The working principle of contactor

(a) as shown in figure l shape and structure diagram for ac contactor.Ac contactor is made up of four parts:(1) the electromagnetic mechanism electromagnetic institutions by the coil (armature) and static and dynamic core acmotor2.blogspot.com core component,its role is converting electromagnetic energy into mechanical energy,electromagnetic suction contact action.(2) the contact system Including the main contact and auxiliary contact.Main contact for on and off the main circuit,usually for three to normally open contacts.Auxiliary contact is used to control electric circuit,the electric interlocking effect,so it is also called interlocking contacts,normally open,normally closed two of each.(3) arc generator stator extinguishing device capacity has more than 10 a contactor in arc extinguishing device,for small capacity of contactor,often with double fracture contact arc extinguishing arc plate,electric arcing,alternate with arc and clay arcing cover arcing.For large capacity contactor,adopt longitudinal seam arcing cover and grid arcing.

(4) other parts including reaction spring,buffer spring,spring contact pressure,transmission mechanism and shell,etc.1 a arcing cover 2 a contact pressure spring 3 and 4 main contact a reaction a coil spring 5 6 a short circuit ring 7 8 a spring 9 move www.dongfeng-motor.com a static core core 10 a auxiliary normally open contact 11 a auxiliary normally closed contact of the working principle of electromagnetic contactor is as follows:after the coil current,flux and electromagnetic suction in core.The electromagnetic suction makes the armature and overcome the spring force,drive the contact agency action,open normally closed contact,normally open contact closure,interlock or connection.Coil loss of electricity or on both ends of the coil voltage decreased significantly,the electromagnetic force is less than the spring force,makes the armature release and contact agency reset,disconnect lines or terminate the interlock.Dc contactor (2) :the structure and working principle of dc contactor is basically the same as the ac contactor.On the structure and the electromagnetic mechanism,contact system single phase asynchronous motorand arc extinguishing device and other parts.Due to the dc arc than ac arc is difficult to extinguish,dc contactor magnetic blow type arc extinguishing device is often used to arcing.