The cause of the heating of the inverter of the special machine

1. Problems of the inverter and the motor itself;

After the motor has been used for a long time, it cannot be ruled out that the insulation function is not good, or the bearing is stuck, and it may show a large current and heat. The coupling between the motor and the load may also be worn, or the three-phase imbalance of the motor, the fixture of the motor is loose, etc., which will cause abnormal movement and heating.

Some components of the inverter are aging, or there may be deviations between the vector parameters and the motor matching, or the parameters such as torque increase are set too large, or the acceleration and deceleration time is too short, or the carrier frequency of the inverter is too small, which may cause the motor and the inverter to heat up together.

The connection line between the motor and the inverter should not be too long, otherwise attenuation and waveform distortion will occur.

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

The cause of the heating of the inverter of the special machine

The cause of the heating of the inverter of the special machine

2. Long-term operation of low-frequency conditions;

Generally, it is not suitable to plan the motor operation below 8HZ, even if it is a vector control inverter, it is necessary to try to prevent this use, mainly in the case of low frequency, the waveform is severely distorted, and the distance between the sine wave is too far, the motor operation function is poor, and the torque is severe attenuation and heating. The target can be achieved by increasing the gear ratio and then increasing the output frequency of the inverter.

If you must work in a low-frequency condition for a long time, you can use a special inverter motor, or maybe the motor is forced to be air-cooled or even water-cooled to cool down.

Optimize the operating environment:

In the past, the economic conditions were not good, many small factories did not plan an independent control room, even if there was a control room, there was no air conditioning for the control room, now the conditions are good, it is completely possible to use the inverter and other equipment in the controller with air conditioning, so that the temperature of the inverter is in a better condition, not easy to heat, and also due to the reduction of dust and so on to extend the service life, in detail, it is actually a better investment.

3. Pay attention to the correctness of selection;

The motor is the heart of the equipment and the power source for almost all loads. When planning the selection of equipment, the demand takes into account the torque and power of the load demand, so as to select the appropriate motor power and torque, if the capacity of the motor is small, it is equivalent to a small horse-drawn heavy car, of course, the motor itself is in an overload operation situation, and it will be severely heated.

In the same way, if the specifications of the inverter are also small, the inverter has been higher than the rated current for a long time, the same will be severely heated, and it will soon present a problem to burn off, the selection is small, and it can only be replaced with a larger type to deal with, this is a rigid requirement of things, and there is no shortcut, it must be dealt with in time, even if you dismantle the existing one as a second-hand sale is better than continue to use, after all, the problem delays production, Maybe some explosions due to fever and other problems, or maybe fire accidents, that's a big deal.

Although some loads do not seem to be heavy, they involve frequent start-ups and aborts, which also require amplified power to be used, otherwise they will face the same problems mentioned above.

4. Problems with equipment and load;

Mechanical equipment may be loaded, if there is any abnormality, such as the gear of the transmission mechanism or the bearing is broken, then the resistance becomes larger, the output of the motor will also become larger, some conditions are severe, or the motor stall phenomenon may be presented, the current will be very large, although most of the inverter will cause overload and overcurrent to cause alarm shutdown, but there are also some in a critical situation, perhaps the protection parameters of the inverter are not set, and the same will form abnormal phenomena such as heating. In this situation, of course, it is necessary to start from the mechanical equipment and load to solve the problem.

For example, the inverter controls some liquid transfer pumps or air supply fans, etc., due to problems such as dirty pipelines and bending, the current of the motor and inverter is too large due to the formation of resistance, which should be cleaned in time.

The cause of the heating of the inverter of the special machine

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