BH Curve Apparatus (Transformer Type)

The BH Curve Apparatus (Transformer Type) is a laboratory instrument used to experimentally plot the magnetic hysteresis (BH) curve for ferromagnetic materials, utilizing a transformer model to study core behavior.

Description

Core Structure: The apparatus features a laminated iron core similar to that in transformers, fitted with primary and secondary windings.

Measurement: When an alternating current is passed through the primary coil, it magnetizes the core, generating a magnetic flux. The secondary coil detects the induced electromotive force related to flux changes.

Control and Indication: The system includes variable voltage sources, ammeters, and voltmeters or moving coil meters to measure magnetizing current and magnetic field strength (

H

H), as well as induced voltage proportional to flux density (

B

B).

Graphical Plotting: Using the readings from the meters, a plot of

B

B (magnetic flux density) versus

H

H (magnetic field strength) is obtained, thus illustrating the magnetic hysteresis loop.

Educational Importance: This apparatus helps demonstrate essential magnetic properties such as retentivity and coercivity, and is widely used for curriculum in physics and electrical engineering.

The transformer-type BH Curve Apparatus makes it possible to conveniently study the magnetic response and memory of transformer cores and other ferromagnetic materials in teaching and research environments.