The structure and working principle of electromagnetic ac contactor

Structure:(1) the contactor is mainly com posed of electromagnetic system,contact system,arc extinguishing system and other parts.(1) the electromagnetic system:electromagnetic system,including electromagnetic coil and core is an important component of the contactor,rely on it to drive the contact closing and opening.electric fan motor (2) contact system:contact with the executive branch of contactor,including main contact and auxiliary contact.The role of the main contact is switched on and off the main circuit,control a larger current,and the auxiliary contact is electric motor 12v 500w in the control circuit,in order to meet the requirements of various kinds of control mode.(3) arc extinguishing system:arc extinguishing device to ensure off contact circuit,the electric arc reliable quench,reduce arc of contact damage.In order to quickly extinguished disconnected arc,contactor usually equipped with arc extinguishing device,generally USES half a longitudinal seam sealing clay arcing cover,with a ac induction motor 110kw strong magnetic blast circuit.(4) other parts:the insulation shell,spring,short circuit ring,transmission mechanism,etc.


(2) working principle:when the electromagnetic coil is not energized the contactor,wholesalemotor.blogspot.com spring reaction force and bit core of gravity to keep main contact disconnected position.When the electromagnetic coil through control circuit on the control voltage (generally rated voltage),the electromagnetic force to overcome the spring inhale armature reaction to the static iron core,drive the main contact closure,processing circuit,auxiliary contacts with the action.

Electromagnetic speed regulating motor speed control method

By the cage mini electric motor motor electromagnetic speed control motor,electromagnetic slip clutch and dc excitation source (controller) of three single phase ac motor parts.Dc excitation power is small,usually by a single-phase half-wave or full wave thyristor rectifier,change the thyristor conduction Angle,can change the size of the field current.Electromagnetic slip clutch armature,poles and excitation windings of three parts.The armature and the latter is no mechanical contact,can free rotation.Armature and motor rotor coaxial connecting said active part,by the motor drive;Pole docking with the shaft coupling and load according to secondary wholesalemotor.blogspot.com part.When the armature and pole are static,such as passing a dc excitation winding,the surface will form several along the air gap circle on N,S alternating polarity magnetic pole,the magnetic flux through the armature.

When the armature motor rotates with drag,because of the relative movement between the armature and pole,thus make the armature induced eddy current,the eddy current and magnetic flux interact to produce torque,driving a pole rotor according to the same direction,but its speed constant is lower than the speed of 5kw permanent magnet generator the armature N1,this is a way of slip speed,change of slip clutch dc excitation current,you can change the clutch output torque and rotational speed.Electromagnetic speed regulating motor speed control features: device has the advantages of simple structure and control circuit,reliable operation and convenient maintenance;Control of motor speed smooth,stepless speed regulation;Without the harmonic of power grids affected;Speed loss and low efficiency.

Three-phase asynchronous motor rotor current and the stator current is increased or decreased?

Three-phase asynchronous motor in the power supply voltage must be,if the load resistance increases,will force the output of the electricalmotor1.blogspot.com motor torque increase,at this point,the rotor of the motor current and stator current how will increase

accordingly.Three-phase asynchronous motor in the power supply voltage must be,if the load resistance increases,will force the output of the motor torque increase,at this point,the rotor of the motor current and stator current how will increase accordingly.Three-phase three phase generator asynchronous motor running under the rated voltage,load increases,the resistance torque is increased,the speed will be reduced,but very small,so that the motor stator and rotor of frequency offset,the impedance of the system (inductance),three phase stator current,rotor induced current also increases accordingly.Of course the load increases load power is also increased.By reducing load increase,rotational motor fan speed,the motor rotor speed than the stator rotating magnetic field rotation speed increase.Slip,motor output torque increase,at a certain frequency and voltage.The rotor and stator of the motor current will increase.Current increase natural motor output power is bigger.

ML series aluminium housing single-phase two value capacitor asynchronous motors

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