Application: Materials Research & Testing / Susceptor heating
Industry: Research and Development (R&D) in Materials Science
Application Objectives: A University in Spain aims to achieve energy efficiency by heating small magnets (less than 5 mm) in an organic or polymer matrix. The target temperature is 100-120°C, and the samples are either parallelepipeds (20x20x10 mm) or cylinders of similar dimension
Equipment:
- Power Supply Models: SHT-2/400, 0UPT-035-230, SBT-3/1200, 0UPT-024-200, SMT-5/200*
- Heat Station Models: HS-4W, SHT-2: 2 kW, 400 kHz system
- Test Coils: Various Ultraflex Lab Coils
- Thermal Camera (0-650°C; Emissivity – 0.85)
Process:
The testing process began with trials at medium frequencies (100kHz and 300kHz) to evaluate the performance of two coils with different diameters. Temperature measurements ensured samples did not exceed 120°C, and a coil simulation illustrated the magnetic field distribution. Various samples were heated using different power supplies, heat stations, and test coils to identify optimal heating conditions for the small magnets in the polymer matrix. Secondary tests used a higher frequency system (up to 1.2MHz) and a 5kW system to enhance heating efficiency and magnetic field strength
Results and Conclusions
Initial tests showed the polymer strip sample heated up to about 80°C, but deformed and moved away from the coil, reducing energy transfer. A tighter coil design is needed to maintain efficiency despite deformation. The polymer disc didn’t heat much, moving slightly from the magnetic field but showing minor temperature rise due to small traces and hysteresis losses. Larger samples might respond better. Higher frequency tests were less effective, with heating mainly from hysteresis losses. The control sample showed no temperature change. Secondary tests with a 5kW system increased magnetic field strength, suggesting more coil turns could boost field strength and frequency, though contact with the coil might cause cooling.
In conclusion, the 5kW system was recommended for the best results, with special attention to coil design to ensure the correct field strength. The tests highlighted the importance of optimizing both the magnetic field strength and the coil design to achieve efficient heating of the small magnets.
Reference Info: AR 3464-7622
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