Since HSY requires dcmagneticfield, an exciter with control circuitry is needed in addition to the conventional PMSY drive unit when employed as a motor.
HSY作为电动机使用时，由于需要直流磁场，与普通pmsy的驱动单元相比，应额外增加一个励磁电路。
2
The paper introduced some debugging problems and solving methods according to DC speed regulating system of reversible magneticfield and logical control without circular current.
针对磁场可逆的逻辑无环流直流调速系统，介绍了调试过程中出现的一些问题及处理方法。
3
MHD propulsion types are classified into the AC MHD propulsion and the DC MHD propulsion by supplied magneticfield.