Electromotor breakdown case study and processing technique
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source:LENA CNC Machining
1) , voltage is too low make electromotor cannot start to be in when electromotor put through when cannot starting after three-phase power source, its are likely the reason has: (The regulation of 1) electromotor receives a law to should be a triangle (△ ) join, but wrong however receive Cheng Xing form (Y) and what its take load the distance between heavier;(2) power source and electromotor is excessively long-distance and lead is meticulous, cause the power source tension that when starting, brings to bear on to be carried at electromotor the circuit itself voltage of power supply source of too low;(3) is too low. The case that to because voltage is too low,making electromotor cannot start, the following measure can adopt to give respectively after checking via detecting processing: (1) can receive the fault the form that it is a star (Y) receives a law to correct for the triangle the;(2) that receive a standard shortens as far as possible line length mixes power supply source to increase lead appropriately the output tension that sectional;(3) heightens side of transformer low pressure appropriately according to actual condition. The electromotor after 2) receives electrify source has buzz only, but phenomenon of this kind of breakdown cannot appear when normal starting electromotor starts however, its are likely the reason has: (1) three-phase power source did not put through entirely the laden Agricultural Machinery and Implement that;(2) is pulled to move, because of breakdown card lives not to move;(3) stator winding fault of termination of derivative line beginning and end or winding interior wiring are received to turn over, winding of winding of stator of the;(4) that receive a fault or rotor has;(5) of one photograph open circuit to decide rotor chamfer number to cooperate undeserved (normally. When be like electromotor to start a process to produce afore-mentioned situations in its, after checking via detecting, handle to disease respectively: (Each pairs of contact of derivative to power supply cord, electromotor line, fuse, switch undertake 1) microscope, after the position that finds out open circuit breakdown gives the classics of end of derivative line beginning and end that eliminates;(2) to examine place to procrastinate to the laden Agricultural Machinery and Implement that move blocks immobile consideration and try to handle;(3) to receive a fault detects, give correct;(4) to decide, Europe of usable avometer, million expresses the open circuit breakdown of rotor winding, give new link can;(5) is decided, rotor chamfer number cooperates undeserved when, can adopt rotor external diameter proper vehicle the stator winding span with small or fit choice, and change the measure such as new rotor additionally to give reasonable solution definitely. 3) electromotor starts difficulty, the turn up after the rated load on the belt does not start difficulty to electromotor of rated rotate speed, the reason has the possibility that the turn up after the rated load on the belt is less than rated rotate speed: (The power of inflexible demand crosses 1) load big or main transfer machinery is lived not to move;(2) overload protection to equipment is chosen and adjust undeserved;(3) by card in exterior circuit or stator winding the existence in having winding of winding of stator of;(4) of one photograph open circuit or rotor has winding of stator of electromotor of short circuit;(5) inside, pine of wiring of winding of the rotor that wind a string takes off the bearing attaint of;(7) electromotor. Appear when start when electromotor afore-mentioned breakdown circumstances, can press the following method to handle respectively: (1) checks whether the power of laden machinery and electromotor is chosen in detail match proper, should choose otherwise relatively the electromotor of high capacity or if main transfer machinery is blocked,reduce laden; , should find out a reason to give choose and adjust what if protect facility because of overload,eliminate;(2) undeserved, can increase its to if overload protects follow on action,rectify the; that decide a value appropriately, because electromotor capacity is chosen too smally,the likelihood is, can change right now appropriate electromotor or reduce place to pull the laden;(3) that move to be able to use million Europe watch or avometer to wait to open circuit breakdown detect place of affirmatory open circuit, when inspecting breakdown circumstance take into consideration the circumstances to if be individual coil short circuit,handle;(4) stator or rotor winding, can adopt local repaired method repair. When if range of winding short circuit is big breakdown is serious, must tear open change the coil that burn caustic or all rewind;(5) if when termination of beginning and end of electromotor winding interior is wrong, should ravel electromotor carries a lid, the low-pressure direct current source that controls 6V is ordinal receive each photograph to circle inter block, chase photograph examination with compass law in order to find out breakdown, what press a regulation next is correct receive a law to correct wrong wiring of;(6) basket rotor break or sealing off the weight degree that should inspect breakdown, adopt filling solder respectively or change the method processing; of new rotor is like electromotor bearing to already damaged truly via the examination, should change the new bearing that is the same as model. Circle the breakdown that wiring of line rotor winding loosens, can use the method such as resistor of range estimation, quantity normally, give in order to find out breakdown filling solder can. This kind of breakdown appears when the fuse-element fusing electromotor of switch of knife of the brake when 4) electromotor starts starts, its are likely the reason has: (1) electromotor is short of photograph starting;(2) to start control switch to come the jumper between electromotor already power of electromotor of short circuit;(3) passes small or place pulls the orgnaization that moves load to block;(4) fuse-element sectional be chosen too finely or already was damaged ground connection of winding of;(5) electromotor stator or;(6) of existence short circuit circle line rotor. If start when electromotor appears afore-mentioned circumstances, can use undermentioned method processing respectively: (1) microscope power supply cord, electromotor is derivative line, fuse, switch each contact, find out a holiday to receive or give repair;(2) checks the switch insulation to electromotor jumper after open circuit breakdown, find out short circuit dot to wrap up afresh reduce electromotor in order to eliminate breakdown;(3) what to pull the load that move or eliminate what to pull the breakdown;(4) that moves laden orgnaization to choose fuse-element to answer appropriately with can be opposite short circuit and overload start a protective action to be accurate, and should not ask fuse-element removes protective action;(5) to be opposite to electromotor overload ground connection of electromotor stator winding or short circuit breakdown, watch of watch of usable million Europe, high-pressured testing stand or avometer, bridge and short circuit scout implement etc undertake detecting, the exact position that finds out breakdown grants repair;(6) checks seriously the starting resistance of electromotor of the rotor that wind a string, if value is too little should increase resistance and eliminate short circuit. 5, the electromotor when starting is unusually calorific when starting with fumy electromotor unusually calorific the breakdown with fume, its are likely the reason has: (Voltage of 1) power source is too low, cause electromotor to produce tension of exorbitant power source of temperature rise;(2) below rated load exorbitant, stator core magnetism falls in order to call motive in rated load close exorbitant, make electromotor temperature rise exorbitant thereby;(3) electromotor starts often or, invert the frequency is overmuch, powerful starting electric current makes winding produces motor of high temperature;(4) ventilated and undesirable or the temperature of working environment is exorbitant;(5) stator winding has little scope short circuit or ground connection trouble, after starting, cause local and calorific or electromotor is fumy;(6) basket rotor is broken or wiring of winding of the rotor that wind a string loosens, below rated load rotor gives out heat and make the temperature rise of electromotor exorbitant serious overload or place pull;(7) electromotor use laden machine lubricant and undesirable, cause whole electromotor calorific;(8) electromotor carries a lid to be out of shape or bearing damages, make calm, rotor is brushed badly and give out heat. If electromotor arises for above reason when normal and calorific or blame is fumy, can use undermentioned method processing respectively: (1) should detect above all electromotor sky carries and the voltage when load, if carry voltage for nothing too low the output tension that should increase its transformer appropriately. If be the voltage drop when load too big, should trade the level that uses thicker power supply cord to set in order to if power source voltage is exceeded,reduce;(2) of circuit voltage drop, the output voltage that should move transformer of low power supply is opposite with reducing;(3) of voltage of power supply circuitry appropriately start often or, invert the electromotor with much time, can reduce its to start with, invert frequency, perhaps change can suit to start often reach, inverting electromotor;(4) electromotor is ventilated when undesirable or environmental temperature is exorbitant, whether does the fan that should check electromotor damage reach its to secure a state, clear seriously the ventilated path of electromotor jams in case. After giving the high temperature heat source near electromotor the local short circuit that keeps apart;(5) stator winding or ground connection breakdown can find out breakdown position with appearance at the same time, inspect the take into consideration the circumstances such as its breakdown limits, serious degree to handle;(6) to be opposite basket model of rotor break a breakdown to be able to receive electromotor inferior voltage (be rated voltage about 15% , on the three-phase alternating current source of 30%) , measure its stator electric current at the same time, if basket model rotor winding has or sealing off breakdown, criterion as rotor position different its stator electric current also can produce corresponding change. In find basket model of rotor winding break or sealing off after the position, can inspect a circumstance to make filling solder or the processing that change new rotor again. When wiring of the rotor that wind a string loosens, usable ohmmeter, avometer undertakes detecting, find out wiring to loosen to be in new wiring to grant to tighten solid can;(7) is decided to electromotor, the breakdown that rotor photograph brushs, if the lid is out of shape or by end runner shaft curves what what cause to should undertake,machine corrective, if be bearing,attaint should change new bearing. CNC Milling