What is the motor drying temperature?
1, oven drying temperature
The oven drying temperature is generally 110-120 degrees, and the holding time is debugged according to your motor size and quantity, the size of the oven.
2, the temperature of the winding dried
The thermometer, temperature indicator, or by resistance are buried in the motor to determine the temperature. The highest allowable temperature of the hottest of the winding at the time of drying
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Typically, in the drying start phase, the insulation resistance will fall, and the drying process can be concluded after the insulation resistance value is greater than the predetermined value and stabilizes for 3 hours.
Method for drying electric motor
1, circulating hot air drying method
Make a dry chamber with heat insulating materials (such as with a refractory brickwork), there is a ventilation in the upper surface, and the side is ventilated. The venting air port is connected to the heating chamber, and the 220V electric furnace wire in 3 kW is provided in the heating chamber (the heating chamber can also be heated with other methods). The heating chamber can be made of iron, and the heating chamber is blown into the drying chamber with a hairdryer to dry the motor windings. The dry chamber hot air temperature is controlled around 100 ° C.
2, current drying method
The voltage of 7% to 15% of the motor rated voltage is applied to the stator windings with a three-phase regulator, or the electric welder, the single-phase adjuster to block 20% to 40% voltage of the motor rated voltage is added to each other. On the three-phase windings connected in series, the current is controlled at about 60% of the rated current of the motor, so that the winding is heated to dryness. When drying, you must pay close attention to the winding temperature, adjust the voltage, current in time.
3, bulb drying method
Put one or several high-power incandescent bulbs (such as 100W) into the motor chamber for drying. Note: The bulb cannot be too close to the coil to prevent the burnout coil. The canvas can be held on the motor casing.
4, infrared bulb drying method
With a wooden box or iron box, there is an air hole and a thermometer jack. In-box device infrared light, infrared lamp power is configured in volume of 4 ~ 5kW / m3 box, so that the infrared lamp is allowed to dry, change the number of lamp bubbles or light bulb power variable box temperature.
Steps to dry the motor
(1) Select the impregnation painted in the first as required.
(2) Pre-bake
The pre-bake is to drive the moisture in the windings, and it is also easy to dip after pre-baking. Generally, the temperature of the electric motor pre-bake is 20 ~ 30 / h, which is conducive to moisture. Pre-baking, the insulation resistance of the outer casing is measured at a 500V or 1000V megapherus table every 1 h. When the insulation resistance reaches the specified requirements and stabilizes, the dipping is performed.
(3) Take the paint
When the predecessor is cooled to 60 ° C to 70 ° C, it can be immersed. The temperature is too high, the paint is not easy to be soaked; the temperature is too low, and the windings are easily suction moisture. When you immers, you should be screwed to avoid the paint sealing risers, and the motor is not immersed in the lacquer.
After the immersion paint is completed, the motor should be left around 30 min, drip dry lacquer, and then dry treatment. Sometimes it is necessary to make multiple immersing treatment for windings (such as 3 to 4 times of wet tropical motors).
(4) Dry treatment
The purpose of drying is to volatize the solvent and moisture in the paint, so that the winding surface forms a rugged film. Drying at a low temperature of 70 ° C to 80 ° C for 2 to 4 h drying at a temperature of from 70 ° C to 80 ° C, a temperature of 110 "° C to 120 ° C was dried after 2 to 4 hours. During drying, the insulation resistance of the outer casing is measured every 1h until it tends to be stable, and then stopped after 3 h. At this time, the insulation resistance should not be less than 5mΩ, otherwise it will continue to dry.
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Dry motor precautions
(1) When drying is treated, it is necessary to keep the insulation and there is a vent hole to exclude moisture.
(2) When performing power-on drying, in order to be safe, the motor housing should protect the ground (zero), or use a hull protection. When the insulation resistor is measured, it should be done after cutting the power.
(3) Drying temperature and drying time should comply with process requirements.
(4) During the drying process, the winding temperature and the insulation resistance of the outer casing should be measured periodically, and record it. Record once every 15 minutes every time, record once every hour. Read more
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