What should I do if the three-phase asynchronous motor of the air compressor is wet?
After the lunar calendar in April, the Jiangnan area will enter the rainy season. The rainfall will increase the air humidity. The air compressor users should not only pay attention to the moisture resistance of the whole machine. There are three-phase asynchronous motors in the machine. It is also necessary to pay attention to the maintenance of the motor and keep the motor dry. Then, in case the three-phase asynchronous motor is damp, what should the user do?
During the use of three-phase asynchronous motor, due to the selection of the motor and improper storage, maintenance, environment and other factors, moisture will enter the motor to form condensation or the motor directly enters the water, resulting in a decrease in the insulation resistance of the motor, affecting the normal use and safe operation of the motor. . Here, we mainly analyze and analyze the method of drying the squirrel-cage motor in the field under different conditions.
Small capacity three-phase asynchronous motor moisture treatment method
Drying method: The small-capacity asynchronous motor is easy to disassemble and disassemble. It can be dried or disassembled in the inspection room according to the on-site environment. Generally, the following two methods can be used to dry the motor. Generally, the small low-voltage asynchronous motor is suitable for external heating and drying of the motor. The operation is relatively simple; the principle is to use the radiation, convection and conduction of the external heat source to dry the motor during drying; generally divided into two methods:
Drying with a light bulb (or infrared bulb), oven, and drying with a hot air blower;
Do not use the bulb or iodine-tungsten lamp to dry too close to the coil to prevent the coil from being blown. Safety guards must be used. The temperature should not exceed 100 °C when using the oven.
Large and medium-sized three-phase asynchronous motor moisture treatment method
There are several drying methods:
First: current drying method
The basic principle of the current drying method is to pass a low-voltage current to the stator winding of the motor, the rotor is blocked, and the motor is dried by the temperature generated by the loss of the motor itself. When the dryer is dry, the stator and the rotor are simultaneously heated, and the drying speed is fast, generally used for capacity comparison. Large high and low voltage motors;
Note: Calculate the maximum current distributed by each phase winding of the stall current, and should not exceed 50%~60% of the original rated current. You can select the voltage level to dry.
Second: motor iron loss drying method
The basic principle of the iron loss drying method is to wind the excitation coil on the stator winding core of the motor, and to input alternating current, so that the stator core generates magnetic flux, and the temperature rise caused by the eddy current loss of the iron core is used to dry the motor.
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