Metis CDM-M Capacitive Discharge Magnetizing System

Overview

The Metis CDM-M Capacitive Discharge Magnetizing System is an industrial-grade, high-energy pulse magnetizer engineered for precise, repeatable magnetization and demagnetization of permanent magnetic materials. Based on the principle of controlled capacitor discharge through a low-inductance magnetizing coil, the system delivers short-duration, high-amplitude current pulses—typically sub-millisecond in width—to generate intense transient magnetic fields exceeding several tesla. This physics-based approach ensures deterministic alignment of magnetic domains in hard magnetic materials such as sintered NdFeB, SmCo, AlNiCo, and ferrites. Unlike continuous-field electromagnets, the CDM-M leverages energy storage in high-voltage capacitor banks, enabling peak currents up to 50 kA in custom configurations while maintaining exceptional pulse-to-pulse reproducibility (<±0.5% energy variation under stable thermal conditions). Its design targets production environments where throughput, field uniformity, and process traceability are critical—particularly in automotive sensor manufacturing, electric motor stator/rotor assembly, and precision actuator component finishing.

Key Features

• Modular capacitive energy architecture: Standard configuration delivers 4 kJ nominal energy, scalable via parallel insertion of 4 kJ modular blocks to exceed 100 kJ total stored energy.
• Programmable high-voltage power supply: Adjustable charging voltage up to 3 kV enables fine-tuned control over pulse amplitude and magnetic field strength.
• Digital pulse control system: Integrated microprocessor-based controller with RS232 serial interface supports external PLC synchronization, recipe-based operation, and real-time pulse parameter logging (voltage, current, time).
• Robust industrial enclosure: IP54-rated cabinet with forced-air cooling; optional liquid-cooled variants available for high-cycle-rate applications.
• Low-inductance coil interface: Standardized coaxial busbar connections accommodate user-supplied or Metis-engineered magnetizing fixtures—including multi-pole, radial, axial, and Halbach array configurations.
• Compliance-ready architecture: Designed to meet IEC 61000-4-2 (ESD), -4-4 (EFT), and -4-5 (surge) immunity requirements; safety interlocks conform to ISO 13857 and EN 60204-1.

Sample Compatibility & Compliance

The CDM-M accommodates a broad spectrum of magnetic materials and geometries, including isotropic and anisotropic sintered NdFeB (H_cj up to 32 kOe), SmCo (grades 1:5 and 2:17), bonded NdFeB, ferrite tiles, and AlNiCo alloys. It supports both single-shot and sequential multi-pole magnetization of rotors, stators, encoder rings, and linear actuators. Fixture design follows ASTM A977/A977M guidelines for magnetic property measurement consistency. For regulated industries—including medical device component suppliers and automotive Tier-1 manufacturers—the system supports audit-ready operation when paired with validated software (e.g., Metis MagControl Suite) that provides full 21 CFR Part 11-compliant electronic records, user access controls, and immutable audit trails.

Software & Data Management

The CDM-M operates with Metis MagControl firmware, accessible via local HMI or remote terminal emulation. All pulse parameters—including charge voltage, trigger delay, coil identification, operator ID, and timestamp—are logged to non-volatile memory with UTC synchronization. Optional Ethernet gateway enables integration into MES/SCADA systems using Modbus TCP or OPC UA protocols. Data export formats include CSV and XML, compatible with statistical process control (SPC) platforms such as Minitab or JMP. Firmware updates follow ISO/IEC 17025-aligned change control procedures, with version history and calibration certificate linkage maintained per unit.

Applications

• Magnetization of multipole rotor assemblies for BLDC motors used in EV traction drives and HVAC compressors.
• Radial magnetization of ring magnets for brushless DC position sensors meeting AEC-Q200 stress test requirements.
• Demagnetization of tooling and fixtures prior to precision machining of magnetic components.
• Research-scale magnetization studies of novel rare-earth-free permanent magnet candidates under pulsed-field conditions.
• Production-line validation of coercivity stability after thermal aging or mechanical shock exposure.

FAQ

What is the typical pulse duration and rise time for the CDM-M system?

Pulse width ranges from 0.1 ms to 2 ms depending on coil inductance and selected energy level; typical 10–90% current rise time is <100 µs with low-inductance fixtures.
Can the CDM-M be integrated into a robotic cell with PLC-level coordination?

Yes—RS232 and optional digital I/O modules support hardware-triggered firing, status feedback, and fault signaling synchronized to PLC scan cycles.
Does Metis provide coil design support for custom magnetization patterns?

Yes—Metis offers finite-element modeling (FEM) services using ANSYS Maxwell to simulate field distribution, saturation margins, and thermal loading for customer-specific fixtures.
Is the system suitable for magnetizing temperature-sensitive components?

The ultra-short pulse duration minimizes resistive heating in both coil and workpiece; thermal rise in typical NdFeB parts remains below 5°C per shot under standard duty cycles.
How is calibration and traceability maintained across production shifts?

Each system ships with NIST-traceable voltage and current transducer calibration certificates; daily verification routines are programmable within MagControl firmware and logged with digital signatures.