Adopt gyral zero-finding technology to ensure the correction of detected part and avoid the。dislocation resulted from the stepout of direct drive.

采用回旋找零技，测试位置准无误，避免了因直接驱动失步而成错位。

Based on analyzing hydraulic stepout and heating power stepout took place in hot water heating system indoor, the improvement plan is presented in this paper.

分析了室内热水采暖几种系统中经常水力失调、热力失调问题，并提了相应对策意见。