In the actual production of machinery manufacturing enterprises, it is often found that some geared motors have not been used for a period of time. When they are used again, the insulation resistance of the geared motor windings is found to be reduced. Especially in the rainy season, the air humidity is high, and the insulation value may even change. If it is reduced to zero, it should be dried to make the insulation resistance and absorption ratio reach the specified value. If it is put into operation hastily, it may cause the insulation breakdown of the torque ac gear motors coil and cause an accident.

Like many mobile phones accidentally dropped into the water, the easy way to solve its dampness and water ingress is to dry it. Although drying is simple on the surface, it also requires a certain method for precision products such as geared motors. For the drying method, the first thing we think of is the heating treatment or the so-called grilling. Here we can summarize it as the external heat source heating method, but there will be some other more complicated methods. The geared motor will decelerate from the gear below. The motor drying method is complicated.

1. Drying method of DC welding machine
The operation wiring of the dry method of the direct current welding machine is similar to that of the alternating current, and the series ammeter should be a direct current ammeter. It is convenient to use a DC welding machine to dry the damp gear reduction motor, and it can also dry large and medium-sized gear reduction motors and high-voltage gear reduction motors for a long time. In this way, when the welding machine works for a long time or high current, its internal components will not be damaged due to long time high current work, so it can be used for a long time for large and medium-sized geared motors. It is worth noting that: when using this electric welding machine to dry, all contacts must be in good contact and fastened. The welding machine's lead wire must use a special wire, and the cross-section size should meet the current carrying capacity of the electric welding machine. Pay attention to the cooling of the transformer of the welding machine, and ensure that the insulation resistance of the geared motor cannot be lower than 0.1MQ. Also pay close attention to the winding temperature of the gear reducer motor, and adjust the voltage and current in time.

2. Drying method of AC welding machine
Before the operation of the AC welding machine drying method, connect the 6 terminals of the damp gear reducer motor windings in series, and the casing is grounded, so that the three sets of windings can be heated and dried. To monitor the current changes during the drying process, one can be connected in series. With only an ammeter, observe whether its current reaches 60% to 70% of the rated current of the gear reducer motor. Drying the gear reduction motor with an AC welding machine does not require disassembly and inspection of the gear reduction motor, which reduces the workload. At the same time, the gear reduction motor uses its own resistance to generate heat when it is energized, so that the coil is evenly heated, and the drying effect is better. The method is only suitable for geared motors below 100KW, and cannot be used for a long time, because the current applied to the welding machine transformer is relatively large when the AC welding machine is working, and it cannot be used for a long time, otherwise the welding machine may be burnt out.

3. Excitation coil drying method
The excitation coil drying method is to wind the excitation coil on the stator coil iron core of the gear reduction motor, and apply alternating current to make the stator generate magnetic flux, and rely on its iron loss to dry the gear reduction motor stator. When using this method, it should be noted that the current in the excitation coil cannot exceed the current carrying capacity of the wire. At the same time, the temperature rise of the stator coil should be monitored so that it does not exceed the maximum value allowed by the manufacturer. If you want to increase the drying speed, you can appropriately increase the input voltage of the excitation coil (the number of turns of the excitation coil should be increased by the same time). It is worth noting that this method is suitable for large-scale geared motors with high power and not easy to move on site, but a leakage protector should be used when the excitation coil is energized. At the same time, the selected excitation coil requires that the temperature of the geared motor stator rises. It can meet its good insulation performance when it is high.

4. External heat source heating method
For the damp geared motor, first disassemble it and inspect it, then put a high-power incandescent bulb into the geared motor to bake it, or put the geared motor in a drying room for drying. This method is easy to operate, safe and reliable, but it is only suitable for small geared motors that are easy to disassemble and inspect. For large and medium-sized or geared motors that are not easy to disassemble and inspect, the workload is relatively large, and the feasibility is also reduced. It should be noted that the light bulb or heat source should not be too close to the coil during the operation of this method to prevent the coil from being burnt out, and items such as canvas can be added to the gear reducer motor housing for heat preservation.

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