Excited DC motor field winding connected to a separate excitation supply motor brand, which is also relatively constant excitation current, starting torque is proportional to the armature current. Speed ??change is 5% to 15%. It can weaken the magnetic field constant power to increase speed or by reducing the voltage of the rotor windings to reduce the rotational speed. Commutator commutator segments using silver, copper, cadmium and copper alloy motor investment, high-strength molded plastic. Brush sliding contact with the commutator motor, provides the armature current rotor windings. Brushless DC motor electromagnetic commonly used metal-graphite brushes or electric graphite brush. Rotor core is made using silicon layers, usually 12 slots, built-in 12 groups of the armature winding, after series connection between the windings, then respectively 12 commutator segments connection. Motor Image, 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!