First, the reason
1. The motor has large power, large working current and large heat.
2. The fan speed is low, the wind pressure and the air volume are small.
3. The number of fan blades is small, and the generated air volume is small.
4, the motor is attached with dust, oil, reducing the ability to dissipate heat.
5. The bus voltage of the vacuum pump motor is 380 V. Due to the cable voltage drop and uneven load distribution, the actual voltage applied by the motor is only 365 V. The low voltage causes the operating current to be large.
Second, the countermeasures
The motor power and speed are matched to the vacuum pump and cannot be changed. The fan is mounted on the motor spindle. The motor speed determines the fan speed and cannot be replaced. Increase fan
Although the number of blades can play a certain role, but after the number of blades increases, the dynamic balance is not easy to find. If the correction is not good, the vibration of the motor will increase.
1. Extend the original fan cover by 40 cm, and install an axial fan with the same diameter as the fan cover. The axial fan motor power is 850 W, the speed is 1 489 r/min, and the voltage is 380.
V. The original fan continues to be retained. The axial flow fan is additionally provided with one power supply control, and the axial flow fan is not interlocked with the main motor. After the vacuum pump is started, the axial fan is started in time, and the vacuum pump stops.
The axial flow fan is stopped 30 minutes after the operation to fully cool the main motor;
2. Regularly remove dust from the motor, keep the heat sink of the motor clean, and increase its heat dissipation capacity;
3. Adjust the bus voltage of the vacuum pump to 400 V.
Third, the effect
1. Due to the high speed of the axial fan, the wind pressure is large, and the cooling effect is greatly enhanced. Under the same ambient temperature and load current, the temperature of the main motor drops by 12 °C. The main motor temperature in summer is no longer exceeded.
2. The axial flow fan can be artificially controlled. After the main motor is out of service, the axial flow fan can still operate, which can fully cool the main motor.
3. Try to balance the load distribution of the two sections of the busbars to prevent the voltage drop of a certain busbar due to excessive load.
4. After the voltage is adjusted, the operating current of the vacuum pump is reduced to 210 A, and the heat generation is relatively reduced.
5. Slow down the insulation aging speed of the main motor and prolong its service life.
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