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Magnetics

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Inductively coupled devices

Electromagnetic Induction.
The relationship between the physics and the small-signal electrical behaviour of transformers
By David W Knight

EM_induction.pdf (version 0.10 provisional, 0.7 MiB)

Overview:
This article introduces the theory required for the analysis and modelling of inductively-coupled networks. The material presented is applicable to electrical transformers of all types, but the examples given relate primarily to high-frequency signal-processing applications. Familiarity with circuit analysis technique is assumed; but magnetism is discussed at an elementary level in order to ensure that the fundamental concepts are understood.

Familiarity with the basic properties of ideal transformers is here assumed. A brief introduction is given in AC Theory, section 41.


Current transformers are discussed in the RF bridges section.


C F Palmer induction coil

C F Palmer induction coil

C F Palmer induction coil
Electromagnetic induction apparatus (teaching laboratory demonstration). Made by C. F. Palmer Ltd., (Charles Fielding Palmer) Effra Road, London S.W.2. Probably ca. 1950 (no date marking). Distance scale is in cm. Screw threads are BA.
     Despite the Victorian appearance, the use of plasticised PVC sleeving (on buzzer coil leads) indicates that manufacture cannot have taken place until some time considerably after the invention of PVC (1926). PVC started to come into widespread use in the late 1940s.


Palmer induction Apparatus with Ferranti NSP2 strobotron
Palmer induction apparatus lighting a Ferranti NSP2 neon strobotron tube. Power supply is 1.5 V DC.


Tinsley 4229B variometer
Tinsley 4229B Precision Variable Mutual Inductor, 1 μH to 11.1 mH.
Variometer using coils wound on marble formers. Secondary is centre-tapped to enable use in Heaviside-Campbell and Carey-Foster bridges.
Top panel demensions are 42 cm × 36 cm. Overall height: 159 mm. Weight: 15.6 kg.
For more info, see Tinsley 2002 catalogue / Product Range / Specialist Standards Equipment.
Widely used in magnetic susceptometry.


© D W Knight 2009 - 2013.
David Knight asserts the right to be recognised as the author of this work.

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Magnetics

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