What causes the variable frequency drive to heat up?

When the variable frequency drive is working, the current flowing through the variable frequency drive is very large, and the heat generated by the variable frequency drive is also very large. Below, I will introduce to you the two main reasons and solutions for the heating of the variable frequency drive of the special machine:

1. The problem of the variable frequency drive and the motor itself;

If the motor has been used for a long time, it is not ruled out that the insulation performance is not good, or the bearing is stuck, which may generate a large current and generate heat. The connecting shaft between the motor and the load may also be worn, or the three phases of the motor are unbalanced, the fixing device of the motor is loose, etc., which will cause abnormal noise and heat.

Some components of the variable frequency drive are aging, or there is a deviation between the vector parameters and the motor matching, or the parameter settings such as torque boost are too large, or the acceleration and deceleration time is too short, and the carrier frequency of the variable frequency drive is too small, which may cause the motor and the variable frequency drive to heat up together. .

Generally, the connection line between the motor and the variable frequency drive should not be too long, otherwise attenuation and waveform distortion will occur. If you want to use it, you should also use a dedicated variable frequency drive and add a reactor to handle it.

In some occasions where fast braking is required, it is necessary to purchase suitable braking resistors and braking units and other accessories according to the braking power.

2. Long-term work in low frequency state;

It is generally not suitable to design the motor to work below 8HZ. Even vector control variable frequency drives should be avoided as much as possible. Mainly in the low frequency state, the waveform is seriously distorted, and the gap is too far from the sine wave, the motor performance is poor, and the torque is severely attenuated. fever. The goal can be achieved by increasing the gear ratio and then increasing the output frequency of the variable frequency drive.

What are the reasons for the heating of the variable frequency drive of the special machine and how to solve it?
If you must work in a low frequency state for a long time, you can use a dedicated variable frequency motor, or force the motor to cool down by air cooling or even water cooling.

Optimize the use environment:

In the past, the economic conditions were not good, and many small factories did not design independent control rooms. Even if there were control rooms, they did not install air conditioners in the control rooms. Now that the conditions are good, it is possible to install variable frequency drives and other components in the controllers with air conditioners. In this way, the temperature of the variable frequency drive is in a better state, it is not easy to generate heat, and the service life is extended due to the reduction of dust, etc. After careful calculation, it is actually a better investment.

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