在《What are the common problems of air compressor？(一)》In this article, Xiaobian introduces some small problems that air compressors often encounterAtlas BolletThe small series will finish the common motor "minor faults"。

What are the reasons for the motor three-phase current imbalance？

Three-phase voltage unbalance;Motor internal phase branch welding or poor contact;Motor winding interturn short circuit or to the ground, interphase short circuit;Wiring error。

Why can't a 60Hz motor be connected to a 50Hz power supply？

In the design of the motor, the silicon steel sheet generally works in the saturation area of the magnetization curve。When the power supply voltage is certain, the decrease in frequency will increase the magnetic flux and excitation current, resulting in an increase in the motor current, an increase in copper consumption, and eventually an increase in the motor temperature。In severe cases, the motor may burn out due to overheating of the coils。

What is the cause of motor phase loss?

Power supply: poor switch contact;Transformer or broken line;The insurance fuse has blown。

Motor: motor junction box screw loose contact is poor;Internal wiring welding is poor;The winding of the motor is broken。

What causes the motor to produce abnormal vibration and sound？

Mechanical: bearing lubrication is poor, bearing wear;Fastening screws loose;There's debris in the motor。

Electromagnetic: motor overload operation;Three phase current unbalance;Stage missing;The stator and rotor windings are short-circuited.The welding part of the cage rotor adopts open welding and break welding。

What do I need to do before starting the motor？

Measure insulation resistance (not less than 0 for low-voltage motors).5MΩ)；

Measuring supply voltage。Check whether the motor wiring is correct and the power supply voltage meets the requirements；

Check whether the starting equipment is in good condition；

Check the fit of the fuse；

Check whether the motor is grounded and connected to zero；

Check the transmission for defects；

Check whether the motor environment is suitable, remove flammable materials and other debris。

What are the causes of overheating of motor bearings？

The motor itself;

Bearing inner and outer rings are too tight;

There are problems in the shape and position tolerance of the parts, such as the coaxiality of the frame, end cover, shaft and other parts is not good;

Improper bearing selection;

Bearing lubrication is poor or bearing cleaning is not clean, there is debris in the oil;

Aspects of use:

The unit is improperly installed, such as the coaxiality of the motor shaft and the device is dragged;

The pulley is pulled too tight:

Bearings are not well maintained, grease is insufficient or exceeds the service life, dry deterioration。

What is the reason for the low insulation resistance of the motor？

Winding damp or water;Dust or oil accumulated on the winding;Insulation aging;Motor lead or terminal board insulation failure。

Above isAtlas BolletThe relevant content of the air compressor saw collected by Xiaobian, if you have other questions about the air compressor, you can directly contact our online customer service for relevant consultation。