DC motor in the production process, it is often found that some geared motor placed for a period of time not used, and again when the geared motor winding insulation resistance is found to be reduced, especially in the rainy season, the air humidity, the insulation value will even be reduced to zero, at this time should be dry, so that the insulation resistance, absorption ratio to reach the specified value, if rashly put into operation, it is possible to make the geared motor coil insulation breakdown and cause accidents.
The following are three simple geared motor drying method.
1 external heat source heating method
For the damp geared motor first disassembly inspection, with a high-powered incandescent bulb into the geared motor internal baking, or the geared motor into the drying room. This method is easy to operate, safe and reliable, but only for small geared motors that can be easily disassembled and inspected. For large and medium-sized or not easy to disassemble and inspect the geared motor is relatively large workload, but also reduces the feasibility. It should be noted that this method of operation, the light bulb or heat source should not be too close to the coil to prevent burning the coil, can be covered with canvas and other items on the gear motor shell for insulation.
2 welding machine drying method
a, AC welding machine drying method
Before the operation of the damp reducer motor winding, a terminal in series, the shell grounding, so that the three groups of windings can be heated and dried, in order to monitor the current changes in the drying process, you can string an ammeter to observe whether the current reaches the rated current of the reducer motor. Drying gear motor with AC welding machine without disassembling the gear motor, reducing the workload, while the gear motor with its own resistance to heat in the case of power, so that the coil is evenly heated, the drying effect is better, but this method is only applicable to the following gear motor, and can not be used for a long time, because the AC welding machine work added to the welding machine transformer current is larger, can not be used for a long time, otherwise may burn the welding machine.
b, DC welding machine dry method
Operation wiring and AC similar, the string ammeter should be DC ammeter. DC welding machine dry moisture geared motor operation is convenient at the same time can be large and medium-sized geared motor, high-voltage geared motor for a long time dry. In this way, when the welding machine works for a long time or high current work, its internal components will not be damaged by long time high current work, so it can be used for a long time for medium and large size geared motor. It is worth noting that when drying with these two methods, all the joints must be in good contact and tightened, and the lead wire of the welding machine should be a special wire, and the required cross-section size should meet the current carrying capacity of the output of the welding machine. Pay attention to the cooling of the transformer of the welding machine itself, while ensuring that the insulation resistance of the reducer motor can not be lower than 0.1 MΩ. Also pay close attention to the temperature of the reducer motor winding to adjust the voltage and current in a timely manner.
3 excitation coil drying method
Excitation coil drying method that is wound on the stator coil core of the geared motor excitation coil, and pass into the alternating current, so that the stator produces magnetic flux, relying on its iron loss to dry the geared motor stator.
Post time: Nov-25-2022