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Inst Tools > Blog > Electrical Theory > Moving Iron Vane Meter Movement

Moving Iron Vane Meter Movement

Last updated: August 7, 2018 5:53 pm
Editorial Staff
Electrical Theory
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The moving iron vane movement (Figure 1) can be used to measure both AC current and voltage. By changing the meter scale calibration, the movement can be used to measure DC current and voltage. The moving iron vane meter operates on the principle of magnetic repulsion between like poles.

The measured current flows through a field coil which produces a magnetic field proportional to the magnitude of current. Suspended in this field are two iron vanes attached to a pointer.

Moving Iron Vane Meter Movement

Figure 1 : Moving Iron Vane Meter Movement

The two iron vanes consist of one fixed and one movable vane. The magnetic field produced by the current flow magnetizes the two iron vanes with the same polarity regardless of the direction of current through the coil. Since like poles repel one another, the moving iron vane pulls away from the fixed vane and moves the meter pointer.

This motion exerts a force against a spring. The distance the moving iron vane will travel against the spring depends on the strength of the magnetic field. The strength of the magnetic field depends on the magnitude of current flow.

As stated previously, this type of meter movement may also be used to measure voltage. When this type of movement is used to measure voltage, the field coil consists of many turns of fine wire used to generate a strong magnetic field with only a small current flow.

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