Series-wound DC motor field winding and the rotor winding through the brush and commutator series excitation current and the armature current is proportional to the stator flux with increasing excitation current increases, the torque and power approximation motor armature current price proportional to the square, with increasing speed torque or current decreases rapidly. DC motor shunt field winding and rotor windings in parallel motor model, which describes the excitation current relatively constant motor starting torque and the armature current is proportional to the starting current of about 2.5 times the rated current. With increasing speed of the current and torque decreased slightly, short-term overload torque 1.5 times the rated torque. Speed ??the rate of change is small, 5% to 15%. Speed ??may be weakened by the magnetic field of constant power. Motor brand, motors, electrical and mechanical lift provided by the lift 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!