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为了解决传统霍尔测速准确性和快速性相互制约的问题,以实现空间用飞轮转速的快速准确测量;分析了霍尔测速误差产生的主要原因,提出了一种改进的周期测速法(T测速法),并给出了基于现场可编程门阵列(FPGA芯片)和硬件描述语言(VHDL)的实现办法;实验表明在同等精度的条件下,该方法速度反馈时间为传统方法的1/18,相对误差优于0.01%,实现了飞轮转速的快速准确测量.“,”To considerate to the accuracy and rapidity in speed measurement system using hall sensor, an improved method was proposed based on the analysis of the errors. This paper designed the implementation method based on FPGA devices and VHDL language for the new method. Experiment results showed that in the improved system relative error is in 0.01 percent, and the speed value feedback rate is increased by about 18 times under the equivalent precision. This method is simple, fast and accurate.