Three-phase asynchronous motor fault maintenance

Journal wear is not big,can be in shaft neck on a layer of chrome plating,grinding to need size;Wear

is large,can be in shaft neck for surfacing welding on to the lathe cutting polishing;If the journal

wear too much,also on the shaft neck turning 2-3 mm,car a sleeve again,strike set on the neck,and

then turning to the required size.If bending is not big,but by the method of grinding optical axis

neck,slip ring repair;If bending more than 0.2 mm,can put in the press,the rotating shaft in bend

pressure correction,after correction of the surface of the shaft with lathe cutting polishing;If the

bending is too large,the new shaft electric vehicle motor are subject to change.Rolling bearing oil shortage,can hear the sound of the "bone bone";If heard discontinuous "terrier infarction",may be bearing rims rupture.Y series three-phase asynchronous motor bearing inner mixed with sand and other debris or bearing parts had mild wear,create a slight noise.The transverse crack depth of no more than three phase asynchronous motor shaft axis diameter does not exceed the 10% to 15%,the longitudinal crack of 10% longer axis,surfacing method remedies are available,and then finish turning to required size.If shaft crack in more serious,need to replace the new shaft.

Chassis and end cover if there is a crack should be welding repair.If meet the bearing bore clearance is too large,resulting in bearing end cover with too loose,generally available will punch bearing uniform with burr hole wall,then into the end cover of the bearing.For motor power is bigger,also can be used with or plating method,finally work out the

size of the bearing need.(set,rotor are made by insulating silicon steel sheet pile into each

other,is the magnetic circuit part of the motor.,the damage and deformation of the rotor iron core is

mainly due to acmotortrading.blogspot.com the following

aspects.(1) bearing excessive wear or bad assembly,and rotor rub,make the surface damage of the iron core,and cause a short circuit between silicon steel sheet,motor iron loss increase,make the motor temperature rise too high.Then apply smooth file tools such as deburring,eliminate short silicon steel sheet,clean up after coated with insulating paint,heating and drying.(2) when the demolition of the old winding force is too big,make the stolen slot askew and open outward.The application of needle nose pliers,wooden hammer tools such as finishing,to reset the tooth bad,bad and reset has a gap between silicon steel sheet to join green shell paper,veneer rigid insulation materials,etc.Due to reasons such as the surface corrosion of the iron core (3) because of be affected with damp be affected with damp.At this moment need sandpaper clean,clean up after coated with varnish.(4) around like a heat burning core producing bad or teeth.Can use chisel or scraper tools such as deposition

thing out clean,coated with insulating paint dry.(5) between motor fan the core and base combined with

loose,tighten the original positioning screw.If positioning screw failure,can stand on the drill

positioning hole and tapping,tighten the set screw.Rusty spot on the surface of the bearing surface

available 00 # sandpaper erase,and then into the gas cleaning;Or bearing have crack,inside and

outside the ring rupture or bearing excessive wear,a new bearing should be replaced.Replace new

bearing,bearing should choose the same as the original model.Ac motor shaft through the bearing support,was part of the heaviest load,it is easy to wear and tear parts.