本文利用磁粉制动器输出转矩与激磁电流成线性这一特性来实现对张力的恒值控制。

This thesis uses the linearity relation of output torque and excitation current to control the tension.

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采用(PWM)控制技术，恒流特性好，电流控制精确。

Apply PWM control technology, outstanding constant current property, precise current control.

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