Electromagnetic DC motor stator pole (main pole) is composed of a core and a field winding. According to its excitation (the old standard called excitation) in different ways it can be divided into series-wound DC motor, shunt DC motor, separately excited DC motor and compound excited DC motor. Due to the different excitation mode motor model, the stator pole flux (generated by the stator poles after excitation coils) rule is different. Its starting torque of up to five times more than the rated torque motors offer, short-term overload torque up to more than 4 times the rated torque, speed variation rate is high, very high load speed (which is generally not allowed in the no-load running). By using the external resistor in series with the series winding (or parallel), or the series winding connected in parallel to achieve speed change. How much motor, motor, electromechanical absolutely authentic Swiss liter by liter Rui HVAC Electrical Equipment Factory. L Rui HVAC Electrical Equipment Factory (www.dzsrxfkt.com) strong, credible, Shandong Texas fan, ventilation equipment industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead the Swiss mechanical and electrical liter into the brilliant and you work for a better future!