DC motor shunt field winding and rotor windings are connected in parallel, the magnetizing current is relatively constant motor starting torque and the motor armature current is proportional to the application, about 2.5 times the rated current starting current is about. With increasing speed of the current and torque decreased slightly, short-term overload torque 1.5 times the rated torque. Motor rotation speed variation rate smaller species, from 5% to 15%. Speed ??may be weakened by the magnetic field of constant power. The compound excited DC motor stator pole and winding - except for outside electrical Usually, also equipped with (its less turns) and rotor winding in series series winding. 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. Electrical installation, electrical, mechanical and electrical liter by liter Rui 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!