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引言当今的调速系统大都采用速度反馈控制,双闭环系统也不例外。而要速度反馈,测速机是不可缺少的。可是测速机除了增加费用外还带来一系列其它问题。首先是可靠性,直流机系统故障的50％是整流子、炭刷造成的,而直流测速机将使故障率更高,其次是维修工作量大,再有是安装不好带来的低频纹波干扰影响调速系统低速性能,加之受到测速机精度和线性度限制,限制了调速系统精度的提高。随着微电子学、功率电子学的迅速发展,随着微机性能不断提高和价格不断下降,给调
Introduction Today’s speed control systems mostly use speed feedback control, double closed-loop system is no exception. Speed feedback, speed measuring machine is indispensable. However, in addition to additional costs tachometer also brought a series of other problems. The first is reliability, 50% of DC system failure is caused by the commutator, carbon brush, and DC speedometer will make the failure rate higher, followed by the maintenance workload, and then there is a low-frequency installation is not good Wave interference affects the low-speed performance of the speed control system, coupled with the accuracy and linearity of the speed limiter, which limits the accuracy of the speed control system. With the rapid development of microelectronics and power electronics, with the continuous improvement of microcomputer performance and the continuous decrease of price,