Sung Shin - VSD air compressor

Sung Shin - VSD air compressor

Variable Frequency Driver (VFD) -reducing energy consumpsion system is produced with the required amount of air and compressor shutdown under no-load conditions. In order to minimize unnecessary energy loss through the inverter to adjust the number spin of compressor Energy consumption saving arises starting by reducing the starting current as the inverter is operated.
Kaeser BSD 72 - Germany Maintenance

Kaeser BSD 72 - Germany Maintenance

KAESER air compressor company was established in 1919 in Corbug - Germany, with over 90 years of experience, the company has developed a system of selling goods and services on a global scale, through representative offices and authorized agents. More than 5000 employees in over 100 different countries and territories, KAESER is considered one of the three most prestigious and successful pneumatic brands in Europe.
New Hiscrew Oil Next-Hiatchi air compressor

New Hiscrew Oil Next-Hiatchi air compressor

Hitachi compressor oil is produced by Hitachi - one of the Japanese industrial machine brand. Hitachi is a specialized compressor oil for Hitachi air compressor.

Swan air compresssor TS series

Swan air compressors TS series are designed to be compact and dedicated, highly durable, imported air end from Europe, fully-sealed motors, modularized air inlet system,user-friendly equipment panel easy to use.

Installation and Piping of GRH3 air compressor

Installation and Piping of GRH3 air compressor

The special cases of 3-phase asynchronous motors

Wednesday - 02/01/2019 03:39

The special symptoms of 3-phase asynchronous motors

dong co dien 1 pha,3-phase asynchronous motors
3-phase asynchronous motors

The unloading condition of the motor is  normal,  in this artcle some special cases are mentioned:

1. Unloading motor

Unload motor (spin without load) or very  weak load, weak currents in the motor that do not harm the engine, but waste resource, and low  capacity  factor and output, causing waste electrical energy . Therefore,  the motor had not better to be  worked  under load or unload .

2. Short-circuited case 

Short-circuited phenomena can be caused by: 

The insulating resistor of the motor is reduced (due to the damped engine) or due to a mechanical collision that damages the insulation, causing a short circuit among the phases, or the wires of a phase. , or phases. Also please note the following symptoms:

When you turn on, rotor can not spin, curent on the windings is very high , if  this symptoms is ignored in long time, motor will be broken. This is called short-circuited phenomena
Before operating motor, you should measure insulating resistor. To small or medium capacity motor, if insulating resistor is less than 0,5 M, you have to dry motor before operation. While operating , if motor is clogged or the load is too heavy, immediately disconnect power( if not the motor will be burnt).  

3. Working case with asymmetric voltage 

If the 3-phase voltage is installed in an unbalanced motor, in the motor outside the magnetic field (in the same direction as the rotor rotation), or in inverse magnetic field. The magnetic field that causes an inverse  torque to rotation direction reducing  the torque  motor, increasing the loss, electric currents   and the heat of motor. The working condition of asymmetric voltages that often occurs in production is the loss of an electric phase. If this situation is not corrected for a long time, the motor will be  burnt.


Minh Phu provides maintenance and repair services for air compressors, in addition Minh Phu also provides spare parts for air compressors with high quality at reasonable prices. For further information, please contact (+84)919 23 28 26. Sincerely thank you for your interest and your trust of our service. The special symptoms of 3-phase asynchronous motor

Total notes of this article: 0 in 0 rating

Click on stars to rate this article