Many people have already discovered the damage of the inverter to the motor. For example, in a water pump factory, in the past two years, his users frequently reported that the pump was damaged during the warranty period. In the past, the quality of this pump factory was very reliable. After investigation, it was found that these damaged pumps were driven by inverters.
Although the phenomenon that the inverter damages the motor is getting more and more attention, people are still unclear about the mechanism that causes this phenomenon, and they do not know how to prevent it. The purpose of this article is to address these confusions.
Inverter damage to the motor
The damage of the inverter to the motor includes two aspects, the damage of the stator winding and the damage of the bearing, as shown in Figure 1. This kind of damage generally occurs in a few weeks to ten months, the specific time and the brand of the inverter, the brand of the motor, the power of the motor, the carrier frequency of the inverter, the cable length between the inverter and the motor, the ambient temperature, etc. Many factors are related. The early accidental damage of the motor brings huge economic losses to the production of the enterprise. This loss is not only the cost of motor repair and replacement, but also the economic loss caused by accidental shutdown. Therefore, when using a frequency converter to drive a motor, it is necessary to pay sufficient attention to the problem of motor damage.
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