Reasons why high-efficiency and energy-saving motors are burned out

During the use of high-efficiency and energy-saving motors, it is inevitable that leakage and burning will occur due to improper operation and other reasons. Regarding the leakage problem of high-efficiency and energy-saving motors, we have introduced in detail the solutions to the problem, so the high-efficiency and energy-saving motors are What are the reasons for burning? And how to avoid this failure? Let’s discuss it together below!

When a high-efficiency and energy-saving motor suffers from phase loss, the motor usually cannot start. Even if it can start without load, it will make a buzzing sound as the speed increases, the motor will smoke and heat, and then it will burn. the taste of. After removing the end cover of the motor, we can clearly see that 1/3 or 2/3 of the polar phase windings at the end of the winding are zoomed or dark brown.

The reasons why high-efficiency and energy-saving motors are burned are roughly as follows:

Poor contact between the motor power supply circuit and the fuse circuit, or mechanical damage may cause the fuse to blow out; the three-phase fuses in the motor power supply circuit have different specifications, so fuses with small capacities are prone to blowing out. The fuse should be selected according to the power of the motor. To choose the appropriate fuse; the contacts of various switches and contactors such as isolating switches and rubber cover switches in the motor power supply circuit are burned or loose, which can easily to phase loss in high-efficiency and energy-saving motors, so they should be repaired in time. And adjust the moving and static contacts, and ensure good contact; if the line is broken, phase loss will also occur. At this time, we should find out the broken line and make a firm connection; false welding between the motor winding wires s to poor contact and lack of phase. Phase, at this time we should carefully check the motor winding connecting wire and weld it firmly.

If an energy-saving motor operates in a high pressure area for a long time, this will cause the motor shaft power to increase, causing the motor's current to exceed the rated value, causing overload, and all three sets of windings of the motor to be burned out. , when a high-efficiency and energy-saving motor operates in a high-pressure area for a long time, the pressure should be properly relieved, or a motor with appropriate power should be replaced.

If there are foreign objects in the high-efficiency and energy-saving motor, causing the motor to be overloaded, or the motor bearings are not lubricated, the sand frame is damaged, and the stator and rotor cores are in friction, these will cause all three sets of windings of the motor to be burned. In order to prevent the high-efficiency and energy-saving motor from inhaling foreign matter, we should take appropriate measures to deal with the foreign matter at its front end to ensure that it rotates flexibly.

There is no lubricating grease in the bearing, dry grinding or mechanical non-concentricity of the rotor, etc., which will to friction between the stator and rotor cores. The consequence is that the current exceeds the rated value, causing all three sets of windings of the motor to be burned. Therefore, we should regularly Check the wear and lubrication of the bearings, clean them in time, and inject appropriate lubricating grease. If the bearings are severely worn, replace them with new ones; if the rotor is not concentric, it may be that the center hole of the end cover is seriously worn, and we should replace it at this time End caps.

In addition to the above reasons, unstable power supply voltage can also cause the motor to be burned. Therefore, when the power supply voltage is unstable, we should install a three-phase power supply voltage stabilizing and compensation cabinet. If the motor works in a humid environment for a long time, or is corroded by corrosive gases around it, its own insulation resistance will also decrease, and the motor will be burned. Therefore, high-efficiency and energy-saving motors must be in a dry environment, and there must be no corrosion around them. sexual gas.