A loudspeaker produces sound by converting electrical signals from an audio amplifier into mechanical motion. Sound is created from the forward and backward motion of the loudspeaker cone, which is a concave plastic or paper disc. The cone is mounted and centred on a concave metal frame by a ring of flexible rubber. Glued to the centre of the cone is a hollow cylinder of thin, lightweight aluminium. A length of thin, insulated wire is wound upon the bobbin to form the voice coil; both ends of the voice coil wire are connected to the voice coil terminals on the frame. The voice coil is positioned inside a narrow cylindrical groove or air gap in the centre of a magnet. The coil is suspended in the air gap by a flexible fabric disc. An audio amplifier is connected to the voice coil terminals. The coil emits a magnetic field as audio signals from the amplifier travel through the voice coil wire. The voice coil field alternately pulls and pushes the coil, bobbin and cone assembly towards and against the magnetic field from the magnet, which causes the forward and backward cone motion.
Instrument used to detect and measure electrical current. A coil of wire pivoted between the poles of a permanent magnet is turned by the motor effect of an electric current (by which a force acts on a wire carrying a current in a magnetic field). The extent to which the coil turns can then be related to the magnitude of the current. The sensitivity of the instrument depends directly upon the strength of the permanent magnet used, the number of turns making up the moving coil, and the coil's area. It depends inversely upon the strength of the controlling springs used to restrain the rotation of the coil. By the addition of a suitable large resistor, a moving-coil meter can be adapted to read potential difference in volts. A simple moving-coil meter. Direct electric current (DC) flowing through the wire coil combined with the presence of a magnetic field causes the coil to rotate; this in turn moves a pointer across a calibrated scale so that the degree of rotation can be related to the magnitude of the current.
The torque on the moving coil will reverse at twice the frequency of the supply, causing the pointer to vibrate. High-quality a.c. measuring instruments that incorporate a moving coil are, of course, common but incorporate a rectification circuit to supply the coil.
If this is a homework related question, you really should consider trying to solve it yourself before looking at this answer. Otherwise, the value of the lesson, and the reinforcement provided by the assignment, will be lost to you.A moving coil measuring instrument has a coil attached to the indicator, surrounded by a magnet.A moving iron measuring instrument has a magnet attached to the indicator, surrounded by a coil.In both cases, the indicator is driven by magnetic torque caused by current flow in the coil.
If you are questioning about different relay (contactor) constructions, the terms moving coil and moving iron designate what part of the relay moves and carries the conductor that makes or breaks a circuit.
Yes, but the sensitivity and frequency response will be very poor. The diaphragm on a microphone, corresponding to the voice coil and cone on a speaker, is extraordinarily light and compliant.
pmmc stands for permanent magnet moving coil instruments these instruments are secondary measuring instruments in these instruments a permanent magnet is installed and a moving coil in this way when current is passed through the fixed coil then a force will be developed on the moving coil and thus it moves and with this moving pointer moves on the scale and gives the corresponding reading . if someone wants to read it thoroughly then he can try ashfaq hussain , j.b.gupta of basic elelctrical engg. for b.tech first year .
it will not work
Different b/w a moving coil instrument and a moving iron instrument
It is related to moving coil type instrument
A: A speaker has a magnet and the wire is suspended in a zone by a cone whereby +/- current will make the coil move up or down moving the coil and moving the cone causing air displacement as waves of pressure that our ears can detect as sounds in our brains.
mic or moving iron coil is instrument type works on ac and dc
major disadvantage is that moving coil galvanometer is not suitable for a.c measurement
stepper motor, voice coil
mic or moving iron coil is instrument type works on ac and dc
power must be gotten thru moving parts to the coil slip rings, festoons, tinsel
Yes, but with vey low sensitivity and poor frequency response.
Not enough information. Which actuator motors are you talking about, and what about them?
a series resistence with its coil