Moving Coil

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Moving Coil


in low-frequency measurement technology, a component of moving-coil measuring systems that is used in light-beam oscillographs and moving-coil galvanometers. A moving coil is a light coil of wire that is located between the poles of a permanent magnet. In a galvanometer, the moving coil is suspended from very thin metallic ribbons; in an oscillograph, it consists of a very thin wire to which a small mirror is attached.

When a current flows through a moving coil, the coil is deflected in the magnetic field. In moving-coil galvanometers, the magnitude of the deflection is read by means of a microscope. In light-beam oscillographs, it is read on the basis of the deflection of a light beam reflected from the mirror.


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References in periodicals archive ?
Founded in 1990 in Carlsbad, California USA, SMAC has now grown to become a world leader in Moving Coil technology and is now the largest manufacturer of Moving Coil Actuators in the world.
Improved bandwidth capacity is available at low frequencies where the stiffness of the panel material, or of the narrow air gap behind a SoundVu panel, would result in premature roll-off with a moving coil exciter.
The maintenance costs of electromagnetic systems are typically low, although the systems used for maintaining alignment (mechanical or air bearings and diaphragms) often require maintenance to ensure optimum performance, and the leads to the moving coil have a finite fatigue life.
While some expensive moving coil cartridges had combined wonderful sound with trackability and high output, the Blue Point was one of the first to do so at a very reasonable price.
Killion and his Etymotic Research engineers have combined the ACCU*Chamber driver housing with a specially designed high-output 8 mm neodymium moving coil driver that achieves a 3 dB increase in sensitivity over the normal 8 mm drivers on the market.
Ceramic and piezoelectric speakers are dramatically different from conventional moving coil speakers.
The second group are conventional moving coil designs that have used unconventional diaphragm materials in an attempt to deal with the inevitable flexure or "breakup" resonance modes of flat diaphragms.