Magnetic Property Tester
The magnetic property tester is core precision testing equipment for the NdFeB permanent magnet industry. The complete system consists of a high-power electromagnet mainframe paired with an AMT automatic permanent magnet characteristic measuring instrument. It professionally tests the complete demagnetization curve of magnets and accurately measures key magnetic parameters including remanence Br, coercivity Hcj, intrinsic coercivity Hcb and maximum energy product (BH)max. It is indispensable for raw material verification, grade classification, process control and finished product grading before delivery.
Working Principle
The sample is placed in the gap between electromagnet poles. The equipment applies continuously controllable external magnetic field via excitation coils to scan the whole process of forward magnetization and reverse demagnetization of the magnet. Sensors collect magnetic field strength and magnetic flux density signals in real time. The control system automatically plots the full B-H demagnetization curve, and the software calculates key magnetic indexes to directly judge whether the material grade meets specifications.
Main Applications
Precisely test core magnetic properties such as remanence, coercivity, maximum energy product and squareness of all grades of NdFeB magnets, verify consistency between actual grade and designed grade.
Sampling inspection of incoming blanks and sintering process verification, troubleshoot low magnetic performance and performance dispersion caused by abnormal sintering temperature or formula ratio.
Differentiate temperature resistance and coercivity of magnets of various temperature grades (N/M/H/SH/UH/EH), supporting selection and control for high-temperature motor products.
Batch grading and sorting of finished products, categorize products by magnetic performance range to match specification requirements of different customer orders.
R&D of new material formulas, new process commissioning and failure analysis of defective products, providing accurate data for formula optimization and process improvement.
Generate standardized magnetic test reports to satisfy factory audit, third-party filing and product quality traceability requirements.
Core Equipment Advantages
Sufficient excitation magnetic field covers tests for conventional and high-coercivity high-temperature resistant NdFeB. It supports saturated demagnetization testing with complete and accurate curve measurement. High measurement repeatability and low data error. Minimal deviation in repeated tests on the same sample, ensuring consistent evaluation for batch products. Automatic closed-loop scanning test. One-click start for full automatic measurement, auto-generate B-H curve diagrams and parameter reports to reduce manual operation error. Customizable upper and lower tolerance limits in software for automatic pass/fail judgment, quickly screening out out-of-spec workpieces and fitting batch inspection. Open/closed protective structure for electromagnet chamber with safety interlock protection. Reliable safety shielding to avoid hazards from strong magnetic field during testing. Stable and durable operation, anti-interference against stray external magnetic field. Suitable for long continuous laboratory testing with easy calibration and maintenance.
Supporting Production Sequence
Magnet sintering & forming → Sampling & grinding → Magnetic testing & grading by magnetic property tester → Qualified products transferred for subsequent electroplating → Adjust sintering process for products with abnormal performance