HELMHOLTZ COIL - SINGLE AXIS LABORATORIO ELETTROFISICO The simple, economical solution that never goes out of style Integrating fluxmeters are often used to control permanent magnet devices by the use of sense coils. The Laboratorio Elettrofisico Helmholtz coils are an easy addition to any fluxmeter for a fast, accurate and low cost measuring technique to control the quality of permanent magnets. Our design consists of a pair of identical wound coaxial coils, connected in series at a fixed distance equal to their radius. This configuration permits the sample to be placed in a large uniformity central volume. • Meets international standards (IEC 60404-14) • Non-destructive method of testing • Feedback control for calibration and magnetization system MEASURING PRINCIPLE When connected to a fluxmeter, the Helmholtz coil provides an output flux Φ proportional to the magnetic moment Μ of the sample: Φ = KH • Μ, where KH is the coil’s constant (each coil is given with the proper certified constant). This measurement procedure is described in the International Standard IEC 60404-14. The magnetic moment is an essential magnetic property. For a permanent magnet sample, the magnetic moment Μ is the product of its magnetic polarisation Jd (in the working point) and its volume V; this gives directly the Helmholtz coil’s formula: For example: for ferrites and rare earth magnets, having essentially a linear J vs. H relationship in the second quadrant, the Jd is very clo

When connected to a fluxmeter, the Helmholtz coil provides an output flux O proportional to the magnetic moment M of the sample: M=KH O where KH is the coil's constant (each coil is provided with its own certified constant). This measurement procedure is described in the International Standard IEC 60404-14. The large volume with field uniformity in the center of the Helmholtz coils is approximately an ellipsoid having a major axis of 0.93 R and a minor axis of 0.62 R. The magnet to be measured should fit within this volume to have the best reading accuracy (uniformity within 1%). The resulting...

LABORATORIO ELETTROFISICO CUSTOM MAGNETIZING FIXTURES HIGH EFFICIENCY MAGNETIZERS WORKSTATIONS AND AUTOMATION SYSTEMS EFFICIENCY MAGNETIZERS AND PRECISION MEASURING EQUIPMENT FOR ALL MAGNETIC MATERIALS EUROPE | ITALY (HQ) Via G. Ferrari 14 Nerviano, MI 20014 +39 0331 589785 USA | MICHIGAN 40 Englewood Drive, Suite H Lake Orion, MI 48359 +1 248 340 7040 CHINA | SHANGHAI 389 Zhao Jia Jing Lu, building 4, Songjiang Qu, Shanghai Shi, 201613 +86 21 5401 9806 Contact us: sales@elettrofisico.com Founded in 1959, Laboratorio Elettrofisico is a global company specializing in engineering, designing, and...