What are the core key performance indicators of magnetic powder clutches?

A magnetic powder clutch is an automatic control component that transmits torque utilizing electromagnetic principles and magnetic powder. It is mainly used in occasions requiring precise tension control, such as printing, packaging and wire and cable production.

Its working principle is that the magnetic field generated by the electromagnetic coil magnetizes the magnetic powder to form magnetic powder chains, so as to transmit torque between the input and output components.

Today we will mainly talk about the core key performance indicators of magnetic powder clutches.

1. Rated Torque

Unit: N·m, covering the full range of 0.1~500N·m; the torque linearity is good within the current range of 5%~100%, and the torque deviation of high-quality products is ≤±5%.

2. Excitation Current

Standard power supply of conventional DC24V, rated current 0.3~3A. Small current controls large torque, and it is easy to be matched with tension controllers.

3. Slip Power

It refers to the thermal load during long-term slipping operation and determines the continuous operation capacity. Formula: Slip Power P=9550×T÷n, T = torque, n = slip rotational speed. Insufficient slip power will cause overheating, demagnetization and torque attenuation.

4. Response Time

Torque rise/fall time ≤50ms. Millisecond-level rapid adjustment, suitable for frequent start-stop and constant tension control.

5. Residual Torque

Residual dragging force after power failure. For high-quality products, it is less than 1% of the rated torque with complete separation and no material dragging. Inferior products have large residual torque, which will cause tensile deformation of materials when stopping.

6. Allowable High Rotational Speed

Limited by bearings and the centrifugal force of magnetic powder. Water-cooled models of larger specifications are required under high-speed working conditions.

7. Service Life

8000–15000 working hours under normal operating conditions. Magnetic powder needs to be replaced for maintenance after abrasion or agglomeration.