PWM mode was analyzed, and a kind of variable-resistance timing Winch being of simple structure and large power supply was put forward by using wire-wound motor and series resistance timing principle.
Besides there is also some alternatives such as an inductance conversion using differential transformer and space curve deformeter and variableresistance pressure transmitter.
除此之外还有利用差动变压器和扰曲线应变计的电感变换方式，以及变电阻式压力变送器。
3
The paper introduces the working principle, constitution and application of a new type liquid variableresistance starter of high power motor used in coal mine.