(1) The motor has large power, large working current and large heat generation.

(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 amount of wind generated is small.

(4) The motor is attached with dust and oil, which reduces the heat dissipation capability.

(5) The bus voltage of the vacuum pump motor is 380V. Due to the cable voltage drop and uneven load distribution, the actual voltage applied by the motor is only 365V. The low voltage causes the operating current to be large.

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. Although increasing the number of fan blades can play a certain role, but after the number of blades increases, the dynamic balance is not easy to find. If the alignment is not good, the vibration of the motor will increase.

(1) Lengthen the original fan cover by 40cm, and install an axial fan with the same diameter as the fan cover. The axial fan motor power is 850W, the speed is 1489r/min, and the voltage is 380V. 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 flow fan is started in time, and the axial flow fan is stopped 30 minutes after the vacuum pump is stopped, so that the main motor is fully cooled;

(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 400V.

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