The compound excited DC motor stator pole and field winding addition to, but also equipped with a rotor winding in series with series winding (which turns less). Same series winding direction of the magnetic flux generated in the magnetic flux of the primary winding, starting torque around about four times the rated torque, short time overload torque is about 3.5 times the rated torque. Speed ??variation rate of 25% to 30% (related to the series winding). Speed ??can be adjusted by weakening the magnetic field strength. DC motor excitation mode refers to the field winding of how power generating field magnetic flux situation and establish the main magnetic field problems. Depending on the mode of excitation motor applications, the DC motor can be divided into the following types. Field winding and the armature winding without coupling relationship between the motor manufacturers, and by other DC power supply to the field winding of the DC motor called him excited DC motor, wiring in Figure 1.23 (a) below. M diagram showing an electric motor, if the generator is represented by G. PMDC also be considered separately excited DC motor. Motor motor applications _ _ liter liter Rui Rui Electrical and Mechanical ventilation and air conditioning provided by the 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!