Maintenance method for moisture of large and medium asynchronous motors: current drying method
2024-01-09 12:07:24
The principle of the current drying method is to pass a low-voltage current to the stator winding of the motor, the rotor is blocked, and the motor is dried by the temperature generated by the loss of the motor itself.
The principle of the current drying method is to pass a low-voltage current to the stator winding of the motor, the rotor is blocked, and the motor is dried by the temperature generated by the loss of the motor itself.
When it is dry, the motor stator and rotor heat at the same time, and the drying speed is fast. It is generally used for high and low voltage motors and large and medium asynchronous motors with large capacity.
The maximum current distributed by each phase winding of the locked current should not exceed 50%~60% of the original rated current, and the voltage level can be selected for drying.
Formula: I=U*Iq/UN
Where: U: voltage after falling; UN: rated voltage; Iq: starting current, generally 5 to 8 times of rated current.
The current drying method is divided into the following three methods:
1. The three-phase winding of the motor is connected in series at the beginning and the end (or a reverse string to reduce the current) for the motor of the six outlets.
1Using AC/DC welding machine or voltage regulator to regulate the current flowing into the stator winding of the motor to dry the motor, which is suitable for drying high and low voltage motors when the field power capacity is insufficient;
2 Turn on and off the electric welding machine "target=_blank> machine current should first adjust the current to zero to prevent high voltage damage to the motor insulation;
3 On-site processing does not need to extract the rotor of the motor, which is convenient.
2. The three-phase winding of the motor is connected in parallel (for the motor with 6 outlets) or two phases are connected in series and connected in parallel with the other phase (for 3 outlet motors); the AC current is regulated by AC/DC welding machine or voltage regulator. Motor stator windings to dry the motor.
3. Directly connect the low-voltage three-phase AC power to the stator winding of the motor without pulling out the rotor of the motor.
1 The motor stator and rotor are dry at the same time, which is convenient to implement on site. The large power supply capacity of the large motor is likely to be limited by the site conditions;
The 26kV motor is generally connected to the 380V power supply for drying. If the motor insulation is lower, the rotor can be used for drying.
3 If the motor insulation is greater than 0.5Ω, the three-phase AC can be turned on and the motor can be rotated to dry.
----- Editor-in-Chief: Dalan Oil Pump Motor 02-Procurement Consultant
Copyright http: / (Dalan Motor) Reprint, please indicate the source
Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
The principle of the current drying method is to pass a low-voltage current to the stator winding of the motor, the rotor is blocked, and the motor is dried by the temperature generated by the loss of the motor itself.
When it is dry, the motor stator and rotor heat at the same time, and the drying speed is fast. It is generally used for high and low voltage motors and large and medium asynchronous motors with large capacity.
The maximum current distributed by each phase winding of the locked current should not exceed 50%~60% of the original rated current, and the voltage level can be selected for drying.
Formula: I=U*Iq/UN
Where: U: voltage after falling; UN: rated voltage; Iq: starting current, generally 5 to 8 times of rated current.
The current drying method is divided into the following three methods:
1. The three-phase winding of the motor is connected in series at the beginning and the end (or a reverse string to reduce the current) for the motor of the six outlets.
1Using AC/DC welding machine or voltage regulator to regulate the current flowing into the stator winding of the motor to dry the motor, which is suitable for drying high and low voltage motors when the field power capacity is insufficient;
2 Turn on and off the electric welding machine "target=_blank> machine current should first adjust the current to zero to prevent high voltage damage to the motor insulation;
3 On-site processing does not need to extract the rotor of the motor, which is convenient.
2. The three-phase winding of the motor is connected in parallel (for the motor with 6 outlets) or two phases are connected in series and connected in parallel with the other phase (for 3 outlet motors); the AC current is regulated by AC/DC welding machine or voltage regulator. Motor stator windings to dry the motor.
3. Directly connect the low-voltage three-phase AC power to the stator winding of the motor without pulling out the rotor of the motor.
1 The motor stator and rotor are dry at the same time, which is convenient to implement on site. The large power supply capacity of the large motor is likely to be limited by the site conditions;
The 26kV motor is generally connected to the 380V power supply for drying. If the motor insulation is lower, the rotor can be used for drying.
3 If the motor insulation is greater than 0.5Ω, the three-phase AC can be turned on and the motor can be rotated to dry.
----- Editor-in-Chief: Dalan Oil Pump Motor 02-Procurement Consultant
Copyright http: / (Dalan Motor) Reprint, please indicate the source
Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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