Inventory of drying methods for DC geared motors after being damp

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  When the DC geared motor is not used for a long time, it will be found that the insulation resistance of the geared motor winding will decrease when it is used repeatedly.Especially in the rainy season, when the air humidity is high, the insulation value may even drop to zero.At this time, it should be dry to make the insulation resistance and absorption rate reach the specified value.Here are some drying methods for everyone.Come and take a look.
  XNUMX. Drying method of electric welding machine
  1. Before the drying operation of the AC welding machine, connect the damp terminals of the motor windings in series with the chassis to ground, so that the three sets of windings are heated and dried.In order to monitor the current change during the drying process, an ammeter can be connected in series to observe whether the current reaches the rated current of the geared motor. Using an AC welding machine to dry the DC geared motor does not require disassembly and inspection, which reduces the workload.At the same time, the motor will use its own resistance to heat when energized, so that the coil is heated evenly and the drying effect is better.
  2. The dry work wiring of DC welding machine is similar to AC, and the series ammeter should be a DC ammeter.It is convenient to use a DC welder to dry wet geared motors, and can dry large and medium-sized DC geared motors and high-voltage geared motors for a long time.In this way, when the welding machine works for a long time or with a high current, its internal components will not be damaged by a long time and a large current. Therefore, when it can be used for a long-term large and medium-sized geared motor, pay attention to these two methods. When drying, all contacts are required The contact is good and tight, the outlet of the welding machine should use a special wire, and the cross-sectional size should meet the current-carrying capacity of the output current of the welding machine.Pay attention to the cooling of the transformer of the electric welding machine, and ensure that the insulation resistance of the DC geared motor cannot be lower than 0.1M.Pay close attention to the winding temperature of the geared motor, and adjust the voltage and current in time.
  XNUMX. External heat source heating method
  For the wet geared motor, first disassemble and inspect, and then put it into the geared motor, and bake it with a high-power incandescent bulb or put the geared motor in a drying room for drying.This method is simple to operate and reliable, but it is only suitable for small geared motors and is easy to disassemble and inspect.But for large and medium-sized 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 during the operation of this method, the bulb or heat source should not be too close to the coil to prevent the coil from burning out.The geared motor housing can be covered with canvas and other insulation items.
  XNUMX. Excitation coil drying method

  The excitation coil drying method is to wind the excitation coil on the stator core of the DC geared motor, introduce alternating current to make the stator produce magnetic flux, and rely on its iron loss to dry the geared motor stator.

DC geared motor

  Through the content explained in this article, we can roughly understand the drying method of the DC geared motor after being damp, which can be applied in actual operation.I hope that the content explained in this article will help you and bring you practical significance.
Editor: Lynn
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