What are the core advantages of hollow shaft magnetic powder brakes?

Hollow Shaft Magnetic Powder Brake is a precision tension control component. Its core feature is a through hollow shaft in the middle, allowing the transmission shaft to pass directly through without the need for a coupling. It generates controllable braking torque by means of magnetic powder and electromagnetic excitation, and is widely used for constant tension control in winding and unwinding processes.

Hollow Shaft Magnetic Powder Brake

Let’s talk about the core advantages of hollow shaft magnetic powder brakes.

1. Easy installation and space saving

The transmission shaft runs directly through the hollow bore, eliminating couplings and bearing seats. The overall structure is compact and shortens the total equipment length, suitable for small rewinding machines, film blowing machines and wire extrusion machines.

2. High torque-current linearity and stable tension

Torque corresponds linearly to excitation current (non-linearity ≤±3%). The slip speed does not affect output torque. Tension remains stable despite changes in material thickness and running speed, avoiding stretching and wrinkling of finished products.

3. Fast response speed

Excitation response ≤20ms. It delivers sensitive performance during start-stop, speed regulation and tension switching, suited for high-speed slitting and CNC web production lines.

4. Excellent heat dissipation

Cold air or cooling water can flow through the hollow inner wall together with outer cooling fins, providing large heat capacity. It resists high temperature and magnetic powder agglomeration during long continuous slip operation for longer service life.

5. Smooth operation without impact and low noise

No mechanical friction engagement. Smooth start and stop without shock or vibration, ideal for easily damaged materials such as film, paper and aluminum foil.

6. Compatible with automatic closed-loop control

Matched with tension sensors and PLC / tension controllers, it automatically adjusts current to realize fully automatic constant tension. It can connect with servo presses and CNC winding equipment to form complete production lines.

7. Wide specification coverage

Torque ranges from 0.6Nm to 400Nm, with inner bore sizes from Φ15 to Φ80mm. It can be applied to thin wire machines, plastic blown film winders, metal foil slitting machines and other equipment of different sizes.