Metis HyMPulse Pulsed Field Hysteresisgraph for Hard Magnetic Materials

Overview

The Metis HyMPulse is a high-energy pulsed-field hysteresisgraph engineered for the precise, contactless characterization of hard magnetic materials—including sintered NdFeB, SmCo, AlNiCo, and ceramic ferrites—under industrially relevant conditions. Unlike conventional DC or vibrating sample magnetometers (VSMs), which rely on extrapolation or low-field approximation to estimate coercivity, the HyMPulse applies controlled, microsecond-duration magnetic pulses up to >16 T, enabling direct measurement of intrinsic coercivity (HcJ) and remanence (Br) across the full hysteresis loop in all four quadrants. Its pulse-based architecture eliminates saturation limitations inherent in steady-state systems and avoids demagnetizing field artifacts through real-time geometric correction algorithms. Designed for metrology-grade reproducibility in R&D labs and production QA environments, the system complies with core principles outlined in IEC 60404-5 and ASTM A977/A977M for pulsed-field magnetic property measurement.

Key Features

• True coercivity measurement: Delivers experimentally resolved HcJ and HcB values without interpolation or correction assumptions.
• Finished-part compatibility: Measures as-manufactured components—including motor rotors, segmented arc magnets, and bonded assemblies—without sectioning, polishing, or dimensional standardization.
• Four-quadrant hysteresis acquisition: Captures complete B(H) loops including second- and third-quadrant recoil behavior critical for permanent magnet design validation.
• Modular coil system: Interchangeable probe heads (standard 50 mm bore; optional 80 mm/120 mm variants) enable scalability from lab-scale samples to industrial subassemblies.
• Thermal control integration: Integrated heating stage (20–180 °C) supports temperature-dependent coercivity profiling per IEC 60404-14.
• Real-time geometric compensation: Proprietary signal processing corrects for demagnetizing fields based on user-input sample geometry (length/diameter ratio, aspect, symmetry).
• Expandable energy architecture: Base 28 kJ capacitor bank supports upgrade to 50+ kJ for >12 T operation with large-bore coils.

Sample Compatibility & Compliance

The HyMPulse accepts specimens of arbitrary geometry—irregular shapes, multi-pole assemblies, thin films on substrates, and anisotropic sintered blocks—without requiring machining into standardized rods or toroids. This capability aligns with ISO/IEC 17025 requirements for method validation under non-ideal sample conditions. The system’s traceable calibration protocol follows NIST-traceable fluxmetric standards, and its data output format conforms to ASTM E29 and ISO/IEC 17025 documentation requirements for audit-ready reporting. All software-generated reports include full metadata: pulse waveform parameters (rise time, peak field, decay profile), thermal stabilization logs, and uncertainty budgets per GUM (Guide to the Expression of Uncertainty in Measurement).

Software & Data Management

The Windows-based HyMPulse Control Suite provides deterministic real-time acquisition, automated parameter extraction (Br, HcB, HcJ, Hknee, (BH)_max, H_max), and export to CSV, HDF5, or XML formats compatible with MATLAB, Python (Pandas/NumPy), and LIMS platforms. Audit trail functionality records operator ID, session timestamp, instrument configuration, and raw voltage/time series for each measurement—meeting FDA 21 CFR Part 11 and EU Annex 11 requirements for electronic records in regulated environments. Batch processing mode enables unattended multi-sample runs with configurable pass/fail thresholds against specification limits (e.g., HcJ ≥ 1200 kA/m ± 3%).

Applications

• Qualification of sintered NdFeB grades for EV traction motors and wind turbine generators.
• In-process verification of heat treatment efficacy in SmCo magnet aging cycles.
• Failure analysis of demagnetized rotor segments under thermal overstress conditions.
• Development of grain-boundary diffusion-processed magnets with gradient coercivity profiles.
• Calibration reference for secondary magnetometers (e.g., permeameters, Hall-effect mappers).
• Support of DOE-compliant rare-earth reduction initiatives via quantitative HcJ vs. Dy/Tb content correlation.

FAQ

Can the HyMPulse measure magnets embedded in metallic housings or laminated stacks?
Yes—its high-slew-rate pulse excitation and differential pickup coil design suppress eddy-current interference from conductive enclosures, enabling valid measurements on fully assembled stators and rotor cores.
Is temperature control available during pulsing?
The heating stage maintains stable setpoint temperature before and after pulsing; rapid thermal transients during the ~100 µs pulse are negligible due to thermal mass dominance and are compensated in post-processing.
How is calibration traceability maintained?
Each system ships with a NIST-traceable calibration certificate for both field amplitude (via Rogowski coil + oscilloscope) and flux linkage (using calibrated search coils and integrator), updated annually per ISO/IEC 17025.
Does the software support custom parameter definitions?
Yes—the formula editor allows users to define derived metrics (e.g., squareness ratio, irreversible flux loss %) and embed them directly into report templates and pass/fail logic.
What safety certifications apply?
The system meets CE marking requirements under the Machinery Directive 2006/42/EC and Low Voltage Directive 2014/35/EU, with integrated interlocks, emergency discharge circuitry, and magnetic field containment per ICNIRP 2010 exposure guidelines.