How to differentiate between weak magnetic control and strong magnetic control?

The so-called weak magnetism control and strong magnetism control refers to the control by the excitation current of the motor or generator. "Weak magnetism" means that the excitation current is less than the rated excitation current; "strong magnetism" means that the excitation current is larger than the rated excitation current.

Strong magnetic control, also known as strong excitation control, is mainly used in generator short circuit protection or undervoltage protection. When the generator terminal voltage is close to 0 or drop too much, it is necessary to force the excitation, which can make the generator terminal voltage rise, the output current increases, triggering the protective device action trip, to realize the protection.

Weak magnetic control is mainly used for weak magnetic speed regulation of electric motors, generator weak magnetic control is mainly referred to by the DC generator - DC motor into the G-M dragging system, in order to get a soft or falling mechanical characteristics are used.