Testing the magnetic characteristics of transformer cores and coils
2020-10-28
The LMG series of high-precision power analyzers can measure the magnetic characteristics of transformer cores and coils, as well as accurately measure power losses. High-frequency signals are used to measure the power loss of silicon steel cores and ferrite cores: accurate, simple, and real-time.
This includes peak magnetic flux, magnetic field strength, and the core's magnetic permeability under low or high-frequency operation. This is very helpful for quality control of magnetic components using cores.
Traditional measurement methods require sinusoidal magnetic field strength or expensive and complex signal sources. Because the focus of the test is on the saturation range, the output range of the signal source is very demanding. If there is an intelligent testing instrument that can achieve this with a low-cost power supply or even a mains supply with significant harmonic distortion, the testing will become simpler, more economical, and more efficient.
Measuring Power Loss
The loss of ferrite cores is proportional to the area of the hysteresis loop, and it is also related to temperature, frequency, magnetic flux density, ferrite material, and the geometric shape of the core. By applying an arbitrary waveform to the primary side of the core and then measuring the open-circuit voltage of the secondary side, the LMG series products can easily determine the loss.
The primary coil current peak (Ipk) is proportional to the magnetic field strength (Hpk), and the rectified value of the secondary coil open-circuit voltage (Urect) is proportional to the magnetic flux density. The area of the hysteresis loop is proportional to the energy loss of the core.
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