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Electrical Engineering - what is the Advantages and Disadvantages Permanent Magnet Type
Electrical Engineering
⇒ Topic : Advantages and Disadvantages Permanent Magnet Type
what is the Advantages and Disadvantages Permanent Magnet Type
Gopal
said on : 2019-03-04 20:54:18
Advantages
Uniform scale
Since driving power is small, power consumption is low.
Due to aluminium or copper former, hysteresis loss is absent.
Very effective and reliable eddy current damping.
Torque-weight ratio is very high.
Due to application of intense polarized or unidirectional field, stray magnetic field has no effect.
Using shunts or multipliers, ranges can be extended.
Disadvantages
AC quantity cannot be measured.
Compared to moving iron instruments, these instruments are costlier.
Friction, temperature, ageing of control springs, and permanent magnets might introduce errors
!! OOPS
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