Maintenance of 22 Micos and  22D Micos

Maintenance of 22 Micos and 22D Micos

Minh Phu Machinery and Engineering Services Co., Ltd specializes in supplying spare parts and repairing, maintaining screw compressors, Piston compressors. For Micos series, Minh Phu serves full spare parts with high quality and competitive price. Please contact us at 0919 232 826 for more details and free technical advices.

Installation and Piping of GRH3 air compressor

Installation and Piping of GRH3 air compressor

Electric wiring and Power Facilities of GRH3 air compressor

Electric wiring and Power Facilities of GRH3 air compressor

Swan TS-V air compressor

Swan TS-V airr compressor series is a series of machines using inverter to reduce power consumption and have outstanding features of the Swan TS series. Based on operating phenomena to optimize operation, ensure maximum air volume and minimum power consumption, average electricity savings at: 15% - 30%. Protection and advanced control system improved reliability of safe and enhanced operating performance; Air compressor starts at zero speed, extending the machine's durability.
Hitachi air compressor maintenance

Hitachi air compressor maintenance

Minh Phu Machinery and Technical Services Co., Ltd specializes in repair, maintenance and supply of parts for Hitachi air compressors with high quality, reliability and long-term warranty. Please call Minh Phu 0919232826 for more details. Belows are some pictures of repair and maintenance Hitachi air compressors.

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

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