Dc speed-down electric captain time need not, again enabled will find gear motor winding insulation resistance is reduced, especially in the rainy season, the air humidity is big, its insulation value even down to zero, then it should be on the dry processing, so that the insulation resistance, absorption than e., reaching the following to introduce several kinds of drying methods:
1. Welding machine drying method
1, ac arc welder drying before operation will be affected with damp be affected with damp reduction motor winding connection head together, chassis ground, so it can dry heating, three sets of winding for monitoring current changes in the process of drying, string into an ammeter, observe whether the current is to slow down the motor rated current. Dc gear motor with ac arc welder is dry without overhaul, reduce the workload, at the same time under the condition of the electric gear motor with its own resistance heating, make the coil uniform heat, drying effect is better.
2. The operation wiring and communication of the dc welder's drying method are similar. The current meter shall be dc ammeter. It is easy to operate with dc welder, and can be used for long drying of large and medium speed reducers and high pressure reducers. In this way, the internal components of the welding machine won't cause damage due to long hours of current work, so it can be used in the time of the large and medium speed reducer. It is important to note that when using these two methods dry requires all contacts must be well connected and fastening, electric welding machine, lead wire with a special wire requirements section size should meet the carrying capacity of electric welding machine output current. Note that welding transformer cooling, at the same time, to ensure that no reduction motor insulation resistance is lower than 0.1 M Ω. Also pay close attention to decelerating motor winding temperature adjust voltage current timely.
Second, external heat source heating method
In the case of the dampness dc deceleration motor, after disassembly, a large power incandescent bulb is put into the decelerator motor to bake it, or the decelerating motor is put into the drying room for drying. This method is easy to operate and safe and reliable, but it is only suitable for small speed reducer motors that are easy to disassembly. For large and medium sized or not easy to remove the deceleration motor is relatively heavy workload, but also reduces the feasibility. It should be noted that the bulb or heat source should not be too close to the coil when the method is operated, so as to prevent the coil from being burnt, which can be used for the insulation of the canvas and other items on the motor housing.
Three, excitation coil drying 
The excitation coil dry - drying method is to coil the excitation coil on the iron core of the motor stator coil, and pass into the alternating current, causing the stator to generate the magnetic flux and rely on its iron loss to dry the motor stator