The inaccurate measurement of initial position of motor rotor when the motor starts is a problem existing in a servo system applying increment photo-electricity pulse coder.
使用增量式光电编码器测量电机位置的伺服系统中，在电机启动时，普遍存在无法准确测量出电机转轴初始位置的问题。
The Improved M/T method with 80C552 and a photo- electricity coder to measure electro-motor' s rotation speed can achieve a large scale of rotation speed measuring precision.
用80C552单片机和光电码盘配合改进的M/T法，检测铸轧辊的执行电机转速可获得大范围内测速精度。
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