In the oil pump room,three-phase asynchronous motor runs obvious vibration and noise is too big,bad pump shaft seal and drip,the phenomenon such as oil spills often occur.Analysis its reason,mainly by the motor shaft and pump shaft concentricity of installation and adjustment is not accurate,and the vibration in the operation of the motor and the bottom bolt looseness,caused by the motor shaft centerline offset.this Sample,motor and oil pump bearings will accelerate wear ac synchronous motor,even damage coupling or shaft of the motor and oil pump shaft.In modern industrial and agricultural production,national defense and transportation production areas of national economy,the application of the motor are widely,which can convert electrical energy into mechanical energy. But in actual production,the motor can damage caused by various reasons in the process of running or burned,and broken phase for protection circuit shall not be able to quickly cut off power supply when motor damage caused by the accident in production occupies a large proportion.According to relevant data,every year around the world need to be repaired by accident burned phase winding motor accounted for about 5% of the total installed motor sets about, And burned by phase motor in China accounts for over 70% of the amount of winding repair [1].Obviously,this will affect the production,have caused economic losses,visible,caused by the phase problem is quite serious,therefore necessary to asynchronous motor (especially the large and medium asynchronous motor) set up reliable phase failure protection device.
To prevent Y series three-phase asynchronous motor open phase running,now,the existing traditional phase failure protection circuit consists of relay,contactor,completely because of circuit complexity,large volume,low reliability,failed to form a complete set of common use in practice [2].How to reduce the occurrence of these problems,improve the efficiency of the motor,is a question
worthy of consideration,the author According to many wholesalemotor.blogspot.com years of practice and the related data,analyze the cause and the damage of the end phase and zero sequence voltage as a starting point,puts forward the comprehensive open phase protection scheme.1 motor open phase 1.1 the cause of a phase power grid disconnection weather (such as the strong winds,heavy rain,blizzard,etc.),outdoor input power supply. Therefore,in the maintenance should be regularly
check and adjust the motor shaft and pump shaft concentricity. We have learned,at present in the oil depot mainly stainless steel ruler and hacksaw blade coupling,rotating shaft coupling,the clearance between the centrifugal pump coupling between the cylindrical surface and observe the ruler whether change,by using dial indicator turns the clock on both ends of the coupling oscillation situation,such as the clock oscillation is very small,say two axis of the concentric,adjust the end.But,when the coupling in mechanical processing,the concentricity (cylindrical center and inner hole,shaft end of the motor and pump shaft end) can't be very accurate,at the same time,the outside edge of normal could not very straight,with the naked eye observation with the coupling of the cylindrical gap is about values.In addition,when measured with a dial indicator,as a result of the movement of magnetic base,the datum has been changed,plus the processing error,but it's really hard to alignment motor pump Shaft concentricity.In view of the above,the use of special tools to accurately adjust motor pump shaft concentricity and can prolong the life of the motor pump,guarantee the smooth completion of the charge,hair oil task.
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