Products Description

HM-150TD Helmholtz-Maxwell Gradient Magnetic Field Generator

1. Overview

Gradient magnetic fields have been widely applied in many fields such as magnetic prospecting, magnetic flaw detection, archaeological excavation, shipwreck detection, biomagnetism, military research, and human body magnetic field measurement. Experimental research in engineering often relies on such fields. Gradient magnetic field coils are indispensable for calibrating gradient magnetometers or for conducting scientific and engineering experimental studies.

As is well known, the Earth itself is a large magnet that generates a non-uniform magnetic field, varying in magnitude and direction with location. The presence of underground ore deposits or other ferromagnetic objects can cause local magnetic field distortions. The human body possesses a magnetic field, which varies in strength across different regions and changes with the state of meridians, as well as with cardiac and cerebral activity. Magnetocardiograms and magnetoencephalograms play a crucial role in studying physiological activities and pathologies, making this one of the most active areas in biomagnetism today. In military science, studying the behavior of projectiles in gradient magnetic fields can yield valuable information. All these applications involve the establishment and measurement of gradient magnetic fields.

Methods for generating magnetic field gradients fall into two categories. One involves selecting an area with stable geomagnetic conditions and placing iron blocks along a measurement line to create magnetic anomalies for gradient testing. This method requires a relatively large testing space, and areas with stable geomagnetic conditions are not easily found. The other method uses energized coils to generate magnetic field gradients. This approach requires less space and offers flexible testing; however, the magnetic field gradient is influenced by factors such as coil shape, distance, and current, necessitating careful design. Magnetic field gradients are typically designed using methods based on anti-Helmholtz coils or gradient Maxwell coils.

The magnetic field generated by gradient Maxwell coils is formed by the vector superposition of two non-linear magnetic fields. Starting from the analytical solution of the gradient Maxwell coils, numerical simulation is used to model their magnetic field distribution, making the solution form intuitive and visual. This process yields the magnetic field intensity distribution, magnetic field gradient distribution, and contour maps on the xoy plane, enabling the design of gradient Maxwell coils with specific gradient values. Compared to the magnetic field gradient produced by anti-Helmholtz coils, under identical conditions of coil turns, excitation current, and coil radius, gradient Maxwell coils provide a larger uniform region of magnetic field gradient and offer superior gradient uniformity.

2. Main Technical Parameters

2.1 Helmholtz Coils

Operating Current: 0–140 A

Operating Voltage: 0–100 V

Power: < 14 kW

Helmholtz Coil Inner Diameter: 290 mm (Customizable)

Helmholtz Coil Magnetic Field: 1200 Gs (Customizable)

Cooling Method: Forced water cooling

2.2 Maxwell Gradient Coils

Operating Current: 0–160 A

Operating Voltage: 10 V

Power: 2 kVA

Gradient Coil Inner Diameter: 150 mm (Customizable)

Gradient Magnetic Field: 0–3 T/m (Customizable)

Cooling Method: Forced water cooling

Overall Specifications

Dimensions (L×W×H): 1000 mm × 720 mm × 720 mm

Weight: 400 kg