Torque Control of Magnetic fluid Coupling under Pulse Width Modulation

当磁场施加到液力偶合器上时，磁性流体移动到旋转盘的外部区域，并且通过盘和壳体之间的磁性流体的粘性摩擦传递扭矩。为了提高磁流体的快速和平稳的运动，狭缝切割在旋转盘。为了消除无磁场下的输出转矩，在壳体底部开一条磁流体通道。作为这些修改的结果，无论是否施加磁场，都获得了大的扭矩差。输出转矩的响应也得到了改善，无论是输入信号被打开或关闭。转矩传递的特性在磁流体联轴器还检查时，磁场是由脉冲宽度调制（PWM）和模糊控制使用。输出扭矩可以由PWM控制器控制，该PWM控制器确定到线圈的电流。结果表明，在模糊控制器的作用下，实现了转矩传递的可变控制。

Whenever a magnetic field is applied to a fluid coupling, the magnetic fluid shifts to the outer area of the rotating disk, and a torque is transmitted via the viscous friction of the magnetic fluid between disk and the case. In order to enhance rapid and smooth movement of the magnetic fluid, slits were cut in the rotating disk. A channel for magnetic fluid was cut at the bottom of a case to cancel the output torque under a non-magnetic field. As a result of these modifications, a large torque difference was obtained whether a magnetic field is applied or not. The response of the output torque was also improved whether the input signal is turned on or off.The characteristics of torque transmission in a magnetic fluid coupling is also examined when a magnetic field is ocntrolled by pulse width modulation (PWM) and a fuzzy control is used. The output torque can be controlled by the PWM controller that determines the current to the coil. It is confirmed that a variable control of torque transmission is obtained under the fuzzy controller.