Mike Krzyzewski is really a famous coach of Dream Team. She has coached north america men's basketball team for some time, that's clinched numerous medals for his country. Following Londonfl jerseys supplyn Olympic was over, Krzyzewski told The Associated Press that this game will be his final one as national coach, a job he's held for seven years. He had left open the possibility of swomen nfl jerseystaying with the team beyond the London Games, when practice on Saturday said these will be his last Olympics.When asked if he was sure, Krzyzewski didn't hesitate before again saying, "yecheap nfl jerseys wholesales," this will be his last game "If we could win it, then it might be three major championships in a row, i always do not know when that has been done because we haven't usually won http://govoriotkrito.bg/libs/nflcn08.htmthe globe championships," Krzyzewski said. "It becomes an enormous thing for the program." Whatever, he's an awesome coach. His achievement are going to be remembered by the country.cheap nfl jerseys
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JD2A电磁调速电机控制器工作原理

2014-3-24 9:22:15      点击:

JD2A电磁调速电机控制器工作原理 JD1、JD2系列电磁调速电动机控制器是由速度调节器、移相触发器、可控硅整流电路及负反馈等环节所组成。JD1A与JD2A原理相同,速度指令信号电压和速度负反馈信号电压比较后,其差值信号被送入速度调节器进行放大。放大后的信号电压与锯齿波叠加,控制了晶体管GB1的导通时刻,随着差值信号电压改变移动脉冲,从而控制了可控硅的开放角,使滑差离合器的激磁电流随着变化,即滑差离合器的转速随着激磁电流的改变而改变。