If the gearbox is left for too long, it is easy to get damp. What should we do if the gearbox gets damp? Today, the editor will give you some tips!
1. External heat source heating method
For motors of damp reducers, they should be disassembled and inspected first, and then high-power incandescent bulbs should be placed inside the reducer for baking, or the reducer should be placed in a drying room for drying. This method is easy to operate. But only suitable for small gearboxes that are easy to disassemble and inspect. For large and medium-sized reducers or reducers that are difficult to disassemble and inspect, the workload can be significant, which also reduces their feasibility. If using external heat source heating method, the light bulb or heat source should not be too close to the coil during operation to prevent burning out the coil.
2. Drying method for welding machine
① Before operating the drying method of the AC welding machine, connect the six terminals of the damp reducer winding in series to achieve heating and drying of the three sets of windings. To monitor the current changes during the drying process, connect an ammeter in series and observe whether its current reaches 60-70% of the rated current of the reducer motor. The reducer is dried using an AC welding machine, and the reducer motor does not need to be disassembled and inspected, reducing the workload. At the same time, when powered on, the reducer motor uses its own resistance to heat up, making the coil evenly heated, and the drying effect is relatively good. However, this method is only suitable for reducer motors below 100kW and cannot be used for a long time because the current applied to the transformer of the AC welding machine is large during operation, and cannot be used for a long time, otherwise it may burn out the welding machine.
② The operation wiring of the drying method for DC welding machine is similar to that of AC, and the ammeter connected should be a DC ammeter. It is convenient to use a DC welding machine to dry damp reduction motors, and it can also dry large and medium-sized reduction motors and high-voltage reduction motors for a long time. When the welding machine works for a long time or with high current, its internal components will not be damaged due to long-term high current operation, so it can be used for a long time for large and medium-sized reduction motors. It should be noted that when using these two methods for drying, all contact points must be in good contact and tightened. The lead wire of the welding machine should use a dedicated wire, and the cross-sectional size should meet the current carrying capacity of the welding machine's output current. Pay attention to the cooling of the transformer of the welding machine itself, and ensure that the insulation resistance of the deceleration motor is not less than 0.1M Ω. Also, closely monitor the temperature of the deceleration motor winding.
3. Drying method for excitation coil
The excitation coil drying method involves winding an excitation coil around the iron core of the stator coil of a deceleration motor, and applying alternating current to generate magnetic flux in the stator, relying on iron loss to dry the stator of the deceleration motor. When using this method, it should be noted that the current in the excitation coil should not exceed the current carrying capacity of the wire, and the temperature rise of the stator coil should also be monitored to ensure that it does not exceed the maximum value allowed by the manufacturer. If you want to improve the drying speed, you can increase the input voltage of the excitation coil appropriately. It is worth noting that this method is suitable for large reduction motors with high power and difficult to move on site, but a leakage protection device should be used when energizing the excitation coil.
That's all for this issue. The above explanation about the solution to moisture in the gearbox has been provided. If you encounter this problem during normal use, you can refer to it.
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