Structure and Working Principle

The magnetic powder clutch is composed of active rotor(input shaft), driven rotor(output shaft) and Yoke with excitation coil. The three parts are assembled relative concentric and form a system which can rotate relatively. The annular gap between active rotor and driven rotor is full of alloy powder which has high magnetic conductivity.

The magnetic powder will be in the state of loose when the current do not pass the excitation coil. The magnetic powder will be thrown on the inner wall of active rotor. In this case, there will not exist the interaction force between the active and driven rotor. So the magnetic powder clutch is in the state of separation, no torque transmission exits.

The magnetic powder in the working chamber will link in a link state under the action of magnetic flux generated from the Yoke when the current pass the excitation coil. The magnetic powder clutch can transfer torque relying on the shear force generated from magnetic chain and the friction generated from the magnetic powder and working face. In this case, the magnetic powder clutch is in the state of combination.

When the current is cut off, the magnetic flux will disappear with the disappearance of magnetic current,the magnetic powder will be in the state of loose under the action of gravity again, and will be thrown on the inner wall of active rotor under the action of the centrifugal force. In this case, the magnetic powder clutch will be in the state of separation again.

磁粉离合器是由主动转子（输入轴）、从动转子（输出轴）、含激磁线圈的磁轭组成，三部分相对同心装配，形成了一个可以相对转动的整体，在主动转子和从动转子之间的环形空隙（工作腔）内填有高导磁性的合金磁粉。

激磁线圈无电流通过时，工作腔中的磁粉呈松散状态。在主动转子所产生的离心力作用下，磁粉被均匀地甩在主动转子的内壁上，主、从动转子只见无力的相互作用，磁粉离合器处于分离状态，没有转矩的传递。

激磁线圈有电流通过时，磁轭中产生工作磁通，工作腔中的磁粉沿磁通方向呈链状连接起来（形成磁粉链），磁粉离合器就是靠此时磁粉与磁粉、磁粉与工作面之间的摩擦力和磁粉链之间的抗剪力来传递转矩，磁粉离合器处于结合状态。（见图1）

切断电流时，磁通随激磁电流的消失而消失，磁粉在重力的作用下又重新处于松散状态，并在离心力的作用下，被甩在主动转子的内壁上，磁粉离合器又处于分离状态。

磁粉制动器与磁粉离合器的原理相同，只要磁粉离合器的从动转子加以固定，就形成了磁粉制动器。

Application应用范围

Due to the features of the magnetic powder clutch and brake, they have been widely used in paper making, printing, plastic items, rubber industry, textile industry, printing and dyeing,wire and cable, metallurgy industry and tension control of winding and winding in roll material processing industry.

由于磁粉离合器/制动器具有以上特性，现已广泛应用于造纸、印刷、塑料、橡胶、纺织、印染、电线电缆、冶金以及其他相关卷取加工行业中收卷和放卷张力的控制。下面是一套较为完整的张力控制系统示意图。

Moreover, the magnetic powder clutch can be also used in buffering start, overload protection, speed adjustment. Magnetic powder brake can also be used in test loading and braking of the transmission machinery.

另外：磁粉离合器还可以用于缓冲启动、过载保护、调速等；磁粉制动器还可以用于传动机械的测试加载、制动等。