Construction And Working Of Pmmc Instrument Pdf

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construction and working of pmmc instrument pdf

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Several electrical machines and panels are fitted on board so that the ship can sail from one port to another, safely and efficiently. The electrical machinery and system require scheduled maintenance and checks to avoid any kind of breakdown during sailing. Different instruments are used onboard for measuring several electrical parameters to analyze and keep these machines in proper running condition.

What is PMMC Instrument : Construction & Its Working

The PMMC works on the electromagnetic effect. A permanent magnet is used to produce magnetic flux and a coil that carries the current to be measured moves in this field. As the pointer is connected to the coil it gets deflected in proportion with the current. When a current carrying conductor placed in the magnetic field experiences a force. It is given by the expression is given below,. The basic construction of PMMC is shown in above fig. This light rectangular coil carries the current to be measured.

Facebook Twitter. The permanent magnet moving coil instrument is the most accurate type for dC measurements. Working principle of pmmc instrument is the same as that of the d'Arsonval type of galvanometers, the difference being that direct reading instrument is provided with a pointer and a scale. Construction of pmmc instruments:. The general constructional features of pmmc instrument are shown in below figure:. Moving coil: The moving coil is wound with many turns of enamelled or silk covered copper wire.

There are different electrical machines are used in the ship so that it can travel from place to another safely as well as capably. But these machines need maintenance while traveling to avoid any type of breakdown. To measure different electrical parameters on the ship, different instruments are used so that we can check the machines to maintain their proper working condition. Similarly, an instrument like PMMC permanent magnet moving coil is frequently used on ships as well as different applications. This article discusses an overview of the PMMC instrument. This instrument is simple as well as most frequently used on ships with sophisticated names. These instruments are used when an exact measurement is required as well as to aid while maintaining electrical equipment.

Moving Coil Instrument Working Principle

It operates on the principle that the torque is exerted on the moving coil placed in the field of the permanent magnet. The moving coil and permanent magnet are the main part of the PMMC instrument. The parts of the PMMC instruments are explained below in details. Moving Coil — The coil is the current carrying part of the instruments which is freely moved between the stationary field of the permanent magnet. The current passes through the coil deflects it due to which the magnitude of the current or voltage is determined. The coil is mounted on the rectangular former which is made up of aluminium. The former increases the radial and uniform magnetic field between the air gap of the poles.

The PMMC instrument working principle is when the torque is applied to the moving coil that is placed within the permanent magnet field, and then it gives a.

Permanent Magnet Moving Coil Instrument (PMMC) – Working and Application on Ship

Moving Coil:. The moving coil made up of copper is wound with many turns on the rectangular Aluminum former. This Aluminum former is pivoted on the jewelled bearing. The coil can move freely in the magnetic field produced by the Permanent Magnet System. In case of PMMC voltmeters, coil is generally wound on metallic frame to have the required electromagnetic damping.

Permanent Magnet Moving Coil or PMMC Instrument

Hi friends, in this article, I am going to discuss about moving coil instrument working principle and other related information. You will appreciate my effort, I hope so. The simple view of construction of moving coil instrument is shown in the figure. It consists of a powerful permanent shoe magnet. A light rectangular coil of many turns of fine wire is wound on a light aluminum former. An iron core is inserted inside the coil to reduce reluctance for the magnetic lines of force. The coil is mounted on the spindle and acts as the moving element.

Electrical Academia. Figure 1 shows the basic construction of a PMMC instrument. A moving-coil instrument contains principally of a permanent magnet to offer a magnetic field and a small lightweight coil pivoted within the field. A soft iron core is included between the poles of the magnet so that the coil rotates in the narrow air gap between the poles and the core. The resulting deflection of the coil is indicated by a pointer that moves over a calibrated scale. In addition to a deflecting force provided by the coil current and the field from the permanent magnet, a controlling force is needed. This is the force that returns the coil and pointer to the zero position when no current is flowing through the coil.

Construction. A coil of thin wire is mounted on an aluminium frame (spindle) positioned between the poles of a U shaped.

Construction of PMMC Instrument

It is one of the simple and most used instruments on board with sophisticated names. They are used on board to assist in regular maintenance of electrical equipment or when precise measurements are required. It is a simple machine that creates stationary magnetic fields with two powerful permanent magnets. A PMMC Equipment consists of two main parts; moving coil and a permanent magnet along with other parts. These parts are explained below:.

Все трое как завороженные смотрели на это зрелище, не лишенное какой-то потусторонней величественности. Фонтейн словно окаменел. Когда же он пришел в себя, его голос был едва слышен, но исполнен решимости: - Мидж, вызовите аварийную команду. Немедленно. В другой стороне комнаты зазвонил телефон. Это был Джабба.

Стратмор сжимал ее все сильнее.

Nsa. dov Переведя взгляд на рабочий кабинет Стратмора, она поняла, что больше не может ждать, пусть даже помешает его разговору по телефону. Она встала и направилась к двери. Хейл внезапно почувствовал беспокойство - скорее всего из-за необычного поведения Сьюзан. Он быстро пересек комнату и преградил ей дорогу, скрестив на груди руки.

Ему удалось проскользнуть внутрь в последнюю секунду перед тем, как дверь закрылась. Человек улыбнулся: охота становилась интересной. Беккер здесь… Я чувствую, что. Он двигался методично, обходя один ряд за другим.

Working principle and construction of PMMC


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