The magnetic Particle brakes represents a new type of transmission and braking device. It relies on electromagnetic principles and uses magnetic particles as the working medium. By forming magnetic particle chains under an applied current, it achieves precise torque transmission and braking functions.
Compared with conventional braking systems, this technology offers flexibility, responsiveness, and clean operation, making it widely used in automation, packaging, printing, and textile industries.
Magnetic Particle Brakes : Structural Composition
A magnetic particle brake typically consists of four main parts:
- Inner Rotor – Responsible for rotation and torque transfer.
- Outer Rotor – Connected with the load to transmit or resist motion.
- Excitation Coil – Generates a magnetic field when energized.
- Magnetic Particles – Serve as the medium to connect both rotors.
This simple yet effective design ensures stable performance and long-term reliability.
Working Principle
When the excitation coil remains unpowered, the active rotor rotates freely. Centrifugal force pushes the magnetic particles against the inner wall of the rotor. At this stage, no torque transfers to the driven rotor, so it runs idle.
Once DC current energizes the coil, an electromagnetic field forms. The magnetic particles align along the lines of magnetic force, creating chains that bridge the inner and outer rotors. As a result, torque smoothly transfers, and the brake begins to function effectively.
Operators can adjust the transmitted torque by changing the excitation current. The relationship between current and torque is direct and linear, allowing precise and convenient control.
Precautions For The Use Of Magnetic Particle Brakes
To guarantee stable performance and long service life, users should observe the following precautions:
Temperature Control
- Keep the surface temperature below 80°C for standard brakes.
- Limit water-cooled brakes to 90°C.
- Ensure forced air-cooled brakes remain under 60°C.
Initial Activation
- Before first use, apply 30% of rated current, run for 10 seconds, and power off. Repeat this several times to ensure smooth particle flow and even distribution.
Avoid Overload
- Do not operate at excessive torque or speed. Overloading accelerates particle wear, causes leakage, or leads to jamming.
Moisture and Oil Protection
- Prevent water or oil from entering the brake. When installed in gearboxes, always use complete sealing films to block oil penetration through shafts.
Conclusion
Magnetic particle brakes combine precise torque control, rapid responsiveness, and clean operation. Their structural simplicity and reliability reduce maintenance costs, while their versatility supports a wide range of industrial applications.
However, to maximize their benefits, users must carefully control temperature, avoid overload, and protect the interior from moisture or oil. With proper operation and maintenance, magnetic particle brakes deliver long-lasting performance, energy savings, and stable production efficiency.