondumoulin.nl
Neglecting second order and higher terms of differential quantities i. Thus we can write as. According to law of conservation of energy, this electrical energy supplied by the source is converted into stored energy in the coil and mechanical work done for deflection of needle of Moving Iron Instruments. Thus deflecting torque in Moving iron Instruments is given as.
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From the above torque equation, we observe that the deflecting torque is dependent on the rate of change of inductance with the angular position of iron van and square of rms current flowing through the coil. In moving iron instruments, the controlling torque is provided by spring.
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