Pmmc and moving iron

Pmmc and moving iron

1. MI – Attraction Type

2. MI – Repulsion Type

3. PMMC

4. PMMC

5. DYNAMOMETER This instrument is suitable for the measurement of direct and alternating current, voltage and power. The deflecting torque in dynamometer is relies by the interaction of magnetic field produced by a pair of fixed air cored coils and a third air cored coil capable of angular movement and suspended within the fixed coil.

6. Comparison between MI and PMMC Moving Iron (MI) Moving Coil (MC) High Power Consumption Low Power Consumption Air Friction Damping is used Effective Eddy Current Damping is used Non-Uniform Scale Uniform Scale Hysteresis loss exists here Absence of Hysteresis loss Used for both AC and DC measurements Used for DC measurements only Cheaper than MC Costlier than MI