Squirrel-cage asynchronous motor soft starter application - soft starter start,stop,features

Total pressure for water pump type load,motor starter,water,will be in a very short period of time to full speed in case of pipe bend,high-speed flow impact on the pipe wall,make a big impact,the formation of water hammer effect,can damage piping.If the water pump in front of the line is longer,when sudden stop water pump motor,high speed water flow will impact to the pump impeller,produce very big impact,can make the impeller deformation or damage.Shandong plant no.1,no.2 water pump room,undertake the task motor magnet the seepage discharge of underground powerhouse.Water pump room 1 6 motor rated power is 110 kw,the rated current of 202.2 A;2 water pump room 3 motor rated power is 75 kW,rated current 140 A.In the operation of the pump in the problems are: 1,overhaul of deep well water pump room of no.generator generator set 1,due to stop when the pump water hammer is too big,the original cast iron check valve blowout,now although change slow close check valve,alleviate the water hammer effect,but the water hammer will damage to the motor brake non- return plate.


2 water pump room 2 low pressure pump,water hammer effect makes the pump impeller damage.In April 2005,shandong factory for no.1,no.2 water pump room 9 pump control system is reformed,change from the previous relay control system to the programmable controller to control.Water pump motor for direct starting before modification,and electricalmotor1.blogspot.com now with ABB PST the soft starter.Through to the soft starter motor Settings of various parameters get better starting performance.Booster time: 3 s,starting voltage: 60%,current limiting multiples: 4 ie.Motor starting,the starting voltage 60% Ue,when four times starting current to rated current,output electrical motor voltage stability,until reduced to limit the following current,boosting process will continue,ensure the starting current is always less than 4 times the rated current,as shown in figure 2.Pump shut down,the water hammer effect caused by noise,vibration,often appear non-return valve fracture,short service life of pump pipeline rupture of fault,even the most difficult problem in the water supply system is the damage when the pump stop water hammer,soft starter excellent soft stop function is fundamentally solve this problem.Through to the soft starter Settings of various parameters to make the pump to obtain better braking performance.Decompression time: a t1 t2 = 3 s,end voltage: 60% Ue.

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.

Brushless synchronous generator is how to generate electricity?

Three-phase brushless synchronous generator excitation system are connected by a coaxial communication issue of ac exciter,after rotating rectifier rectifier for direct current (dc), Then sent to the generator exciting winding.Ac exciter is rotating armature type of three-phase medium frequency generator,the diesel generators prices frequency of www.dongfeng-motor.com generator frequency three times Left electricalmotor1.blogspot.com and right sides,which can improve the perkins diesel generator setexcitation response speed.Exciting winding is stationary,controlled by the automatic voltage regulator AVR excitation.Rotating rectifier Have high reliability,using the three-phase half wave bridge rectifier and three-phase full-wave bridge rectifier,firmly fixed on the rotor,with the current measurement And fault indicating device.

The working principle of the vacuum contactor

Vacuum contactor with vacuum arcing acmotortrading.blogspot.com medium,ac motor electric 65kw its main contact seal in a special vacuum arcing tube.When operating coil electricity,armature,absorption in the contact spring and vacuum tube autistic force electric motors price under the action of contact closure;Operating power coil,the armature reaction spring overcome vacuum tube autistic force release,off contact.Contactor breaking current,the contact single phase asynchronous motor will form by the metal steam in the clearance.

Rotor winding interturn short circuit tester production steps

1,open test.According to their usual test objects,and decided to test the mouth (typically run backward trapezoidal) size.adopted here is that the diameter of 90 mm electric tools,stator core core thick stack size has no special requirements for test again best which the one zhang middle,size is 52 mm (top),25 mm (below).Can use first hand hacksaw saw as close to the size,then electric vehicle motor use electric Angle grinder or grinder precision grinding to a standard size.2,packet core insulation.Parts of the core is not open with the electrician layer 2 white cloth bandaging,taut,each lap halved bandage must be used.3,winding coil.Choose QZ type round copper enameled wire enameled wire,specifications for between 0.20~0.30,from core end to the other end of the core,close around 4000 laps,taut and rules,the beginning of the coil,the head with a soft thin wire leads.Again with the same specifications of enameled wire around an indicator light power coil alone,about 40,to power a light-emitting diodes (leds),as long as the turn-to-turn short circuit tester under current condition,has been light-emitting light-emitting diodes (leds),to remind timely repair personnel power,save electricity.4,coil insulation.To have good coil winding,layer 2,with a white cloth

bandaging requirements taut,each lap to adopt half fold around the wound.5,electricity test.Use coil on 220 v mains,screw whorls and other iron products www.facebook.com/guohong.trading in the test after mouth,look have electromagnetic suction,if use pen test to measure iron core leakage.Again electrify more than 8 h,with the hand when the power is touching the turn-to-turn short circuit tester coil temperature,looks a little heat is normal,such as the need to add around 500 ring motor fan coil overheating try again,until the current more than 8 h,with the hand when the power is touching the turn-to-turn short

circuit tester coil temperature,normal appearance is a little hot.6,dip coating and drying.According

to the motor stator winding varnished or press series motor stator winding varnished

requirement,using 1032 insulating paint,after dip coating and drying of rotor winding interturn short circuit tester,safer,more durable.

Phase ac motor capacitor after the start and use?

The rotation of the single phase ac motor principle Only a single phase ac motor winding,is squirrel cage rotor.When a single-phase sinusoidal current in the stator winding,the motor can produce an alternating magnetic field,The magnetic field strength and direction of interplanting sine law of change at any time,but on the spatial orientation is fixed,so the magnetic field is also called alternation pulse magnetic field.The pay Variable pulse magnetic field can be decomposed into two at the same speed and direction of rotation are instead of a rotating magnetic field,when the rotor static,the two two rotating magnetic field in the rotor An equal and opposite torque,making synthetic torque is zero,so the motor can't rotate.When we use the motor rotates in the direction of a force (clockwise),then the rotation of the rotor and clockwise direction magnetic field between the cutting lines of magnetic force movement decreases; Rotor and the spin counterclockwise direction Turn the cutting lines of magnetic force between field.This balance is broken,the total electromagnetic torque generated by the rotor will no longer be zero,the rotor will spin down driving direction Turn up.To make single-phase acmotortrading.blogspot.com electric function automatically spin,we can add a starter in the stator winding,starting with the main windings in space by 90 degrees,starting Winding to concatenate a suitable capacitance,makes differ with on the phase of wholesalemotor.blogspot.com the primary winding current approximate 90 degrees,the so-called split-phase principle.These two are on time 90 degrees of electricity flow into motor lamination the two differ 90 degrees of winding on the space,will be produced in the space (two-phase) rotating magnetic field,under the effect of the rotating magnetic field,the rotor is Can automatic starting,after the start,to speed up certain,with the aid of an installed on the rotor of the centrifugal switch or other automatic control device will start winding disconnect,The only main winding work in normal working conditions.Therefore,starting winding can make short work.But there are a lot of time,starting winding is not broken,we induction motor refer to this Single-phase motor,motor for capacitive's turn to change this motor,can be achieved by changing the position of the capacitor is concatenated.