Magnetic field generator DXHC series

electromagnetic fieldfield-strengthprogrammable

Helmholtz Coil is a device consisting of two (or more) matched coils arranged on a common axis to produce a highly uniform magnetic field in the central region. Dexinmag offers one-dimensional, two-dimensional and three-dimensional Helmholtz coil configurations, available as AC or DC field generators and in custom sizes and performances.

Applications:

• Generate a standard magnetic field for laboratory and industrial tests.
• Offset and compensate the Earth's magnetic field for experiments and sensors.
• Geomagnetic environment simulation and electromagnetic interference simulation experiments.
• Calibration of Hall probes and various magnetometers.
• Research on biomagnetic fields and magnetic properties of matter (magnetization, hysteresis, flux measurement).
• Control and study of microswimmers, magnetic nanoparticles and nanorobots under controlled magnetic fields.
• Magnetic confinement coils for plasma physics and fusion-related experiments (large custom coil designs available).
• Manufacture and testing of high-precision magnetic sensors.

Working principle:
When two identical circular coils are fed with current in the same direction and are separated by a specified distance, their fields superpose to form an almost uniform magnetic field near the mid-plane. By reversing currents the superposition can be used to generate a near-zero-field region (anti-Helmholtz). Dexinmag refers to the empirical relation B ≈ 0.9·μ0·I/R (for two coils of radius R separated by 2R) as a design guideline.

Product types / configurations (high-level):

• 1D (Uni-directional) Helmholtz Coil — single-axis coil for AC/DC uniform fields.
• 2D Helmholtz Coil — orthogonal pair(s) providing planar uniform fields.
• 3D / 3-axis Helmholtz Coil — three mutually orthogonal coil pairs for full 3D field control (including rotating and gradient fields).
• Equal-diameter 3D Helmholtz Coil — three coils with equal diameter and turn counts for compact uniform volume.
• Square Helmholtz Coil — large uniform regions with square frames for large specimens (side lengths up to meters).
• High-uniformity combined (Barker-style) Helmholtz Coil — compensated coil designs to expand and improve the homogeneous region.
• Gradient magnetic field coils, no-magnetic-moment coils and power-frequency (AC) Helmholtz coils (customizable field strength / uniformity).

Representative parameters / examples (excerpt from Dexinmag table):

• DXHC30-50 — radius 300 mm; center field ≈ 50 Gs; uniformity ~5%; homogeneous sphere diameter ~200 mm; typical power ~420 W; 1D weight ≈ 55 kg.
• DXHC30-10 — radius 300 mm; center field ≈ 10 Gs; uniformity ~0.5%; homogeneous sphere diameter ~100 mm; typical power ~90–120 W; 1D weight ≈ 12 kg.
• DXHC30-2 — radius 300 mm; center field ≈ 2 Gs; uniformity ~0.05–0.01%; homogeneous sphere diameter ~60–40 mm; typical power ~18–32 W; 1D weight ≈ 3.5 kg.
• DXHC25-1000 — radius 250 mm; center field ≈ 1000 Gs; uniformity ~5%; homogeneous sphere diameter ~160 mm; typical power ~5000 W; 1D weight ≈ 500 kg.
• DXHC25-500 — radius 250 mm; center field ≈ 500 Gs; uniformity ~0.5%; homogeneous sphere diameter ~100 mm; typical power ~2500 W; 1D weight ≈ 250 kg.
• DXHC20-500 / DXHC20-300 / DXHC20-100 — examples with radius 200 mm offering center fields 500/300/100 Gs respectively (uniformity and power scale per model).
• Smaller-model examples (DXHC15, DXHC10, DXHC7 series) — radii 150–70 mm with center fields from a few Gs up to hundreds of Gs depending on model; suitable for compact setups and benchtop experiments.

Key features and design notes:

• Available as AC and DC designs; can produce uniform strong fields, gradients and rotating magnetic fields (Dexinmag systems support closed-loop control in selected ranges, e.g., 0–20 Hz and 0–200 Gs for some 3D systems).
• Frames and supports are non-magnetic when required; coil radius is recommended at least ~2.5× the largest specimen to ensure the specimen fits inside the homogeneous region.
• Standard connectors: Amphenol / aviation sockets, binding posts, banana sockets etc.; multi-axis coils have separate connectors/drive channels (e.g., 3-axis units typically have three connectors and independent supplies).
• Custom designs and on-site installation/testing are available; Dexinmag produces a wide range of standard models (DXHCxx-yy) and custom assemblies for special applications.

Caractéristiques / spécifications techniques:

• Manufacturer / brand: Dexinmag (Xiamen Dexing Magnet Tech. Co., Ltd.).
• Denomination / series: DXHC series (multiple DXHC models e.g., DXHC30-50, DXHC25-1000, DXHC20-500, DXHC15-50, DXHC10-200, DXHC7-100).
• Function: generate uniform magnetic fields (AC / DC), gradient fields and rotating fields; calibrate magnetometers; simulate geomagnetic and EMI environments; drive magnetic microswimmers / particles.
• Available center field range: from a few Gs up to 1000+ Gs depending on model (see model table examples).
• Typical coil radii: commonly 70 mm up to 300 mm (and custom larger sizes for large-sample or installation projects).
• Uniformity: model-dependent (examples range from sub-percent levels to several percent depending on design and homogeneity compensation).
• Power range: from a few watts (small models) to several kilowatts (large / high-field models) — model dependent.
• Weight: model-dependent (examples range from a few kg for small coils to several hundred kg for large high-field units).
• Options: single-axis, two-axis, three-axis, equal-diameter 3D, square frames, high-uniformity (Barker) combined coils, gradient coils, no-magnetic-moment coil configurations.