Product Features ●Exciting current and torque are linear relationship Magnetic powder clutches and brakes are based on electromagnetic principles and use magnetic powder to transmit torque, and the torque transmitted is basically linear with the excitation current. Therefore, as long as the size of the exciting current is changed, the size of the torque can be easily controlled. Under normal circumstances, within the range of 5% to 100% of the rated torque, the excitation current is proportional to the torque transmitted linearly. ●Stable slip torque. When the excitation current remains unchanged, the transmitted torque is not affected. The influence of the differential speed (slip speed) between the transmission part and the driven part, that is, there is no difference between the static torque and the dynamic torque.

Therefore, a constant torque can be transmitted stably. If this feature is applied to tension control, the user only needs to adjust the size of the excitation current to accurately control and transmit the required torque, so as to easily and effectively achieve the purpose of controlling the tension of the coil, as shown in Figure B. ■Application range Due to the above characteristics of magnetic powder clutches and brakes, they have been widely used in unwinding and winding tension control in papermaking, printing, plastics, rubber, textiles, printing and dyeing, wire and cable, metallurgy and other related coiling processing industries. . In addition, the magnetic powder clutch can also be used for buffer starting, overload protection, speed regulation, etc. Magnetic powder brakes are often used for dynamometer loading and braking of transmission machinery. ■Type selection ●The selection of magnetic powder clutches and brakes is generally based on the maximum torque required to be transmitted. At the same time, attention should be paid to ensure that the actual slip power is less than the allowable slip power of magnetic powder clutches and brakes. 

The calculation formula is as follows: Actual slip power P=2×3.14×M×n/60=F·V (unit: W) where: M ----- actual working torque (N·m) F --- - Tension (N) n ----- Slip speed (r/min) V ----- Linear speed (m/s) ●The maximum tension required to wind the material without a speed change mechanism The product of the maximum winding radius should be less than the rated torque of the magnetic powder brake. In addition, the choice of magnetic powder clutch is also related to its position: on the premise of matching slip power, if the clutch is placed in the high-speed stage, a smaller size clutch can be selected, and its volume and cost will be reduced accordingly. When a small clutch cannot be matched and a larger clutch is required, it should be placed in the middle or rear of the transmission mechanism to increase the working torque and reduce the slip speed. ●When the heat dissipation conditions of magnetic powder clutches and brakes are constant, their slip power is a certain value, so their actual working torque and speed can compensate each other, that is, when the slip speed increases, the allowable torque will decrease accordingly, but the maximum speed It must not be higher than its permitted speed. Example: FZ100 magnetic powder brake, its rated torque M=100N.m, slip power P=7KW, then rated speed n=9550*P/M=9550*7/100=668.5r/min if actual slip speed n= 1500r/min (where 9550 is a constant coefficient), the allowable torque should be M=9550*P/n=9550*7/1500=44.6Nm (where: 9550 is a constant coefficient)