Principle of Operation of the Iron Loss Tester
Release Time:
2025-08-11
The core principle of the iron loss tester is to quantify the energy dissipation of magnetic materials in an alternating magnetic field, leveraging electromagnetic induction and a closed magnetic circuit design.
The core principle of the iron loss tester is to quantify the energy dissipation of magnetic materials in an alternating magnetic field, leveraging electromagnetic induction and a closed magnetic circuit design.
Core Measurement Principle
The iron loss tester primarily relies on the following two physical principles to perform its measurement function:
Closed Magnetic Circuit Method:
Place the U-shaped magnet, wound with excitation coils and flux detection coils, on the surface of the material being tested to form a closed magnetic circuit.
The excitation coil applies voltage to generate an alternating magnetic field, while the flux detection coil senses changes in voltage.
By calculating the product of the magnetizing current and the induced voltage, and combining it with the effective weight of the material, we obtain the specific iron loss value per unit mass (W/kg).
Electromagnetic Induction Method:
A sine wave signal generated by a 50Hz oscillator is amplified in power and then used to drive the probe, producing a preset magnetic flux density.
A voltage comparison circuit is used to maintain a constant magnetic flux density, and after multiplying the current signal with a reference signal, the result is filtered and corrected before directly displaying the iron loss value.
Key Points for Technical Implementation
Magnetic circuit compensation design: Utilizing a U-shaped magnet with a magnetic cross-sectional area significantly larger than that of the test specimen, ensuring that more than 99% of the magnetic flux passes through the material being tested, thereby minimizing measurement errors.
Signal Processing System: Modern devices widely adopt microcontroller-based control technology, integrating A/D and D/A conversion modules to achieve digital filtering and automatic correction.
Standard Compatibility: Mainstream instruments comply with the GB/T 13789-92 standard and support the detection requirements for silicon steel sheets with magnetic sensitivity accuracy of 3%.
Technology Evolution Direction
The latest model (such as the TYU-2002M) enhances performance through the following innovations:
Integrating the rotating magnetic field measurement module enables simultaneous acquisition of iron loss and magnetic flux parameters.
The RS-232C interface is used to enable data output and printing functions.
Equipped with a portable probe design, it can measure samples as narrow as 8mm in width.
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