1. The problem of the inverter and the motor itself
If the motor has been used for a long time, it is not good to clean the insulation function, or the bearing may be 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 the vector parameters are contrary to the matching of the motor, 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 there will be attenuation and waveform distortion.
In some occasions where rapid braking is required, it is necessary to purchase appropriate braking resistors and braking units and other accessories according to the braking power.
2. Long-term operation and low frequency
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 such use, mainly in the case of low frequency, the waveform is severely distorted, and the sine wave is too far away, the motor operation function is poor, and the torque is severe attenuation and heating. This can be achieved by increasing the transmission ratio and then increasing the output frequency of the inverter.
If you must work for a long time in a low-frequency situation, 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 devices in the controller with air conditioning, so that the temperature of the inverter is in the best 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, it is necessary to summarize the torque and power required by the load, and then select the appropriate motor power and torque.
In the same way, if the standard of the inverter is also small, the inverter will be heated for a long time higher than the rated current, and will soon present a problem to burn off the selection of small, can only replace the larger model to deal with, this is a rigid requirement of things, and there is no shortcut, must be dealt with in a timely manner, even if you dismantle the existing as a second-hand sale is better than continue to use, what is the problem but delays the production, Maybe some explosions or fire accidents due to fever and other problems, that's big work.
Some loads, although not heavy, involve frequent start-ups and stops, which also require increased power to be used, otherwise 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 organization or the bearing is broken, then the resistance becomes larger, the output of the motor will also become larger, some situations are severe, may show the motor stall phenomenon, 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 critical situations, perhaps the protection parameters of the inverter are not set, the same will form abnormal phenomena such as heating. In this case, 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.
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