Magnetizing and Demagnetizing Machines: Principles and Selection

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Magnetization Principle

The process of increasing the magnetism of non-magnetic or weakly magnetic materials is called "magnetization." After magnetization, the material acquires permanent magnetism.
By applying an external magnetic field that can overcome the intrinsic coercivity of the magnetic material, the material becomes magnetized. When this external magnetic field is removed, the magnetic material retains residual magnetism, thus completing the magnetization process.

Magnetization Principle

Magnetization is divided into saturated magnetization and unsaturated magnetization. Common magnetization methods typically use saturated magnetization, where the magnetic material will not demagnetize during normal use.
Saturated magnetization equipment is divided into two categories: "equipment that generates a high magnetic field" and "equipment that generates a high magnetic field instantaneously."

The representative equipment for the former is a "DC power supply/coil (static magnetic field method)."
The representative equipment for the latter is a "high-voltage oil-immersed capacitor type magnetization power supply (pulsed magnetic field method)."

Bipolar Magnetization: Using a Magnetizing Coil

A wire is wound into a cylindrical coil, and when current flows through the coil, a magnetic field is generated inside, magnetizing the magnetic material within.

However, a magnetizing coil can only produce magnetic fields in two directions: North and South poles. The direction of the magnetic field is determined by the direction of the current in the coil, and the magnetic field strength is determined by the magnitude of the current in the coil.
This magnetization method has strong compatibility; as long as the magnetic material can be placed inside and a sufficient magnetic field is generated within the magnetization range, saturation magnetization can be achieved.

Multipole Magnetization: Using a Multipole Magnetizing Fixture

A multipole magnetizing fixture involves winding wires on an iron core. The principle is the same as a magnetizing coil, but by changing the shape of the iron core and the winding method, the generated magnetic field can be controlled, allowing for multipole and complex magnetization of various shapes.

Magnetic components or product applications generally use multipole magnetization, which can solve various assembly problems, optimize production processes and quality, and control the magnetic field accuracy and requirements of the application product itself.

Magnetizing Fixture

Every magnetizing application requires a custom-designed magnetizing coil or fixture to convert the energy from the magnetizing power supply into the magnetic field needed for magnetization.

Magnetizing Fixture

The above are some common magnetization methods in the industry. If you have special magnetization requirements, our company can customize a solution for you.

For examples

DXME Series Magnetizing Source

The DXME series magnetizing power supply is a standard type of magnetizing power supply, featuring button-operated controls. It can be customized with specifications including magnetizing voltage from 50 to 6,000 V and capacitance from 200 to 1,000,000 F. Optional functions include demagnetization (D), multi-channel output (P), multiple discharge (V), ultra-low impedance (L), and fast charging and discharging capabilities.

Model	DXME-10C100	DXME-10C200	DXME- 10C400	DXME-25C20	DXME-25C30	DXME- 25C100	DXME- 25C200
Input power	220V 50～60Hz 30A		220V 50～60Hz 40A			220V 50～60Hz 60A
Charge voltage	50～1000V			50～2500V		50～2500V
Max. output current	15,000A			30,000A
Repeat precision of charge voltage	±1V
The capacity of condenser	10,000μF	20,000μF	40,000μF	2,000μF	3,000μF	10,000μF	20,000μF
Charge time	5S	9S	18S	5S	8S	18S	36S
Max. energy	5,000J	10,000J	20,000J	6,250J	9,375J	31,250J	62500J
Enclosure dimension (mm)	500W × 1000D × 1400H		1000 × 1000D × 1400H	500W × 1000D × 1400H		1000W × 1000D × 1400H	1500W × 1000D × 1400H
Weight	250Kg	350Kg	600Kg	300Kg	400Kg	600Kg	1000Kg
Documentation Manual	Chinese or English

DX-MAG Capacitive Pulse Magnetizer

DX-MAG series capacitive pulse magnetizing/demagnetizing machines are composed of high-voltage oil-immersed pulse capacitors, silicon controlled rectifiers and control circuits. The AC power increases the power supply voltage through the isolation transformer, and then is converted into DC by the rectifier to charge the capacitor. The high-voltage direct current energy is stored in the capacitor.

Model	DX-MAG-12C20	DX-MAG-12C30	DX-MAG-12C40
Input power	AC220±10%	AC380±10%	AC380±10%
Input current	40A	40A	40A
Charging voltage	DC200V-1200V	DC200V-1200V	DC200V-1200V
Capacitance capacity	2000uF	3000uF	4000uF
Store energy	1440J	2160J	2880J
Output current	15kA	15kA	15kA
Magnetization interval	1.0 seconds/time	1.5seconds/time	2.0 seconds/time

Model	DX-MAG-25C10	DX-MAG-25C15	DX-MAG-25C20
Input power	AC220±10%	AC380±10%	AC380±10%
Incoming current	40A	40A	40A
Charge Voltage	DC200V-2500V	DC200V-2500V	DC200V-2500V
Capacitance	1000uF	1600uF	2000uF
Stored energy	3125J	5000J	6250J
Output current	30kA	30kA	30kA
Magnetization interval	2.0 seconds/time	3.0seconds/time	3.0 seconds/time

Bonded Ferrite Magnetizing Machine

The DXMM30C10 magnetizing machine is custom-designed for magnetizing bonded ferrite (intrinsic coercivity 2800 Oe).

Features:

Output current measurement, directly output to a BNC connector, providing a plug-in quick-release output cable and a current measurement coil for detection.
The current output monitor has two BNC interfaces, one with a peak hold reset circuit and the other with direct output.
Three thyristor rectifiers, three trigger inputs, and three sets of output leads.
Real-time dynamic monitoring and control of output voltage. The desired output voltage value can be set via a potentiometer on the machine's control panel, with a setting accuracy of +/-1V. The magnetizing voltage is automatically compared with the set value and fed back for closed-loop control.
The door features a safety interlock design. Power can be switched off or on when the door is opened.

Bonded Ferrite Magnetizing Machine

DXMM30C10 Bonded Ferrite Magnetizing Machine

Conveyor Belt Demagnetizer

This solution is designed for magnetic tape materials and frequency characteristics, and can meet the demagnetization requirements for entire reels of tape. The demagnetizer uses a conveyor belt demagnetization mode.
It meets the customer's power supply requirements.
The demagnetizer is equipped with a power indicator light and a working indicator light.
It features synchronous conveying function, and the conveyor belt speed is adjustable.
Demagnetizer dimensions: 2500*780*1200mm.
It can be equipped with a tray for receiving materials at the end. (This is optional; please specify if this accessory is needed.) Transverse demagnetization is completed in one pass.

DXDM-2000 Solution of Automatic Magnetic Tape Demagnetizer

Capacitive Magnetizer

The DXMM-20C100 capacitive magnetizer is suitable for magnetizing permanent magnets, loudspeakers, DC motors, DC fans, stepper motors, rubber magnets, and magnetic toys.
It features a cabinet-style chassis structure and optimized circuit design. The energy storage capacitor is a high-voltage, oil-immersed, long-life power capacitor. Rigorous testing ensures powerful performance, extended service life, strict material selection, and excellent cost-effectiveness.
The output voltage is continuously adjustable, allowing for easy control of the magnetization field strength. It is suitable for various sizes and shapes of magnets, including ferrite, AlNiCo, rubber magnets, NdFeB, and rare earth permanent magnets, as well as internal and external magnetization of small and medium-sized motors and various specifications of loudspeakers.

It boasts excellent performance characteristics such as low energy consumption, high efficiency, and fast magnetization speed. We also provide various matching magnetization fixtures to meet users' requirements for additional demagnetization functions.