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Planetary reducer placed too long after damp how to do?
Time：2020-05-24
In the actual production of the chemical enterprise, often find some machine of decelerate of planet of place for a period of time not to use, when enabled again found deceleration motor winding insulation resistance is reduced, especially in the rainy season, the air humidity is big, its insulation value decreases to zero, even at this time should be dry processing, so that the insulation resistance, absorption ratio specified value, if the first put into operation, It is possible to make the planetary reducer coil insulation breakdown, causing an accident.
In the actual production of the chemical enterprise, often find some mechanical and electrical machine of decelerate of planet of placing unused for a period of time, when enabled again found deceleration motor winding insulation resistance is reduced, especially in the rainy season, the air humidity is big, its insulation value decreases to zero, even at this time should be dry processing, so that the insulation resistance, absorption ratio specified value, if the first put into operation, It is possible to break down the insulation of the motor coil, causing an accident. The following are several simple reducer motor drying method:
1, external heat source heating method
For damp deceleration motor will be removed after the first inspection, with a high-power incandescent bulb into the deceleration motor for baking, or the gear motor into the drying room for drying. This method is convenient and reliable, but it is only suitable for small deceleration motor which is easy to disassemble and inspect. For large and medium-sized or not easy to dismantle the speed reducer motor relatively large workload, but also reduce the feasibility. It should be noted that the bulb or heat source should not be too close to the coil when this method is operated to prevent the coil from being burned out. The shell of the reducer motor can be covered with canvas and other items for heat preservation.
2, welding machine drying method
Before 2.1, ac arc welder drying operation will be affected with damp be affected with damp in six of the gear motor winding wire 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 reached 60% ~ 70% reduction motor rated current. The drying reducer motor of AC welding machine does not need to disassemble and check the reducer motor, which reduces the workload. At the same time, the reducer motor uses its own resistance to heat up under the condition of power on, so that the coil is heated evenly, and the drying effect is better. But this method is only applicable to the reducer motor below 100KW, and it can not be used for a long time. Because the AC welding machine working in the transformer current of the welding machine is large, can not be used for a long time, otherwise it may burn out the welding machine.
2.2 The operation wiring of DC welding machine's drying method is similar to that of AC, and the serial ammeter shall be DC ammeter. It is convenient to use DC welding machine to dry damp reducer motor, and can dry large and medium sized reducer motor and high pressure reducer motor for a long time. In this way, when the welding machine works for a long time or with a large current, its internal parts will not be damaged due to a long time of large current work, so it can be used for a long time of large and medium-sized electric deceleration. It is worth noting that when using these two methods of drying, all contacts are required to be in good contact and fastened. The welding machine lead wire should be used for special wires, and the required cross-section size should meet the capacity of the output current of the welding machine. Pay attention to the cooling of the transformer of the welding machine itself, and ensure that the insulation resistance value of the reducer motor is not less than 0.1m Ω. Also pay close attention to the deceleration motor winding temperature, timely adjustment of voltage and current.
3. Excitation coil drying method
The excitation coil drying method is to wind the excitation coil on the iron core of the stator coil of the reducer motor, and pass into the alternating current to make the stator produce magnetic flux, and rely on its iron loss to dry the reducer motor stator.
When using this method, attention should be paid to the current in the excitation coil should not exceed the carrying current of the wire, and the temperature rise of the stator coil should be monitored to make it not exceed the maximum value allowed by the manufacturer. If you want to increase the drying speed, the input voltage of the excitation coil can be increased appropriately (the number of turns of the excitation coil should be doubled). It is worth noting that this method is suitable for large reducer motor with large power and is not easy to move in the field, but leakage protection machine should be used when energizing the excitation coil. At the same time, the excitation coil should be selected to meet the requirement of good insulation performance when the stator temperature of the reducer motor rises.
When the planetary reducer is wet and dry, no matter what method is used to dry, it should be to ensure that the personnel and reducer motor as the premise, which requires that in the process of processing at any time to pay attention to the temperature and insulation resistance of the planetary reducer winding and core, to ensure that the temperature does not exceed the allowable value and do a good job of recording.
In the actual production of the chemical enterprise, often find some mechanical and electrical machine of decelerate of planet of placing unused for a period of time, when enabled again found deceleration motor winding insulation resistance is reduced, especially in the rainy season, the air humidity is big, its insulation value decreases to zero, even at this time should be dry processing, so that the insulation resistance, absorption ratio specified value, if the first put into operation, It is possible to break down the insulation of the motor coil, causing an accident. The following are several simple reducer motor drying method:
1, external heat source heating method
For damp deceleration motor will be removed after the first inspection, with a high-power incandescent bulb into the deceleration motor for baking, or the gear motor into the drying room for drying. This method is convenient and reliable, but it is only suitable for small deceleration motor which is easy to disassemble and inspect. For large and medium-sized or not easy to dismantle the speed reducer motor relatively large workload, but also reduce the feasibility. It should be noted that the bulb or heat source should not be too close to the coil when this method is operated to prevent the coil from being burned out. The shell of the reducer motor can be covered with canvas and other items for heat preservation.
2, welding machine drying method
Before 2.1, ac arc welder drying operation will be affected with damp be affected with damp in six of the gear motor winding wire 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 reached 60% ~ 70% reduction motor rated current. The drying reducer motor of AC welding machine does not need to disassemble and check the reducer motor, which reduces the workload. At the same time, the reducer motor uses its own resistance to heat up under the condition of power on, so that the coil is heated evenly, and the drying effect is better. But this method is only applicable to the reducer motor below 100KW, and it can not be used for a long time. Because the AC welding machine working in the transformer current of the welding machine is large, can not be used for a long time, otherwise it may burn out the welding machine.
2.2 The operation wiring of DC welding machine's drying method is similar to that of AC, and the serial ammeter shall be DC ammeter. It is convenient to use DC welding machine to dry damp reducer motor, and can dry large and medium sized reducer motor and high pressure reducer motor for a long time. In this way, when the welding machine works for a long time or with a large current, its internal parts will not be damaged due to a long time of large current work, so it can be used for a long time of large and medium-sized electric deceleration. It is worth noting that when using these two methods of drying, all contacts are required to be in good contact and fastened. The welding machine lead wire should be used for special wires, and the required cross-section size should meet the capacity of the output current of the welding machine. Pay attention to the cooling of the transformer of the welding machine itself, and ensure that the insulation resistance value of the reducer motor is not less than 0.1m Ω. Also pay close attention to the deceleration motor winding temperature, timely adjustment of voltage and current.
3. Excitation coil drying method
The excitation coil drying method is to wind the excitation coil on the iron core of the stator coil of the reducer motor, and pass into the alternating current to make the stator produce magnetic flux, and rely on its iron loss to dry the reducer motor stator.
When using this method, attention should be paid to the current in the excitation coil should not exceed the carrying current of the wire, and the temperature rise of the stator coil should be monitored to make it not exceed the maximum value allowed by the manufacturer. If you want to increase the drying speed, the input voltage of the excitation coil can be increased appropriately (the number of turns of the excitation coil should be doubled). It is worth noting that this method is suitable for large reducer motor with large power and is not easy to move in the field, but leakage protection machine should be used when energizing the excitation coil. At the same time, the excitation coil should be selected to meet the requirement of good insulation performance when the stator temperature of the reducer motor rises.
When the planetary reducer is wet and dry, no matter what method is used to dry, it should be to ensure that the personnel and reducer motor as the premise, which requires that in the process of processing at any time to pay attention to the temperature and insulation resistance of the planetary reducer winding and core, to ensure that the temperature does not exceed the allowable value and do a good job of recording.
